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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: CHEMISTRY & BIODIVERSITY; v. 13, n. 3, p. 284-292, MAR 2016.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 10/52326-9 - Estudo de produtos naturais oriundos de plantas do cerrado e mata atlântica: conhecimento químico-biológico aliado à preservação
• Beneficiário: Paulo Cézar Vieira
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular