Specifically, an amount of about 122.00 g BSG biocatalyst or 120.00 g of wet MSR biocatalyst was added in 250 mL of pasteurized whey and fermentations were carried out (i) at various pH values 4, 5, 5.5, 6 and 6.5 at 30 C and (ii) at various temperatures of 10, 20, 25 and 30 C under 5.5 pH value.