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Microbial composition of spoiled industrial-scale Sichuan paocai and characteristics of the microorganisms responsible for paocai spoilage.
International Journal of Food Microbiology 2018 June 21
The microorganisms of spoiled industrial-scale Sichuan paocai (ISSP) were isolated using six types of media, and 16S rRNA and 26S rRNA gene sequence analyses were used to identify the isolates. Meanwhile, the microbial composition was investigated using a culture-independent method through 16S rRNA and ITS sequencing on an Illumina MiSeq platform. The results obtained by these two methods were compared. Furthermore, characteristics of the isolated microorganisms responsible for ISSP spoilage were studied. Sixty-two strains belonging to twenty-three species, including three ammonia-producing genera, two gas-producing genera, two pectinase-producing genera, two cellulase-producing genera, three film-producing genera and one slime-producing genus, were isolated. Lactobacillus, Bacillus, Debaryomyces and Kazachstania were the dominant genera as confirmed through both culture-dependent and culture-independent methods. Bacillus, Paenibacillus, Pichia and Debaryomyces could be the main microorganisms responsible for ISSP spoilage. Bac. licheniformis was closely correlated with the off-flavour of ISSP. Pae. peoriae, Bac. stratosphericus, Bac. toyonensis and Bac. cereus were responsible for tissue softening, and Bac. subtilis, Bac. methylotrophicus, Pic. membranifaciens and Deb. hansenii caused film formation.
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