Some standard content:
GB4571--1996
Lac red pigment is a natural food pigment extracted from the purple stalks of the insect Kerria Lacca secretion. Compared with other natural food pigments, it has high purity, strong coloring power, and good stability to light and heat. At the National Food Additives Conference held in Tianjin in 1974, it was formally recommended that lac red pigment be used as a natural food pigment. In 1984, the national standard for food additive lac red pigment was approved and issued. In order to improve the quality of products and meet the needs of domestic and foreign markets, it is very necessary to revise the national standard for food additive lac red pigment in a timely manner.
In this standard, the index parameter of the key indicator item absorbance is increased from 0.62 to 0.65. Compared with the original standard, this standard removes the two indicator items of copper and mercury: and adds the indicator item of heavy metals, whose index parameter is set at 30mg/kg.
This standard will replace GB4571-84 from the date of entry into force. This standard is proposed by the Ministry of Forestry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Food Additives. This standard was drafted by the Institute of Forest Products Chemical Industry of the Chinese Academy of Forestry and the Health and Epidemic Prevention Station of Jiangsu Province. The main drafters of this standard are Gan Qigui, Zhou Shunan and Yang Luan. This standard was first issued on July 11, 1984. -100
National Standard of the People's Republic of China
Food additive--Lac dye
GB4571-1996
Replaces GB 4571--84
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements for food additive lac red dye.
This standard applies to food additive lac red dye produced by the hydrochloric acid method using lac raw gum as raw material. This product can be used as a food colorant.
Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB 601—88
GB 602--88
GB 603—88
Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents Preparation of standard solutions for determination of impurities in chemical reagents Preparation of preparations and products used in chemical reagent test methods GB 6682--92
GB 8449—87
GB 8450--87
Specifications and test methods for water for analytical laboratories Determination of lead in food additives
Determination of arsenic in food additives
Test method for heavy metal limits in food additives GB 8451—87
3 Technical requirements
3.1 Appearance
This product is bright red powder.
3.2 Particle size
100% of this product passes through a standard sieve of 80 mesh.
3.3 Quality indicators
Should meet the requirements of Table 1.
Approved by the State Administration of Technical Supervision on November 27, 1996 and implemented on July 1, 1997
Absorbance (E8, 490nm)
Loss on drying, %
Residue on ignition, %
Lead (Pb), mg/kg
Arsenic (As), mg/kg
Heavy metals (in terms of Pb), mg/kg
4 Test methods
GB 4571-1996
The reagents and water used in this standard, unless otherwise specified, refer to analytically pure reagents and grade 3 water that meets the requirements of GB6682. The required standard solutions, impurity standard solutions, preparations and products in the reagents shall be prepared in accordance with the provisions of GB601, GB602 and GB603 unless other requirements are specified.
4.1 Sampling
The samples for inspection shall be drawn from each batch of products at 5% to 10% from different parts of each cylinder. The samples shall be fully mixed and divided into 200g by quartering method and packed into two sample bags, one of which shall be sealed and stored in a dry place for arbitration and the other for inspection. 4.2 Appearance and particle size
Weigh 20g of the sample and observe the color visually; then use a 80-mesh standard sieve to determine the particle size. 4.3 Identification
Lac red pigment is a mixture of natural organic acids. Its solubility in water at 20C is 0.03358 and its solubility in 95% ethanol is 0.916g. It is easily soluble in sodium bicarbonate, sodium carbonate and sodium hydroxide solutions. In a solution with a pH value greater than 6, it is easy to react with metal ions other than alkali metals to form a water-insoluble lake. The color of the solution changes with the pH value. When the pH value is less than 4, it is orange-yellow, when the pH value is 4.0-5.0, it is orange-red, and when the pH value is greater than 6, it is purple-red.
4.4 Determination of absorbance
4.4.1 Principle
The purity of the sample is indicated by measuring the absorbance of the sample solution at a specific wavelength. 4.4.2 Instruments and equipment
Spectrophotometer with a 0.5 cm glass colorimetric blood. 4.4.3 Reagents and solutions
a) Anhydrous sodium carbonate (GB639): 10g/L solution; b) Hydrochloric acid (GB622): 0.1mol/L solution; c) Potassium hydrogen phthalate (GB1291): 0.1mol/L solution; d) pH=3.0 buffer solution: Take 50mL of 0.1mol/L potassium hydrogen phthalate solution in a 100mL volumetric flask, add 22.3mL of 0.1mol/L hydrochloric acid solution, dilute with water to the mark, and shake well. 4.4.4 Analysis steps
Weigh 0.1g of the sample, accurate to 0.0002g, place it in a 150mL beaker, add 10mL of 10g/L sodium carbonate solution, stir and dissolve, pour into a 100mL volumetric flask, wash the beaker with a small amount of water, add the washing solution into the 100mL volumetric flask, dilute with water to the mark, and shake well. Accurately draw 10mL and place it in a 100mL volumetric flask, adjust the pH to about 3.0 with 0.1mol/L hydrochloric acid solution, dilute to the scale with pH=3.0 buffer solution, and shake well. This is the sample solution. Place the sample solution in a 0.5cm cuvette and measure the absorbance at a wavelength of 490nm on a spectrophotometer. GB 45711996
The concentration of the sample solution should be such that the measured absorbance is in the range of 0.2~0.7 for the best. When the absorbance of the sample solution E°.1%>0.?, the sample solution can be diluted to an appropriate concentration with pH=3.0 buffer solution and then measured. The absorbance (a) can be calculated according to formula (1) to calculate the absorbance E51\ specified in the cost standard.
