This study investigated the inhibitory effects of Lactobacillus casei AST18 as a biocontrol agent on fungi
spoilage in yogurt. In a yogurt preservation period experiment and mould-proof accelerated testing at
4 C, the addition of 2% (v/v) L. casei AST18 in yogurt completely inhibited mould growth; mould growth
was significantly delayed and spore germination was inhibited at 30 C. The addition of L. casei AST18
improved the quantity of Lactobacillus, but the number of Streptococcus lactis in 2% AST18-added yogurt
decreased by 1.0 Log (cfu/mL) compared with that in the blank group. L. casei AST18 exerted no significant
influence on viscosity, water holding capacity, sensory quality, pH and titratable acidity. The postacidification
effect of L. casei AST18 was low. L. casei AST18 conspicuously inhibited the growth of filamentous
fungi. Therefore, L. casei AST18 can be used as a bioprotective culture in yogurt to prevent fungal
growth and extend shelf life.
This study investigated the inhibitory effects of Lactobacillus casei AST18 as a biocontrol agent on fungispoilage in yogurt. In a yogurt preservation period experiment and mould-proof accelerated testing at4 C, the addition of 2% (v/v) L. casei AST18 in yogurt completely inhibited mould growth; mould growthwas significantly delayed and spore germination was inhibited at 30 C. The addition of L. casei AST18improved the quantity of Lactobacillus, but the number of Streptococcus lactis in 2% AST18-added yogurtdecreased by 1.0 Log (cfu/mL) compared with that in the blank group. L. casei AST18 exerted no significantinfluence on viscosity, water holding capacity, sensory quality, pH and titratable acidity. The postacidificationeffect of L. casei AST18 was low. L. casei AST18 conspicuously inhibited the growth of filamentousfungi. Therefore, L. casei AST18 can be used as a bioprotective culture in yogurt to prevent fungalgrowth and extend shelf life.
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