Gas chromatographic determination of thermodynamic properties of polymer solutions at high pressure

AIChE Journal ◽  
1973 ◽  
Vol 19 (6) ◽  
pp. 1133-1139 ◽  
Author(s):  
Norman F. Brockmeier ◽  
Ronald E. Carlson ◽  
Robert W. McCoy
Keyword(s):  
High Pressure ◽  
Thermodynamic Properties ◽  
Polymer Solutions ◽  
Chromatographic Determination

Gas Chromatographic Determination of Thermodynamic Properties of Polymer Solutions

1972 ◽  
Vol 5 (2) ◽  
pp. 130-132 ◽  
Author(s):  
N. F. Brockmeier ◽  
R. W. McCoy ◽  
J. A. Meyer
Keyword(s):  
Thermodynamic Properties ◽  
Polymer Solutions ◽  
Chromatographic Determination

High Pressure Liquid Chromatographic Determination of Monensin in Feed Premixes

1983 ◽  
Vol 66 (2) ◽  
pp. 284-286
Author(s):  
Thomas D Macy ◽  
Andrew Loh
Keyword(s):  
High Pressure ◽  
Coefficient Of Variation ◽  
Chromatographic Determination ◽  
Hplc Method ◽  
High Pressure Liquid Chromatographic ◽  
Average Recovery ◽  
Bioassay Method ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic

Abstract A high pressure liquid chromatographic (HPLC) method has been developed to determine monensin in feed premixes. The method is simple and rapid. Monensin is extracted with methanol-water and determined in the extracting solution by HPLC. Average recovery for monensin from a 13.2% premix sample was 103% (coefficient of variation (CV), 2.6%) by HPLC and compares with the value of 100% (CV, 3.4%) obtained by the turbidimetric bioassay method.

High Pressure Liquid Chromatographic Determination of Vitamins A and E in Cereal Products

1979 ◽  
Vol 62 (3) ◽  
pp. 637-641
Author(s):  
Warren A Widicus ◽  
James R Kirk
Keyword(s):  
High Pressure ◽  
Direct Injection ◽  
Chromatographic Determination ◽  
Retinyl Palmitate ◽  
Tocopheryl Acetate ◽  
High Pressure Liquid Chromatographic ◽  
Cereal Products ◽  
Average Recovery ◽  
Liquid Chromatographic

Abstract A rapid method for the simultaneous determination of vitamins A and E in fortified cereal products has been developed. Saponification of retinyl or tocopheryl esters is not required, permitting direct injection of the extracted lipids onto the high pressure liquid chromatographic column without sample cleanup. Elution times of 2.46 and 3.40 min were determined for retinyl palmitate and tocopheryl acetate, respectively, using a μPorasil column and an isocratic mobile phase of hexane-chloroform (85+15) with a flow rate of 1.5 mL/min. The average recovery of retinyl palmitate was 99.2% (std dev. 4.28), and the average recovery of tocopheryl acetate was 94.9% (std dev. 4.10) in 2 cereals containing corn, oat, rice, and wheat. No significant amounts of naturally occurring tocopherols were found in the cereals.

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