Lactase, lactase preparation, gene, recombinant vector, and transformant

Abstract

Provided is a lactase preparation having an excellent lactose decomposing action in milk. A lactase according to an aspect of the present invention has, as lactase activity, any one of the following activities (1) to (6) or a combination of two or more thereof: (1) when the lactase is added to cow's milk, an added amount of protein in the lactase at which a residual lactose concentration reaches 0.1% or less after 16 hours at 10° C. is 15.1 mg/L or less; (2) when the lactase is added to cow's milk, the added amount of protein in the lactase at which the residual lactose concentration reaches 0.01% or less after 16 hours at 10° C. is 30.2 mg/L or less; (3) when the lactase is added to cow's milk, the added amount of protein in the lactase at which the residual lactose concentration reaches 0.10% or less after 24 hours at 10° C. is 10.1 mg/L or less; (4) when the lactase is added to cow's milk, the added amount of protein in the lactase at which the residual lactose concentration reaches 0.01% or less after 24 hours at 10° C. is 15.1 mg/L or less; (5) when the lactase is added to cow's milk in an amount that makes a final concentration 1.4 LYU/ml, the residual lactose concentration reaches 0.1% or less after 24 hours at 10° C.; and (6) when the lactase is added to cow's milk in the amount that makes a final concentration 2.1 LYU/ml, the residual lactose concentration reaches 0.01% or less after 24 hours at 10° C.

Dependencies are inferred from the claim text.