GB 5009.157-2016: Translated English of Chinese Standard. GB5009.157-2016: National food safety standard - Determination of Organic Acid in Foods
https://www.chinesestandard.net, Jul 21, 2018 - Technology & Engineering - 12 pages
This Standard specifies the method of determining tartaric acid, lactic acid, malic acid, citric acid, succinic acid, fumaric acid and adipic acid in foods. This Standard is applicable to the determination of seven types of organic acid in fruit juice, fruit juice beverage, carbonated beverage, solid beverage, gum-based candy, cookies, pastry, jelly, canned fruit, fresh dough products and fillings in baked goods.
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100 mL heart-shaped 25 mL volumetric accurate to 0.01 acid 250 mg/kg acid 50 acid 500 mg/kg Acid in Foods acid solution 3.2.1 acid standards add 20 mL add 5 mL add water adipic acid adopt anhydrous ethanol 3.1.2 approaches dryness arithmetic mean Chromatogram of Six chromatograph for analysis Chromatographic column citric acid constant volume continue the concentration control the flow Determination of Organic eluent and place extraction column SAX flow rate fruit juice beverage fumaric acid g accurate heart-shaped bottle twice hermetic place high-performance liquid chromatograph homogenized sample inject lactic acid malic acid mass concentration membrane to filter mg/L mL heart-shaped bottle mL of anhydrous mL of phosphoric mL of water mL volumetric flask mL/min~2 mL/min Organic Acid phase extraction column phosphoric acid solution r/min reaches absolute dryness sample solution solid beverage solid phase extraction Standard Chromatogram standard curve line Standard stock succinic acid tartaric acid water to rinse