Seasonal variation in the production of secondary metabolites and antimicrobial activity of two plant species used in Brazilian traditional medicine
AFRICAN JOURNAL OF BIOTECHNOLOGYPublished 20 February 2013Open access
Thiago Pereira Chaves, Cleildo P. Santana, Germano Véras, Deysiane Oliveira Brandão, Ana Cláudia, Divaneide Silva De Medeiros
Citations43
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TL;DR
The results show that the chemical composition of the extracts from P. marginatum and G. gracilliflora exhibits seasonal variation, with the first plant showing moderate antimicrobial activity.
Abstract
Guapira graciliflora and Pseudobombax marginatum are two species used in the treatment of various diseases in traditional medicine of the Brazilian semiarid region, but no studies assessing their phytochemical and pharmacological properties have been reported. This study aimed to evaluate seasonal variation in the production of secondary metabolites and antimicrobial activity of these plants. The broth microdilution test was used against pathogenic microorganisms to evaluate the antimicrobial activity. The content of total polyphenols and flavonoids was determined by ultra violet (UV) spectrophotometry using gallic acid and quercetin as standards respectively. The concentration of polyphenols was higher in winter for P. marginatum and in summer for G. graciliflora , while for flavonoids the opposite occurred. Regarding the antimicrobial activity, only P. marginatum showed inhibition against seven tested strains and antibiosis against four, with variation in the minimum inhibitory concentration (MIC) and minimum microbicide concentration (MMC) between the two seasons. G. graciliflora showed no activity. The results show that the chemical composition of the extracts from P. marginatum and G. gracilliflora exhibits seasonal variation, with the first plant showing moderate antimicrobial activity. Keywords : Seasonal variation, phenolic compounds, medicinal plants, Gapira graciliflora, Pseudobombax marginatum African Journal of Biotechnology Vol. 12(8), pp. 847-853
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