乳杆菌抑制黄曲霉孢子萌发的研究

为探讨乳杆菌抑制黄曲霉孢子萌发的可能机制 ,在乳杆菌培养液、乳杆菌培养液的上清液和乳杆菌的细胞悬浮液中接种一定量的黄曲霉孢子 ,每隔 4h分别取少量液体在PDA平板上进行霉菌计数 ,直到 30h。 2 8℃培养 72h后计数萌发的霉菌孢子。结果表明 :只有乳杆菌培养液组对黄曲霉孢子萌发有显著的抑制作用 ,说明乳杆菌抑制黄曲霉孢子萌发的可能机制是低pH值 ,乳杆菌的代谢产物与微生物间竞争多因素协同作用的结果。

Inhibition of Lactobacillus Species on the germination of Aspergillus flavus spore

Actively growing Lactobacillus plantarum CGMCC 1 1856 cells totally inhibited the germination of mold spores. Cell-free supernatant broth from the fermentation of Lactobacillus plantarum could not destroy the viability of mold spore. While the pH of the culture broth and supernatant were about 4 0, and the acidification of non-fermented broth to pH 4 0 with lactic acid could not cause a similar inhibition on spore germination. This experiment discounted the possibility that the inhibitory effect on mold growth was due to the lactic acid produced by Lactobacillus, and suggested that the effect was because of both low pH and microbial competition.