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Meat Science
Vol. 96, No.
2, 2014; Pages: 948–955

Effective survival of immobilized Lactobacillus casei during ripening and heat treatment of probiotic dry-fermented sausages and investigation of the microbial dynamics

Marianthi Sidira, Athanasios Karapetsas, Alex Galanis, Maria Kanellaki, Yiannis Kourkoutas

Food Biotechnology Group, Section of Analytical Environmental and Applied Chemistry, Department of Chemistry, University of Patras, GR-26500 Patras, Greece.

Abstract

The aim was the assessment of immobilized Lactobacillus casei ATCC 393 on wheat in the production of probiotic dry-fermented sausages and the investigation of the microbial dynamics. For comparison, sausages containing either free L. casei ATCC 393 or no starter culture were also prepared. During ripening, the numbers of lactobacilli exceeded 7 log cfu/g, while a drastic decrease was observed in enterobacteria, staphylococci and pseudomonas counts. Microbial diversity was further studied applying a PCR-DGGE protocol. Members of LactobacillusLeuconostocLactococcusCarnobacterium,BrochothrixBacillus and Debaryomyces were the main microbial populations detected. Microbiological and strain-specific multiplex PCR analysis confirmed that the levels of L. casei ATCC 393 in the samples after 66 days of ripening were above the minimum concentration for conferring a probiotic effect (≥ 6 log cfu/g). However, after heat treatment, this strain was detected at the above levels, only in sausages containing immobilized cells.

Keywords: Probiotics; Dry-fermented sausages; L. casei ATCC 393; Multiplex PCR; PCR-DGGE.


 
 
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