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- W1522447037 abstract "Structural considerations leading to the development of efficient optically active stationary phases for the separation of enantiomers by gas chromatography are presented. The phases which are derivatives of the di- and the tripeptide of l-valine give the best separation reported thus far for the antipodes of N-trifluoroacetyl (TFA)-α-amino acid esters. The ratio (r) of the retention times of the enantiomers studied has been found to be influenced by the structure of the esterifying alcohol and the temperature. At 100°, e.g., the r values for the N-TFA-alanine esters of primary alcohols are about 1·1, of secondary alcohols about 1·14, and of t-butanol about 1·22, with the l-isomers having throughout the longer retention time. Differences in the enthalphy and entropy of solution of the enantiomers of N-TFA-alanaine t-butyl ester were found to be 0·63–0·67 kcal./mole and 1·22–1·36 cal./mo]e°K, respectively. The phases are a new tool for the qualitative and quantitative determination of the enantiomers of α-amino acids." @default.
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- W1522447037 date "1970-01-01" @default.
- W1522447037 modified "2023-10-18" @default.
- W1522447037 title "Interaction between asymmetric solutes and solvents" @default.
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- W1522447037 doi "https://doi.org/10.1016/s0040-4020(01)93007-8" @default.
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