GB 1886.256-2024 English PDFUS$159.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 1886.256-2024: National Food Safety Standards--Food Additives--Methylcellulose Status: Valid GB 1886.256: Historical versions
Basic dataStandard ID: GB 1886.256-2024 (GB1886.256-2024)Description (Translated English): National Food Safety Standards--Food Additives--Methylcellulose Sector / Industry: National Standard Classification of Chinese Standard: X09 Word Count Estimation: 9,933 Date of Issue: 2/8/2024 Issuing agency(ies): National Health Commission of the People's Republic of China, State Administration for Market Regulation GB 1886.256-2016: National Food Safety Standard -- Food Additives -- Methylcellulose---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.(Food safety national standard - Food additive - Methyl cellulose) National Standards of People's Republic of China National standards for food safety Food Additives Methylcellulose 2016-08-31 released 2017-01-01 Implementation People's Republic of China National Health and Family Planning Commission released National standards for food safety Food Additives Methylcellulose 1 ScopeThis standard applies to wood pulp or cotton pulp and other natural cellulose as raw materials, the alkalization and etherification treatment, and then washed, dried after the system Food Additives Methylcellulose. 2 Chemical name, structural formula, molecular formula and relative molecular mass 2.1 Chemical name Cellulose methyl ether 2.2 Structural formula R = H or CH3 2.3 Molecular formula [C6H7O2 (OH) x (OCH3) y] n Where x = 1.00 to 1.55, y = 2.00 to 1.45, and xy = 3.00 (y = degree of substitution). 2.4 Relative molecular mass (according to.2011 international atomic mass) Unsubstituted structural units. 162.14; A structural unit with a degree of substitution of 1.45. 182; Structure unit with degree of substitution of 2.0. 190.3 technical requirements3.1 sensory requirements Sensory requirements shall comply with the requirements of Table 1. Table 1 sensory requirements The project requires a test method Color white or near white State powder or particles Take appropriate sample in a clean, dry white porcelain dish Natural light, observe the color and state 3.2 Physical and chemical indicators Physical and chemical indicators should be consistent with the provisions of Table 2. Table 2 Physical and chemical indicators Item Index Test Method Methoxy (-OCH3) content (on a dry basis), w /% 27.5 to 31.5 Appendix A, A.3 Viscosity/(mPa · s) Mark the viscosity ≤ 100 of the product marked value of 80% to 120% 75% to 140% of the marked value of the product with a viscosity > Appendix A, A.4 Dry reduction, w /% ≤ 5.0 GB 5009.3 direct drying method a Burning residue, w /% ≤ 1.5 GB/T 9741b Lead (Pb)/(mg/kg) ≤ 2.0 GB 5009.12 a Drying temperature of 105 ℃ ± 2 ℃, the time is 2h. b burning temperature of 800 ℃ ± 25 ℃, time 15min.Appendix ATesting method A.1 General provisions The reagents and water used in this standard, when not specified in other requirements, refer to the analysis of pure reagents and GB/T 6682 provides three levels of water. test The standard solution, impurity standard solution, preparation and preparation used in the test shall be classified according to GB/T 601, GB/T 602, GB/T 603. The solution used in the test refers to the aqueous solution when it is not specified in the formulation of the solvent. A.2 Identification test A.2.1 Reagents and materials Sodium hydroxide solution or hydrochloric acid solution. 1mol/L. A.2.2 Preparation of sample solution One g of the sample was added to the upper beaker (liquid surface) containing 100 mL of water, allowed to disperse and settle on the surface of the solution to make the sample transparent Viscous solution (about 5h), shake the beaker to wet the remaining sample, stir with the glass rod to the sample completely dissolved. A.2.3 Identification method A.2.3.1 take 10mL sample solution, add the same volume of sodium hydroxide solution or hydrochloric acid solution, this time, the mixture should be kept transparent, there are Sticky. A.2.3.2 take 10mL sample solution, heating, the solution to produce mist and flaky precipitate, after cooling and dissolved. A.2.3.3 take 10mL sample solution, pouring on the glass plate, evaporate to remove water, forming a white film. A.3 Determination of methoxy (-OCH3) content (on dry basis) A.3.1 Reagents and materials A.3.1.1 Toluene. A.3.1.2 o-xylene. A.3.1.3 Adipic acid. A.3.1.4 Hydrogenic acid. A.3.1.5 Methyl iodide. A.3.2 Instruments and equipment Gas chromatograph. equipped with thermal conductivity detectors, or other equivalent detectors. A.3.3 Reference chromatographic conditions A.3.3.1 Column. 