GB 25542-2010 English PDF

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GB 25542-2010: The national food safety standards of food additives glycine (amino acid)
Status: Valid

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Basic data

Standard ID: GB 25542-2010 (GB25542-2010)
Description (Translated English): The national food safety standards of food additives glycine (amino acid)
Sector / Industry: National Standard
Classification of Chinese Standard: X40
Classification of International Standard: 67.220.20
Word Count Estimation: 9,948
Date of Issue: 2010-12-21
Date of Implementation: 2011-02-21
Regulation (derived from): Ministry of Health Bulletin No. 19 of 2010
Issuing agency(ies): Ministry of Health of the People's Republic of China
Summary: This Chinese standard applies to a process of trichloroacetic acid amide obtained by purification of industrial amino acid dissolved in water, active carbon and other processes obtained by recrystallization food additive glycine (amino acid).

GB 25542-2010: The national food safety standards of food additives glycine (amino acid)

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
The national food safety standards of food add glycine (amino acid) National Standards of People's Republic of China National standards for food safety Food Additives Glycine (Glycolic Acid) 2010-12-21 release 2011-02-21 Implementation Issued by the Ministry of Health of the People's Republic of China National standards for food safety Food Additives Glycine (Glycolic Acid)

1 Scope

This standard is applicable to the process of recrystallization of industrial aminoacetic acid obtained by the monochloroacetic acid amination process by dissolving purified water and decolorizing activated carbon The resulting food additive is glycine (aminoacetic acid).

2 normative reference documents

The documents cited in this standard are indispensable for the application of this standard. Any reference to the date of the document, only the date of the edition This applies to this standard. For undated references, the latest edition (including all amendments) applies to this standard. 3 molecular formula, structural formula and relative molecular mass 3.1 Molecular formula C2H5NO2 3.2 Structural formula CH2NH2 C OH 3.3 Relative molecular mass 75.07 (according to.2007 International Relative Atomic Quality)

4 technical requirements

4.1 sensory requirements. should be consistent with the provisions of Table 1. Table 1 sensory requirements The project requires a test method Color white Organizational state Crystalline granules or crystalline powders Take appropriate laboratory samples, placed in a clean, dry white porcelain dish, in natural light Under the visual observation 4.2 Physical and chemical indicators. should be consistent with the provisions of Table 2. Table 2 Physical and chemical indicators Item Index Test Method Aminoacetic acid (on a dry basis), w /% 98.5 to 101.5 Appendix A, A.4 Chloride (in Cl), w /% ≤ 0.010 Appendix A A.5 Arsenic (As)/(mg/kg) ≤ 1 Appendix A A.6 Heavy metals (Pb)/(mg/kg) ≤ 10 Appendix A A.7 Dry reduction, w /% ≤ 0.20 Appendix A, A.8 Residue on ignition, w /% ≤ 0.10 Appendix A, A.9 The clarity test was carried out in Test Appendix A. A.10 pH (50 g/L aqueous solution) 5.5 to 7.0 Appendix A A.11

