Accepted Manuscript Title: Polysaccharides Templates for Assembly of Nanosilver Author: Hossam. E. Emam Hanan B. Ahmed PII: DOI: Reference:
S0144-8617(15)00843-7 http://dx.doi.org/doi:10.1016/j.carbpol.2015.08.095 CARP 10298
To appear in: Received date: Revised date: Accepted date:
19-7-2015 19-8-2015 30-8-2015
Please cite this article as: Emam, Hm. E., and Ahmed, H. B.,Polysaccharides Templates for Assembly of Nanosilver, Carbohydrate Polymers (2015), http://dx.doi.org/10.1016/j.carbpol.2015.08.095 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
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Polysaccharides Templates for Assembly of Nanosilver Hossam. E. Emam 1, ∗, Hanan B. Ahmed 2
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Textile Research Division, National Research Centre, Dokki, Cairo 12311, Egypt
Chemistry Department, Faculty of Science, Helwan University, Ain-Helwan, Cairo
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11795, Egypt
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Corresponding author Tel.: +20 201008002487
E-mail address:
[email protected] (Hossam E. Emam).
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Abstract
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Polysaccharides are particularly attractive in biomedical applications due to its
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biodegradability and biocompatibility. In addition to its ecofriendly effects and easy
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processing into different hydrogel shapes, made polysaccharides used on a large scale
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as suitable media for preparation of silver nanoparticles (AgNPs). In spite of, most of
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polysaccharides are water insoluble, but, it has shown to be quite efficient capping
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agents and/or nanoreactor matrices for production of AgNPs. Several methods have
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been developed to get the benefit of multi-functionality for polysaccharides'
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macromolecules in preparation of AgNPs. Therefore, recently, preparation of
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nanosilver using different polysaccharides have been the focus of an exponentially
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increasing number of works devoted to develop nanocomposites by blending AgNPs
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with different polysaccharides matrices. The current review represents a wide survey
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for the published studies which interested in using of polysaccharides in nanosilver
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preparations.
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Keywords: Polysaccharides, AgNPs, Stabilizing agent, Reducer, Templates.
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I. Introduction
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Noble metal nanoparticles are characterized by unique electronic, optical,
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mechanical, magnetic and chemical properties rather than the bulk materials becomes
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recently the subject of focused research in the last decade. These unique properties are
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attributed to large volume to surface area ratio which leads manifold applications in
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solar energy conversion, catalysis, medicine and water treatment for instance
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(Hutchinson, 2008; Kamat, 2002; Li et al., 2001). 1
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Generation of metal nanoparticles includes three main stages, namely the
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reduction reaction of metal ions to free atoms, nucleation and growth. Recent studies
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showed that, the reaction kinetics and experimental conditions play important roles
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for the nucleation and growth stages. Reduction of metal salt precursors to the
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elemental metal nanoparticles plays a crucial role, and generally requires a reducing
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agent and a stabilizer one, in order to obtain shape and size controlled metal
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nanoparticles (MNPs). Therefore, all of afore mentioned methods in the literatures
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used for synthesis of nanometals become an attractive field for research in order to
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transform the sized controllable nanoparticles potential applications to reality (Knoll
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and Keilmann, 1999; Sengupta et al., 2005; Wiley et al., 2007).
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A fact has been achieved that the size, morphology, despersibility, and
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physicochemical properties of the metal NPs are strongly affected by the experimental
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conditions, reaction kinetics between metal ions with reducer, and stabilizer
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(Sengupta et al., 2005). Some commonly used chemical reductants for preparation of
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nanosilver are borohydride, ascorbate, hydrazine, and elemental hydrogen (Shirtcliffe
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et al., 1999; Nickel et al., 2000; Chou and Ren, 2000; Evanoff et al., 2004; Sondi et
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al., 2003; Merga et al., 2007; Ahmadi et al., 1996). Some of the commonly used
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methods for surface protection of MNPs are self-assembled monolayers, as the most
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popular is citrate and thiol-functionalized organic substrates (Ullman, 1996),
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encapsulation in H2O pools of reverse microemulsions (Petit, 1993) and dispersion in
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polymeric matrixes (Zahran et al., 2014a; Zahran et al., 2014b; Hebeish et al., 2010).
