Chemical investigation of the bitter substances of the fruit of Lonicera caerulea

Autor: Vereshchagin, A. L., Anikina, E. V., Syrchina, A. I., Lapin, M. F., Azin, L. A., Semenov, A. A.
Zdroj: Chemistry of Natural Compounds; May 1989, Vol. 25 Issue: 3 p289-292, 4p
Abstrakt: 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.
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