Appendix A

(Normative appendix) Testing method A.1 Warning Some of the test procedures specified in the test method may result in a hazardous situation. Operators should take appropriate safety and protective measures. A.2 General provisions Unless otherwise stated, only the reagents identified as analytical reagents and the tertiary water specified in GB/T 6682-2008 are used in the analysis. Standard titration solution used in the test method, standard solution for the determination of impurities, preparations and articles, in the absence of other requirements, GB/T 601, GB/T 602 and GB/T 603. A.3 Identification test A.3.1 Reagents and materials A.3.1.1 Indanetone solution. 1 g/L. A.3.1.2 Hydrochloric acid solution. 1 3. A.3.1.3 Sodium nitrite solution. 100 g/L. A.3.1.4 Chromic acid solution. Weigh 0.5g of chromic acid, add 50mL sulfuric acid solution (2 1) shake, centrifugal separation, the use of supernatant. The solution should be prepared before use. A.3.2 Analysis steps A.3.2.1 Indanone test Weigh about 0.1g of laboratory samples, accurate to 0.01g, dissolved in 100mL water, take this solution 5mL, add 1mL indan three ketone dissolved Liquid, heated to boiling about 3min after the purple. A.3.2.2 Nitroso test Weigh about 1g of laboratory samples, accurate to 0.01g, dissolved in 10mL water, take this solution 5mL, add 5 drops of hydrochloric acid solution and 1mL The newly prepared sodium nitrite solution produces a colorless gas. The solution 5 drops into the test tube, boiled in the water bath on the steam, cooling, to the residue Add 5 drops to 6 drops of chromic acid solution, in the water bath for 10min ~ 30min after the deep purple. A.4 Determination of aminoacetic acid A.4.1 Methodological Summary Samples to formic acid as a co-solvent, glacial acetic acid as a solvent to crystal violet as an indicator, titration with perchloric acid standard titration, according to high consumption Determination of the content of aminoacetic acid by the volume of the standard titration solution of chloric acid. A.4.2 Reagents and materials A.4.2.1 Glacial acetic acid. A.4.2.2 anhydrous formic acid. A.4.2.3 Perchloric acid standard titration solution. c (HClO4) = 0.1 mol/L. A.4.2.4 Crystal violet indicator solution. 2g/L. A.4.3 Analysis steps A.4.3.1 Weigh dry matter A in about 0.15gA.8.1, accurate to 0.0001g, placed in 250mL dry conical flask, add about 1mL anhydrous formic acid dissolved, add 30mL glacial acetic acid, add 2 drops of crystal violet indicator solution, titration with perchloric acid standard titration solution to the solution by the purple Color turns to bright blue and green for the end. A.4.3.2 At the same time as the determination, the same amount of reagent solution was used as a blank test in the same procedure as for the measurement. A.4.4 Calculation of results The mass fraction w1 of the aminoacetic acid (on a dry basis) is expressed in% and is calculated according to the formula (A.1) w1 = (V1-V2) × c × M m x 1000 x 100% (A.1) Where. V1 --- sample consumption perchloric acid standard titration solution (A.4.2.3) volume in milliliters (mL); V2 --- blank consumption Perchloric acid standard titration solution volume value in milliliters (mL); c - the exact value of the perchloric acid standard titration solution concentration in moles per liter (mol/L); m - the mass of the sample, in grams (g); M - The molar mass of aminoacetic acid in grams per mole (g/mol) (M = 75.07). The arithmetic mean of the results of two parallel measurements is the result of the report. The absolute difference between the two parallel determinations is not more than 0.3%. A.5 Determination of chloride A.5.1 Reagents and materials A.5.1.1 Nitric acid solution. 1 9. A.5.1.2 Silver nitrate solution. 17 g/L. A.5.1.3 Chloride (Cl) Standard solution. 0.1 mg/mL. A.5.2 Analysis steps Weigh about 1.0g of laboratory samples, accurate to 0.01g, placed in 50mL colorimetric tube, add 30mL of water dissolved, add 6mL nitric acid dissolved Liquid, add water to 50mL for the sample solution. Take another color tube, add 1mL ± 0.02mL chloride (Cl) standard solution, add 30mL Water, add 6mL nitric acid solution, add water to 50mL as the standard turbid liquid. Add 1 mL of silver nitrate to the sample solution and standard than the turbid solution Solution, fully mixed, to avoid direct sunlight, placed 5min, in the black background side or axial observation, the sample solution of turbidity Greater than the turbidity of the standard turbid liquid. A.6 Determination of arsenic According to GB/T 5009.76 arsenic spot method. Measure about 1.0g of laboratory samples, accurate to 0.01g. Limited standard solution Preparation. Remove 1mL ± 0.02mL arsenic standard solution (containing arsenic containing 1.0μg) with pipettes and treat the same sample at the same time as the sample. A.7 Determination of heavy metals A.7.1 Reagents and materials A.7.1.1 Sodium hydroxide solution. 