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Polysaccharides, due to their ability for chelating different metal ions it could
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act as stabilizing agents. The polymer-metal ion complex can then be reduced under
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different experimental conditions, to produce MNPs with small size and narrow size
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distribution. Additionally, polysaccharides could also be characterized by good
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reducibility, as its building blocks contain different functional groups and thus can
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play the dual roles of NPs generators and protecting agents. This dual function of the
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polysaccharide can be an advantage in the green and cost effective syntheses of MNPs
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since it avoids the usage of harmful and toxic chemicals which limited the use of
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MNPs for biological or medical applications.
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Silver Nanoparticles (AgNPs)
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Different metal nanoparticles (i.e., Ag, Au, Pd, Pt, Rh, Ir, etc.) with diameter
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more than 10 nm are characterized by high stability due to their chemical inertness,
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however, when the size decreased to 2-4, they become easily oxidized in air. Different
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metal nanoparticles could be physically, biologically or chemically prepared in
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suitable solvent, in the presence of protective/capping/stabilizing agent such like
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polymers, surfactants or strong coordination ligands.
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Controlling the factors which influence shape and size of nanoparticles is of
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empirical significance to modulate the catalytic, optical and/or biological properties of
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the manufactured nanometals. Generally, there are two different ways for
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morphological controlling of precious nanoparticles :(i) template-directed preparation,
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in which metal ions are reduced and nanoparticles grow within the template,
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therefore, the shape and sizes of the so-obtained nanoparticles are controlled by the
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morphological properties of the template; (ii) growth-directed preparation, in which,
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shape-selective nanometals are prepared by using suitable metal precursor, reducing
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agent, protecting agent and controlling reaction kinetics.
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Silver materials are any silver- containing materials with special activities due
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to their nano-sized characters. Also Nano-silver referred to commercial products
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which contain metallic silver in size range of 5-50 nm or ionic silver with special
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medical applications (Panyala et al. 2008).
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An impressive number of methods for synthesizing AgNPs have been described
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in literatures, as generally AgNPs could be applicable in different medical purposes
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(medical textiles, cosmetics, pharmaceutical products, etc…….) or in other industrial
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applications (electronics, catalysis, etc…...). A new concept referred to green
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synthesis of AgNPs has recently been introduced, where the used reactants and
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solvents are described as non-toxic and benign compounds to the environment, and
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the so-obtained nanosilver colloids could be applicable in different biological
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purposes (Emam et al., 2015; Zahran et al., 2014a; Zahran et al., 2014b; El-Rafie et
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al., 2014; Hebeish et al., 2010). The chemical reduction of silver salts is one of the
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most widespread methods used for the synthesis of silver nanoparticles. In this way,
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the metal salts are dissociated to metal ions, and then reduced by a reducer to form
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metal nanoparticles that are stabilized by suitable capping agent.
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Great numbers of reducing agents include salts such as sodium borohydride
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(Guoping et al., 2012) or sodium citrate (Harriman et al., 1987) and gases such as
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carbon monoxide and hydrogen (Ershov and Abkhalimov, 2007) have been studied in
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literatures. Silver nanoparticles with high surface energy and high surface are tuned to
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aggregate or agglomerate. Recently, preparation of stable AgNPs is accomplished
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using protective coordinates, which provide electrostatic and/or steric protection like
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polymers and surfactants (Zahran et al., 2014a; Zahran et al., 2014b, El-Rafie et al.,
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2014). Also, stabilization of nanoparticles through immobilization is another
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demonstrated stabilization way (White et al., 2010).
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The stability of the particles depends on the method in which the stabilizers are
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anchored to the manufactured nanoparticles. According to the nature of capping agent
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used, stabilization anchorage proceeds through three main mechanisms: (i) steric
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stabilization due to the presence of bulky groups, (ii) electrostatic stabilization, which
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arises from electrostatic attraction between opposing charges, or (iii) stabilization by
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ligands (organo-metallic or covalent bonds) (Castonguay and Kakkar, 2010; Richter et
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al., 2009; Scott et al., 2005).
