Taraxerol 4‐Methoxybenzoate,an in vitro Inhibitor of Photosynthesis Isolated from Pavonia multiflora A. St‐Hil. (Malvaceae) |
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| Authors: | Leandra Gobira Lopes Gabriela Lopes Tavares Luciana Dias Thomaz José Ricardo Sabino Keyller Bastos Borges Paulo Cezar Vieira Thiago André Moura Veiga Warley de Souza Borges |
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| Institution: | 1. Department of Chemistry, Federal University of Espírito Santo, Vitória, ES, Brazil;2. Department of Biology, Federal University of Espírito Santo, Vitória, ES, Brazil;3. Physics Institute, Federal University of Goiás, Goiania, GO, Brazil;4. Department of Natural Sciences, Federal University of S?o Jo?o Del Rei, S?o Jo?o Del Rei, MG, Brazil;5. Department of Chemistry, Federal University of S?o Carlos, S?o Carlos, SP, Brazil;6. Institute of Environmental Sciences, Chemical and Pharmaceutical, Diadema, SP, Brazil |
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| 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‐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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| Keywords: | Taraxerol 4‐methoxybenzoate
Pavonia multiflora
Photosynthetic inhibitor Phenolic compounds Norisoprenoids |
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