Screening and identification of β-galactosidase-producing
This experiment isolated 4 different lactobacillus from three yogurts in the market and one can produce bacteriocin that named as S1.Phenotypic analyses including morphology and physiology charac teristics were carried out.By making a comprehensive view on all the results of taxonomy,the strain was identified as Lactococcus lactis.The supernatant of S1 could strongly inhibit indicator strains after excluded inhibitive effect of H2O2 and organic acid,which could be classed as bacteriocin.The bacteriocin which S1 produces has strong inhibitory effect to Escherichia coli,and the range of inhibitory is very different to Nisin.