Results: 146

Antifungal activity of the essential oil of cymbopogon citratus (DC) stapf: an in vitro study

J. oral res. (Impresa); 6 (12), 2017
Aim. to evaluate the antifungal potential of the essential oil of cymbopogon citratus by determining the minimum inhibitory concentration (MIC) and the minimum fungicidal concentration (MFC) for candida albicans (ATCC 90029), candida albicans (CBS 562), candida tropicalis (ATCC 705) and candida tropicali...

Bioethanol production with different dosages of the commercial Acrylamide polymer compared to a Bioextract in clarifying sugarcane juice

An. acad. bras. ciênc; 89 (4), 2017
ABSTRACT One of the most important steps is to clarify the juice, which are added synthetic polymer acrylamide base, aiming the fast settling of impurities present in the juice. However, this input is expensive and may have carcinogenic and neurotoxic actions to humans. The search for new natural floccul...

Repellent activity of essential oils extracted from five Artemisia species against Tribolium castaneum (Coleoptera: Tenebrionidae)

Artemisia genus (family Asteraceae) has been widely used as medicines and cosmetic. The chemical compositions of essential oils extracted from five Artemisia species (A. anethoides, A. giraldii, A. roxburghiana, A. rubripes and A. sacrorum) were analyzed and the repellent activities of five essential oil...

Clusia criuva Cambess. (Clusiaceae): anatomical characterization, chemical prospecting and antioxidant activity

An. acad. bras. ciênc; 89 (3), 2017
ABSTRACT This study aims the anatomical description and chemical characterization of aerial parts of Clusia criuva Cambess., Clusiaceae in addition to the evaluation of the antioxidant activity of crude extracts, correlated to the flavonoid content. The morphological characterization was performed using ...

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 ...

Profiling of antioxidant potential and phytoconstituents of Plantago coronopus

Braz. j. biol; 77 (3), 2017
Abstract The halophyte species Plantago coronopus has several described ethnomedicinal uses, but few reported biological activities. This work carried out for the first time a comparative analysis of P. coronopus organs in terms of phenolic composition and antioxidant activity of organic and water extrac...

Special metabolites isolated from Urochloa humidicola (Poaceae)

An. acad. bras. ciênc; 89 (2), 2017
ABSTRACT This study aims to identify special metabolites in polar extracts from Urochloa humidicola (synonym Brachiaria humidicola) that have allelopathic effects and induce secondary photosensitization in ruminants. The compounds were isolated and identified via chromatographic and spectroscopic techniq...

Psychotria viridis: Chemical constituents from leaves and biological properties

An. acad. bras. ciênc; 89 (2), 2017
ABSTRACT The phytochemical study of hexane, chloroform and methanol extracts from leaves of Psychotria viridis resulted in the identification of: the pentacyclic triterpenes, ursolic and oleanolic acid; the steroids, 24-methylene-cycloartanol, stigmasterol and β-sitosterol; the glycosylated steroids...

N deposition affects allelopathic potential of Amaranthus retroflexus with different distribution regions

An. acad. bras. ciênc; 89 (2), 2017
ABSTRACT This study aims to determine the allelopathic potential of Amaranthus retroflexus (Ar) with different climatic zones on seed germination and growth of A. tricolor (At) treated with a gradient N addition. Ar leaf extracts only displayed significantly allelopathic potential on the underground grow...

Use of GC/MS to identify chemical constituents and cytotoxic activity of the leaves of Phoradendron mucronatum and Phoradendron microphyllum (Viscaceae)

An. acad. bras. ciênc; 89 (2), 2017
ABSTRACT Phoradendron mucronatum and P. microphyllum are plants that found in tropical and subtropical areas, used in traditional medicine and popularly known as mistle-thrush. The aim of this study was to identify the chemical constituents of different leaf extracts from P. mucronatum and P. microphyllu...