An Agilent1200 series high performance liquid
chromatography (HPLC) (Agilent Technologies, USA) consisting of a quaternary
pump and a fluorescence detector was used to determine citrinin content. The 10 L
SG series stainless steel fermentation tank was purchased from Shanghai Lianhuan
Bio-engineering Equipment Co. Ltd. The ZHWY-2102C series of shaking incubators
was purchased from Shanghai Zhicheng Analytical Instrument Manufacturing Co.
Ltd. The acetonitrile were of HPLC grade. All other reagents were of analytical grade