Some standard content:
ICS67.220.20
National Standard of the People's Republic of China
GB2023—2003
Replaces GB2023-—1980
Food additives
Food additiveLactic acid
Published on 2003-06-13
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on 2003-12-01
All technical contents of this standard are mandatory. Foreword
GB 2023—2003
This standard adopts the "Food Chemical Codex of the United States" FCCIV in a non-equivalent manner. Among them, the chloride and sulfate in the physical and chemical indicators are better than the provisions of FCC.
This standard has revised GB2023--1980 "Food additive lactic acid". The description of lactic acid properties and chromaticity has been added, the index of sulfate in lactic acid has been improved, some technical indicators of L (ten) lactic acid have been added, and the test methods have been given, with the aim of improving the purity and safety of lactic acid.
This standard is proposed by the China Light Industry Federation. This standard is under the jurisdiction of the National Food Fermentation Standardization Center. The drafting units of this standard are: Henan Jindan Lactic Acid Co., Ltd., Shanghai Tianzi Lactic Acid Pharmaceutical Factory, Yancheng Huayou Biochemical Co., Ltd., China Food Fermentation Industry Research Institute, Shanghai Industrial Microbiology Research Institute. The main drafters of this standard are: Fan Yiguo, Wang Ranming, Zhang Peng, Yu Peixing, Gao Hanzhong, Yan Xizhong, Wang Xi'an, Li Shuang, Wu Yuhong, and Wang Jiakuan. The previous versions of the standards replaced by this standard are: GB 2023--1980.
1 Scope
Food Additives
GB 2023--2003
This standard specifies the requirements, test methods, inspection rules, packaging, labeling, transportation and storage of food additive lactic acid. This standard applies to a mixture of lactic acid and lactic anhydride obtained by fermentation of lactobacillus and Rhizopus oryzae with starch and sugar as raw materials. It can be used as a preservative, acidulant, etc. in the food industry. 2 Normative References
The clauses in the following documents become clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T601 Preparation of standard solutions for titration analysis (volumetric analysis) of chemical reagents GB/T602 Preparation of standard solutions for determination of impurities in chemical reagents Preparation of preparations and products used in test methods GB/T 603
Chemical reagents
General method for colorimetric determination (GB/T605-1988, eqvISO63536-1:1982) GB/T 605
Chemical reagents
GB/T 2829
Periodic inspection counting sampling procedures and tables (applicable to the inspection of process stability) 3 Product chemical name, molecular formula, structural formula, relative molecular mass Chemical name: Lactic acid (α-hydroxypropionic acid) Molecular formula: CH.O3
Structural formula: CH:CH(OH)COOH or CHCH—COOH Relative molecular mass: 90.08 (1991 international atomic mass) 4 Requirements
Properties: oily liquid.
4.2 Odor: non-irritating, no peculiar smell.
Physical and chemical indicators are shown in Table 1.
L(+) Lactic acid content in total acid/(%)
Chroma (APHA)
Lactic acid content/(%)
Chloride (as Cl-)/(%)
Sulfate (as SO,2-)/(%)
Iron salt (as Fe)/(%)
L(+) Lactic acid
DL-lactic acid
GB 2023--2003
Ignition residue/(%)
Arsenic (as As =Calculated)/(mg/kg)
Heavy metals (calculated as Pb)/(mg/kg)
Easy carbon compounds
Solubility in ether
Citric acid, oxalic acid, phosphoric acid, tartaric acid
Reducing sugar
Methanol/(%)
Cyanide/(mg/kg)
Test method
Table 1 (continued)
L(+) lactic acid
DL-lactic acid
5.1 Reagents
The reagents and water used in this standard are all analytically pure reagents, distilled water or ion exchange water. The preparation of reagents should comply with the corresponding standards. 5.2 Identification
5.2.1 Reagents and solutions
0.1mol/L potassium permanganate solution: prepare according to GB/T601. 5.2.2 Sample determination
