Avaliação da atividade herbicida e citotóxica de produtos naturais de Pluchea sagitallis (asteraceae) e seus derivados sintéticos

• Ano de defesa: 2016
• Autor(a) principal: Carvalho, Ana Calheiros de [UNIFESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo
• Palavras-chave em Português: Cytotoxic; Synthetics; Derivatives; Herbicides; Natural products; Citotóxico; Derivados; Sintéticos; Herbicidas; Produtos naturais
• Link de acesso: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=3660179; http://repositorio.unifesp.br/handle/11600/46594

In this proposal, the herbicide potential of the substances isolated from extracts of the roots of Pluchea sagittalis (Asteraceae) has been studied, a species collected in the area of the copper department of Mina do Sossego, VALE S.A, Canaã dos Carajás - PA. The initial chemical study of that plant drove to the isolation of four compounds: 3,5-dihydroxy-6,7,3', 4'-tetramethoxiflavunol (1), 3,4-dimethoxybenzaldehyde (2), 2,3,4-trihydroxybenzaldeyde (3) 5-hydroxymethylfurfural (4). These metabolites were subjected to in vitro photosynthesis inhibition assays and presented moderate activities. The compound (2) was commercially obtained, as well as its structurally similar derivative, the isovanillin (5), to modify their structures after synthetic procedures. The methods of synthesis allowed to obtain twenty derivatives (6 - 25). The purpose of these transformations is to establish a comparison of the herbicidal activity among natural products and their derivatives, allowing the design of new prototypes for photosynthesis inhibitors. With this same objective, in parallel, the synthetic derivatives, the isolated compound (2) and its structural derivative (5) were evaluated for cytotoxic activity against the following cell lines: B16F10-Nex2 (murine melanoma); HL-60 (human leukemia); MCF-7 (human breast adenocarcinoma); A2058 (human metastatic melanoma); HeLa (human cervical adenocarcinoma); T75 (non-tumorigenic cell). The isolated compounds contributed to the knowledge of some chemical components of the species. The structural changes and biological results can contribute to the design of new herbicides and cytotoxic agents.