Ferulic acid esters of sugar carboxylic acids from primary leaves of rye ( secale cereale)

Abstract

New hydroxycinnamic acid esters have been isolated from primary leaves of rye and identified as positional isomers of ( E)- 0-feruloylgluconic acids on the basis of TLC, HPLC, FAB mass spectrometry, 1H NMR and 13C NMR spectroscopy. The 2-( E)- 0-feruloylgluconic acid was the major isomer. A second ferulic acid ester, a very minor constituent in rye, was identified as 2( E)- 0-feruloyl-4-methoxyaldaric acid, which is probably a glucaric acid derivative.