1.8m × 4mm glass column, filler 125μm ~ 150μm Chromatographic pure diatomite Contains 10% methyl silicone oil Or other equivalent columns. A.3.3.2 Column temperature. 100 ° C. A.3.3.3 Inlet temperature..200 ° C. A.3.3.4 Detector temperature..200 ° C. A.3.3.5 Carrier gas. helium. A.3.3.6 Flow rate. 20 mL/min. A.3.3.7 Injection volume. about 2 μL. A.3.3.8 Chromatographic retention times for methyl iodide, toluene and o-xylene were 3 min, 7 min and 13 min, respectively. A.3.4 Analysis steps NOTE. Perform the procedure for containing hydroiodic acid in a fume hood. Use goggles, acid resistant gloves and other suitable safety equipment. in When handling hot glass bottles, due to pressure, it should be extremely careful. In case of inadvertent exposure to hydroiodic acid, apply plenty of water to rinse and seek medical attention immediately help. A.3.4.1 Preparation of internal standard solutions Weigh 2.5g toluene, accurate to 0.001g, diluted with o-xylene to 1000mL. A.3.4.2 Preparation of standard solutions Weigh 135mg adipic acid, accurate to 0.001g, placed in a suitable serum bottle, add 4.0mL hydroiodic acid, then add 4.0mL Standard solution, sealed with a diaphragm cover the bottle, weighing. Through the membrane, into the 90μL methyl iodide, and then weighing, calculate the weight of methyl iodide added. Mixed evenly, after standing and stratified. A.3.4.3 Preparation of sample solution Weigh 0.065g sample, accurate to 0.001g, placed in 5mL bottle with pressed diaphragm, add the same amount of adipic acid as the sample, and then Add 2 mL of internal standard solution. Carefully absorb 2mL hydroiodic acid, add the bottle, tighten the cap, weigh. Shake the bottle 30s at 150 ° C Under the heating 20min, and then shake, and then heated at 150 ℃ conditions for 40min. The bottles were cooled for 45 min and weighed. If the weight loss super Over 10mg, then discard, re-preparation of the sample solution. A.3.4.4 Determination Absorb the standard solution supernatant, in A.3.3 reference chromatography conditions, the chromatographic analysis, record the chromatogram, calculate the quality of toluene And the relative response factor F of methyl iodide, to calculate the methoxy (-OCH3) content (on a dry basis). A.3.4.5 Calculation of results A.3.4.5.1 The relative response factor F of the mass of toluene and methyl iodide is calculated according to formula (A.1) F = (A.1) Where. Q --- mass ratio of methyl iodide to toluene in standard solution; A - The peak area ratio of methyl iodide to toluene in the standard solution chromatogram. A.3.4.5.2 The mass fraction w of methoxy (-OCH3) (dry basis) is calculated according to formula (A.2) w = 2 × 142 × F × α × m1 (A.2) Where. The relative molecular mass ratio of methoxy and methyl iodide; F - the actual measured response of toluene and methyl iodide; α - ratio of the peak area of methyl iodide and toluene in the chromatogram of the sample solution; m - the mass of toluene in the internal standard solution, in grams (g); m1 --- sample quality, in grams (g). The test results are based on the arithmetic mean of the parallel measurement results, leaving 2 significant digits. Under the conditions of repeatability measurement twice The absolute difference in the independent determination results does not exceed 10% of its arithmetic mean. A.4 Determination of viscosity An appropriate amount of the sample was weighed and water was added to a solution of 2 g/100 mL of water heated at 80 ° C to 90 ° C before heating at about 400 r/min Under the conditions of stirring 10min ~ 20min, ice bath in the cooling, continue stirring 40min, the sample solution temperature adjustment to 20 ℃ ± 1 ℃, Select the appropriate rotary viscometer for determination. When the viscosity (mass fraction of 2% aqueous solution) ≥.20000mPa · s, should use the quality of points The amount of 1% aqueous solution. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 1886.256-2024_English be delivered?Answer: Upon your order, we will start to translate GB 1886.256-2024_English as soon as possible, and keep you informed of the progress. 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