- Email: [email protected]
Briefs
Microchemicd
Journal,
Vol.
8, No. 2
Briefs The Determination of Semen Fructose. M. 2. BARAKAT Biochemistry Department, Faculty of Veterinary Medicine, Cairo, United Arab Republic.
AND EL
S. EL-SAWAF,
Cairo University,
Giza,
A photoelectric, calorimetric method for the microdetermination of fructose is described. The proposed method is sensitive and can be used to determine accurately concentrations of fructose as low as 20 pg. The experimental error does not exceed 2270. This method is recommended for the assay of semen fructose because of its accuracy and simplicity. Micuochem. /. 8, 123 (1964).
The Microdetermination of Ferric Iron. .%FIFY, Biochemistry Department, Faculty Giza, Cairo, United Arab Republic.
M. Z. BARAKAT, S. K. SHERAB, ASD N. of Veterinary Medicine, Cairo University,
The determination of ferric iron is done titrimetrically with limits of the determination range from 300 mg down to 25 pg. Microchem.
I.-ascorbic
acid. The
J. 8, 131 (1964).
Some Equipment for the Determination of Small Amounts of Water in Refrigerant Gases and Propellant Mixtures. HOWARD J. FRANCIS, JR., AND PHILLIP 0. SAWYER, Pennsalt Chemicals Corporation, 900 First Avenue, King of Prussia, Pennsylvania. Equipment is described for the determination of small amounts of water by the Karl Fischer method. A statistical evaluation of a cooperative study indicated that at the 95% confidence level the method is accurate to tl ppm on samples containing 5 mm. Microchem.
/. 8, 139 (1964).
Z-(p-Sulfophenylazo)-1,8-Dihydroxy Naphthalene-3,6-Disulfonic Acid as a KAILASH N. MUNSHI AND ARUN K. Sensitive Reagent for Rare Earth Metals. DEY, Chemical Laboratories, University of Allahabad, Allahabad, India. A spectrophotometric study of the color reaction of Z-(p-sulfophenylazo)-l&dihydroxy naphthalene-3,&disulfonic acid (SPADNS) with rare earth metals is described for the determination of microamounts of rare earths. Microchem.
J. 8, 152 (1964).
BRIEFS
Polarographic Determination of an Aromatic Nitro Compound in the Presence of an Aromatic Amine Compound. HAROLD J. FERRARI, Organic Chemical Research Section, Lederle Laboratories, Pearl River, New York.
A Division
of American
Cyanamid
Company,
A polarographic method for the determination of aromatic nitro compounds is described that is based on the reduction of the nitro group at the dropping-mercury electrode to yield a current which is measurable with appropriate instrumentation. Microchem.
J. 8, 160 (1964).
Chromogenic Reactions of Cerium (III) with Ammonium ate and Its Application to Analysis of Cerium (III). Chemical Laboratories,
University
of Allahabad,
Allahabad,
Aurin TricarboxylSATENDRA P. SANCAL, India.
The studies on the use of colored chelates for the determination of metals have been extended to the reaction between cerium (III) and ammonium aurin tricarboxylate, and a structure has been proposed for the chelate formed. Microchem.
Thin-Layer carbonyl
J. 8, 169 (1964).
Chromatography of Carbonyl bis(2,4-Dinitrophenylhydrazones)
Compounds. Separation of Diinto Classes. D. P. SCHWARTZ,
M. KEENEY, AND 0. W. PARKS, Dairy Products Research and Development Division, Agricultural ment of Agriculture, Washington, D. C.
Laboratory, Eastern Utilization Research Service, LJ. S. Depart-
Separation is accomplished on weakened magnesia-Celite plates in an acetonebenzene-methanol system in approximately 40 minutes. Classification of 4 x lo--” ymoles of a bis(2,4-dinitrophenylhydrazone) is possible. Diketone spots are violet, while a-ketoaldehydes and glyoxal are blue. Microchem.
J. 8, 176 (1964).
Relative Conductometric Determination of Carbon, Hydrogen, Oxygen, and Sulfur. HANNS MALISSA AND WILHELM SCHMIDTS, Institut fiir Analytische Chemie und Mikrochemie
der Technischen
Hochschule
Wien, Wien, Austria.
Rapid combustion at temperatures above 1000°C in a stream of oxygen gives carbon dioxide, water, and sulfur dioxide which are absorbed in suitable solutions, and the change in electrical conductivity in each case is measured and recorded. Microchem.
J. 8, 180 (1964).
BRIEFS
Micromethods
for the Study of Leucine Aminopeptidase.
ment of Zoology,
The University
of Adelaide,
W. P. ROGERS,DepavtSouth Australia.
The activity of small amounts of leucine aminopeptidase was estimated by the production of 0.24.8 pg of ammonia-nitrogen from the specific substrate, L-leucinamide. Microchem.
