2.3 Preparation of resting cells and establishment of bioconversion system
Resting cells were prepared according to the method described by Gao et al.[14] The bioconversion of PS was performed in the reaction system of 10 mL phosphate buffer (20 mM, pH 8.0, PB), including PS 50 g/L, HP-β-CD 200 g/L, and resting cell 100 g/L in 250 mL flasks at 30 °C and 200 rpm.