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II. Polysaccharides mediated for AgNPs
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Silver salts are historically known as antimicrobial agent, and recently, it has
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been reported that, silver nanocrystals is distinguished by its excellent antimicrobial
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action rather than ionic form (Emam et al., 2014a). Besides, silver has been used for
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ages in wound treatment. Recently, upcoming resistances of pathogens against
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antibiotics (especially in medical care) led to an increase of silver incorporation into
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medical matrices and nowadays a variety of applications are in different local and
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international markets.
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In the view of the large numbers of available natural polymers, this review has
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focused on the usage of polysaccharides derived from natural sources, i.e. polymeric
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carbohydrate structures that have been intensely investigated in the context of medical
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applications. Recent years have witnessed the implementation of AgNPs using
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polysaccharides as biodegradable and biocompatible polymers that directly emerge in
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biocidal materials. Such polymers in solutions are considered as hydrogels and can be
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described as effective capping agents for AgNPs. Polysaccharides have been used as
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composite matrices due to several characteristics of relevance for biological and
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medical applications, namely: biocompatibility, bifunctionility, sensitivity to external
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stimuli. In addition to their ability for coordinating with metal ions, polysaccharides
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could be used as reducers and capping agents for preparation of AgNPs. The polymer-metal ion complex can be reduced under controllable experimental
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conditions, resulting in small sized nanoparticles. Once metal ions reduced to produce
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nano-sized species; polysaccharide building blocks will impair nanoparticles clotting
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(Fig. 1). So, the net produced matrix can be designed to perform different functions,
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depending on the properties of the loaded inorganic nanoparticles and, on the other
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hand, this product can be easily adapted to bio-systems due to their potential
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biocompatibility
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polyfunctional compounds, as it includes different functional groups, so, they can
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serve as a springboard for the creation of multimodal and multifunctional systems
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through the addition of reactive and bioactive groups.
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contain hydroxyl groups and a hemi-acetal reducing end that are capable of reducing
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precursor salts. The oxidation of polysaccharides hydroxyl groups to carbonyl groups
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plays an important role in the reduction of metal salts (Mata et al., 2009). Others
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contain amino reducing end groups, capable of complexing and stabilizing metallic
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nanoparticles (Nadkarni et al., 1994). Carbohydrates with such amino groups bind
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tightly to the surface of the AgNPs providing them with hydrophilic surfaces (Kemp
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et al., 2009a). Monitoring the change in reducing end groups provides an excellent
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way of measuring the exact amount of polysaccharides which acts in reducing and
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complexing metal ions. High alkalinity results in polysaccharides depolymerization,
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alkaline hydrolysis, and/or oxidizing destruction (Nadezhda et al., 2012), producing
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fragments with high reducibility. Thus, recent researches were interested in using
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polysaccharides for synthesis of AgNPs under alkaline conditions. Therefore this
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review summarizes the employment of different polysaccharides in synthesizing of
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AgNPs. As a final note, the challenging field comprising the green manufacturing of
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AgNPs using polysaccharides will be put in perspective.
low-toxicity.
Polysaccharides
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Some of polysaccharides
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Figure 1: Schematic diagram presented the action of polysaccharides as reducing and stabilizing agent for silver nanoparticles.
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Reduction step
Stabilization step
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Heparin, Schizophyllan and Hyaluronic acid (HA) Silver-heparin
nanocomposites
have
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manufactured
using
2,6-
diaminopyridinyl heparin (DAPHP), which acts as both reducer and protecting agent
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(Kemp et al., 2009a; Kemp et al., 2009b). The reducing end of heparin was
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chemically modified by 2,6-diaminopyridine (DAP) to give DAPHP, envisaging its
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application as chelating and stabilizing for AgNPs. A narrow size distribution of
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particles was observed for Ag-DAPHP nanoparticles, due to the stable coordination
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between di-amino-pyridine moieties of DAPHP and NPs. Preparation of silver-
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heparin nanocomposites using chemical/thermal reduction method has been carried
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out. Both of size and morphological shape of the manufactured nanocomposites is
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affected by the concentration of heparin and metal salt, as increment in the
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concentration of either heparin or silver salt resulted in enlarged nanoclusters.
