Chemical investigation of the bitter substances of the fruit of Lonicera caerulea
- 139 Downloads
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
Unable to display preview. Download preview PDF.
- 1.E. A. Anikina, A. I. Syrchina, A. L. Vershchagin, M. F. Lapin, and A. A. Semenov, Khim. Prir. Soedin., No. 4, 598 (1988).Google Scholar
- 2.Z. Samek and M. Budesinsky, Coll. Czech. Chem. Commun.,23, 558 (1979).Google Scholar
- 3.E. V. Anikina, A. L. Vereshchagin, A. I. Syrchina, M. F. Larin, and A. A. Semenov, Khim. Prir. Soedin., No. 4, 599 (1988).Google Scholar
- 4.N. I. Salit and A. S. Sadykov, “A study of some properties of malic and citric acid esters, in: The Chemistry of Plant Substances [in Russian], Scientific Proceedings of Tashkent State University, No. 286, Vol. II (1966), p. 45.Google Scholar
- 5.H. C. Benedict, Chemistry,47, No. 1, 27 (1974); Chem. Abstr.,80, 58974 (1974).Google Scholar