Furan compounds and phenolics were measured using a CP-Sil 8-CB low Bleed/MS column
(30 m 0.25 mm i.d., 0.25 lm film thickness; Varian Inc.,
Palo Alto, CA, USA). The flow rate of helium gas through the column
was 1.69 mL min–1. The column temperature was held at 50 C for
1 min isothermally, before being increased by 20 C min–1 to
280 C, where it was maintained for 1 min. The interface and the
ion source temperatures were 250 C and 230 C, respectively. Ions
were generated using a 70 V electron impact, and ion fragments
were detected in the selected ion monitoring mode.