1.capillary GLC method
Centrifuge the culture at 3000 * g for 15 min and remove 1.0 ml of the supernatant fluid. Add 50 µl of internal standard. Also standard solution containing the following:
For analysis use a gas chromatograph equipped with a flame ionization detactor and split/splitless injector. Use a 30m*0.5mm fused silica capillary column coated with 0.1 µm DB1. Use injector and detector temperatures of 275°C with the column temperature programmed from 63°C for 30 min to 190°C to 10°C/min. use helium as the carrier gas (head pressure, 135 kPa). Make injections (1µl) in the split mode (50:1 split). Record peak areas with an integrator.