Taraxerol 4-methoxybenzoate, an in vitro</i> inhibitor of photosynthesis isolated from Pavonia multiflora A. St-Hil. (Malvaceae)
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2016
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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-α-ionol (9), blumenol C (10), and taraxerol 4-methoxybenzoate (8), the latter being a novel metabolite. Their structures were identified by 1H- and 13C-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.
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LOPES, Leandra Gobira et al. Taraxerol 4-methoxybenzoate, an in vitro</i> inhibitor of photosynthesis isolated from Pavonia multiflora A. St-Hil. (Malvaceae). Chemistry & Biodiversity, Zurich, v. 13, n. 3, p. :284-292, 2016. DOI: 10.1002/cbdv.201500049. Disponível em: https://onlinelibrary.wiley.com/doi/10.1002/cbdv.201500049. Acesso em: 23 jan. 2024.