Abstract

ABSTRACTCommercial preparations of acid and neutral β‐galactosidases were assayed for their ability to hydrolyze lactose in wheys with varying total solids content. In wheys with 7.3 to 24.7% TS, at pH 4.5 and 55°C the lactose conversion obtained in 300 min with the acid lactase ranged from 92 to 75%. Similarly, the neutral lactase hydrolyzed between 92 and 79% of lactase in wheys adjusted to pH 6.5 and 35°C; however, the reaction appeared to reach its maximum after 90 min in contrast to the acid lactase.

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