Antibacterial activity of some fruit-peel extracts

Abstract

This research studied about antibacterial activity and the total phenolic content of five kinds of fruit
peels, such as durian, mangosteen, orange, banana, and betel nut, extracted by using hot water, 95% ethanol and
acetone. The result showed that acetone extract of mangosteen peels had the highest antibacterial activity against
all bacteria tested (Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Salmonella typhimurium) with
the MIC less than 195.7 mg/ml. The next was followed by the acetone extract of durian peels with the MIC of
373 and 273 mg/ml against B. subtilis and S. typhimurium, respectively, and the MIC of 2984 mg/ml against S.
aureus and E. coli. All acetone extracts have the highest total phenolic content and the antibacterial activity was
related to the total phenolic content. Furthermore, Gram positive bacteria were more sensitive to all fruit-peel
extracts than Gram negative bacteria.