Take the aqueous solution of this product, add potassium permanganate solution, and heat it. The odor of acetaldehyde will be generated. 5.3 Determination of the content of L (+) lactic acid in the total acid content 5.3.1 Instruments and conditions
Chromatograph: liquid chromatography (HPLC);
Detector: wavelength 254nm, sensitivity 0.32AUFS; separation column: MCIGEL-CRS10W (3μ) 4.6IDX50mm (for optical isomer separation); mobile phase: 0.002mol/L copper sulfate (CuSO4·5H2O), flow rate: 0.5mL/min;
Injection volume: 20uL;
Separation degree: lactic acid (0.05%) injection volume 20uL, the separation degree of D and L isomers is above 1.0. 5.3.2 Operation steps
Weigh 0.05g of sample, add water to make up to 100mL, and use high performance liquid chromatography to measure. The retention time of D-lactic acid is 10min, and the retention time of L(+)lactic acid is 12min. From the peak areas Ap and AL of D-lactic acid, calculate the area and obtain the percentage of L(+)lactic acid content [this is called the percentage of L(+)lactic acid in total lactic acid]. 5.3.3 Expression of analysis results
The percentage content X of L(+)lactic acid in total lactic acid is calculated according to formula (1). X =
X 100%
Where:
X, — is the percentage content of L(+)lactic acid in total lactic acid; AL is the peak area of L(+)lactic acid;
Ap is the peak area of D-lactic acid.
5.3.4 Allowable difference
The difference between two parallel determination results shall not exceed 0.2%. The arithmetic mean of the two parallel determinations shall be taken as the determination result. 5.4 Determination of chromaticity
Determination shall be carried out in accordance with GB/T605.
5.5 Determination of lactic acid content
5.5.1 Reagents and solutions
5.5.1.1 Phenol indicator solution, 10g/L, ethanol solution. 5.5.1.2 Sodium hydroxide standard solution, 1mol/L, prepared and calibrated in accordance with GB/T601. 5.5.1.3 Sulfuric acid standard solution, 1mol/L, prepared and calibrated in accordance with GB/T601. 5.5.2 Sample determination
GB 2023—2003
Weigh 1g of sample (accurate to 0.0002g), add 50mL of water, accurately add 40mL of 1mol/L sodium hydroxide standard solution, boil for 5min, add 2 drops of phenolic acid indicator, titrate with 1mol/L sulfuric acid standard solution while hot, and perform a blank test at the same time. 5.5.3 Expression of analysis results
Lactic acid content X2 is calculated according to formula (2).
X = (VV)×c×0. 090 08 × 100%m
Wherein:
X2——Lactic acid content;
V,-volume of sulfuric acid standard solution consumed for titration of blank, in milliliters (mL); V.-—volume of sulfuric acid standard solution consumed for titration of sample, in milliliters (mL); c-—concentration of sulfuric acid standard solution, in moles per liter (mol/L); m—sample mass, in grams (g);
0.09008-——milligram equivalent of lactic acid.
5.5.4 Allowable difference
The difference between the results of two parallel determinations shall not exceed 0.2%. The arithmetic mean of the two parallel determinations shall be taken as the determination result. 5.6 Determination of chloride
5.6.1 Reagents and solutions
5.6.1.1 Nitric acid, 1+9.
5.6.1.2 Silver nitrate solution, 0.1 mol/L. (2)
5.6.1.3 Chloride standard solution, 0.01 mg/mL, prepared according to GB/T602, each 1 mL is equivalent to 0.01 mg of chloride ion. 5.6.2 Sample determination
Preparation of standard tube: Accurately draw 2mL of chloride standard solution and treat it in the same way as the sample. Weigh 2g of sample (weigh to 0.01g) and place it in a 50mL colorimetric tube, add 10mL of nitric acid (1+9) and appropriate amount of water to make the volume 40mL, add 1ml of 0.1mol/L silver nitrate solution, dilute to 50mL with water, shake and place in a dark place for 5min. Turbidimetric comparison with standard tube, the turbidity shall not be deeper than that of standard tube.
5.7 Determination of sulfate
5.7.1 Reagents and solutions
5.7.1.1 Hydrochloric acid solution, 3mol/L.
5.7.1.2 Barium chloride solution, 250g/L.
GB 2023-2003
5.7.1.3 Sulfate standard solution, 0.01mg/mL Prepare and calibrate according to GB/T602, each 1mL is equivalent to 0.1mg sulfate ion.
