Characterization and quantitation of hexadecyl, octadecyl, and eicosyl esters of p-coumaric acid in the vine and root latex of sweetpotato [Ipomoea batatas (L.) Lam.]
摘要:
Methanol extracts of vine latex of four cultivars of sweetpotato [Ipomoea batatas (L.) Lam.] were analyzed for their chemical phenolic composition by reversed-phase HPLC. Major components were identified as hexadecyl, octadecyl, and eicosyl p-coumarates by an evaluation of data from UV spectra, hydrolysis, synthesis, and GC/MS of their trimethylsilyl derivatives. Both Z- and E-isomers of the phenolic acid were found, with the latter predominating. Trace quantities of hexadecyl (Z)- and (E)-ferulates were also identified in ester concentrates. Levels of octadecyl (E)-p-coumarate ranged from 0.7% fresh weight in cv. Resisto to almost 2% in cv. Jewel, while the hexadecyl ester levels were only 1/4 to 1/3 these values. Levels of the Z-esters were 1/10 to 1/20 of the levels of the corresponding E-isomers. Levels of the esters in cv. Jewel sweetpotato root latex were 2-10-fold the levels in the vine latex, while the ratio of E-esters to Z-esters was found to be 7-14-fold. The concentration of Z-esters among the sweetpotato cultivars tested correlated closely with the leaf feeding index for the sweetpotato weevil (Cylas formicarius) (R(2): C-20 = 0.96; C-18 = 0.98; C-16 = 0.71). The results indicate a possible relationship between latex chemistry and insect resistance that might be exploited via plant breeding.
Long Chain Alkyl Esters of Hydroxycinnamic Acids as Promising Anticancer Agents: Selective Induction of Apoptosis in Cancer Cells
作者:José C. J. M. D. S. Menezes、Najmeh Edraki、Shrivallabh P. Kamat、Mahsima Khoshneviszadeh、Zahra Kayani、Hossein Hadavand Mirzaei、Ramin Miri、Nasrollah Erfani、Maryam Nejati、José A. S. Cavaleiro、Tiago Silva、Luciano Saso、Fernanda Borges、Omidreza Firuzi
DOI:10.1021/acs.jafc.7b01388
日期:2017.8.23
alkyl esters may possess enhanced biological activities. We evaluated C4, C14, C16, and C18 alkyl esters of p-coumaric, ferulic, sinapic, and caffeic acids (19 compounds) for their cytotoxic activity against four human cancer cells and also examined their effect on cell cycle alteration and apoptosis induction. The tetradecyl (1c) and hexadecyl (1d) esters of p-coumaric acid and tetradecyl ester of caffeic
trans- and cis-Icosyl, docosyl, and tetracosyl p-coumarates, constituents of Artemisia annua L., and their structurally-related compounds were synthesized and evaluated for inhibitory activity on DNA polymerases alpha and beta. Among 30 compounds synthesized, octadecyl trans- and cis-p-coumarates and octadecyl p-hydroxyphenylpropiolate showed strong inhibitory activity on DNA polymerases alpha and
Characterization and quantitation of hexadecyl, octadecyl, and eicosyl esters of p-coumaric acid in the vine and root latex of sweetpotato [Ipomoea batatas (L.) Lam.]
作者:Maurice E. Snook、Emma S. Data、Stanley J. Kays
DOI:10.1021/jf00047a041
日期:1994.11
Methanol extracts of vine latex of four cultivars of sweetpotato [Ipomoea batatas (L.) Lam.] were analyzed for their chemical phenolic composition by reversed-phase HPLC. Major components were identified as hexadecyl, octadecyl, and eicosyl p-coumarates by an evaluation of data from UV spectra, hydrolysis, synthesis, and GC/MS of their trimethylsilyl derivatives. Both Z- and E-isomers of the phenolic acid were found, with the latter predominating. Trace quantities of hexadecyl (Z)- and (E)-ferulates were also identified in ester concentrates. Levels of octadecyl (E)-p-coumarate ranged from 0.7% fresh weight in cv. Resisto to almost 2% in cv. Jewel, while the hexadecyl ester levels were only 1/4 to 1/3 these values. Levels of the Z-esters were 1/10 to 1/20 of the levels of the corresponding E-isomers. Levels of the esters in cv. Jewel sweetpotato root latex were 2-10-fold the levels in the vine latex, while the ratio of E-esters to Z-esters was found to be 7-14-fold. The concentration of Z-esters among the sweetpotato cultivars tested correlated closely with the leaf feeding index for the sweetpotato weevil (Cylas formicarius) (R(2): C-20 = 0.96; C-18 = 0.98; C-16 = 0.71). The results indicate a possible relationship between latex chemistry and insect resistance that might be exploited via plant breeding.