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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Taraxerol 4-Methoxybenzoate, an in vitro Inhibitor of Photosynthesis Isolated from Pavonia multiflora A. St-Hil. (Malvaceae)

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Author(s):
Lopes, Leandra Gobira [1] ; Tavares, Gabriela Lopes [1] ; Thomaz, Luciana Dias [2] ; Sabino, Jose Ricardo [3] ; Borges, Keyller Bastos [4] ; Vieira, Paulo Cezar [5] ; Moura Veiga, Thiago Andre [6] ; Borges, Warley de Souza [1]
Total Authors: 8
Affiliation:
[1] Univ Fed Espirito Santo, Dept Chem, BR-29060700 Vitoria, ES - Brazil
[2] Univ Fed Espirito Santo, Dept Biol, BR-29060700 Vitoria, ES - Brazil
[3] Univ Fed Goias, Inst Phys, BR-74000970 Goiania, Go - Brazil
[4] Univ Fed Sao Joao del Rei, Dept Nat Sci, BR-36307066 Sao Joao Del Rei, MG - Brazil
[5] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil
[6] Inst Environm Sci Chem & Pharmaceut, BR-09972270 Diadema, SP - Brazil
Total Affiliations: 6
Document type: Journal article
Source: CHEMISTRY & BIODIVERSITY; v. 13, n. 3, p. 284-292, MAR 2016.
Web of Science Citations: 0
Abstract

A phytochemical study of Pavonia multiflora A. St-Hil. (Malvaceae) led to the isolation through chromatographic techniques of 10 secondary metabolites: vanillic acid (1), ferulic acid (2), p-hydroxybenzoic acid (3), p-coumaric acid (4), loliolide (5), vomifoliol (6), 4,5-dihydroblumenol A (7), 3-oxo--ionol (9), blumenol C (10), and taraxerol 4-methoxybenzoate (8), the latter being a novel metabolite. Their structures were identified by H-1- and C-13-NMR, using one- and two-dimensional techniques, and X-ray crystallography. In this work, we report the effect of compounds 5 and 8 on several photosynthetic activities in an attempt to search for new compounds as potential herbicide agents that affect photosynthesis. Both compounds inhibited the electron flow from H2O to methyl viologen; therefore, they act as Hill reaction inhibitors. Using polarographic techniques and studies of the fluorescence of chlorophyll a, the interaction sites of these compounds were located at photosystem II. (AU)