5.7.2 Sample determination
Preparation of standard tube: Accurately pipette 1.mL sulfate standard solution and treat it in the same way as the sample tube. Weigh 2g of sample (weigh to 0.01g) and place it in a 50mL colorimetric tube, add appropriate amount of water to dilute to 25mL, add 1mL of 3mol/L hydrochloric acid, place it in a 30℃~35℃ water bath for 10min, add 3mL of 250g/L barium chloride solution, shake well, place it for 10min, compare it with the standard, and its turbidity shall not be deeper than that of the standard tube. 5.8 Determination of Iron
5.8.1 Reagents and Solutions
5.8.1.1 Hydrochloric acid solution, 3 mol/L. bzxZ.net
5.8.1.2 Ammonium persulfate.
5.8.1.3 Ammonium thiocyanate solution, 250 g/L. 5.8.1.4 Iron standard solution, prepared and calibrated according to GB/T602, each 1 mL is equivalent to 0.01 mg of iron ion. 5.8.2 Sample Determination
Standard tube: Pipette 1 mL of iron standard solution and treat it in the same way as the sample tube. Weigh 1g of sample, dissolve in water to 25ml, transfer to a 50mL Nessler colorimetric tube, add 4mL of 3mol/L hydrochloric acid and 30mg of ammonium persulfate, dilute with water to about 35mL, add 3mL of 250g/L ammonium thiocyanate solution, dilute with water to 50mL, shake, and compare with the standard tube. The color should not be darker than that of the standard tube. 5.9 Determination of ignition residue
5.9.1 Reagent
Sulfuric acid.
5.9.2 Sample determination
In a crucible that has been burned to constant weight, weigh 2.5g of sample (weighed to 0.0002g), slowly burn until completely carbonized, cool, add sulfuric acid to moisten, heat at low temperature until sulfuric acid fumes are completely removed, burn at 700℃~800℃ until completely carbonized, transfer to a desiccator, cool, weigh accurately, and then burn at 700℃~800℃ to constant weight. 5.9.3 Expression of analysis results
The ignition residue is calculated according to formula (3).
Xs = m2 = m × 100%
mg-mj
Wherein:
X3——ignition residue;
m2-mass of ash added to the crucible after ignition, in grams (g);
m2-mass of ash added to the crucible after ignition, in grams (g);
mass of sample added to the crucible, in grams (g). 5.10 Determination of arsenic
5.10.1 Reagents and solutions
Hydrochloric acid.
5. 10. 1. 1
2 Sulfuric acid.
5. 10. 1. 2
5.10.1.3 Arsenic-free metallic zinc.
5.10.1.4 Potassium iodide solution, 150g/I. (3)
5.10.1.5 Acidic stannous chloride solution: weigh 40g of stannous chloride (SnCl2·2HzO), dissolve it in hydrochloric acid and dilute it to 100mL, then add a few metal tin particles.
5.10.1.6 Lead acetate cotton: soak the absorbent cotton with 5% lead acetate solution, squeeze it dry, dry it at 100℃, and store it in a sealed container. 4
GB2023—2003
5.10.1.7 Mercuric bromide test paper: cut the filter paper into small pieces, immerse it in 5% mercuric bromide ethanol solution, take it out and dry it in a dark place, and store it in a sealed brown bottle.
