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Supercritical CO2 for sample extraction
News
Supercritical &ids. with properties intermediate between liquids and gases, are effective at exiracling a variety of compounds from solid or semi-solid samples. Supercritical fluid extraction is quicker, simpler, more selective, more eticient and more easily automated than conventional extraction. Hewlett-Packard have announced details cif !he hrst graphics-driven, computercontrolled supercritical fluid extractor for laboraton/ cample preparation. the HP768M. A status screen shows a schemaric diagram of the sampie-flow path, with continuous updates as the extraction
Supercritical CO, for Sample Extraction progresses. To optimize extraction conditions, the extractor has an electronically controlled nozzle which allows indrpendent adjustment oi flow and pressure. A sudden pressure drop at the nozzle changes the supercritical fiuid to a gas; anaiytes droo out of sotution and are deposi!ed in a trap next to the nozzle. Extraction with the HP768CA may be used to replace extraction using the Souhlet or other manual liquid-solid extraction
techniques. tjserscan work with a kide range of sampie sizes, mamces, anaibte c.oflcentra:ions and analyte properties. flexibility is assured by a chcire of three on-tine CO;-based extra&xl solvents, a user-controlled heat&ooled anal@ trap and a choice oi output dir&on, to autosamp!er vial or waste. For further informawn, enler w. 3 on the reader advertising enquiry card.
Eliminating Protein Deposition and Corrosion The introductioriof teflon-lixd stainless steel ;ripe.\ork in wme areas ofthe fo& and bxKf,enical indus?ries may be us&l in preventing the prote;n de~sitinn that often wxurs in cowentiorxi ~ytems. Addition4 applications may he in the handling ofacidic food prOducts, where corrasioo may present a problem, or in the harJiingof\-i~ous products \\rhich may be hampered by the loss oi
polished ~IM&Iin conveMlona1 stainleG steei p&m.
1989 World Health StatisticsAnnual The 1969 Wor!d Heaith Statistics AnnuaL was published in March by the World Health Organization {WHCt). Section 5 of the report publishes the first results of the WHO MONICA project. The MONICA project comprises a network of 39 collaborating centres in 26 countries The total population (in the age range 25-64) years! being monitored is 15 million. The project was established to clarify the reasons for the geographical differences in the mortaliry statistics for coronary heart disease. The study has confirmed the importance of such risk factors as high serum cholesterol, high blood pressure, obesity and
smoking.,
Chinese Genes may fmprsw Canadian Canola Canada and China are the largest producers and consumers oi rape& in the wr!d. The maior variety oirapeseed bred for the production of cooking oils, can&. is su5ceptible to a disease called root rot. tiowever, foO;fowinga colla~borative project behwen scier.tistr at the University of Mannitoba and Chinese colleagues, the incorporation of genes from reistant Chinese varieties offers an opportanitv to
Trends
in Food Science& Technology
Putting
science
to work
IF___~
Trends in Food Science & Techwrogy July 1990
‘,
--__
Supercritical &ids. with properties intermediate between liquids and gases, are effective at exiracling a variety of compounds from solid or semi-solid samples. Supercritical fluid extraction is quicker, simpler, more selective, more eticient and more easily automated than conventional extraction. Hewlett-Packard have announced details cif !he hrst graphics-driven, computercontrolled supercritical fluid extractor for laboraton/ cample preparation. the HP768M. A status screen shows a schemaric diagram of the sampie-flow path, with continuous updates as the extraction
Supercritical CO, for Sample Extraction progresses. To optimize extraction conditions, the extractor has an electronically controlled nozzle which allows indrpendent adjustment oi flow and pressure. A sudden pressure drop at the nozzle changes the supercritical fiuid to a gas; anaiytes droo out of sotution and are deposi!ed in a trap next to the nozzle. Extraction with the HP768CA may be used to replace extraction using the Souhlet or other manual liquid-solid extraction
techniques. tjserscan work with a kide range of sampie sizes, mamces, anaibte c.oflcentra:ions and analyte properties. flexibility is assured by a chcire of three on-tine CO;-based extra&xl solvents, a user-controlled heat&ooled anal@ trap and a choice oi output dir&on, to autosamp!er vial or waste. For further informawn, enler w. 3 on the reader advertising enquiry card.
Eliminating Protein Deposition and Corrosion The introductioriof teflon-lixd stainless steel ;ripe.\ork in wme areas ofthe fo& and bxKf,enical indus?ries may be us&l in preventing the prote;n de~sitinn that often wxurs in cowentiorxi ~ytems. Addition4 applications may he in the handling ofacidic food prOducts, where corrasioo may present a problem, or in the harJiingof\-i~ous products \\rhich may be hampered by the loss oi
polished ~IM&Iin conveMlona1 stainleG steei p&m.
1989 World Health StatisticsAnnual The 1969 Wor!d Heaith Statistics AnnuaL was published in March by the World Health Organization {WHCt). Section 5 of the report publishes the first results of the WHO MONICA project. The MONICA project comprises a network of 39 collaborating centres in 26 countries The total population (in the age range 25-64) years! being monitored is 15 million. The project was established to clarify the reasons for the geographical differences in the mortaliry statistics for coronary heart disease. The study has confirmed the importance of such risk factors as high serum cholesterol, high blood pressure, obesity and
smoking.,
Chinese Genes may fmprsw Canadian Canola Canada and China are the largest producers and consumers oi rape& in the wr!d. The maior variety oirapeseed bred for the production of cooking oils, can&. is su5ceptible to a disease called root rot. tiowever, foO;fowinga colla~borative project behwen scier.tistr at the University of Mannitoba and Chinese colleagues, the incorporation of genes from reistant Chinese varieties offers an opportanitv to
Trends
in Food Science& Technology
Putting
science
to work
IF___~
Trends in Food Science & Techwrogy July 1990
‘,
--__