GB 29937-2013Food additive -- Sodium carboxymethyl starch (English PDF)

2.1 Raw materials

2.1.1 Raw materials

Food starch should be consistent with national standards or industry standards-related products.

2.1.2 Accessories

2.1.2.1 should meet the national standards or industry standards or the relevant provisions of the relevant requirements of the product.

2.1.2.2 etherifying agent. monochloroacetic acid or its sodium salt.

2.2 Sensory requirements

Sensory requirements shall comply with the requirements of Table 1.

Table 1 Sensory requirements

Project requires test methods Color white, white or light yellow Take 50 g sample in a clean white porcelain dish, under natural light, observation its color, state, smell the smell Status granular, flaked or without visible impurities Inherent odor product smell, no odor

2.3 Physical indicators

Physical and chemical indicators should be consistent with the provisions of Table 2.

Table 2. Physical and chemical indicators

Item Index Test Method Loss on drying, w /% <= 10.0 GB/T 12087 Total arsenic (As)/(mg/kg) <= 0.5 GB/T 5009.11 Lead (Pb)/(mg/kg) <= 1.0 GB 5009.12 Sulfur dioxide/(mg/kg) <= 30 GB/T 22427.13 Chloride (based on Cl) /% <= 0.43 Appendix A A.4 Sulfate (SO4 meter) /% <= 0.96 Appendix A A.5 Appendix A Testing method A.1 Safety Tips Reagents The standard test methods used for toxic or corrosive, the operation should be careful! As splashed on the skin should stand that is rinsed with water, severe cases should be treated immediately.

A.2 General Provisions Unless otherwise indicated in the analysis using only recognized as analytical reagents and GB/T 6682 stipulated three water. Test Methods Standard titration solution, impurities measured by standard solution, preparations and products, did not indicate when the other requirements, according to GB/T 601, GB/T 602 and 603 of the regulations prepared GB/T ; the solution when the solvent is not specified, refer to the aqueous solution.

A.3 Identification Test A.3.1 iodine staining 1 g of the sample was added 20 mL of water were suspended, several drops of iodine solution, the color should range from deep blue to reddish brown.

A.3.2 copper reduction A.3.2.1 formulated alkaline tartrate copper test solution A.3.2.1.1 Solution A. Copper Sulfate (CuSO4 · 5H2O) 34.66 g, should be no weathering or moisture absorption phenomenon, dissolved in water volume to 500 mL.

The solution was stored in a small sealed container.

A.3.2.1.2 Solution B. take potassium sodium tartrate (KNaC4H4O6 · 4H2O) 173 g sodium hydroxide 50 g, dissolved in water volume to 500 mL.

The solution was stored in a small container and alkali corrosion.

A.3.2.1.3 solutions A and B mixed in equal volumes, to obtain an alkaline tartrate copper test solution.

A.3.2.2 analysis step Weigh the sample 2.5 g, placed in a flask, 0.82 mol/L hydrochloric acid solution of 10 mL of water and 70 mL, mixing, boiling water bath Was refluxed for 3 h, cooled. Take 0.5 mL solution was cooled, added 5 mL hot alkaline copper tartrate solution, a large amount of red precipitate.

A.4 Determination of chloride A.4.1 Reagents and materials A.4.1.1 nitrate.

A.4.1.2 hydrochloric acid.

A.4.1.3 silver nitrate.

A.4.1.4 hydrochloric acid solution. c (HCl) = 0.01 mol/L. Measure 9 mL of hydrochloric acid slowly into 1000 mL of water, shake well. 100 mL of Solution slowly into 1000 mL of water, diluted 10 times and shake.

A.4.1.5 silver nitrate solution. c (AgNO3) = 0.1 mol/L.

A 4.2 Preparation of sample solution Sample taken 0.1 g, add 10 mL of water and 1 mL of nitric acid and heated 10 min After cooling, necessary, to add the filter in a water bath. With a small amount of the residue was rinsed with water, the combined washings and filtrate, add water to 100 mL, whichever is 25 mL, as the sample solution.

A.4.3 Analysis step

In the sample solution and 0.30 mL of hydrochloric acid were added to a solution of 1 mL of silver nitrate solution, mix well and let stand 10 min, in the dark, Observe and compare the two solutions turbidity, the turbidity of the sample solution should not exceed hydrochloric acid solution.

A.5 Determination of sulfates A.5.1 Reagents and materials A.5.1.1 hydrochloric acid.

A.5.1.2 sulfuric acid.

A.5.1.3 barium chloride.

A.5.1.4 sulfuric acid solution. c (422

1 SOH) = 0.01 mol/L. Measure 3 mL sulfuric acid slowly into 1000 mL of water, shake well. measure 100 mL solution slowly into 1000 mL of water, diluted 10 times and shake.

A.5.1.5 barium chloride solution. c (BaCl2) = 8.5 × 10-3 mol/L. 1.779 g of barium chloride are dispersed in 1000 mL of water, shake well.

A.5.2 Preparation of sample solution Cooling, if necessary, after the sample was weighed out 0.1 g, accurate to 0.01 g, add 10 mL of water and 1 mL of hydrochloric acid, heated in a water bath for 10 min Additive filtering. The residue was rinsed with a small amount of water, the filtrate and washings were combined, water was added to 50 mL, whichever 10 mL, as a sample solution.

A.5.3 measuring step the sample and 0.40 mL sulfuric acid solution were added 2 mL of barium chloride solution, mix well and let stand 10 min, was observed in the dark, and compare the two turbidity of the solution, the sample solution should not exceed the sulfuric acid solution turbidity.