Where: α——-absorbance of the diluted sample solution minus the concentration of the diluted sample solution (m/V), %. 4.5 Determination of loss on drying
4.5.1 Principle
At the specified temperature, dry the sample to constant weight, and then measure the reduced mass of the sample. 4.5.2 Instruments and equipment
Weighing bottle, diameter 5cm, height 3cm.
4.5.3 Analysis steps
Weigh 2g±0.1g of the sample with an accuracy of 0.0002g, place it in a weighing bottle that has been dried to constant weight at 105℃±2℃, put it in a 105℃±2℃ oven, and dry it to constant weight.
4.5.4 Analysis results
The loss on drying (X,) expressed as mass percentage is calculated according to formula (2). X
Where: m,—mass of weighing bottle and sample before drying, g; m2-——mass of weighing bottle and sample after drying + g; mass of sample, B.
X 100 :
(2)
The difference between the results of two parallel determinations shall not exceed 0.2%. The arithmetic mean shall be taken as the determination result (accurate to the first decimal place). 4.6 Determination of ignition residue
4.6.1 Principle
Weigh the inorganic substances remaining after the sample is carbonized and ignited at high temperature. 4.6.2 Instruments and equipment
High-temperature electric furnace (controllable temperature 750℃±25℃): 30mL of porcelain. 4.6.3 Analysis steps
Weigh 38±0.18 of the sample, accurate to 0.0002g, and place it in porcelain that has been ignited to constant weight at 750℃±25℃. Slowly heat it on the electric furnace to carbonize it until there is no obvious smoke. Then move it into the high-temperature electric furnace and ignite it at 750℃±25℃ to constant weight. 4.6.4 Analysis results
The weight of the ignition residue expressed as a percentage by mass (X,) is calculated according to formula (3). Xg = m2m × 100 Www.bzxZ.net
Where: ms—the mass of the crucible and the residue g:
m:——the mass of the crucible·g;
m——the mass of the sample + more.
The difference between the results of two parallel determinations shall not exceed 0.05%, and the arithmetic mean shall be taken as the determination result (accurate to the second decimal place). 4.7 Determination of pH value of aqueous solution
4.7.1 Principle
Immerse the specified indicator electrode and reference electrode in the same solution to be tested to form a primary cell, whose electromotive force is related to the pH value of the solution. The pH value of the solution can be obtained by measuring the electromotive force of the primary cell. 403
4.7.2 Instruments and equipment
a) Acidity meter: accuracy is 0.1 pH unit, b) Indicator electrode - glass electrode;
c) Reference electrode - saturated calomel electrode.
4.7.3 Analysis steps
GB 4571-1996
Weigh about 0.034g of the sample (accurate to 0.0002g), place it in a 150mL clean beaker, add 100mL of water to make a saturated solution at room temperature. Use an acidity meter to measure its pH value + pH value reading is stable for at least 1min. 4.8 Determination of lead (Pb)
Determine according to GB8449. Sample treatment adopts 4.2.1 wet digestion. 4. 9 Determination of arsenic (As)
Determine according to Chapter 1 of GB8450-87, silver diethylamino dithiocarboxylate colorimetric method (absorption liquid A), and the sample adopts 1.4.2.1 wet digestion.
4.10 Determination of heavy metals
Determine according to GB8451.
5 Inspection rules
5.1 Food additive lac red pigment shall be inspected and accepted by the product quality inspection department of the manufacturer. The manufacturer shall ensure that the quality of the products shipped meets the requirements of this standard, and the product certificate shall be attached to the packaging. 5.2 The user unit may verify whether the product quality meets the requirements of this standard according to the provisions of this standard. 5.3 If any of the test results do not meet the requirements of this standard, a sample should be taken from the double amount of packaging for re-testing. If there is still one unqualified item in the re-testing results, the batch of products cannot be accepted. 6 Packaging, marking, transportation, storage
6.1 Packed in iron cylinders lined with polyethylene plastic bags, with a net weight of 2.5kg or 1kg per cylinder, and iron cylinders plus cartons. If the user has special requirements for packaging, the supply and demand parties shall negotiate to resolve. 6.2 There should be obvious markings on the packaging, including: product name, standard number, manufacturer name, manufacturer address, trademark, specification, batch number, net weight, gross weight and production date.
6.3 Each cylinder of product leaving the factory should be accompanied by a product quality certificate, including: product name, manufacturer name, batch number, production date, net weight, usage instructions, proof that the product quality complies with this standard and standard number. 6.4 The transport package should be handled with care and must be protected from rain, moisture and sunlight during transportation. It should be stored in a dry, cool warehouse. 6.5 During storage and transportation, this product must not be mixed, transported, or stacked together with toxic, colored, or odorous substances.
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