Some standard content:
National Standard of the People's Republic of China
Food additive
Glycerin monostearate (40%)
Food additive
Glycerin monostearate (40%)
1 Subject content and scope of application
GB 1986—89
Replaces 1986---80
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of food additive glyceryl monostearate.
This standard applies to the product formed by esterification of stearic acid and the hydroxyl group in the glycerol molecule, which can be added to food as an emulsifier. Reference Standards
GB8450
GB 8451
Technical Requirements
Chemical Reagents
Chemical Reagents
Chemical Reagents
Chemical Reagents
Standard Solution Preparation Method
Impurity Standard Solution Preparation Method
Preparation Method of Preparations and Products
Freezing Point Determination Method
Determination Method in Food Additives
Limit Test Method for Heavy Metals in Food Additives Appearance: Light yellow waxy solid.
3.2 Physical and Chemical Indicators: See the table below.
Freezing point, ℃
Free acid (calculated as stearic acid), %
Monolithic acid (As), %
Heavy metal (calculated as Pb), %
Iron (Fe), %
Test method
Appearance inspection: visual inspection.
4.2 Physical and chemical index inspection
4.2.1 Iodine value
4.2.1.1 Reagents and solutions
Approved by the Ministry of Light Industry of the People's Republic of China on March 31, 1989
Implementation on January 1, 1990
GB1986-89
Hydrochloric acid (GB622): chemically pure, density 1.19. Potassium permanganate (GB643): chemically pure.
Iodine (GB675): chemically pure.
Glacial acetic acid (GB676): chemically pure.
Chloroform (GB682): chemically pure.
Potassium iodide (GB1272): chemically pure, 15% solution. g. 0.5% starch indicator solution: prepared according to GB603 method. h. 0.05mol/L (0.1N) sodium thiosulfate standard solution: prepared and calibrated according to GB601 method. Chlorine: add hydrochloric acid dropwise to potassium permanganate, and let the generated chlorine gas first pass into a washing bottle containing 1.84 density sulfuric acid and dry it, then pass into the iodine solution. j. Wei's solution: first dissolve 13g iodine in 1000mL glacial acetic acid, and slightly heat it during dissolution. The solution is placed in a 1000mL brown bottle and used as iodine solution after cooling. Pour 100-200 mL from it into another brown bottle and place it in a dark place for adjusting the Wei's solution. Then pass chlorine gas into the remaining iodine solution until its color gradually fades from dark to orange-red and transparent. The amount of chlorine gas introduced should make the amount of sodium thiosulfate solution consumed in the titration close to twice the amount of sodium thiosulfate solution consumed before the chlorine gas was passed. The chlorine gas can also be passed in an appropriate excess, and then adjusted with the iodine solution retained in advance. The correction method is: take 25 mL of iodine solution and newly prepared Wei's solution, add 20 mL of 15% potassium iodide solution to each, and then add 100 mL of distilled water to each, and titrate with 0.05 mol/L (0.1N) sodium thiosulfate solution until the solution is light yellow, add 1~~2 mL of starch indicator solution, and continue titrating until the blue disappears. The amount of sodium thiosulfate solution consumed by the newly prepared Wei's solution should be nearly twice that of the iodine solution. 4.2、1.2 Operation steps
Weigh 2g of sample (accurate to 0.0002g) into an iodine volumetric flask, add 20mL of chloroform, add 10mL of Wei's solution from a burette after the sample is dissolved, shake well, moisten the bottle stopper with a small amount of 15% potassium iodide solution, place in a dark place at 15~20℃ for 30min, then take it out, add 20mL of 15% potassium iodide solution and 100mL of distilled water, and titrate with 0.05mol/L (0.1N) sodium thiosulfate solution until the solution turns light yellow, add 1~2mL of starch indicator solution, and continue to titrate until the blue color of the solution disappears. At the same time, perform a blank test under the same conditions. 4.2.1.3 Calculation
Wherein: X—
iodine value;
X = (Vo - V) Xn× 0. 2538 × 100m
Vo—volume of sodium thiosulfate standard solution used in blank test, mL; V1—volume of sodium thiosulfate standard solution used in sample, mL; n——molar concentration of sodium thiosulfate standard solution, mol/L, m——sample mass, g;
0.2538——millimolar mass of iodine, 8/mol. 4.2.1.4 Allowable difference
The allowable difference between two parallel determination results is 0.20%. 4.2.2 Determination of freezing point
Perform according to the provisions of GB618.
4.2.3 Determination of free acid
4.2.3.1 Reagents and solutions
95% ethanol (GB679): analytical grade.
0.1mol/L sodium hydroxide standard solution: prepared according to GB601 method. b.
1% phenol indicator solution: prepared according to GB603 method. 4.2.3.2 Operation steps
......(1)
Weigh 4g of sample (accurate to 0.001g), place in a conical flask, add 80-90mL neutral ethanol, heat to dissolve, then drip 5-6 drops of phenolphthalein indicator solution, and immediately titrate with 0.1mol/L sodium hydroxide standard solution until it turns slightly red, and maintain it for 30s without fading as the end point. 4
4.2.3.3 Calculation
GB 1986-89
Xi = #×V× 0. 2713 × 100
Wherein: X is the percentage of free acid, %,
n is the molar concentration of sodium hydroxide standard solution, mol/L, V is the volume of sodium hydroxide standard solution consumed in titration, mL; 0.2713 is the average millimolar mass of stearic acid, 8/mol, and m is the mass of the sample, 8.
