Method for detecting content of 3-monochloropropanol-1, 2-diol ester in edible oil
A technology of propylene glycol ester and propylene glycol palmitate diester is applied in the field of detecting the content of 3-chloro-1,2-propylene glycol ester in edible oil, and can solve the problems of polluting a gas chromatography-mass spectrometer, complicated processing steps, affecting analysis efficiency and the like, Achieve the effect of avoiding instrument maintenance, low instrument contamination, and avoiding cross-contamination
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Embodiment 1
[0060] 1. Sample pretreatment
[0061] Weigh 0.100g of homogenized peanut oil into a centrifuge tube with a cover, heat slightly at 40°C to dissolve the fat completely, add 1mL THF solution of the sample, and add 80μL d 5 -3-Chloro-1,2-propanediol palmitic acid diester internal standard solution (4.675 μg / mL, calculated as free state), vortexed to mix.
[0062] 2. Acid catalyzed transesterification, salting out, extraction
[0063] Add 0.5mL of 0.1% sulfuric acid-methanol solution to the centrifuge tube, screw it tightly, and then place it at 40°C for 2 hours of constant temperature reaction. After the reaction is completed, add saturated sodium bicarbonate solution to neutralize and vortex, so that the pH after neutralization is 6.7. Add 2 mL of 20% (v / v) sodium sulfate aqueous solution to the centrifuge tube, and extract with 2 mL of n-heptane solution, discard the organic phase containing fatty acid methyl ester in the upper layer, and obtain the aqueous phase containing 3...
Embodiment 2
[0089] 1. Sample pretreatment
[0090] Weigh 0.150 g of homogenized perilla oil into a centrifuge tube with a cover, and heat slightly at 45°C to dissolve the fat completely. Add 1 mL of tetrahydrofuran solution to the sample, and add 80 μL d 5 -3-Chloro-1,2-propanediol palmitic acid diester internal standard solution (4.675 μg / mL, calculated as free state), vortexed to mix.
[0091] 2. Acid catalyzed transesterification, salting out, extraction
[0092] Add 0.5mL of 0.1 (v / v) sulfuric acid-methanol solution to the centrifuge tube, screw it tightly, and place it at 45°C for 1 hour of constant temperature reaction. After the reaction is over, add saturated sodium bicarbonate solution to neutralize and vortex, so that the pH after neutralization is 7.6. Add 2 mL of 20% (v / v) sodium sulfate aqueous solution to the centrifuge tube, and extract with 2 mL of n-heptane solution, discard the organic phase containing fatty acid methyl ester in the upper layer, and obtain the aqueous...
Embodiment 3
[0098] 1. Sample pretreatment
[0099] Weigh 0.200g of homogenized corn oil into a centrifuge tube with a cover, and heat slightly at 50°C to completely dissolve the fat. Add 1 mL of tetrahydrofuran solution to the sample, and add 80 μL d 5-3-Chloro-1,2-propanediol palmitic acid diester internal standard solution (4.675 μg / mL, calculated as free state), vortexed to mix.
[0100] 2. Acid catalyzed transesterification, salting out, extraction
[0101] Add 0.5 mL of 0.1 (v / v) sulfuric acid-methanol solution to the centrifuge tube, screw it tightly, and place it at 55°C for 30 min at a constant temperature for reaction. After the reaction is over, add saturated sodium bicarbonate solution to neutralize and vortex, so that the pH after neutralization is 8.0. Add 2 mL of 20% (v / v) sodium sulfate aqueous solution to the centrifuge tube, and extract with 2 mL of n-heptane solution, discard the organic phase containing fatty acid methyl ester in the upper layer, and obtain the aqueo...
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