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Additionally, the surface plasmon resonance (SPR) band was red-shifted with
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increasing concentrations of heparin and silver salt.
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Solutions of high-molecular-weight HA with its biological compatibility and
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rheological properties are useful in different medical purposes (Doughty and Glavin,
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2009). HA is incorporated in synthesis of NPs amining to increase their
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biocompatibility. HA was used for synthesizing of AgNPs through chemical/thermal
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procedure, and the manufactured nanocomposites exhibited size average of 5-30 nm,
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where HA acted as both of reducing and stabilizing agent (Kemp et al., 2009b). These
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Ag-HA nanocomposites showed higher size distribution than that of Ag-DAPHP
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nanoparticles. Abdel-Mohsen et al illustrated that alkali treated HA fiber could be
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successfully applied in green preparation of AgNPs, using wet-spinning technique
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(Abdel-Mohsen et al., 2012b). As alkali treatment of HA fibers aid in solubilization,
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formation of transparent solution of the so-called fiber, and increment of
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reactivity/accessibility of functional groups for the solubilized units, which in turn,
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played the dual role of reducer and chelating/capping agent. Abdel-Mohsen et al. also
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offered a green method for AgNPs formation in alkaline medium by using triple
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helical schizophyllan (SPG) which is found out to be a reducing and stabilizing agent
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for NPs (Abdel-Mohsen et al., 2014).
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Chitosan Carboxymethyl chitosan (CMCs) was evaluated as a template for synthesis of
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Ag nanoparticles (Laudenslager et al., 2008). However, lacking of free amines in
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CMCs led to poor crosslinking and a limited chelating ability, which makes CMCs a
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poor choice as a reactor for synthesis of NPs. The same group studied the
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enhancement of nanoparticles stability using chitosan, by binding to AgNPs through
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the amino group (Wei et al., 2008).
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structure of Ag-chitosan nanocomposites is influenced by the reaction temperature
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(Potara et al., 2009). A dendritic Ag-chitosan film was prepared by mixing chitosan
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with Ag salts under acidic conditions (Wei et al., 2009; Sathishkumar et al., 2009).
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While Ag-chitosan film was synthesized by a photochemical reduction of silver ions
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in acidic medium and chitosan was used as chelating agent for AgNPs (Thomas et al.,
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2009).
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Controlling the size, shape and crystalline
Polymers which contain NH2-groups like chitosan is tightly coordinated with
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metal ions, however, medium and high molecular weight chitosan is soluble in acidic
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solutions, this property has been explored in some of difficulties in preparation of
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narrow sized/ well dispersed AgNPs (Cheng et al., 2005; Long et al., 2007).
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Therefore, it would be preferable to use a water-soluble derivative of chitosan for
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preparing of stable AgNPs. Recently, sulfated derivatives of chitosan, with
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anticoagulant activity as well as hemo-compatibility, have significant importance
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regarding to the application and use of this polysaccharide in medical devices (Fasl et
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al., 2010). Imparting of antimicrobial properties to anticoagulant materials has been
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achieved by encapsulation of AgNPs in sulfated derivatives of chitosan (Kong et al.,
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2010; Kulterer et al., 2012; Fasl et al., 2012). It was reported by Breitwieser et al.
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that, AgNPs encapsulated by 6-O-chitosan sulfate is considered as anticoagulant and
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hemo-compatible polysaccharide (Breitwieser et al., 2013a). S-Chi moiety with its
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negative charge is resulting in particles stabilization through electrostatic interaction
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or by covalent bonding.
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Breitwieser et al. also represented an environmentally friendly manufacturing of
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silver-cellulose fibers nanocomposites using conventional and microwave assisted
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heating (Breitwieser et al., 2013b). The Ag nanocomposites fibers are prepared by in
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situ process where silver ions were reduced by the action of S-Chi, as S-Chi is in close
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spatial proximity to the fiber where adsorption takes place. Controllable experimental 8
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conditions for both of microwave and conventional heating procedures induced no
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size and structural changes in nano-silver when the two heating methods were
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compared. Abdel-Mohsen et al was reported that, silver/chitosan-O-methoxy
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polyethylene glycol (chitosan-O-MPEG) core shell nanoparticles with different
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degree of substitution were successfully manufactured (Abdel-Mohsen et al., 2012a).
