The pH was controlled in the range of 7.5~8.0 by manual addition of filter sterilized 0.1 M NaOH solution. Glucose, NH4Cl and 17α-Ethinyl Estradiol were sterilized by filtration and then added into sterilized medium.
Solution B (NaFeEDTA Solution): 100mg NaFeEDTA( molecular formula C10H12FeN2NaO8·3H2O) dissolved in 100mL double distilled water.
Solution C(microelement): 10mg Na2MoO4·H2O, 17.2mg MnSO4·H2O, 0.4mgCoCl2·6H2O, 12mg ZnSO4·7H2O, 50mg CuSO4·5H2O, dissolved in 100mL double distilled water.
Media was sterilized in an autoclave. The pH was controlled in the range of 6.8~7.8 by manual addition of filter sterilized 2 M KHCO3 solution.