GB 5009.252-2016 Translated English of Chinese Standard. GB5009.252-2016: National Food Safety Standard - Determination of Levulinic Acid in Foods
https://www.chinesestandard.net, 7 apr 2019 - 13 pagine
This Standard specifies the method to use gas chromatography for the test of levulinic acid in foods. This Standard applies to the test of levulinic acid in soy sauce, beverage (including carbonate beverage, coffee beverage, juice, milk beverage, vegetable protein beverage), sauce, honey, milk powder, biscuit, pastry, candy, jelly and flour product.
250 mL separatory accurate to 0.001g acetate to dissolve acetate to fix-volume Acid in Foods acid standard solution add 50 mL Analytical balance anhydrous sodium sulfate arithmetic mean Chromatogram of levulinic chromatograph to test Chromatographic column combine the ether concentration of levulinic content of levulinic corresponding peak areas equipped with hydrogen ether layer extraction twice Figure A.1 flame ionization detector g accurate g of anhydrous gas chromatograph heptanoic acid standard hydrochloric acid hydrogen flame ionization independent test results internal standard method internal standard substance levulinic acid accurate levulinic acid standard mass concentration mL of ether mL of heptanoic mL of hydrochloric mL of saturated mL separatory funnel mL volumetric flask mL/min Preparation of standard reagents repeat the extraction results under repeatability Rotary evaporator sample Accurately weigh sample mass saturated sodium chloride series working solution solution with internal soy sauce standard solution 5.00 standard stock solution sulfate to dehydrate weigh 5 g