1、 Method for determination of fatty acids in vegetable oils:
1. Principle: After converting fatty acid glycerides into fatty acid methyl esters, perform gas chromatography analysis. Determine the composition ratio of each fatty acid using normalization method.
2. Gas chromatography conditions: FFAP column (or PEG-20M) 0.32mm * 30M vaporization: 230-240 ℃; Column temperature: 220 ℃
3. Instrument configuration: GC-2010 gas chromatograph+dual FID detector+packed column injection port+capillary injection port

2、 Analysis of residual solubility of vegetable oil:

1. Principle: Place the vegetable oil sample in a sealed vaporization bottle (headspace bottle) and place it in a 50 ℃ environment for half an hour. When the residual solvent vaporizes to equilibrium, take the gas from the liquid and inject it into the gas chromatograph for detection.
2. Gas chromatography conditions: 5% DEGS Φ 3 × 3 stainless steel packed column; Column temperature: 60 ℃; Vaporization: 140 ℃;
3. Instrument configuration: GC-7890 gas chromatograph+dual FID detector+packed column injection port+capillary injection port
Multiple testing items for vegetable oil can be completed using the same instrument