Results: 11

Optimization of ultrasound - assisted extraction of phenolic compounds and flavonoids from Hortia oreadica leaf

Hortia oreadica is indiscriminated used by people from Cerrado. However, vegetable raw material quality is decisive in obtaining inter mediate and final products. So, this study aimed to establish quality parameters of H. oreadica . For this, we performed the phytochemical screeni...

Chemical constituents of Calotropis procera latex and ultrastructural effects on Haemonchus contortus

Abstract This study aimed to evaluate the anthelmintic and ultrastructural effects of Calotropis procera latex on Haemonchus contortus. C. procera latex was twice centrifuged at 10,000×g and dialyzed to obtain a fraction rich in proteins, named LP (latex protein), and at 3,000 rpm to obtain a fraction r...

Effect of irrigation at critical stages on the phenology of flowering and fruiting of the cactus Opuntia spp

Braz. j. biol; 78 (4), 2018
Abstract This paper briefly reports some effects of irrigations at two critical periods on the phenology of three varieties of cactus pear cultivated in Agadir area: the spineless varieties 'Aissa' and 'Moussa' and the thorny one 'Achefri'. In the first year experiments (2010-2011) treatments of irrigati...

Phenolic content and antibacterial activity of extracts of Hamelia patens obtained by different extraction methods

Braz. j. microbiol; 49 (3), 2018
Abstract Hamelia patens, is a plant traditionally used to treat a variety of conditions among the Huastec people of Mexico. The objective of this study is to characterize the phenolic content and critically examine the antimicrobial activity of leaf extracts H. patens, obtained by maceration, Soxhlet and...

Foliar phenolic compounds of ten wild species of Verbenacea as antioxidants and specific chemomarkers

Braz. j. biol; 78 (1), 2018
Abstract The family Verbenaceae hosts important species used in traditional medicine of many countries. The taxonomic controversies concerning the specific delimitation of several of its species make it difficult to guarantee the botanical origin of herbal preparations based on species of this family. To...

Proteic and phenolics compounds contents in Bacupari callus cultured with glutamine and nitrogen sources

Braz. j. biol; 78 (1), 2018
Abstract In this study was evaluated the influence of glutamine supplementation on the endogenous content of amino acids, proteins, total phenolics, flavonoids and proanthocyanidins in Bacupari callus. The explants were inoculated in MS medium, MS with half concentration of the nitrogen salts (MS½) and ...

New seminal variety of Stevia rebaudiana: Obtaining fractions with high antioxidant potential of leaves

An. acad. bras. ciênc; 89 (3), 2017
ABSTRACT The aim of this study was to determine the composition and antioxidant potential of leaves of a new variety of Stevia rebaudiana (Stevia UEM-13). Stevia leaves of UEM-13 contain rebaudioside A as the main glycoside, while most wild Stevia plants contain stevioside. Furthermore can be multiplied ...

A potent larvicidal agent against Aedes aegypti mosquito from cardanol

An. acad. bras. ciênc; 89 (1,supl), 2017
ABSTRACT Cardanol is a constituent of Cashew Nut Shell Liquid that presents larvicidal activity against Aedes aegypti. The isolation of cardanol is somewhat troublesome, however, in this work we describe an efficient and inexpensive method to obtain it as a pure material. The compound was used as startin...

Role of pH on antioxidants production by Spirulina (Arthrospira) platensis

Braz. j. microbiol; 47 (2), 2016
Abstract Algae can tolerate a broad range of growing conditions but extreme conditions may lead to the generation of highly dangerous reactive oxygen species (ROS), which may cause the deterioration of cell metabolism and damage cellular components. The antioxidants produced by algae alleviate the harmfu...

Comparison of different methods for total RNA extraction from sclerotia of Rhizoctonia solani

Electron. j. biotechnol; 17 (1), 2014
Background Rhizoctonia solani (teleomorph: Thanatephorus cucumeris) is one of the most important pathogens of rice (Oryza sativa L.) that causes severe yield losses in all rice-growing regions. Sclerotia, formed from the aggregation of hyphae, are important structures in the life cycles of R. solani and ...