2.3. Equipment
Electronic analytical balance (Shanghai Minqiao Precision Scientific Instrument Co. Ltd), a centrifuge (Model SC-3614; Anhui, China), laboratory pH Meter (Ohaus Instruments Co. Ltd), a vortex mixer (SCI-VS; SCILOGEX, USA), a GC-MS (Agilent 7890/5975C-GC/MSD; Agilent Technologies, USA), a constant-temperature shaker (SHA-B; Guohua company, China)