Antimicrobial Activities of Crude Extracts from Pomelo Peel of Khao-nahm-peung and Khao-paen Varieties
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Abstract
This study aimed to evaluate crude extracts from pomelo peels of Khao-nahm-peung and Khaopaen varieties for their antimicrobial activities against tested pathogenic and food spoilage microorganisms, Staphylococcus aureus TISTR 118, Bacillus cereus TISTR 5040, Bacillus subtilis TISTR 6633, Listeria monocytogenes DMST 17256, Escherichia coli DMST 4212, Salmonella Typhimurium DMST 0562, Pseudomonas aeruginosa ATCC 27853, Saccharomyces cerevisiae TISTR 5019 and Zygosaccharomyces rouxii TISTR 5044. Susceptibility test by disk diffusion method revealed that crude hexane extract did not inhibit any investigated bacteria, while the crude hexane extract of flavedo of Khao-nahm-peung variety inhibited the tested yeasts.The crude ethyl acetate extract of flavedo inhibited the growth of Gram-positive bacteria and yeasts but this crude extract did not show any inhibition of the tested Gram-negative bacteria. The crude ethanol extract had no antimicrobial activities against any investigated microorganisms at specified concentration in this study.
Keywords: antimicrobial activity, crude extracts, pomelo peel, Khao-nahm-peung, Khao-paen
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