1. Food (saccharin sodium) testing

This standard specifies the method for the determination of benzoic acid, sorbic acid, and saccharin sodium in food. The first method of this standard is applicable to the determination of benzoic acid, sorbic acid, and saccharin sodium in food; The second method is applicable to the determination of benzoic acid and sorbic acid in soy sauce, fruit juice, and jam. The first method is liquid chromatography. The sample is extracted with water. The high fat sample is defatted with n-hexane, and the high protein sample is precipitated with a protein precipitant. The liquid phase chromatography is used for separation, and the UV detector is used for detection. The external standard method is used for quantification. Unless otherwise specified, all reagents and materials used in this method are analytical pure. Water is the first grade water specified in GB/T 6682. 3.1 Reagent 3.1.1 Ammonia (NH, ● H2O). 3.1.2 Potassium ferrocyanide [K, Fe (CN). ● 3H, 0]. 3.1.3 Zinc acetate [Zn (CH, C0O) 2 ● 2H: O]. 3.1.4 Anhydrous ethyl alcohol (CH, CH2OH). 3.1.5 n-hexane (C, H). 3.1.6 Methyl alcohol (CH, OH): Chromatically pure. 3.1.7 Ammonium acetate (CH, COONH,): color harmonic purity. 3.1.8 Formic acid (HCO0H): Chromatically pure. 3.2 Reagent Preparation 3.2.1 Ammonia Water Solution (1+99): Take 1 mL of ammonia water and add it to 99 mL of water, mix well. 3.2.2 Potassium ferrocyanide solution (92 g/L): Weigh 106 g of potassium ferrocyanide, add an appropriate amount of water to dissolve, and bring to a constant volume of 1000 mL. 3.2.3 Zinc acetate solution (183 g/L); Weigh 220 g of zinc acetate and dissolve it in a small amount of water, add 30 mL of glacial acetic acid, and bring it to a constant volume of 1000 ml. 3.2.4 ammonium acetate solution (20 mmol/L) with water. Weigh 1.54 g of ammonium acetate, dissolve it in an appropriate amount of water, bring it to a constant volume of 1000 mI with water, and filter it through a 0.22 μ m aqueous phase microporous filter membrane before use. 3.2.5 Formic acid ammonium acetate solution (2 mmol/L formic acid+20 mmol/L ammonium acetate): Weigh 1.54 g of ammonium acetate and add an appropriate amount of water to dissolve

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