Table 4 Cost comparisons between modified medium MM2 and commercial MRS medium.

Food-grade ingredients	Price US $/L	Lab-grade ingredients	Price US $/L
Food-grade ingredients	MM2	Lab-grade ingredients	Standard MRS	MRS_ Brand 1	MRS_ Brand 2	MRS_ Brand 3
Dextrose	0.012	Dextrose	0.37	+	+	+
Glucose	-	Yeast extract	0.26	+	+	+
Yeast extract	0.43	Beef extract	0.83	+	+	+
Soy isolate protein	-	Proteose peptone	2.53	+	+	+
Tween 80	0.0093	Tween 80	0.05	+	+	+
Ammonium citrate	1.49	Ammonium citrate	1.49	+	+	+
K₂HPO₄	0.0038	K₂HPO₄	0.052	+	+	+
Sodium acetate	0.0063	Sodium acetate	0.34	+	+	+
MgSO₄	0.000054	MgSO₄	0.011	+	+	+
MnSO₄	0.00014	MnSO₄	0.002	+	+	+
Total	̴ 1.95	Total	̴ 5.94	̴ 9.53	̴ 11.85	̴ 14.34

- This agent not included in the medium formulation. + This agent included in the medium formulation. The price was calculated in US$ currency in April 2024.

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