GB 5009.257-2016 Translated English of Chinese Standard. GB 5009.257-2016: National Food Safety Standard - Determination of Trans-fatty Acids in Foodstuffs
https://www.chinesestandard.net, 18 jun 2019 - 18 pagina's
This Standard specifies the gas chromatographic method for the determination of trans-fatty acids and isomer in foods. This Standard is applicable to the determination of trans-fatty acids in animal and vegetable fats and oils, hydrogenated vegetable oil, refined vegetable oil and frying oil, as well as foods that contain animal and vegetable fats and oils, hydrogenated vegetable oil, refined vegetable oil and frying oil. This Standard is not applicable to the determination of food samples, in which, free fatty acid (FFA) content in fats and oils is more than 2%.
Expression of Analytical Result
Calculation of FID Response Factor and FID Calibration Factor
37 fatty-acid methyl 70 C water accordance with Formula acid methyl ester animal and vegetable arithmetic mean calculated in accordance Chemical Compounds chromatogram of 37 chromatogram of trans-fatty component X fatty component X fatty-acid Determination of Trans-fatty ester mixed standard ester standard substance ether solution evenly mix Factor and FID factor of component fats and oils fats in foods fatty acid methyl fatty-acid methyl ester FID calibration factor FID response factor Figure B.1 flame ionization detector fraction of fats fraction of trans-fatty g of representative gas phase chromatogram hydrochloric acid mass fraction methanol methyl ester mixed methyl ester standard Methyl Octadecatrienoate mixed standard solution mL test tube Octadecatrienoate Methyl organic phase petroleum ether Potassium hydroxide reach a constant Reagents round-bottomed flask sample Take 500 sample test solution separating funnel Sodium bisulfate sodium sulfate standard intermediate solution stopper Table D.1 trans-fats trans-fatty acid methyl Trans-fatty Acids Content vegetable fats water bath wt---mass fraction