Co-solvent-modified supercritical carbon dioxide extractions of cholesterol and free amino acids from soft-shell turtle fish egg

2008 ◽  
Vol 60 (2) ◽  
pp. 215-222 ◽  
Author(s):  
C SHEN ◽  
S HSU ◽  
C CHANG
Keyword(s):  
Carbon Dioxide ◽  
Amino Acids ◽  
Supercritical Carbon Dioxide ◽  
Free Amino Acids ◽  
Free Amino ◽  
Soft Shell ◽  
Supercritical Carbon

Derivatization of Chiral Amino Acids in Supercritical Carbon Dioxide

2004 ◽  
Vol 76 (3) ◽  
pp. 736-741 ◽  
Author(s):  
María del Mar Caja López ◽  
Gracia P. Blanch ◽  
Marta Herraiz
Keyword(s):  
Carbon Dioxide ◽  
Amino Acids ◽  
Supercritical Carbon Dioxide ◽  
Chiral Amino Acids ◽  
Supercritical Carbon

THE ESTIMATION OF FREE AMINO ACIDS USING A MICRODIFFUSION TECHNIQUE

1952 ◽  
Vol 30 (7) ◽  
pp. 522-528 ◽  
Author(s):  
W. B. McConnell
Keyword(s):  
Carbon Dioxide ◽  
Amino Acids ◽  
Free Amino Acids ◽  
Free Amino ◽  
The Other ◽  
Routine Analysis ◽  
Average Deviation ◽  
Substantial Saving ◽  
Ionic Concentrations ◽  
The Mean

The carbon dioxide evolved when α-amino acids were heated for one hour at 85 °C. with ninhydrin was determined in a partially evacuated microdiffusion cell. Distillation of solvent from one chamber to the other was minimized by keeping the ionic concentrations of the reaction mixture and absorbing mixture approximately equal. The method was useful for samples of amino acids which liberated from 0.06 to 0.3 mgm. of carbon dioxide. The average deviation from the mean was somewhat less than 1% for samples liberating 0.2 mgm. of carbon dioxide. Use of the method for routine analysis of enzymatic digests resulted in substantial saving of time and material.

Free Amino Acids in Plasma and Urine by the Gasometric Ninhydrin-Carbon Dioxide Method

1963 ◽  
pp. 1-13 ◽  
Author(s):  
ELIZABETH G. FRAME ◽  
NEIL Y. CHIAMORI ◽  
PAULINE HALD ◽  
ETHEL CONGER
Keyword(s):  
Carbon Dioxide ◽  
Amino Acids ◽  
Free Amino Acids ◽  
Free Amino

Cyclic α-Amino Acids via Enantioselective Metal-Catalyzed Cascade Reactions of Dienamides in Supercritical Carbon Dioxide

2005 ◽  
Vol 58 (1) ◽  
pp. 63 ◽  
Author(s):  
Euneace Teoh ◽  
W. Roy Jackson ◽  
Andrea J. Robinson
Keyword(s):  
Carbon Dioxide ◽  
Amino Acids ◽  
Supercritical Carbon Dioxide ◽  
Cascade Reactions ◽  
Metal Catalyzed ◽  
Supercritical Carbon

Highly enantioselective conversion of dienamides into cyclic α-amino acids can be achieved by a single-pot, tandem hydrogenation–hydroformylation–cyclization–elimination sequence using a single catalyst and supercritical carbon dioxide (scCO2) as the reaction solvent at total pressures significantly lower than those previously reported for related hydrogenation and hydroformylation reactions.

scholarly journals Irradiation of mixed ices as a laboratory cometary model

2008 ◽  
Vol 4 (S251) ◽  
pp. 447-448
Author(s):  
Maria Colin-Garcia ◽  
Alicia Negrón-Mendoza ◽  
Sergio Ramos-Bernal ◽  
Elizabeth Chacon
Keyword(s):  
Carbon Dioxide ◽  
Amino Acids ◽  
Ionizing Radiation ◽  
Carboxylic Acids ◽  
Free Amino Acids ◽  
Free Amino ◽  
Organic Molecules ◽  
Cometary Nuclei ◽  
Icy Bodies

AbstractIcy bodies in space are being irradiated continuously by ionizing radiation. Therefore, the transformation of organic molecules trapped in extraterrestrial ices might have been possible. This work studied a bulk irradiation of a mixture of some constituents of cometary nuclei. The results show that the formation of different compounds, among them ammonia, carbon dioxide, amines, ureas, free amino acids, and oligomeric material, yields carboxylic acids, amino acids, and purines upon hydrolysis.

Solubility of N-CBZ derivatised amino acids in supercritical carbon dioxide

2004 ◽  
Vol 30 (2) ◽  
pp. 119-125 ◽  
Author(s):  
N. Vedaraman ◽  
G. Brunner ◽  
C. Srinivasa Kannan ◽  
B.V. Ramabrahmam ◽  
P.G. Rao
Keyword(s):  
Carbon Dioxide ◽  
Amino Acids ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Carbon

scholarly journals Solubility Modeling of N-CBZ Derivatised Amino Acids in Supercritical Carbon Dioxide

2014 ◽  
Vol 02 (02) ◽  
pp. 52-63 ◽  
Author(s):  
N. Vedaraman ◽  
Pravin Gadkari ◽  
Balaraman Manohar ◽  
K. V. Sandhya ◽  
Gerd Brunner ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Amino Acids ◽  
Supercritical Carbon Dioxide ◽  
Supercritical Carbon

scholarly journals Mackerel Trypsin Purified from Defatted Viscera by Supercritical Carbon Dioxide

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Byung-Soo Chun ◽  
Hideki Kishimura ◽  
Sitthipong Nalinanon ◽  
Sappasith Klomklao ◽  
Soottawat Benjakul
Keyword(s):  
Carbon Dioxide ◽  
Amino Acids ◽  
Molecular Weight ◽  
Methyl Ester ◽  
Supercritical Carbon Dioxide ◽  
Organic Solvent ◽  
Trypsin Inhibitor ◽  
Calcium Ion ◽  
Sds Page ◽  
Supercritical Carbon

Viscera of mackerel (Scomber sp.) were defatted by supercritical carbon dioxide (SCO2) treatment. Trypsin (SC-T) was then extracted from the defatted powder and purified by a series of chromatographies including Sephacryl S-200 and Sephadex G-50. The purified SC-T was nearly homogeneous on SDS-PAGE, and its molecular weight was estimated as approximately 24,000 Da. N-terminal twenty amino acids sequence of SC-T was IVGGYECTAHSQPHQVSLNS. The specific trypsin inhibitors, soybean trypsin inhibitor and TLCK, strongly inhibited the activities of SC-T. The pH and temperature optimums of SC-T were at around pH 8.0 and , respectively, using Nα-p-tosyl-L-arginine methyl ester as a substrate. The SC-T was unstable below pH 5.0 and above , and it was stabilized by calcium ion. These enzymatic characteristics of SC-T were the same as those of other fish trypsins, especially spotted mackerel (S. borealis) trypsin, purified from viscera defatted by acetone. Therefore, we concluded that the SCO2 defatting process is useful as a substitute for organic solvent defatting process.

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