Figure 5. The stability of AcCR.

(A) pH stability (▪); The residual activities after incubation at various pH values (pH 4.5–8.0) for 5 days at 4°C were measured at buffer pH 5.0 and 25°C (NADH as cofactor). (B) Storage stability (▾). The residual activities after incubation at pH 6.5 for 30 days at 4°C were measured at buffer pH 5.0 and 25°C (NADH as cofactor). The relative activity of AcCR without incubation was defined as 100%.