Chemical investigation of the bitter substances of the fruit of Lonicera caerulea
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Esters of malic and citric acids have been isolated from an ethyl acetate fraction of an ethanolic extraction ofLonicera caerulea L.: dibutyl malate (I), 4-butyl 1-methyl malate (II), 1-butyl 4-methyl malate (III), tributyl citrate (IV), 1,5-dibutyl citrate (V), 1,1′-dibutyl citrate (VI), 1,5-dibutyl 1′-methyl citrate (VII), 1,1′-dibutyl 5-methyl citrate (VIII), 1-butyl citrate (IX), 1′-butyl citrate (X), 1′-butyl 1,5-dimethyl citrate (XI), and 1-butyl 1′,5-dimethyl citrate (XII). Compounds (I-IV, VII, VIII, XI, and XII) had a bitter taste and were the main components of the bitter substances of the fruit ofLonicera caerulea. The structures of compounds (I-XII) were established on the basis of their1H and13C NMR spectra, by FAB mass spectrometry and chromato-mass spectrometry.
KeywordsCitrate Ethyl Acetate Citric Acid Ethanolic Extraction Bitter Taste
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