Abstract
Late blowing defect affects hard cheese production and Clostridium tyrobutyricum appears as the primary
cause of this spoilage. Our aimwas to develop a quantitative TaqMan real-time PCR method to detect this
agent in different matrices along the whole agro-dairy chain, using specific primers targeting the
phosphotransacetylase gene (pta). The optimised assay appeared to be sensitive and specific to quantify
C. tyrobutyricum. Results demonstrated a 100% efficiency with low numbers of cells and spores (approx.
14 mL 1 or g 1) also detected in broth and in milk matrix artificially contaminated with C. tyrobutyricum.
Combined with a DNA extraction method optimised to lyse both cells and spores, our method is suitable
for silage and hay, faeces, milk and hard cheese samples without any enrichment. The molecular
quantification by qPCR was found to be precise and could be used for the rapid determination of the
presence of C. tyrobutyricum.
Lingua originale | English |
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pagine (da-a) | 75-82 |
Numero di pagine | 8 |
Rivista | International Dairy Journal |
Volume | 33 |
Stato di pubblicazione | Pubblicato - 2013 |
Keywords
- Clostridium tyrobutyricum
- Late blowing
- Real time
- cheese
- milk
- phosphotransacetylase