4.2.3.4 Allowable error
The allowable error of the results of two parallel determinations is 0.02%. 4.2.4 Determination of arsenic
Weigh 1g of sample (accurate to 0.1g) and perform the arsenic spot method by dry digestion in GB8450. 4.2.5 Determination of heavy metals
Weigh 2g of sample (accurate to 0.1g) and proceed according to the dry digestion provisions in GB8451. 4.2.6 Determination of iron
4.2.6.1 Reagents and solutions
Sulfuric acid (GB625): analytical grade, 20% solution. Nitric acid (GB626): analytical grade
Ammonium thiocyanate (GB660): analytical grade, 10% solution. c
Isoamyl alcohol (HB3-996): analytical grade. d,
Iron standard solution: Prepare according to the method of GB602 and dilute 10 times, 1mL contains 0.01mg iron. 4.2.6.2 Operation steps
Weigh 10g of sample, first carbonize with low fire, then ash at 550℃, add 12-15mL nitric acid to the ash, boil for 15min, add 50mL distilled water, filter, dilute the filtrate and washing solution to the scale in a 250mL volumetric flask, and shake well. Pipette 10mL of the above solution into a 100mL colorimetric tube, add 10mL of 10% ammonium thiocyanate solution, 0.5mL of nitric acid, and 0.5mL of 20% sulfuric acid, dilute to the scale with distilled water, and then add 10mL of isoamyl alcohol and shake well.
Take 0.8mL of iron standard solution into a 100mL colorimetric tube, add 10mL of distilled water, 10mL of 10% ammonium thiocyanate solution, 0.5mL of nitric acid, and 0.5mL of 20% sulfuric acid, dilute to the scale with distilled water, and then add 10mL of isoamyl alcohol and shake well.
Take 0.8mL of iron standard solution into a 100mL colorimetric tube, add 10mL of distilled water, 10mL of 10% ammonium thiocyanate solution, 0.5mL of nitric acid, and 0.5mL of 20% sulfuric acid, dilute to the scale with distilled water, and then add 10mL of isoamyl alcohol and shake well. 4.2.6.3 Result processing
The color of the sample tube shall not be darker than that of the standard tube. 5 Inspection rules
5.1 This product shall be inspected by the quality inspection department of the manufacturer, and the manufacturer shall ensure that all products leaving the factory meet the requirements of this standard. Each batch of products leaving the factory shall be accompanied by a quality certificate in a certain format. 5.2 When sampling, samples shall be selected from 10% of the number of boxes in each batch, and the number of small batches shall not be less than 3 boxes. Samples shall be taken evenly from the selected samples, and the sampling mass shall not be less than 100g. Mix the selected samples and divide them into two clean and dry sample bottles, one for analysis and the other for retention. The production date, product name and batch number shall be marked on the sample bottles. 5.3 If any indicator in the inspection results does not meet the requirements of this standard, samples shall be selected from twice the amount of packaging for re-inspection. If the re-inspection results are unqualified, the entire batch of products shall be treated as unqualified. 5.4 If the supply and demand parties have any objection to the product quality, the two parties shall negotiate and the arbitration unit shall conduct arbitration. 6 Marking, packaging, transportation, storagebZxz.net
6.1 The packaging should be painted with a firm mark, marked with the words "food additives", and marked with the manufacturer's name, trademark, product name, production date, batch number and net weight.
GB1986-89
6.2 The packaging of this product is lined with polyethylene bags or clean kraft paper for food, packed in wooden boxes or cartons, and then reinforced with plastic tape. The net weight of each box is 25kg.
6.3 This product should be protected from rain, moisture and sunlight during transportation. Handle it carefully during handling and loading to avoid damage and contamination. 6.4 This product should be stored in a cool and dry warehouse. The room temperature should not exceed 40℃. It should be padded more than 10cm from the ground to prevent moisture. The storage period of this product is one year from the date of production. 6.5 This product shall not be mixed, transported or stacked with toxic substances during storage and transportation. 198689
Monostearic acid glyceraldehyde name description and chemical formula (reference)
A1 Name description
Monostearic acid glyceride in this standard is a mixed glyceride of mono-, distearic acid and palmitic acid. The content of monostearic acid glyceride is about 40%.
A2 Chemical formula
A2.1 Structural formula
CH2OoC(CH2),CHs
n—14.16
A2.2 Empirical formula
n= 19. 21
A3 Molecular weight
According to the international atomic weight in 1983: 358.57. Additional Notes:
This standard is under the jurisdiction of the Food Fermentation Industry Science Research Institute of the Ministry of Light Industry and the Food Sanitation Supervision and Inspection Institute of the Ministry of Health. This standard was drafted by Shanghai Yan'an Oil and Fat Chemical Factory and assisted by Shanghai Food Sanitation Supervision and Inspection Institute. The main drafters of this standard are Cheng Pinguang, Chen Shaowen and Yuan Yicheng. This standard was first issued in October 1980.
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