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Combined effect of pH and water activity on inhibition of spore germination of Bacillus cereus
( Jung Whan Chon ),( Joung Ki Lee ),( Ji Yeon Hyeon ),( Jun Ho Park ),( Dong Hveon Kim ),( Hong Seok Kim ),( Kwang Young Song ),( Kim Ho Seo ) 한국예방수의학회(구 한국수의공중보건학회) 2012 예방수의학회지 Vol.36 No.2
The effect of pt-I values of 6.5, 6.0, 5.0, and 4.0 on spore germination of Bacillus cereus (B. cereus) was investigated at water activity (a%) values of 0.98, 0.96, 0.94, and 0.90 in a controlled medium at 30°C for 7 days. The best condition for germination of spores of B. cereus was observed at pH 6.5 with a, 0.98. No matter what combination of a and pH is used, a complete inhibition of spore germination was achieved at either a,.. value of 0.90 or pH value of 4.0. Spore germination was also delayed or inhibited at a.... 0.98 with pH 4.0, a,, 0.96 with pH 5.0, and a 0.94 with pH 6.5, 6.0, 5.0, or 4.0. The results indicate that the combined inhibitory effects of pH and water activity on the germination of B. cereus spores in controlled medium could be applied to food preservation.