Growth Limiting pH, Water Activity, and Temperature for Neurotoxigenic Strains of Clostridium butyricum

Table 3

Summary of some of the studies on growth-limiting pH values for Clostridium butyricum using organic and/or inorganic acids. Values are the lowest pH values where growth or no growth observed.

Strains	Growth medium	Acidulant	Growth	No growth	Reference
Non-toxigenic	Dextrose tryptone broth	Citric	4.4	4.2	Morton et al. [27]
	Broth		5.1	ND^a	Bergère and Hermier^b [3]
	Bean sprout brine	Citric/lactic	4.0	3.7	De Jong [26]
	Pear juice^c	Citric	—	>4.8	Jakobsen and Jensen [28]
	Tomato juice	HCl	4.2	4.0	Morton et al. [27]
	Liver infusion broth	Citrate-phosphate	4.5	4.3	Gilliland and Vaughn [29]
Toxigenic	TPYG broth	HCl	4.8	4.6	Anniballi et al. [30]
	Dextrose tryptone broth	Citric	5.2	5.0	Morton et al. [27]
	Tomato juice	HCl	ND	4.8	Morton et al. [27]

aNot determined.
bInhibition of spore outgrowth.
^c𝑎_𝑤 0.990.