Table 2. Specification and operating condition of GC for butyric acid analysis

Instrument GC-FID
Column SP-2560 (Supelco, 100 m×0.2 mm ID, 0.2 μm film)
Detector Flame ionization detector
Oven temperature 100°C (2 min) – 4°C/min – 230°C (20 min)
Injection temperature 230°C
Detector temperature 250°C
Carrier gas He
Column flow 1.5 mL/min
Injection volumn 1.0 μL
Split ratio 50:1
GC, gas chromatograph; FID, flame ionization detector.