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As N-phthaloyl chitosan was reacted with polyethylene glycol monomethyl ether
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iodide in the presence of silver oxide (Kibeche et al., 2015; Ishihara et al., 2015).
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Experimental results showed that the so-produced Ag core particles exhibited size of
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18 ± 2 nm.
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Cellulose and its Derivatives
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Cellulose with economic advantages of abundance, low cost, biodegradability,
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and biocompatibility, is one of the most commonly polysaccharides employed in
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preparation of NPs. So, using of cellulose (soluble or insoluble form) in synthesis of
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AgNPs has received a considerable interest, where, reducing alcoholic and/or
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aldehydic groups are acting in reduction and stabilization of silver ions
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(Tummalapalli et al., 2015). Chemical modification and derivatization of cellulose
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aims to improving its solubility, rendering them more applicable in synthesis of silver
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nanocolloids (Table 1).
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Cai et al. used an aqueous alkali hydroxide-urea system to obtain transparent
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nano-porous cellulose gels, followed by immersing in AgNO3 solution as precursor
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salt for generating AgNPs (Cai et al., 2009). Francis et al., used hydroxy-propyl
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cellulose (HPC) as capping agent for AgNPs and ethylene glycol was used as solvent
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(Francis et al., 2010). Recently, HPC was investigated to be a reducer and stabilizer
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for AgNPs concurrently by Abdel-Halim et al. and Hussain et al. (Abdel-Halim et al.,
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2011; Hussain et al., 2015), as enlarged AgNPs was obtained, compared to that of
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Francis et al. Carboxymethyl cellulose (CMC) prepared by Hebeish et al. using slurry
247
method, was used as reducer and stabilizer for AgNPs. Size and structural features of
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the so-prepared AgNPs was strongly dependant on the degree of polymerization and
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degree of substitution for CMC. Higher concentration of well dispersed AgNPs (1000
250
ppm) with average size of 10–25 nm was obtained (Hebeish et al., 2010). More
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recent, hydroxyethyl cellulose (HEC) and hydroxypropyl carboxymethyl cellulose
252
(HPCMC) was prepared for manufacturing of AgNPs by El-Sheikh et al. and Abdel-
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Halim et al., respectively. HEC produced stable AgNPs, which was exposed to be 9
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stored for six months at room temperature (El-Sheikh et al., 2013). HPCMC afforded
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AgNPs similar in size to that obtained by CMC. Enlarged AgNPs (11-60 nm) was
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produced by HEC compared to that produced by CMC and HPCMC. According to the studies of Emam et al., insoluble cellulose was used for
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preparation of AgNPs by immersion of different cellulosic fibers in the silver salt
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solution (Emam et al., 2013; Emam et al., 2014; Emam and El-Bisi 2014; Emam et
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al., 2015a). AgNPs with very high size distribution (25-300 nm) were formed on the
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surface of Lyocell and Viscose fibers in an acidic medium at 30 °C (Emam et al.,
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2013). As an alkaline medium acted in swelling, catalyzing, increasing reducibility
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and activating the functional groups on the cellulose building units, resulting in
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smaller sized spherical AgNPs (Emam et al., 2014; Emam and El-Bisi 2014; Emam et
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al., 2015a). In situ deposition of AgNPs into different cellulosic fibers was performed
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at 70 °C for producing new functional fibers (Emam et al., 2014, Emam et al., 2015a),
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as AgNPs with size distribution of 0-160 nm was deposited on cotton fibers.
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However, smaller sized nanoparticles (0-50 nm) were directly incorporated on viscose
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fibers, due to its higher chemical reactivity comparing to cotton fibers (Emam et al.,
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2014, Emam et al., 2015a).