J. 8, 194 (1964).
Journal,
Vol.
8, No. 2
Briefs The Determination of Semen Fructose. M. 2. BARAKAT Biochemistry Department, Faculty of Veterinary Medicine, Cairo, United Arab Republic.
AND EL
S. EL-SAWAF,
Cairo University,
Giza,
A photoelectric, calorimetric method for the microdetermination of fructose is described. The proposed method is sensitive and can be used to determine accurately concentrations of fructose as low as 20 pg. The experimental error does not exceed 2270. This method is recommended for the assay of semen fructose because of its accuracy and simplicity. Micuochem. /. 8, 123 (1964).
The Microdetermination of Ferric Iron. .%FIFY, Biochemistry Department, Faculty Giza, Cairo, United Arab Republic.
M. Z. BARAKAT, S. K. SHERAB, ASD N. of Veterinary Medicine, Cairo University,
The determination of ferric iron is done titrimetrically with limits of the determination range from 300 mg down to 25 pg. Microchem.
I.-ascorbic
acid. The
J. 8, 131 (1964).
Some Equipment for the Determination of Small Amounts of Water in Refrigerant Gases and Propellant Mixtures. HOWARD J. FRANCIS, JR., AND PHILLIP 0. SAWYER, Pennsalt Chemicals Corporation, 900 First Avenue, King of Prussia, Pennsylvania. Equipment is described for the determination of small amounts of water by the Karl Fischer method. A statistical evaluation of a cooperative study indicated that at the 95% confidence level the method is accurate to tl ppm on samples containing 5 mm. Microchem.
/. 8, 139 (1964).
Z-(p-Sulfophenylazo)-1,8-Dihydroxy Naphthalene-3,6-Disulfonic Acid as a KAILASH N. MUNSHI AND ARUN K. Sensitive Reagent for Rare Earth Metals. DEY, Chemical Laboratories, University of Allahabad, Allahabad, India. A spectrophotometric study of the color reaction of Z-(p-sulfophenylazo)-l&dihydroxy naphthalene-3,&disulfonic acid (SPADNS) with rare earth metals is described for the determination of microamounts of rare earths. Microchem.
J. 8, 152 (1964).
BRIEFS
Polarographic Determination of an Aromatic Nitro Compound in the Presence of an Aromatic Amine Compound. HAROLD J. FERRARI, Organic Chemical Research Section, Lederle Laboratories, Pearl River, New York.
A Division
of American
Cyanamid
Company,
A polarographic method for the determination of aromatic nitro compounds is described that is based on the reduction of the nitro group at the dropping-mercury electrode to yield a current which is measurable with appropriate instrumentation. Microchem.
J. 8, 160 (1964).
Chromogenic Reactions of Cerium (III) with Ammonium ate and Its Application to Analysis of Cerium (III). Chemical Laboratories,
University
of Allahabad,
Allahabad,
Aurin TricarboxylSATENDRA P. SANCAL, India.
The studies on the use of colored chelates for the determination of metals have been extended to the reaction between cerium (III) and ammonium aurin tricarboxylate, and a structure has been proposed for the chelate formed. Microchem.
Thin-Layer carbonyl
J. 8, 169 (1964).
Chromatography of Carbonyl bis(2,4-Dinitrophenylhydrazones)
Compounds. Separation of Diinto Classes. D. P. SCHWARTZ,
M. KEENEY, AND 0. W. PARKS, Dairy Products Research and Development Division, Agricultural ment of Agriculture, Washington, D. C.
Laboratory, Eastern Utilization Research Service, LJ. S. Depart-
Separation is accomplished on weakened magnesia-Celite plates in an acetonebenzene-methanol system in approximately 40 minutes. Classification of 4 x lo--” ymoles of a bis(2,4-dinitrophenylhydrazone) is possible. Diketone spots are violet, while a-ketoaldehydes and glyoxal are blue. Microchem.
J. 8, 176 (1964).
Relative Conductometric Determination of Carbon, Hydrogen, Oxygen, and Sulfur. HANNS MALISSA AND WILHELM SCHMIDTS, Institut fiir Analytische Chemie und Mikrochemie
der Technischen
Hochschule
Wien, Wien, Austria.
Rapid combustion at temperatures above 1000°C in a stream of oxygen gives carbon dioxide, water, and sulfur dioxide which are absorbed in suitable solutions, and the change in electrical conductivity in each case is measured and recorded. Microchem.
J. 8, 180 (1964).
BRIEFS
Micromethods
for the Study of Leucine Aminopeptidase.
ment of Zoology,
The University
of Adelaide,
W. P. ROGERS,DepavtSouth Australia.
The activity of small amounts of leucine aminopeptidase was estimated by the production of 0.24.8 pg of ammonia-nitrogen from the specific substrate, L-leucinamide. Microchem.
J. 8, 194 (1964).