Antimicrobial activity of the polyphenolic fractions derived from Grewia asiatica, Eugenia jambolana and Carissa carandas

International Journal of Food Science and Technology - Tập 46 Số 2 - Trang 250-256 - 2011
Rahmanullah Siddiqi1, Shahina Naz1, Samia Ahmad2, Syed Asad Sayeed1
1Department of Food Science & Technology, University of Karachi, Karachi-75270, Pakistan
2Department of Microbiology, University of Karachi, Karachi-75270, Pakistan.

Tóm tắt

SummaryCrude methanolic extracts from Grewia asiatica, Eugenia jambolana and Carissa carandas were separated into four major fractions viz. phenolic acids, flavanols, flavonols and anthocyanins which were then analysed for their total phenolic, flavonoid contents, and antimicrobial effects. In addition, anthocyanin fraction was also analysed for total anthocyanins, total colour and polymeric pigments. Total phenolics and flavonoids were highest in the fractions from E. jambolana and lowest in C. carandas, the order being phenolic acid > flavanols > flavonols > anthocyanins in all fruits. All fractions showed significant antibacterial activity except anthocyanin. Being the most active, phenolic acid fractions were also tested for their antifungal activity, the fractions of C. carandas and G. asiatica substantially inhibited all the tested fungal species. These results are being reported for the first time.

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