DEFAR - Artigos publicados em periódicos

URI permanente para esta coleçãohttp://www.hml.repositorio.ufop.br/handle/123456789/531

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2020 - 20223

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Data inicial: 2020Assunto: search.filters.subject.Photoprotection

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Agora exibindo 1 - 3 de 3
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    Photoprotective property and cytotoxicity of polar extracts of three species of Maytenus native to the Southwest of Bahia.
    (2020) Pereira, Rosângela dos Santos; Aguiar, Rosane Moura; Lemos, Gisele da Silveira; Vieira Filho, Sidney Augusto; Oliveira, Djalma Menezes de
    Maytenus acanthophylla, M. rigida and M. truncata (Celastraceae) are used in the traditional medicine of Chapada Diamantina and Southwest Bahia, Brazil. The infusion and decocto of its leaves are used in the treatment of inflammation and gastric disorders. In this context, it is important to identify chemical and biological properties that reinforce this traditional use. The objective of this study was to determine the total phenolic and flavonoid content by the Folin-Ciocalteau method, the photoprotective property by in vitro spectrophotometric method and the acute toxicity by the mortality index of Artemia salina, of polar extracts of these three Maytenus species. It was observed that the species have similar levels of total phenolic and flavonoid. The presence of compounds containing chromophore groups, which absorb radiation in the UV region between 290 and 320 nm, gives the extracts promising sun protection factors. In the tests with A. salina, the median lethal concentration values were high (≥1000.0 μg/mL) indicating the low toxicity of these extracts. The results contribute to the knowledge of the polar extracts of the three Maytenus species of the Southwest of Bahia, to the validation of the therapeutic properties of these plants and opens perspectives of new studies of photoprotection.
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    In vitro and in silico investigation of the photoprotective and antioxidant potential of Protium spruceanum leaves and its main flavonoids.
    (2022) Amparo, Tatiane Roquete; Silva, Anne Cherem Peixoto da; Seibert, Janaína Brandão; Silva, Débora dos Santos da; Santos, Viviane Martins Rebello dos; Vieira, Paula Melo de Abreu; Brandão, Geraldo Célio; Souza, Gustavo Henrique Bianco de; Santos, Bianca Aloise Maneira Corrêa
    For the first time, the photoprotective potential (UV absorption and antioxidant properties) of Protium spru- ceanum leaves and its main flavonoids was investigated combining an in vitro and in silico approach. The extract was standardized in rutin content (0.8% w/w), quantified by a validated HPLC-DAD method. The extract pro- tected fibroblasts and keratinocytes against cell death in the stress oxidative H2O2-induced test, with greater effect than rutin standard. This cytoprotection is correlated to the free radical scavenging action, determined by DPPH method. The theoretical investigation on the UV absorption showed an excellent correlation of the results (R2 = 0.911) allowing valuable information about the photoprotective properties of rutin, afzelin and quercitrin, as the importance of the A, B and C rings in the UV absorption property and the hydroxyls in B ring (catechol group) leading to a better antioxidant action. Therefore, the extract from P. spruceanum leaves is a promising candidate for sunscreen development.
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    Melaleuca leucadendron (L.) L. flower extract exhibits antioxidant and photoprotective activities in human keratinocytes exposed to ultraviolet B radiation.
    (2020) Silva, Luan Silvestro Bianchini; Perasoli, Fernanda Barçante; Carvalho, Karen Vitor; Vieira, Karla Murata; Lopes, Miriam Teresa Paz; Souza, Gustavo Henrique Bianco de; Santos, Orlando David Henrique dos; Freitas, Katia Michelle
    Recently, there has been a demand for the replacement of chemical sunscreens with natural compounds that could prevent or restore UV-induced skin damage. Here, we investigated the photoprotective influence of the Melaleuca leucadendron ethanolic flower extract (EEMec) on factors involved in cellular and molecular UVBinduced oxidative stress in human skin keratinocytes (HaCaT). The phytochemical constituents, antioxidant potential by DPPH assay, content of total phenolic and flavonoid compounds in EEMec were evaluated. HaCaT cells were treated with EEMec followed by irradiation with UVB. CAT activity; GSH and ROS levels; and SOD1, GPx, CAT and COX-2 expression assays were employed to verify the oxidative stress, as well as EEMec effect on transmembrane transport, and pro-inflammatory and pro-apoptotic protein expression. EEMec reverted the viability loss of HaCaT cells after irradiation with UVB, exhibited significant antioxidant capacity and free radical scavenging activity in vitro, inhibited COX-2 expression and ensure protection of DNA-damage. EEMec shown a great photoprotective property to prevent keratinocytes damage induced by UV radiation and, thus a candidate potential to application as an adjuvant in sunscreen formulations as a strategy to reduce risk of sunburn and prevent skin diseases associated with UV-induced inflammation and cancer.