Antibacterial Activity of Aqueous Extracts of Malus Domestica Against Some Bacterial Pathogens

Abstract

Bin Zhao, Xia Jiang and Jinming Cao

The present study was designed to evaluate the antibacterial activity of aqueous extracts of Malus domestica (peel and pomace) against food-borne pathogens (Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Enterococcus feacalis). Extraction conditions (temperature and time) were optimized to obtain maximum yield by using response surface methodology. Antibacterial potentials of the extracts were examined through disc inhibition zone technique and the results were compared with commercial antibiotic. Results Indicated that maximum antibacterial activity was shown by peel extract against Staphylococcus aureus with average zone of inhibition 19.25±0.89 mm while pomace 12.75±0.71 mm. Maximum recovery for water soluble compounds from peel was obtained at 70ºC followed by 90ºC and 50ºC, which was 16.33, 14.67 and 12.67%, respectively. The extraction yield was also increased but after 30 minutes. The antibacterial activities of peel extract were comparable with commercial antibiotic (20.13±0.83 mm). Escherichia coli were appeared to be the most resistant with inhibition induced by the extracts of peel 15.00±1.07 mm and pomace11.50±0.53mm.

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