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1、羧甲基纤维素（Carboxymethyl cellulose）Carboxymethyl celluloseContent analysis; toxicity; limits of use; food additives; maximum permissible use; maximum permissible residue; standard carboxymethylcellulose; reagent grade pricesCarboxymethyl cellulose CAS: 9004-32-4English Name: Carboxymethyl celluloseEngli
2、sh synonyms: B10; cmc2; s75m; 7h3sf; carbo; cmc7h; cmc7m; cmc41a; cmc4h1; cmc4m6Carboxymethyl celluloseChinese synonym: cellulose gum; acid methyl cellulose; carboxymethyl cellulose; sodium carboxymethyl cellulose; carboxymethyl cellulose; sodium carboxymethyl cellulose; carboxymethyl cellulose sodi
3、um carboxymethyl cellulose; 1M6; sodium carboxymethyl cellulose (alkaline); carboxymethyl cellulose (IM6)CBNumber: CB5209844Molecular formula: C6H7O2 (OH) 2CH2COONaMolecular weight: 0MOL File: Mol fileCarboxymethyl cellulose, chemical propertyMelting point: 274 degrees C (Dec.)Density: 1,6 g/cm3Solu
4、bility: H2O:, 20, mg/mL, solubleForm: low viscosityWater solubility: solubleMerck: 141829Stability: Stable., Incompatible, with, strong, oxidizing, agents.EPA chemical information: Cellulose, carboxymethyl, ether, sodium, salt (9004-32-4)security informationDangerous category code: 40Safety instruct
5、ions: 24/25WGK Germany: 1RTECS: FJ5950000F: 3Carboxymethyl cellulose MSDSCarboxymethyl celluloseProperties, uses and production process of carboxymethyl celluloseContent analysisThe percentage of sodium carboxymethyl cellulose is reduced by 100 by subtracting the percentage of the following sodium c
6、hloride and sodium glycolate.The content of sodium chloride is accurate. Take the sample about 5g, remove a 250m1 beaker, add water 50ml and 30% hydrogen peroxide 5ml, heat 20min on the steam bath, and stir occasionally until completely dissolved. Cooling, using silver sulfate and mercury sulfate po
7、tassium sulfate electrode, do not stop stirring, add water 100ml and nitric acid 10ml, and then use 0.05mol/L silver nitrate titration to the end of the potential. Press the formula to calculate the percentage of sodium chloride in the sample:(584.4Vc) / (100-6) Omega, in which V and C are the consu
8、mption of silver nitrate (M1) and concentration (mol/L); 6 is the measured loss of weight; Omega is the mass of the sample (g); and 584.4 is the molecular weight of sodium chloride.The content of sodium glycolate is accurate. The sample is about 500mg and transferred into a 100ml beaker. First, the
9、5ml glacial acetic acid is then wetted with 5ml water, and then stirred to a solution with a glass rod (usually 15min). Slowly add acetone 50ml under agitation, then add sodium chloride, 1g, stirring for a few minutes to make sodium carboxymethyl cellulose all precipitate. The soft coarse filter has
10、 a hole with a small amount of acetone wetted, the filtrate collected in a volumetric flask of 100ml, another 30ml acetone residue and leaching residue move filter paper, then diluted with acetone after constant volume mixing.Prepare standard liquid according to the following: accurately take the gl
11、ycolic acid 100mg overnight in the dryer at room temperature, transfer to a 100ml capacity bottle, dissolve in water, and mix at definite volume.The fluid should be used within 30 days. Transfer the liquid 1.0., 2, 3 and 4.0m1 into four 100ml volumetric flasks, add water to about 5ml, then 5ml with
12、glacial acetic acid, and dilute with acetone.Take the sample liquid 2.0ml and each standard liquid 2.0ml, then move into five 25ml volumetric bottles, and then add a blank bottle containing 5% 2.0ml of acetone, which is composed of glacial acetic acid and water. Do not affix the capacity bottles to
13、20min in the boiling water bath to remove acetone, remove and cool. Each bottle of each 2, 7- dihydroxy naphthalene solution (TS-85) 5.0ml, a strong mixture plus 15ml, and strong mixing. Take thin aluminum cover. Place the volumetric flask vertically in a boiling water bath and keep 20min. Then remo
14、ve it, cool it, and mix it with sulphuric acid.With a proper spectrophotometric meter, with the blank solution for comparison, absorbance at 540nm was measured by liquid, draw the standard curve according to the standard absorbance, then according to the standard curve and the absorbance of samples
15、obtained in the sample quality glycolic acid (mg), and then press the calculate sampletoxicityADI does not make special provision (FAO/WHO, 2001).LD50 (rat, oral) 27g/kg.GRAS (FDA, 182.17452000).Use limitGB 2760-96 (g/kg): 5 - 1.2 instant noodles; solid beverage; popsicles, ice cream, cakes, biscuit
16、s, jelly, puffed food, GMP.FAO/WHO (1984, g/kg), sardines, mackerel, instant soup broth 20; 4000 mg/kg; cottage cheese, whipped cream 5, melted cheese 8, flavor mayonnaise 5000rag/kg.Maximum allowable use of food additives maximum allowable residue levelAdditive Chinese name allows the Chinese name, additive fun
