Table 4.

Effects of variations on MRS broth on inhibitory activity of bacteriocinogenic lactic acid bacteria isolated from calabresa against L. monocytogenes 72, assessed by a quantitative assay

Effect	MRS variant	Concentration (mg/mL)	Bacteriocinogenic strain
			L. curvatus 12	L. curvatus 36	W. viridescens 23
Control	MRS	–	25,600	25,600	25,600
pH	2	–	200	0	1600
	4	–	25,600	200	1600
	6	–	25,600	25,600	25,600
	8	–	1600	0	1600
	10	–	12,800	0	0
	12	–	25,600	0	0
Carbo-hydrate	lactose	20	1600	0	25,600
	sacarose	20	800	0	25,600
	mannitol	20	3200	0	800
	fructose	20	25,600	0	25,600
	dextrose	20	25,600	25,600	25,600
	maltose	20	25,600	0	25,600
	raffinose	20	12,800	100	25,600
Organic nitrogen	peptone	25	25,600	0	25,600
	meat extract	25	25,600	0	25,600
	yeast extract	25	25,600	100	25,600
	peptone + meat extract	12.5 + 12.5	25,600	100	12,800
	peptone + yeast extract	15 + 7.5	25,600	200	25,600
	meat extract + yeast extract	15 + 7.5	25,600	100	25,600
	peptone + meat extract + yeast extract	10 + 10 + 5	25,600	25,600	25,600
Chemicals	KH2PO4	0	25,600	100	12,800
		2	25,600	25,600	25,600
		5	25,600	100	25,600
		10	25,600	0	25,600
	MgSO4	0	25,600	25,600	100
		0.1	25,600	25,600	25,600
		0.5	25,600	25,600	100
	MnSO4	0	1600	25,600	0
		0.05	25,600	25,600	25,600
		0.2	25,600	0	100
	Sodium acetate	0	25,600	0	25,600
		5	25,600	25,600	25,600
		10	25,600	100	25,600
	Tri-ammonium citrate	0	25,600	0	25,600
		2	25,600	25,600	25,600
		5	25,600	100	25,600
	Tween 80	0	12,800	0	12,800
		1	25,600	25,600	25,600
		2	25,600	100	25,600
		5	25,600	200	25,600