Figure 3From: Immobilization of Acetobacter sp. CCTCC M209061 for efficient asymmetric reduction of ketones and biocatalyst recyclingpH stability of free cells (A) and alginate chitosan immobilized cells (B) . pH 3(□), pH 4 (○), pH 5 (△), pH 6(▽), pH 7 (◇), pH 8 (×). Residual activities were measured at 30°C. Error bars show standard deviation from separate experiments conducted in duplicate.Back to article page