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- W2363587145 abstract "Lactic acid bacteria can produce inhibitory substances,such as lactic acid,hydrogen peroxide,bacteriocin and bacteriocin-like substance,and therefore can be used as probiotics to modulate the composition of gut microbiota and maintain the health of the host.The most rapid and experimentally simplest means for evaluating potential probiotic effects was to determine the inhibitory activity of the cell-free culture of lactic acid bacteria on pathogenic bacteria.In this study,two strains of lactic acid bacteria,MM1 and MM4,were isolated from the intestine of orange-spotted grouper(Epinephelus coioides).Lactic acid production and antibacterial activity of two strains were studied in vitro.The results showed that MM1 exhibited more rapid production of lactic acid than MM4;and the amount of lactic acid produced by MM1 was significantly larger than that by MM4 in the whole incubation period(P 0.05),but the pH values in the cultures of two strains were similar.MM1 and MM4 exhibited strong inhibitory activity against the pathogenic gram-negative Vibrio metschnikovi and V.harveyi,and gram-positive Staphylococcus aureus.However,lactic acid did not contribute to the inhibitory activity of the two strains.After 2 h of treatment with catalase,the inhibitory activity of MM1 and MM4 against V.metschnikovi and V.harveyi decreased significantly(P 0.05),while the inhibitory activity against S.aureus was only affected slightly,suggesting,in addition to hydrogen peroxide,other inhibitory substances might be produced by the two strains.After 15min of heat treatments at 60℃,80℃ and 100℃,the residual inhibitory activity of MM1 and MM4 were above 86.0%,60.2% and 42.9%,respectively,indicating the inhibitory substances secreted by the two strains were heat stable.The residual inhibition activity of MM1 and MM4 were more than 70.0% after being treated with pepsin,trypsin and protease K,revealing that the inhibitory substances secreted by the two strains were partially sensitive to protease.Therefore,the inhibitory substances might be bacteriocin-like as they were heat stable and partially sensitive to protease,and could strongly inhibit both gram-negative and gram-positive pathogens.In summary,MM1 and MM4 can produce hydrogen peroxide and bacteriocin-like substances,and have showed strong inhibitory activity against gram-negative and gram-positive pathogens,suggesting that the two stains might have the potential to function as probiotics in aquaculture." @default.
- W2363587145 created "2016-06-24" @default.
- W2363587145 creator A5075789873 @default.
- W2363587145 date "2010-01-01" @default.
- W2363587145 modified "2023-09-23" @default.
- W2363587145 title "ANTAGONISTIC PROPERTY OF LACTIC ACID BACTERIA MM1 AND MM4 ISOLATED FROM THE INTESTINE OF GROUPER EPINEPHELUS COIOIDES" @default.
- W2363587145 hasPublicationYear "2010" @default.
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