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The most recent researches was interested in preparation of AgNPs using
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different cellulosic fibers (Emam and El-Bisi, 2014) as a removable reducing agent to
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produce merely AgNPs colloidal solution. The reduction of Ag+ to Ag0 was confirmed
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by measuring carboxylic content, as the redox reaction between Ag+ and cellulose
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leads to oxidation of alcoholic and aldehydic groups in cellulose to carboxylic groups
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(Emam and El-Bisi, 2014). For different cellulose fibers, spherical AgNPs with 0-50
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nm size distribution was produced. The smaller sized AgNPs was obtained in case of
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using viscose fibers and the storage showed that it was stable at room temperature up
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to two months.
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Cellulose nanocrystals can be isolated through mechanical treatment, acid
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hydrolysis and enzymatic hydrolysis methods; however, the acid hydrolysis method is
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described as the most commonly used one (Klemm et al., 2011). Cellulose
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nanowiskers were prepared from purified cotton fibers by acid hydrolysis and then
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copolymerized with polyacrylamide by Hebeish et al. Spherical and hyperbranched
285
AgNPs were produced by the so-prepared copolymer under alkaline conditions, with
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size range of 100-150 nm (Hebeish et al., 2014). 10
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Table 1: Comparison between different cellulosic materials for production of AgNPs.
288 State
Cellulosic material
Role / medium
Hydroxypropyl cellulose
Stabilizer / Ethylene
Size (nm) / shape of AgNPs
Reference
3 – 18 / Sherical
Francis et al., 2010
5 – 50 / Sherical
Abdel-Halim et al.,
Hydroxypropyl cellulose
Reducer & Stabilizer /
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glycol
Hydroxypropyl cellulose
2011
Reducer & Stabilizer /
25 – 55 / Sherical
cr
Soluble cellulose (grafted)
NaOH
NaOH Reducer & Stabilizer / NaOH Hydroxyethyl cellulose
Reducer & Stabilizer /
Cellulose nanowiskerspolyacrylamide coploymer Viscose fibers
NaOH
M
carboxymethyl cellulose
Reducer & Stabilizer /
Reducer &Stabilizer / NaOH
d
Hydroxypropyl
11 – 60 / Sherical
an
NaOH
10 – 25 / Spherical
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Carboxymethyl cellulose
Reducer & Stabilizer /
7 – 24 / Spherical
100-150 / Spherical &
Hussain et al., 2015
Hebeish et al., 2010
El-Sheikh et al., 2013
Abdel-Halim et al., 2015 Hebeish et al., 2014
Hyperbranched 25 – 300 / --------
Emam et al., 2013
0 – 50 / Spherical
Emam et al., 2014
0 – 30 / Spherical
Emam and El-Bisi,
Ac ce pt e
Acidic
Viscose fibers
Reducer & Stabilizer / NaOH
Viscose fibers
Reducer & Stabilizer /
(fibers/fabrics)
Insoluble cellulose
NaOH
Lyocell fibers
2014
Reducer & Stabilizer /
25 – 300 / --------
Emam et al., 2013
0 – 30 / Spherical
Emam and El-Bisi,
Acidic
Lyocell fibers
Reducer & Stabilizer / NaOH
Cotton fibers
2014
Reducer & Stabilizer /
0 – 160 / ---------
Emam et al., 2015
0 – 35 / Spherical
Emam and El-Bisi,
NaOH Cotton fibers, DP = 960
Reducer & Stabilizer / NaOH
Cotton fibers, DP = 1850
2014
Reducer & Stabilizer /
0 – 50 / Spherical
NaOH Cotton fabrics
Emam and El-Bisi, 2014
Stabilizer / Citrate
11
20 – 90 / ----------
Rehan et al., 2015
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Direct deposition of AgNPs into cotton fabrics was successfully attained by
289
Rehan et al for multi-functionalization of fabrics (Rehan et al., 2015). In this
290
technique, tri-sodium citrate acted in reducing of Ag+ to Ag0 on the surface of cotton
291
fabrics at 90 °C, and cellulosic chains of fabric stabilized the so-produced AgNPs.
