Influence of aflatoxin B1 on gas production by lactic acid bacteria.
The main characteristic of homofermentative lactic acid bacteria is that they do not produce gas from glucose and other sugars. However, in these experiments Lactobacillus casei, Lb. plantarum and Streptococcus lactis in broth media with glucose, galactose, lactose and sucrose, and aflatoxin B1 produces acid and also a significant amount of gas. In the control media without aflatoxin, these bacteria did not produce gas. The data suggest that lactic acid bacteria, known until now as homofermentative, become heterofermentative because of the influence of aflatoxin B1. The results of these investigations are of practical value because they may explain the defect of cheese "blowing," which can appear in Trapist cheese vacuum packed in foil. This type of unusual "blowing" occurs approximately one month after cheese manufacture. This defect can be characterized by very large holes and cracks inside the cheese. The flavor is similar to that of young cheese, which can be very undesirable for a ripened, Trapist, aged cheese.
Sutić
M
M
Department of Microbiology, Faculty of Agriculture, University of Belgrade, Zemun, Yugolsavia.
Banina
A
A
D016604:Aflatoxin B1; D000348:Aflatoxins / Q000494:pharmacology*; D002273:Carcinogens / Q000494:pharmacology*; D002611:Cheese; D005285:Fermentation; D005511:Food Handling; D005740:Gases / Q000032:analysis; D005947:Glucose / Q000378:metabolism; D007773:Lactates / Q000378:metabolism*; D007778:Lactobacillus / Q000187:drug effects / Q000378:metabolism*; D007780:Lacticaseibacillus casei / Q000187:drug effects / Q000378:metabolism*; D013294:Lactococcus lactis / Q000187:drug effects / Q000378:metabolism*; D007785:Lactose / Q000378:metabolism; D013395:Sucrose / Q000378:metabolism
D000348:Aflatoxins; D002273:Carcinogens; D005740:Gases; D007773:Lactates; D013395:Sucrose; D016604:Aflatoxin B1; D005947:Glucose; D007785:Lactose