10 documents found, page 1 of 1

A comprehensive characterization of polyphenols by LC-ESI–QTOF-MS from Melipona...

Antiproliferative Constituents of Geopropolis from the Bee Melipona scutellaris

The correlation between the phenolic composition and biological activities of t...

The correlation between the phenolic composition and biological activities of t...

Biological assays that have been performed on different types of Brazilian propolis have shown that type 6 propolis (G6) has a strong antimicrobial activity and a low flavonoid content. This study aimed to evaluate the correlation between the phenolic composition and the biological activities displayed by propolis G6 from the state of Bahia and green propolis, also known as type 12 (G12). The values of the flav...

Isolation and analysis of bioactive isoflavonoids and chalcone from a new type ...

Activity-directed fractionation and purification processes were employed to identify isoflavonoids with antioxidant and antimicrobial activities from Brazilian red propolis. Crude propolis was extracted with ethanol (80%, v/v) and fractioned by liquid–liquid extraction technique using hexane and chloroform. Since chloroform fraction showed strong antioxidant and antimicrobial activities it was purified and isol...

Identification of a bioactive compound isolated from Brazilian propolis type 6.

A prenylated benzophenone, hyperibone A, was isolated from the hexane fraction of Brazilianpropolistype6. Its structure was determined by spectral analysis including 2D NMR. This compound exhibited cytotoxic activity against HeLa tumor cells (IC50 = 0.1756 μM), strong antimicrobial activity (MIC range—0.73–6.6 μg/mL; MBC range—2.92–106 μg/mL) against Streptococcus mutans, Streptococcus sobrinus, Streptococcus o...

Biological activities of the fermentation extract of the endophytic fungus Alte...

A total of 22 endophytic fungi isolated from coffee (Coffea arabica L.) were cultivated in vitro and their crude extracts tested. The screening was carried out using the agar diffusion method against Staphylococcus aureus, Escherichia coli and Candida albicans. The most effective isolate was Alternaria alternata, and subsequently, its extract was assayed. The total phenolic content was 3.44 μg GAE/mg of th...

The "in vitro" antifungal activity evaluation of propolis G12 ethanol extract o...

Criptococose, doença cosmopolita, causada pelo agente etiológico Cryptococcus neoformans, está associada, principalmente, a indivíduos imunocomprometidos. O acometimento de animais é relativamente raro, exceto, nos casos associados à prolongada antibioticoterapia. A própolis é uma resina que pode apresentar diversas propriedades biológicas, incluindo atividades antibacterianas, antifúngicas e antivirais. Amostr...

Determinação de qualidade de propolis de Apis mellifera africanizada da região ...

Orientador: Yong Kun Park; Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos; Resumo: A própolis é uma resina de coloração e consistência variada coletada por abelhas da espécie Apis mellifera de diversas partes da planta como brotos, botões florais e exsudados resinosos, sendo transportados para dentro da colmeia para ser utilizado como meio de defesa e vem se destacand...

Produção de lactosacarose por B-frutofuranosidase de Bacillus sp a partir de la...

Orientador: Yong Kun Park; Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos; Resumo: Foram isoladas 1341 linhagens de microrganismos a partir de amostras de solos, flores e frutos e testados quanto à produção de (3-frutofuranosidase que, além da atividade hidrolítica sobre a sacarose, catalisa a formação de lactosacarose através da transferência de resíduo de frut...