292
XPS analysis confirmed that AgNPs acted as cross-linkers between citrate and
293
cellulose building blocks. Size distribution of the so-produced AgNPs (20-90 nm), but
294
enlarged NPs were produced by using viscose fabrics. Table 1 summarizes recent
295
studies considered with AgNPs produced by using different cellulosic materials.
296
Starch and its derivatives
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According to Vigneshwaran et al. AgNPs was synthesized using glucose as a
298
reducing agent and starch as a capping agent. Ag salt was incubated with starch and
299
glucose at 40 °C for 20 h to give AgNPs with a mean size of 5.3 nm. This AgNPs
300
solution was stable without significant aggregation even after 2 months of storage.
301
Another thermal method, an autoclaving method (15 psi, 121 °C, 5 min), was studied
302
for manufacturing of stable AgNPs in size range of 10–34 nm where soluble starch
303
acted as both a reducing and stabilizing agent (Vigneshwaran et al., 2006). AgNPs
304
were stabilized by entrapping inside the helical amylose structure of starch, as
305
confirmed by iodometric titration.
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Carboxymethyl starch was prepared using 4-(Tri-methyl ammonium methyl)
307
benzo-phenone chloride as photo-initiator for synthesis of AgNPs (El-Sheikh, 2014).
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The reduction of Ag+ to Ag0 was achieved via the generation of active CMS free
309
radicals. Spherical AgNPs with size range of 1-21 nm was obtained and were stable in
310
aqueous solution for three weeks at room temperature. However, using of
311
hydroxypropyl starch gave better results for reduction and stabilization of AgNPs, as
312
AgNPs with smaller size of 2-16 nm was produced (El-Rafie et al., 2011).
313
Recent studies were considered with starch solubilization in alkaline for
314
manufacturing of form small sized spherical AgNPs (El-Rafie et al., 2014).
315
Gelatinization of starch by strong alkali was carried out for :(i) increasing the water
316
affinity of starch building blocks; and subsequently resulted in swelling and
317
significant size increment for starch granules; (ii) increasing starch reducibility by
318
degradation of starch macromolecules to give sugars with lower molecular weights
319
and higher reduction power; and (iii) increasing the affinity of the free hydroxyl
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groups of the so-obtained sugars by removing the protons which in turns acted in
321
reduction of silver ions and generating of nano-silver. Compared to starch derivatives,
322
alkalized starch was more effective as a reductant for Ag ions and stabilizer for
323
AgNPs. As Ag0 with size average of 0-10 nm were produced and high
324
concentrated/well dispersed/stable AgNPs (1000 ppm in 100 ml) was obtained using
325
0.1 g starch (El-Rafie et al., 2014).
326
Sodium alginate and Pectin
ip t
320
AgNPs were recently prepared in alginate hydrocolloids using gamma
328
irradiation (Liu et al., 2009), and on the surfaces of alginate microbeads using
329
photochemical reduction (Saha et al., 2009; Saha et al., 2010). Zahran et al.
330
investigated a simple, safe, one-step and cost effective approach for preparation of
331
AgNPs, using sodium alginate which is solubilized in water as a non toxic and
332
ecofriendly solvent for stable/well dispersed AgNPs. Alkali hydrolysis of sodium
333
alginate was carried out to improve its water solubility, and provide more fragments
334
with higher reducibility. Alkali hydrolyzed alginate played the dual role of a reducer
335
for silver ions and stabilizing agent for the synthesized AgNPs. Highly dispersed
336
small spherical AgNPs with narrow size distribution of 1-4 nm was synthesized from
337
the first minute at 70 °C (Zahran et al., 2014a).
us
an
M
d
Alkali hydrolysis of pectin leads to polymeric destruction, and produced more
Ac ce pt e
338
cr
327
339
soluble/accessible/reducible fragments (galacturonic acid, arabinose, galactose,
340
rhamnose, glucose, mannose, and xylose), a property that is recently being explored
341
for preparation of silver nanocolloids (Zahran et al., 2014b). These fragments were
342
supposed to interact with silver salt in a redox reaction, which in turn, generates
343
AgNPs with particle size of 5-10 nm (Zahran et al., 2014b). The efficiency of alginate
344
in manufacturing of AgNPs is considered to be higher than that of pectin, as smaller
345
sized AgNPs was produced once Ag salt added to hot alkalized alginate solution.
