2.7. Determination of FAME contents
Chromatographic analysis of the FAME contents of the productswas performed using a GC-2010 gas chromatograph equipped with a flame ionization detector. The column used was Rtx-2330 10% cyanopropylphenyl–90% biscyanopropyl polysiloxane column. The operating conditions were set as follows. The injector and detector temperatures were set at 250 °C. The column temperature was held at 150 °C for 2 min, and then raised to 250 °C at 5 °C/min and held for 8 min. Hydrogen flow, air flow and make up flow were set at 50.0 mL/min, 500.0 mL/min and 30 mL/min,respectively while the linear velocity and purge flow were 8.0 cm/s and 3.0 mL/min, respectively. A 37 component FAME mix. standard was used to identify the individual FAMEs in the product. Total biodiesel yield of Po1g biomass reacted under subcritical condition was calculated by using the equation:
Total FAME yield ð%;w=wÞ ¼ Total weight of FAMEs ðgÞ
Dry biomass ðgÞ
100%
The FAME conversion (%, peak area) was calculated based on the
peak area of the GC chromatogram of the components in the reaction
product.
FAME conversion yield ð%; peak areaÞ ¼ Total peak area of FAMEs
Total peak area of the products
100%: