Table 3. Minimum inhibitory concentration (MIC) of propionic acid, benzoic acid and sorbic acid at pH conditions

Microorganism	MIC (ppm)1)
	Propionic acid			Benzoic acid			Sorbic acid
	pH 4.5	pH 5.5	pH 6.0	pH 4.5	pH 5.5	pH 6.0	pH 4.5	pH 5.5	pH 6.0
Campylobacter coli	ND	ND	50	ND	ND	200	ND	ND	100
Campylobacter jejuni	ND	ND	50	ND	ND	100	ND	ND	100
Erwinia carotovora subsp. carotovora	ND	50	50	ND	25	500	ND	50	500
Micrococcus luteus	ND	ND	50	ND	ND	500	ND	ND	500
Moraxella catarrhalis	ND	ND	75	ND	ND	200	ND	ND	100

Value was obtained from three independent experiments which showed identical results.
ND, not detected.