TABLE 1.

MICs for plantaricin peptides^a

Indicator strain	Peptide MIC (nM) of:
	PlnJK	PlnEF	PlnA 22-mer	PlnA 26-mer
Pediococcus pentosaceus Pac 1.0	50	5	100	100
Lactobacillus plantarum 965	0.1	7	500	300
Lactobacillus casei subsp. casei NCDO 161	≥400	20	250	250
Lactobacillus casei NCDO 2713	≥400	150	≥6,000	≥6,000
Lactobacillus sake NCDO 2714	50	4	250	60
Lactobacillus viridescens NCDO 1655	5	2	50	20
Pediococcus pentosaceus NCDO 990	≥400	30	≥6,000	≥6,000
Carnobacterium piscicola UI49	≥400	≥400	≥6,000	≥6,000
Lactobacillus plantarum UI50	≥400	≥400	≥6,000	≥6,000
Lactobacillus sake 706	≥400	100	≥1,000	≥500
Pediococcus acidilactici CH	≥400	10	NTb	≥500
Lactobacillus curvatus 89	≥400	5	NT	≥500

^aBacteriocin activity was determined as described previously (22). The values are the concentrations of peptides that caused 50% growth inhibition of the indicator strains. The peptides making up PlnJK and PlnEF were mixed at a 1:1 ratio. PlnN was tested against all indicator strains, but no antagonistic activity was detected at any concentration (the highest concentration tested was approximately 1 μM). The PlnA 23-mer peptide was tested against L. plantarum 965 and exhibited antagonistic activity similar to that of the PlnA 22-mer peptide. 

^bNT, not tested.