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Lignan Glycosides and Phenolic Compound Glycosides from the Branches of <i>tabebuia chrysotricha</i>

American Journal of Plant Sciences 2015年第5期6卷 676-684页

作者： Shinji Takahashi Susumu Kawakami Sachiko Sugimoto Katsuyoshi Matsunami Hideaki Otsuka Graduate School of Biomedical and Health Sciences Hiroshima University Hiroshima Japan Faculty of Pharmacy Yasuda Women’s University Hiroshima Japan

From the branches of tabebuia chrysotricha (Bignoniaceae), two lignan glycosides (1, 2) and two phenolic compound glycosides (3, 4) were isolated, along with 15 known compounds (5 - 19). The structures of the new compounds were elucidated on the basis of spectroscopic evidence and those of the known compounds were identified by comparison of spectroscopic data with those reported in the literature. The DPPH radical-scavenging activity was assayed for the compounds isolated, the aryltetralin-type lignans showing moderate activity.

关键词： tabebuia chrysotricha Bignoniaceae Lignan Glycoside Phenolic Glycoside DPPH Radical-Scavenging Activity

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Antioxidant Activity and Phytochemical Screening of Crude Endophytes Extracts of <i>tabebuia argentea</i>Bur. &K. Sch.

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American Journal of Plant Sciences 2013年第8期4卷 1641-1652页

作者： M. Govindappa R. Channabasava K. R. Sunil Kumar K. C. Pushpalatha Department of Biotechnology Shridevi Institute of Engineering & Technology Tumkur India Department of Studies in Biochem- istry Mangalore University PG Center Cauvery Campus Madikeri India.

The aim of this study is to investigate in vitro antioxidant activities and the phytochemical screening endophytes. Seven different endophytic fungi were isolated from different parts of the plant and their extracts subjected to know antioxidant properties and phytochemical screening. Phytochemical analysis revealed the presence of tannins, flavonoids, steroids, alkaloids, phenols and proteins from different solvents extracts of different endophytes. The antioxidant activity was evaluated by six separated methods: scavenging of free radical DPPH, FRAP, TBA, superoxide radical, FTC and iron methods. All seven different endophytes yielded almost all phytochemicals in methanol extracts which were tested. The endophytes A. niger, Penicillium sp. and Trichoderma sp. have shown potential in vitro antioxidant activities. Further work is needful to isolate the exact compound which is responsible for antioxidant activity and biophysical characterization will be done in the future.

关键词： tabebuia argentea Endophytes Antioxidant Activity Phytochemicals

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