2.5. Chemicals
Kanamycin and isopropyl-β-D-thiogalactopyranoside (IPTG) are purchased from Trans-Gen Biotech (Shanghai, China). NADPH and phenylpyruvate are purchased from Sigma Chemical Company (Tianjing, China). The ionic liquids (99% purity) are purchased from Sigma Chemical Company (Tianjing, China). All other chemicals are analytical grade and purchased from Sinopharm Chemical Reagent Co. Ltd (Shanghai, China).