11 documents found, page 1 of 2
Mineral and centesimal contents, antioxidant activity and antimicrobial action ...
Zola, Flávia Guimarães; Rodrigues, Adeline Conceição; Oliveira, Brígida D’Ávila; Sacramento, Nayara Thaís Barbosa; Taylor, Jason GuyPhenolic compounds (PC) have presented antioxidant potential as well as antimicrobial action against several bacteria. This study aimed to extract PC from grumixama (Eugenia brasiliensis Lam.) pulp using solid phase extraction (SPE), then quantify the PC by Folin-Ciocalteu assay, and to evaluate the antioxidant activity (AA) from PC by DPPH, ABTS and FRAP methods as well as its antimicrobial activity by plate d...
Synthesis of xylitan derivatives and preliminary evaluation of in vitro trypano...
Elias, Paula Regina; Coelho, Gleicekelly Silva; Xavier, Viviane Flores; Sales Júnior, Policarpo Ademar; Romanha, Alvaro JoséA series of novel xylitan derivatives derived from xylitol were synthesized using operationally simple procedures. A xylitan acetonide was the key intermediate used to prepare benzoate, arylsulfonate esters and 1,2,3-triazole derivatives of xylitan. These compounds were evaluated for their in vitro anti-Trypanosoma cruzi activity against trypomastigote and amastigote forms of the parasite in T. cruzi-infected c...
Preparation and characterization of a quercetin-tetraethyl ether-based photopro...
Gonçalves, Marlucy da Cruz; Santos, Viviane Martins Rebello dos; Taylor, Jason Guy; Perasoli, Fernanda Barçante; Santos, Orlando David Henrique dosAlthough Quercetin absorbs in the UVA/UVB electromagnetic region, it is limited for applications as a UV filter due to its low lipophilicity and capacity to penetrate the epidermis. In order to overcome this limitation, we synthetized and evaluated the photo protective properties of a derivative obtained from Quercetin. The derivative was prepared by alkylation of Quercetin with iodoethane and characterized by ...
Estudos preliminares da citoxicidade e propriedades fotoprotetoras de derivados...
Gonçalves, Marlucy da Cruz; Taylor, Jason Guy; Rossoni Júnior, Joamyr Victor; Rabelo, Ana Carolina Silveira; Costa, Daniela Caldeira; Cazati, ThiagoA Radiação solar ultravioleta(RUV) pode induzir efeitos à pele devidos a sua ação direta ou indireta, por meio da geração de radicais livres. Esses efeitos podem provocar diversas lesões na pele humana como o câncer de pele. Como medida de proteção da pele contra os efeitos da radiação solar pode-se citar o uso de protetores solares, produtos tópicos adicionados de filtros solares UV sintéticos com propriedades...
Baccharis trimera (Carqueja) Improves metabolic and redox status in an experime...
Kaut, Natália Nogueira do Nascimento; Rabelo, Ana Carolina Silveira; Araújo, Glaucy Rodrigues de; Taylor, Jason Guy; Silva, Marcelo EustáquioDiabetes mellitus is a metabolic disorder that causes severe complications due to the increased oxidative stress induced by disease. Many plants are popularly used in the treatment of diabetes, e.g., Baccharis trimera (carqueja). The aim of this study was to explore the potential application of the B. trimera hydroethanolic extract in preventing redox stress induced by diabetes and its hypoglycemic properties. ...
Low temperature liquid phase catalytic oxidation of aniline promoted by niobium...
Ventura, Wellington Martins; Batalha, Daniel Carreira; Fajardo, Humberto Vieira; Taylor, Jason Guy; Marins, Natália Hadler; Noremberg, Bruno S.A microwave-assisted hydrothermal method was employed to synthesis Nb2O5 (niobium pentoxide) nanoparticles and the effects of synthesis conditions on the physical-chemical properties were evaluated. The catalytic activity of the prepared samples in the liquid phase oxidation of aniline with aqueous hydrogen peroxide as oxidizing agent was also studied. The nanoparticles showed hexagonal structure and rounded sh...
Synthesis of 3,5-Diarylisoxazole derivatives and evaluation of in vitro trypano...
Souza, Aline Aparecida Nunes de; Xavier, Viviane F.; Coelho, Gleicekelly Silva; Sales Júnior, Policarpo Ademar; Romanha, Alvaro JoséChagas disease is included in the neglected tropical diseases list and is endemic to 21 Latin American countries. The two drugs currently available for treating Chagas disease are nifurtimox and benznidazole and both result in many significant side effects. The study describes the synthesis and biological evaluation of 3,5-disubstituted isoxazoles. Isoxazoles were obtained by reaction of flavones and hydroxylam...
Antioxidant, antimicrobial and anti - quorum sensing activities of Rubus rosaef...
Oliveira, Brígida D’Ávila; Rodrigues, Adeline Conceição; Cardoso, Bárbara Moreira Inácio; Ramos, Ana Luiza Coeli Cruz; Bertoldi, Michele CorrêaPhenolic compounds are plant secondary metabolites that present many biological effects includingantioxidant and antimicrobial activities. Studies have shown that these compounds can also inhibitquorum sensing bacterial communication. The aim of this study was to characterize the centesimalcomposition, mineral and phenolic content, to determine the antioxidant and antimicrobial effect aswell as the inhibition o...
Partition study of textile dye remazol yellow gold RNL in aqueous two-phase sys...
Alvarenga, Juliana Maria de; Fideles, Renata Aparecida; Silva, Maira Vieira da; Murari, Gabriella Frade; Taylor, Jason Guy; Lemos, Leandro Rodrigues deThe removal of organic dye pollutants from wastewater produced by the textile industry is a complex problem that presents potential health risks to the general public. Remazol Yellow Gold RNL (YR) dye is readily used to dye cellulose base materials and the methods developed for its removal from aqueous systems are either inefficient or too expensive to be adopted by smaller textile manufactures. Our approach is...
Preparation of polyaminopyridines using a CuI/L-Proline-Catalyzed C-N polycoupl...
Reis, Lindomar A.; Ligiéro, Carolina Bastos Pereira; Andrade, Acácio Aparecido de Castro; Taylor, Jason Guy; Miranda, Paulo Cesar Muniz de LacerdaPolyaminopyridines (PAPy) were chemically prepared from amino-bromopyridines by a CuI/L-proline-catalyzed C-N polycondensation reaction. The formation of the polymer was confirmed by GPC, XRD, XRF, FTIR, UV-vis (λmax = 400 nm), 1H and 13C NMR. The number-average molecular weights (Mn) were estimated by end-group analysis using X-ray fluorescence (up to 6000 Da). TGA analysis of PAPy with higher Mn showed greate...