Comparative Study of Different Extracting Methods for Antimicrobial Substances from Pineapple Peel

The active substances of pineapple peel was extracted by the methods of uitrasonic-assisted water extract, organic solvent extract and uitrasonic-assisted organic solvent extract, and its antimicrobial effect was detected by measuring the inhibition zones of Escherichia coli, Staphylococcus aureus, Bacillus subtilis, Aspergillus niger and Penicillium citrinum. The results showed that the extract of pineapple peel had a certain inhibitory effect, and its antimicrobial effects were different with differences of extracting methods and strains. The antimicrobial substance of pineapple peel had good stability under the meta-acid conditions, UV and moist heat sterillization.