ANTIBIOSIS ASSOCIATED TO LACTOBACILLUS-AC IDOPHILUS GROWTH .1. STRAINSELECTION AND STUDY OF AN ALTERNATIVE MEDIUM USING WHEY

The production of antimicrobial compounds of some strains of Lactobaci llus acidophilus has been studied. They have been grown in whey supple mented with soy milk. It has been found that the production of compoun ds is able to inhibit the growing of both target bacteria analysed: St aphylococcus aureus and Escherichia coli. The results showed a signifi cant variation (p>0.05) depending on the strain of L. acidophilus and on the level of supplementation utilized. Most of the inhibition obser ved resulted from the presence of the lactic acid produced. It has als o been found the production of other antimicrobial compounds showing i nhibitory capacity. The action of these compounds was influenced by th e substract pH.