Gas-liquid chromatography separation of the free phenolic acid fractions in various oilseed protein sources

1974 ◽  
Vol 25 (7) ◽  
pp. 797-802 ◽  
Author(s):  
J. A. Maga ◽  
K. Lorenz
Keyword(s):  
Liquid Chromatography ◽  
Phenolic Acid ◽  
Gas Liquid Chromatography ◽  
Oilseed Protein ◽  
Protein Sources ◽  
Liquid Chromatography Separation

Quantitative Determination of Benzaldehyde in Flavors by Gas-Liquid Chromatography

1963 ◽  
Vol 46 (6) ◽  
pp. 950-951
Author(s):  
Richard L Brunelle ◽  
Glenn E Martin
Keyword(s):  
Liquid Chromatography ◽  
Liquid Phase ◽  
Benzoic Acid ◽  
Quantitative Determination ◽  
Solid Support ◽  
Specific Method ◽  
Gas Liquid Chromatography ◽  
Ultraviolet Spectrophotometry ◽  
Liquid Chromatography Separation

Abstract A rapid and specific method is given for determination of benzaldehyde in the presence of interfering substances by gas-liquid chromatography. Separation is effected on a ¼ column containing 2 5% Apiezon M as the liquid phase on a solid support of Chromoport XXX (60—80 mesh) at isothermal conditions, 100°C. The determination can be performed in the presence of benzoic acid and other interfering substances. Results are compared with those obtained by ultraviolet spectrophotometry on a variety of almond and cherry flavors.

Fusel Oil Determination by Gas-Liquid Chromatography

1963 ◽  
Vol 46 (2) ◽  
pp. 294-297
Author(s):  
Glenn E Martin ◽  
Gian Caggiano ◽  
Howard Schlesinger
Keyword(s):  
Liquid Chromatography ◽  
Liquid Phase ◽  
Isothermal Condition ◽  
Solid Support ◽  
Gas Liquid Chromatography ◽  
Fusel Oil ◽  
Liquid Chromatography Separation

Abstract A method was developed for the determination of fusel oil by gas-liquid chromatography. Separation is effected in a ¼” column containing 20% Ucon polar as the liquid phase, on a solid support of Gas Chrom P at isothermal condition 90° C. The method is simple and expeditious, and the amount of each component alcohol can be determined individually.

EVALUATIONS OF RAPESEED AND SOYBEAN MEALS AS PROTEIN SOURCES FOR SWINE: APPARENT DIGESTIBILITIES OF AMINO ACIDS

1970 ◽  
Vol 50 (3) ◽  
pp. 521-528 ◽  
Author(s):  
C. Y. CHO ◽  
H. S. BAYLEY
Keyword(s):  
Amino Acids ◽  
Liquid Chromatography ◽  
Polyethylene Glycol ◽  
Soybean Meal ◽  
Feed Intake ◽  
Rapeseed Meal ◽  
Gas Liquid Chromatography ◽  
Apparent Digestibility ◽  
Balance Study ◽  
Protein Sources

Semi-purified diets containing either soybean or rapeseed meal were fed to four barrow pigs of 60-kg liveweight in balance study cages. Comparison of feed intake and feces and urine output showed that the apparent digestibilities and biological values of the soybean meal-containing diet were 87.8 and 84.0%, respectively; the corresponding values for the rapeseed meal-containing diet were 78.4 and 78.9%. Samples of feed and feces were hydrolyzed and the n-propyl N-acetyl esters of the amino acids were prepared and separated by gas-liquid chromatography. Apparent digestibilities of the amino acids in the two protein sources were calculated; for soybean meal the values ranged between 85 and 92%, with the exception of methionine, for which the value was only 79%; the value for lysine was 90%. The corresponding values for rapeseed meal were 74 and 86%, with values of 87% for both methionine and lysine. An attempt to use polyethylene glycol as a digestion indicator failed, because rapeseed meal appeared to contain material which interfered with the development of turbidity; however, for the soybean meal-containing diet there were no significant differences between the apparent digestibility values determined with the indicator and those determined using total feces collection.

A study of asphalt-aggregate interactions using inverse gas-liquid chromatography

1974 ◽  
Vol 24 (11) ◽  
pp. 645-654 ◽  
Author(s):  
F. Alan Barbour ◽  
Richard V. Barbour ◽  
J. Claine Peterson
Keyword(s):  
Liquid Chromatography ◽  
Gas Liquid Chromatography

GASCHROMATOGRAPHIC DETERMINATION OF STEROIDS IN THE URINE OF PATIENTS WITH CUSHING'S SYNDROME

1971 ◽  
Vol 67 (2) ◽  
pp. 303-315 ◽  
Author(s):  
A. J. Moolenaar ◽  
A. P. van Seters
Keyword(s):  
Liquid Chromatography ◽  
Cushing’S Syndrome ◽  
Normal Subjects ◽  
Diagnostic Value ◽  
Cushing's Syndrome ◽  
Gas Liquid Chromatography ◽  
Obese Subjects

ABSTRACT The 17-oxosteroids were estimated in the urine of 27 patients with Cushing's syndrome by gas-liquid chromatography (G. L. C.). The values of the various steroid fractions are compared with those of normal subjects, patients with thyrotoxicosis and obese subjects. The effect of the age of the patients on the diagnostic value of the invidual 17-oxosteroids and their ratios is discussed.

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