346
Cyclodexrins
347
β-cyclodextrin grafted poly acrylic acid [β-CD-g-PAA] was prepared by
348
Hebeish et al and this copolymer was used as a reductant and a protecting agent
349
concurrently for nano-silver colloidal solutions (Hebeish et al., 2011). The size of
350
nanoparticles was intensively dependent on the type and concentration of alkali, the
351
graft yield of the copolymer, the concentrations of both silver nitrate and copolymer
13
Page 13 of 24
and the method of heating (thermal, ultrasonic or microwave). As size average of 3–6
353
nm, 7–30 nm and 9–42 nm were obtained using ultrasonic, microwave and thermal
354
radiation respectively. Unmodified β-cyclodextrin which was exposed to alkali
355
hydrolysis, acted as both of nano-silver generator and capping agent for the so-
356
prepared nano-structured silver (Premkumar & Geckeler, 2014). Furthermore, the
357
authors studied the preparation of AgNPs with different sizes and many shapes
358
(spherical, polygonal, rod, wire, flower-like and ant-like) by varying the experimental
359
conditions such as the reactant concentrations and temperature.
360
Xanthan and Acacia gums (Gums)
cr
ip t
352
During autoclaving at 121°C, gum ghatti (Anogeissus latifolia) and gum
362
kondagogu was concurrently used as a reducer and stabilizing agent of AgNPs (Kora
363
et al., 2012; Rastogi et al., 2015). Small controllable size of AgNPs (4.8 – 6.4 nm)
364
was obtained by using 0.1 % gum ghatti after autoclaving for 30 minute. While higher
365
amounts of gum kondagogu (0.5 %) was used to produce enlarged particles with mean
366
size of 2 – 9 nm (Rastogi et al., 2015). More recent, Emam et al was studied the usage
367
of alkali soluble xanthan and acacia in production of well dispersed spherical AgNPs
368
(Emam & Zahran, 2015; Emam & El-Rafie et al., 2015). The high alkalinity acted in
369
activation and increment of the reduction power for the considered gums, by
370
generation of soluble and higher reducible fragments. AgNPs with size ranged
371
between 0 and 25 nm was obtained at 70 °C by using alkalized xanthan. Reducing
372
sugar content measured in colloidal solution was significantly high in case of using
373
xanthan, however, similar sized AgNPs with the same concentration was produced by
374
using the same concentration of acacia gum. The unique advantage of using alkali
375
hydrolyzed acacia gum is that, it could be described as energy saving method, where,
376
AgNPs manufacturing was carried out at room temperature after 30 minutes from
377
mixing alkali hydrolyzed acacia gum with silver salt.
378
III. Conclusion
Ac ce pt e
d
M
an
us
361
379
Using of polysaccharides as templates for preparation of AgNPs has shown to
380
be quite effective, since they are ecofriendly, cost effective, biocompatible,
381
biodegradable and easily processed into different hydrogel shapes. From the
382
represented review, it could be summarized that, polysaccharides were firstly applied
383
as stabilizers for preparation of silver nanoparticles; however, recent researches were
14
Page 14 of 24
interested in application of polysaccharide macromolecule as a reducer and stabilizer
385
concurrently by making some of chemical modifications, in order to increase the
386
solubility, reducibility and accessibility of polysaccharide building units. The most
387
recent researches were focused in preparation of merely silver nanoparticles using
388
removable polysaccharide blocks such like cellulosic fibers. Application of AgNPs
389
based on these findings may lead to valuable discoveries in various fields such as
390
medical devices and antimicrobial agents.
391
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Synthesis of Silver Nanoparticles Using Pectin. Carbohydrate Polymers, 111,
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Highlights
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The review focuses on recent synthesis protocols for AgNPs using polysaccharides
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Polysaccharides were firstly applied as capping agents for metal nanoparticles
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Recently polysaccharides were used as both of reducer and stabilizer for AgNPs
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Pure AgNPs colloidal solutions are recently prepared by removable polysaccharides
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