Tagatose detection

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. Two principle samples were extracted with water. High fat samples were defatted with n-hexane and high protein samples were precipitated with protein precipitant. Liquid phase chromatography was used for separation, UV detector detection, and external standard method was used for quantification. Unless otherwise specified, all reagents and materials used in this method are analytical pure. The water is the first grade water specified in GB/T6682. 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 ethanol (CH, CH.OH). 3.1.5 n-hexane (C, H). 3.1.6 Methyl alcohol (CH, OH): Chromatically pure. 3.1.7 Ammonium acetate (CH, COONH,): Chromatically pure. 3.1.8 Formic acid (HCOOH): Chromatically pure. 3.2 Reagent Preparation 3.2.1 Ammonia Solution (1+99): Take 1 mL of ammonia solution, add it to 99 mL of water, and 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 with water to 1000 ml. 3.24 ammonium acetate solution (20 mmol/L): Weigh 1.54 g of ammonium acetate, dissolve it in an appropriate amount of water, bring it to a constant volume with water to 1000 mI, and filter it through a 0.22 pm aqueous phase microporous filter membrane for later 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 dissolve with an appropriate amount of water

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