Contamination pathways of spore-forming bacteria in a vegetable cannery.

Abstract:

:Spoilage of low-acid canned food during prolonged storage at high temperatures is caused by heat resistant thermophilic spores of strict or facultative bacteria. Here, we performed a bacterial survey over two consecutive years on the processing line of a French company manufacturing canned mixed green peas and carrots. In total, 341 samples were collected, including raw vegetables, green peas and carrots at different steps of processing, cover brine, and process environment samples. Thermophilic and highly-heat-resistant thermophilic spores growing anaerobically were counted. During vegetable preparation, anaerobic spore counts were significantly decreased, and tended to remain unchanged further downstream in the process. Large variation of spore levels in products immediately before the sterilization process could be explained by occasionally high spore levels on surfaces and in debris of vegetable combined with long residence times in conditions suitable for growth and sporulation. Vegetable processing was also associated with an increase in the prevalence of highly-heat-resistant species, probably due to cross-contamination of peas via blanching water. Geobacillus stearothermophilus M13-PCR genotypic profiling on 112 isolates determined 23 profile-types and confirmed process-driven cross-contamination. Taken together, these findings clarify the scheme of contamination pathway by thermophilic spore-forming bacteria in a vegetable cannery.

journal_name

Int J Food Microbiol

authors

Durand L,Planchon S,Guinebretiere MH,André S,Carlin F,Remize F

doi

10.1016/j.ijfoodmicro.2015.02.019

subject

Has Abstract

pub_date

2015-06-02 00:00:00

pages

10-9

eissn

0168-1605

issn

1879-3460

pii

S0168-1605(15)00098-7

journal_volume

202

pub_type

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