Análise sazonal do potencial antimicrobiano e teores de flavonoides e quinonas de extratos foliares de Aloe arborescens Mill., Xanthorrhoeaceae

Abstract

"Seasonal analysis from the antimicrobial potency and flavonoid and quinone content from Aloe arborescens Mill., Xanthorrhoeaceae, leaf extracts". This work has the objective of evaluate the antimicrobial potency and the content of flavonoids and quinones from the Aloe arborescens Mill., Xanthorrhoeaceae, leaf extracts produced in the four seasons of the year. Ethanol and chloroform extracts were prepared from the leaves, the bioassays from antimicrobial activity were developed by the macrodilution method in broth, and dosages of flavonoids and quinones were performed in the extracts. The winter chloroform extract showed the lowest CIM (128 µg/mL) on B. subtilis. The ethanol extract showed the lowest CIM (256 µg/ mL) and the lowest CMM (512 µg/mL) on K. pneumoniae. The summer and fall ethanol extracts showed low antimicrobial activity. The quinones extracts showed inhibitory activity on the tested microorganisms. The winter, spring and summer chloroform extracts showed higher antimicrobial activity compared to the fall chloroform one. The winter ethanol extract content from the leaves were higher in the hotter periods of collection (summer and fall) and the flavonoids content were similar in the four collection periods.

Evaluation of antibacterial activity from different Aloe vera (L.) Burm. F. extracts against Staphylococcus aureus strains

“…Several researches have shown that the antimicrobial efficiency of A. vera extract in the control of isolated microorganisms can cause diseases in humans such as Enterococcus faecalis, Staphylococcus aureus, Klebsiella sp., Aspergillus niger, Escherichia coli and Candida sp. (Semenoff et al, 2008;Shilpakala et al, 2009;Cardoso et al, 2010;Banu et al, 2012;Kedarnath et al, 2013;Stanley et al, 2014).…”

Phenolic Compounds and Interaction between Aminoglycosides and Natural Products of <b><i>Lygodium venustum </i></b>SW against Multiresistant Bacteria

“…Recently, many natural products have been assayed to verify not only the antibacterial activity of L. venustum but also its modulatory antibiotic activity as a strategy to combat bacterial pathogens with resistance to multiple drugs [8,9,10,11,12], due to the enhancement of resistant microorganisms and the successive loss of the drugs activities because of the bacterial mechanisms of resistance [13,14,15,16]. …”