Results 161 to 170 of about 16,195 (202)
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Naphthalene Analogues of Lignans
The Journal of Organic Chemistry, 2002The methodology for the synthesis of podophyllotoxin and thuriferic acid-type lignans has been applied to derivatives carrying a naphthalene moiety. Starting from the 1,3-dithiane of 2-naphthaldehyde afforded the expected analogues in the 2,1-naphthalene series.
Blanca, Madrigal +4 more
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Lignans from Larrea divaricata
Journal of Pharmaceutical Sciences, 1974Abstract A phytochemical reinvestigation of the phenolics of Larrea divaricata led to the isolation and characterization of dihydroguaiaretic acid, norisoguaiacin, and 3'-demethoxyisoguaiacin. Partially demethylated dihydroguaiaretic acid was detected via the use of partially demethylated dihydroguaiaretic acid synthesized from dihydroguaiaretic ...
O, Gisvold, E, Thaker
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Chromatographic analysis of lignans
Journal of Chromatography A, 2006Methods and procedures for analysis of lignans in trees and other plants are reviewed. The importance of cautious sample handling and pretreatment procedures to avoid contamination, loss of sample, and unwanted chemical reactions is discussed. Sequential extraction with a non-polar solvent followed by extraction with acetone or ethanol is recommended ...
S M, Willför, A I, Smeds, B R, Holmbom
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Phytotoxic lignans ofLeucophyllum frutescens
Natural Toxins, 1999Bioassay-guided fractionation of the hexane:ethyl acetate (1:1) extract of the leaves of Leucophyllum frutescens (Berl.) I.M.Johnst (Scrophulariaceae) led to the isolation of its phytotoxic constituents diayangambin (1), epiyangambin (2), diasesartemin (3) and epiashantin (4). Phytotoxicity was demonstrated as inhibition of seed germination of Agrostis
A M, Rimando +3 more
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Polycyclic Spiro Lignans and Biphenyl Tetrahydrofuranone Lignans from Gymnotheca involucrata
Planta Medica, 2016Four rare polycyclic spiro lignans (1-4) and four new biphenyl tetrahydrofuranone lignans (5-8) were isolated from the whole plant of Gymnotheca involucrata. The structures of the new compounds were elucidated on the basis of detailed spectroscopic analysis and the absolute configuration of 1 was confirmed by single crystal X-ray diffraction.
Shi-Ji, Xiao +7 more
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Antioxidant Lignans from Larrea tridentata
ChemInform, 2004AbstractFor Abstract see ChemInform Abstract in Full Text.
Abou-Gazar H. +4 more
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Biosynthetic relationship of aryltetralin lactone lignans to dibenzylbutyrolactone lignans
Phytochemistry, 1986Abstract Feeding experiments in Podophyllum hexandrum plants have shown that the dibenzylbutyrolactone lignan yatein is a satisfactory precursor of the aryltetralin lignan podophyllotoxin. The corresponding cis isomer of yatein was also incorporated, but to a lesser extent, and probably via yatein.
Widad M. Kamil, Paul M. Dewick
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Lignans have garnered significant interest in various fields of pharmaceuticals, nutrition, and pesticides due to their diverse biological activities. This chapter primarily focuses on the extraction and purification methods of lignans from Schisandra, followed by an extensive examination of qualitative and quantitative analytical techniques, including
Hye Mi Kim, Chul Young Kim
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Hye Mi Kim, Chul Young Kim
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Lignans from cultivated Gynuranepalensis
China Journal of Chinese Materia Medica, 2016Taking application of some isolation and purification technologies, including solvent extraction, rude solvent isolation, column chromatographies on silica gel and Sephadex LH-20 , and preparative HPLC , 4 compounds were obtained from Gynura nepalensis cultivated in a suburban area of Beijing.
Zhi-Hui, Zhang +6 more
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