RESUMO
An updated review on the biological activity of Tridax procumbens is presented. A detailed biological screening comprised of gram-positive and gram-negative bacteria, yeasts and fungi using crude extracts of this plant was undertaken. The n-hexane extract of the flowers showed activity against Escherichia coli. The same extract of the whole aerial parts was active against Mycobacterium smegmatis, Escherichia coli, Salmonella group C and Salmonella paratyphi. The ethyl-acetate extract of the flowers was active against Bacillus cereus and Klebsiella sp. The aerial parts extract also showed activity only against Mycobacterium smegmatis and Staphylococcus aureus, while the aqueous extract showed no antimicrobial activity. None of the tested extracts was active against the yeasts, Candida albicans, Candida tropicalis and Rhodotorula rubra; or the fungi: Aspergillus flavus, Aspergillus niger, Mucor sp. and Trichophyton rubrum.
Assuntos
Antibacterianos/farmacologia , Asteraceae , Bactérias Gram-Negativas/efeitos dos fármacos , Bactérias Gram-Positivas/efeitos dos fármacos , Humanos , Testes de Sensibilidade Microbiana , Extratos Vegetais/farmacologia , Plantas MedicinaisRESUMO
A biological screening of activity against Gram-positive and Gram-negative bacteria, yeasts, and fungi of crude extracts from Wedelia trilobata is reported. The n-hexane extract showed antibacterial activity against Bacillus subtilis, Mycobacterium smegmatis, Staphylococcus aureus, and Staphylococcus epidermidis (Gram-positive bacteria); along with Proteus vulgaris, Pseudomonas aeruginosa, Salmonella group C, Salmonella paratyphi, and Shigella sonnei (Gram-negative bacteria). The ethyl acetate extract was active only against Salmonella group C; and the aqueous extract was inactive against the tested bacteria. None of the tested extracts showed biological activity against the yeasts (Candida albicans, Candida tropicalis, Rhodotorula rubra) or the fungi (Aspergillus flavus, Aspergillus niger, Mucor sp., Trichophyton rubrum).
Assuntos
Anti-Infecciosos/farmacologia , Asteraceae/química , Extratos Vegetais/farmacologia , Antibacterianos , Fungos/efeitos dos fármacos , Bactérias Gram-Negativas/efeitos dos fármacos , Bactérias Gram-Positivas/efeitos dos fármacos , Testes de Sensibilidade MicrobianaRESUMO
The separation and the simultaneous determination of beta-carotene, cantaxanthin, lutein, violaxanthin and neoxanthin was accomplished using thin-layer chromatography on Chromarods, flame ionization detection and a two-stage development technique. Data were transformed through an unweighted straight-line regression of the logarithm of peak area ratios on the logarithm of the mass ratios. The determinations are highly reproducible and all statistical estimates are highly significant. The linear concentration range for each compounds is reported. No evidence of degradation of the carotenoids during the analyses was found. Up to ten samples can be analysed simultaneously in less than 2 h.
Assuntos
Carotenoides/análise , Cromatografia em Camada Fina , Ionização de Chama , Análise de Regressão , SolventesRESUMO
Las hojas de platano fueron evaluadas como materia prima para la elaboracion de un concentrado proteinico (LPC).La hojas contienen, en base seca, 11% de cenizas, 18% de proteina cruda, 9% de grasas totales, 30% de fibra cruda y 32% de carbohidratos.Las proteinas de las hojas son deficientes en los amino acidos sulfurados. El alto contenido de acidos grasos polinsaturados y de compuestos fenolicos, podrian conllevar serios problemas durante el proceso de preparacion del concentrado y podria asimismo influir negativamente sobre la estabilidad del producto final
Assuntos
Extratos Vegetais , Plantago , Proteínas de Vegetais ComestíveisRESUMO
Las proteinas de las hojas de platano fueron extraidas usando una solucion tampon y luego fueron precipitadas a pH acido. Como condiciones optimas para la preparacion del concentrado proteinico se obtuvieron los siguientes valores: pH de extraccion 11; temperatura de extraccion: 30 graus C; duracion de la extraccion: 30 minutos; pH de precipitacion: 3,5 y numero de extracciones: una. El concentrado proteinico preparado bajo las condiciones optimas de extraccion presento la siguiente composicion: 50,7% de proteinas y 39% de grasa total. Basandose en el perfil de aminoacidos y considerando la alta concentracion de acidos grasos polisaturados, puede proponerse el concentrado como un buen suplemento para dietas deficientes en proteinas Un estudio de las propiedades funcionales del concentrado demuestra que puede ser utilizado en la industria de alimentos para facilitar la formacion de emulsiones, suspenciones o como un agente espesante