43 g/L. A.7.1.2 Sodium sulfide solution. 100g/L, the solution should be prepared before use. A.7.1.3 Lead (Pb) standard solution. 0.01 mg/mL. A.7.2 Analysis steps Weigh about 1.0g of laboratory samples, accurate to 0.01g, placed in 25mL colorimetric tube, add 5mL sodium hydroxide solution, add water And diluted to 25mL, add 5 drops of sodium sulfide solution, shake, place 2min, the color should not be deeper than the standard. The standard is to absorb 1mL ± 0.02 mL lead (Pb) limited standard solution (lead 0.01mg), the same treatment with the sample at the same time. A.8 Determination of dry reduction A.8.1 Analysis steps Weigh about 1.0g of laboratory samples, accurate to 0.0001g, placed in the pre-105 ℃ ± 2 ℃ dry to the constant quality of the weighing bottle , And a layer of 5 mm or less is laid. In 105 ℃ ± 2 ℃ constant temperature drying oven for 3h, placed in a dryer for 30min cooling. A portion of the dried product (this is dry matter A) is used for the determination of the aminoacetic acid content. A.8.2 Calculation of results The mass fraction w2 of the drying reduction, the value in%, calculated according to the formula (A.2). w2 = m-m1m x 100% (A.2) Where. m - the mass of the sample before drying, in grams (g); m1 --- the mass of the sample after drying, in grams (g). The arithmetic mean of the results of two parallel measurements is the result of the report. The absolute difference between the two parallel determinations is not more than 0.05%. A.9 Determination of burning residue A.9.1 Reagents and materials A.9.1.1 Sulfuric acid. A.9.1.2 Sulfuric acid solution. 1 8. A.9.2 Analysis steps Weigh 2g ~ 3g laboratory samples, accurate to 0.0001g, placed at 800 ℃ ± 25 ℃ burning to the quality of the porcelain crucible, Add the appropriate amount of sulfuric acid solution to completely wet the sample. Heat slowly with a small fire until the sample is completely carbonized and cooled. Add about 0.5mL sulfuric acid dip Wet residue, low temperature heating to sulfuric acid vapor escape. In the 800 ℃ ± 25 ℃ burning 45min. Into the dryer to cool to room temperature, weighing. A.9.3 Calculation of results The mass fraction of the burning residue w3, expressed in%, calculated according to the formula (A.3). w = m1m × 100% (A.3) Where. m - the mass of the sample, in grams (g); m1 - the mass of the residue, in grams (g). The arithmetic mean of the results of two parallel measurements is the result of the report. The absolute difference between the two parallel determinations is not more than 0.02%. A.10 clarification test A.10.1 Reagents and materials A.10.1.1 Nitric acid solution. 1 2. A.10.1.2 Dextrin solution. 20 g/L. A.10.1.3 Silver nitrate solution. 20 g/L. A.10.1.4 Turbidity standard solution. chlorine (Cl) 0.01mg/mL. Determination of c (HCl) = 0.1mol/L hydrochloric acid standard titration solution 14.1 mL ± 0.02 mL, placed in 50 mL volumetric flask, diluted to the mark. The solution was taken at 10 mL ± 0.02 mL in 1000 mL Volume bottle, add water diluted to the mark, shake. A.10.2 Analysis steps Weigh about 1.0g of laboratory samples, accurate to 0.01g, placed in the color tube, dissolved in water and diluted to 25mL, as the test solution Liquid; take another colorimetric tube, accurately add 0.20mL turbidity standard solution, add water to 20mL, add 1mL nitric acid solution, 0.2mL dextrin Solution and 1mL silver nitrate solution, add water to 25mL, shake, dark place 15min, as the standard turbid solution. In the absence of direct sunlight, axial and lateral observation, test solution turbidity shall not be greater than the standard turbid solution turbidity. A.11 Determination of pH According to GB/T 9724. Weigh about 1.0g of laboratory samples, accurate to 0.01g, add 20mL of carbon dioxide-free water mixture After the determination. ......

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