kovats retention indexes of more than 200 kinds of natural and synthetic compounds of alcohol , aldehyde , acetal , ketone , ether , alkene , nitrile , carboxylic acid , ester , etc . were determined on polar liquid phase ( db-wax ) and nonpolar liquid phase ( db-1 ) by linear temperature-program capillary column gas chromatography .
C0007066
carboxylic acid
C0014898
ester