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Appl. Environ. Microbiol., 08 1995, 2919-2924, Vol 61, No. 8
N Klijn, FF Nieuwenhof, JD Hoolwerf, CB van der Waals and AH Weerkamp
Butyric acid fermentation, the late-blowing defect in cheese, caused by the
outgrowth of clostridial spores present in raw milk, can create
considerable loss of product, especially in the production of semihard
cheeses like Gouda cheese, but also in grana and Gruyere cheeses. To
demonstrate the causative relationship between Clostridium tyrobutyricum
and late blowing in cheese, many cheesemaking experiments were performed to
provoke this defect by using spores from several strains of the major
dairy-related clostridia. A method of PCR amplification of a part of the
16S rRNA gene in combination with hybridization with species-specific DNA
probes was developed to allow the specific detection of clostridial
sequences in DNAs extracted from cheeses. The sensitivity was increased by
using nested PCR. Late blowing was provoked in experimental cheeses with 28
of the 32 C. tyrobutyricum strains tested, whereas experimental cheeses
made with spores from C. beijerinckii, C. butyricum, and C. sporogenes
showed no signs of butyric acid fermentation. In all experimental and
commercial cheeses with obvious signs of late blowing, DNA from C.
tyrobutyricum was detected; in some cheeses, signals for C. beijerinckii
were also found. It was concluded that only C. tyrobutyricum strains are
able to cause butyric acid fermentation in cheese.
Copyright © 1995, American Society for Microbiology
Identification of Clostridium tyrobutyricum as the causative agent of late blowing in cheese by species-specific PCR amplification
Netherlands Institute for Dairy Research (NIZO), Ede.
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