Series-coupled capillary columns for the separation of N,(O)-trifluoroacetyl isopropyl derivatives of d,l-aspartic acid and l-hydroxyproline by gas chromatography
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Add time:08/27/2019 Source:sciencedirect.com
N-Triflouroacetyl (TFAc)-d,l-aspartic acid (Asp) isopropyl ester and N,O-TFAc-l-hydroxyproline (Hpr) isopropyl ester, which give overlapping peaks when a single chiral capillary column is used, were separated with a cross-linked polycyanoethyl vinyl siloxane-l-Val-tert.-butylamide capillary column coupled in series with either a cross-linked polyethylene glycol 20M capillary column or a wall-coated OV-101 capillary column. A method for calculating the appropriate lengths of the coupled columns was developed. d,l-Asp and l-Hpr in real samples were also separated using the series-coupled column systems.
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