Typical gas chromatogram of food additive 4-hydroxy-2,5-dimethyl-3(2H)furanone

A typical gas chromatogram of the food additive 4-hydroxy-2,5-dimethyl-3(2H)furanone is shown in Figure B.1.

Figure B.1 Typical gas chromatogram of food additive 4-hydroxy-2,5-dimethyl-3(2H)furanone

B.2 Operating Conditions

B.2.1 Column: capillary column, 30m long, 0.53mm inner diameter.

B.2.2 Stationary phase: polyethylene glycol .

B.2.3 Film thickness: 1.0μm.

B.2.4 Chromatographic oven temperature: constant temperature at 80 °C for 1 min, then linearly program the temperature from 80 °C to 220 °C at a rate of 10 °C/min, and finally at 220 °C for 10 minutes.

B.2.5 Inlet temperature: 240℃.

B.2.6 Detector temperature: 240℃.

B2.7 Detector: Hydrogen flame ionization detector.

B.2.8 Carrier gas: nitrogen.

B.2.9 Pre-column pressure: 0.06～0.07MPa.

B.2.10 Injection volume: about 0.2μL.

B.2.11 Split ratio: 1/100.