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)