Parameter detection of health food

This standard specifies the determination method of vitamin Bz in health food. This standard is applicable to the determination of vitamin Bz in tablets, capsules, powders, and functional beverage types of health food. When using solid-phase extraction method to treat samples, the sampling amount is 2.0 g, and the detection limit of the method is 1.0 ug/g. When using the immunoaffinity method to treat samples, the sampling amount for tablets, capsules, and powders is 20 g, and the detection limit of the method is 0.05ug/g; The sampling amount for functional beverages is 20 mL, and the detection limit of the method is 3. o pg/L. Principle 2: Solid phase extraction or immunoaffinity chromatography is used to enrich and remove some impurities in vitamin Bz in the sample extraction solution, and high-performance liquid chromatography is used for analysis. Unless otherwise specified, all reagents used in this standard are analytical pure. The experimental water is all laboratory grade 1 water, with a conductivity (25 ℃) of 0.1 mS/m.3.1 acetonitrile (CH, N): chromatographically pure. 3.2 Methanol (CH, O): premium grade pure. 3.3 Ethanol (C: H. O). 3.4 Tetrabutylammonium chloride (CgHya NC1). 3.55% tetrabutylammonium chloride (C, H, NCI) solution; Weigh 5.0g of tetrabutylammonium chloride, dissolve in water, and dilute to 100 mL. 3.6 Chloroform (CHCl,). 3.7 Trifluoroacetic acid (CF, O: H). 3.8 Citric acid (CH: O.). 3.9 Potassium dihydrogen phosphate (KH, PO). 3.10 Sodium hydroxide (NaOH). 3.11 Phosphate buffer solution (pH 6.5): Take 0.68 g of potassium dihydrogen phosphate, add 15.2 mL of 0.1 mol/L sodium hydroxide solution, and dilute with water to 100 mL. 3.12 Vitamin Bz standard; Purity ≥ 99%. 3.13 5% acetonitrile: Measure 50 mL of acetonitrile and dilute with water to a constant volume of 1 oo0 mL. 3.1425% acetonitrile: Take 250 mL of acetonitrile and dilute with water to a constant volume of 1 oo0 mL. 3.15 Vitamin B: Standard stock solution; Weigh 10 mg of vitamin Bz standard solution (accurate to 0.1 mg), dissolve in 5% ethanol, and bring to volume in a 10 mL brown volumetric flask. Mix well to obtain the standard stock solution of vitamin Bz. Cold storage. 3.16 Vitamin B standard intermediate solution: Take 1 mL of stock solution into a 25 mL brown volumetric flask and dilute with water to obtain the standard intermediate solution of vitamin Bz. Cold storage. 3.17 Vitamin B, standard series; Take 0.05 mL, 0.10 mL, 0.50 mL. 1.00 mL, and 2.00 mL. 5.00 mL of standard intermediate solutions into a 10 mL brown volumetric flask, and dilute with water to obtain the vitamin B standard solution series

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