Author: "Ian-Lih Tsai" / Database: Academic Search Index - Searchworks@Jio Institute Digital Library Search Results

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Author: Chu-Hung Lin, Hsun-Shuo Chang, Hsiang-Ruei Liao, Ih-Sheng Chen, and Ian-Lih Tsai
Subjects: *ROSACEAE, *TRITERPENOIDS, *PLANT extracts, *PROTONS, *NUCLEAR magnetic resonance
Abstract: Two new triterpenoids, 2α,3β-dihydroxyolean-11,13(18)-dien-19β,28-olide (1) and 3β,5β-dihydroxyglutinol (2), together with eight known compounds (3-10) were isolated from the roots of Rhaphiolepis indica var. tashiroi (Rosaceae). The structures of 1-10 were determined by spectroscopic techniques. Among these isolates, 2α,3β-dihydroxyolean-13(18)-en-28-oic acid (9) exhibited inhibitory effect on N-formyl-methionyl-leucyl-phenylalanine (fMLP)-induced superoxide production, with an IC50 value of 16.50 μM. [ABSTRACT FROM AUTHOR]
Published: 2013
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Author: Liang-Yeu Chen, Sie-Rong Li, Po-Yuan Chen, Ho-Chiang Chang, Tzu-Pin Wang, Ian-Lih Tsai, and Eng-Chi Wang
Subjects: *OXIDATION, *DEHYDROGENATION, *BENZOPYRANS, *ACETIC acid, *ELIMINATION reactions, *FATTY acids, *HETEROCYCLIC compounds, *COUMARINS, *CROMOLYN sodium
Abstract: DDQ mediated an oxidation-dehydrogenation of 2-aroyl-3,4-dihydro-2H-benzopyran prepared from salicylaldehyde to yield 2-aroylbenzopyran-4-one. Stochiometric amount of DDQ, acetic acid and water in refluxing dioxane are the optimal condition for this oxidation-dehydrogenation reaction. A rationally proposed mechanism for this oxidation-dehydrogenation process is based on the isolation of a reaction intermediate viz., 2-benzoyl-8-methoxy-3,4-dihydrobenzopyran-4-one and the identification of the 18O-labled carbonyl group of benzopyran-4-one demonstrating incorporation of labeled H218O. [ABSTRACT FROM AUTHOR]
Published: 2010

Author: Yu-Chang Chen, Peng-Yin Chen, Chin-Chung Wu, Ian-Lih Tsai, and Ih-sheng Chen
Subjects: *PLANT extracts, *PLANT roots, *CHEMICALS, *CLUSTERING of particles, *ANALYTICAL chemistry, *PLANTS
Abstract: Analysis of the root extract of Peucedanum formosanum (Taiwan Qian-Hu) led to the isolation of 32 known compounds. The structures of these isolates were determined by spectral data. Some of them displayed strong anti-platelet aggregation activities. Analysis showed that most of the constituents found in P. formosanum were the same as those found in P. praeruptorum (Bai-Hua Qian-Hu), in that many isolates of both plants' roots belong to seselin-type dihydropyranocoumarins and psoralen-type furanocoumarins. [ABSTRACT FROM AUTHOR]
Published: 2008

Author: Hsiou-Ting Kuo, Chien-Fang Peng, Hung-Yi Huang, Chu-Hung Lin, Ih-Sheng Chen, and Ian-Lih Tsai
Subjects: *ANTITUBERCULAR agents, *PISONIA, *UMBELLIFERAE, *BIOLOGICAL assay, *MYCOBACTERIUM tuberculosis, *ACIDS, *CULTURE media (Biology), *GAS chromatography, *LIQUID chromatography, *MASS spectrometry, *MEDICINAL plants, *MOLECULAR structure, *NUCLEAR magnetic resonance spectroscopy, *RESEARCH funding, *PLANT stems, *THIN layer chromatography, *PHYTOCHEMICALS, *SOLID phase extraction, *QUANTITATIVE research, *IN vitro studies
Abstract: Bioassay-guided fractionation of the methanolic extract of the stem of Pisonia umbellifera (Nyctaginaceae) afforded the three new compounds, secopisonic acid (1), 6,8-dimethylisogenistein (2), and (+)-ent-ficusol (3), and four first isolates from nature, pisoninol I (4), pisoninol II (5), pisoquinoline (6), and pisodienone (7), together with fifteen known compounds. Their structures were elucidated by analysis of spectroscopic data. Seven of these isolates, 3, 7, 12, 16, 18, 20, and 21 showed antitubercular activities against Mycobacterium tuberculosis H37RV in vitro, with MIC values ≤ 50 μg/mL. [ABSTRACT FROM AUTHOR]
Published: 2011
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