The contents of ethanol and furfural were determined with a
gas chromatograph GC 7890A (Agilent Technologies) equipped
with a flame ionization detector (FID), as well as a Headspace sampler
7694E (Agilent Technologies) under the following conditions:
Column oven at 120 C, front injection port at 200 C, and N2 is the
carrier gas at a flow rate of 4 ml/min.