Heat treatments to enhance the safety of mung bean seeds

Journal of Food Protection
Haijing HuRandy W Worobo

Abstract

Salmonella enterica serovars and Escherichia coli O157:H7 have been associated with contaminated seed sprout outbreaks. The majority of these outbreaks have been traced to sprout seeds contaminated with low levels of pathogens. E. coli O157:H7 strains can grow an average of 2.3 log CFU/g over 2 days during seed germination, and Salmonella can achieve an average growth of 3.7 log CFU/g. Therefore, it is important to find an effective method to reduce possible pathogenic bacterial populations on the seeds prior to sprouting. Our objective was to assess the effectiveness of various dry heat treatments on reducing E. coli O157:H7 and Salmonella populations on mung beans intended for sprout production and to determine the effect of these treatments on seed germination. Mung beans were inoculated with five-strain cocktails of E. coli O157:H7 and of Salmonella serovars harboring the green fluorescent protein gene and then air dried overnight. Heat treatments were performed by incubating the seeds at 55 degrees C for various periods of time. Heat-treated seeds were then assessed for the efficacy of the heat treatment and the effects of heat treatment on germination rates. After inoculation and drying, 6 log CFU/g E. coli O157:H7 and 4 ...Continue Reading

References

Oct 8, 1999·Emerging Infectious Diseases·P J TaorminaL Slutsker
Jul 27, 2001·Letters in Applied Microbiology·D StewartM Tortorello
Jun 1, 2002·Applied and Environmental Microbiology·A O CharkowskiR E Mandrell
Sep 27, 2002·Applied and Environmental Microbiology·J D BarakA O Charkowski

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Citations

Nov 1, 2007·Journal of Food Protection·Marilyn C Erickson, Michael P Doyle
Aug 24, 2010·Applied and Environmental Microbiology·Armelle DarrasseMarie-Agnès Jacques
Mar 8, 2013·Journal of Food Science·Hongliu DingMichelle A Smith
Apr 10, 2010·Journal of Food Protection·M L BariS Kawamoto
Aug 10, 2007·Journal of Food Protection·Guoping FengRandy W Worobo
Jul 31, 2014·Foodborne Pathogens and Disease·Amy M DechetBarbara E Mahon
Dec 3, 2013·Journal of Food Protection·Adi Md SikinSyed S H Rizvi

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