5.10.1.8 Arsenic standard solution: Prepare and calibrate according to GB/T602, dilute to 100 times before use. Each 1mL is equivalent to 0.001mg arsenic. 5.10.2 Instrument (Figure 1)
100mL standard ground-mouth conical flask:
Unit: mm
Hollow standard ground-mouth stopper;
Airway tube (outer diameter 8.0mm, inner diameter 6.0mm), B connected to C, with a total length of about 180mm; Perforated organic glass stopcock, the upper part of which is a circular plane with a circular hole in the center, the aperture of which is consistent with the inner diameter of the airway tube C, and the lower aperture of which is adapted to the outer diameter of the airway tube C. The top of the airway tube C is inserted into the lower hole of the stopcock, and the tube wall is appropriately matched with the circular hole of the stopcock, and then glued and fixed; E--Organic glass stopcock cover with a circular hole (aperture 6.0mm) in the center, which is tightly matched with D. Figure 1
During the test, put 60mg of lead acetate cotton in the airway C (the height of the tube is 60mm~80mm), and then put a piece of mercuric bromide test paper on the top plane of the stopcock D (the size of the test paper should be able to cover the aperture without being exposed outside the plane), cover the stopcock cover E and tighten it, and it is ready. 5.10.3 Sample determination
Preparation of standard arsenic spots: Accurately draw 1mL of 0.001mg/mL arsenic standard solution, 1mL of arsenic standard solution is equivalent to 0.001mg arsenic, put it in bottle A, and treat it in the same way as the sample (see the following operation). Determination: Weigh 1g of sample (accurate to 0.01g) and place it in bottle A, dilute with water to 23mL, add 5mL of hydrochloric acid, 5mL of 150g/L potassium iodide solution and 5 drops of acidic stannous chloride solution, shake well and place for 10min, add 2g of arsenic-free zinc particles, immediately plug the airway C filled with lead acetate cotton and mercuric bromide test paper on bottle A, place it in a dark place at 25℃～40℃ for 1h, remove the mercuric bromide test paper and compare the color with the standard monument, the color of the mercuric bromide test paper shall not be darker than the standard. 5.11 Determination of heavy metals
5.11.1 Reagents and solutions
5.11.1.1 Ammonia water, 2+3.
5.11.1.2 Hydrochloric acid solution, 3mol/L.
5.11.1.3 Saturated hydrogen sulfide water: Prepare according to GB/T603. 5.11.1.4 30% glacial acetic acid solution.
5.11.1.5 Phenolic acid indicator solution, 10g/L, ethanol solution. 5.11.1.6 Lead standard solution: Prepare and calibrate according to GB/T602, dilute 10 times before use, 1mL contains 0.01mg lead. 5
GB 2023--2003
5.11.2 Sample determination
Weigh 2g of sample (accurate to 0.01g), place in a 50mL colorimetric tube, add 10mL water and 1 drop of 10g/L phenol anhydride indicator solution, add appropriate amount of ammonia water (2+3) solution until it turns pink, add 5mL of 3mol/L hydrochloric acid solution, and dilute with water to 25mL. In another 50mL Nessler colorimetric tube, add 2mL of lead standard solution and 2mL of 30% glacial acetic acid, and dilute with water to 25mL. Add 10 mL of saturated hydrogen sulfide water to the sample tube and the standard tube, shake well, and place in a dark place for 10 minutes. Place them on white paper, and the color of the sample colorimetric tube from above should not be darker than that of the standard tube.
5.12 Determination of calcium salts
5.12.1 Reagents and solutions
5.12.1.1 Ammonia 2+5
Add 400 mL of concentrated ammonia water to 1000 mL.
5.12.1.2 Ammonium oxalate solution, 35 g/L
Add 3.5 g of ammonium oxalate to 100 mL.
5.12.2 Determination method
Take 1.0 g of sample, add 10 mL of water to dissolve, add ammonia water (2 + 5) to neutralize, add a few drops of 35 g/L ammonium oxalate solution, and no turbidity should be produced. 5.13 Determination of easily carbonized compounds
Take 5 mL of 95% sulfuric acid and place it in a clean test tube. Note that 5 mL of this product is added along the wall of the tube to form two liquid layers. Let it stand at 15°C for 15 minutes. The color of the interface should not be darker than light yellow. 5.14 Determination of solubility in ether
Dissolve 1 g of lactic acid in 25 mL of ether. The solution should not be more turbid than the solvent used for the test. 5.15 Determination of citric acid, oxalic acid, phosphoric acid and tartaric acid 5.15.1 Reagents and solutions
5.15.1.1 Calcium chloride solution, 75 g/L Take 7.5 g of calcium chloride and add water to dissolve it into 100 mL. 5.15.1.2 Ammonia water, 2+5 Add water to 400 mL of concentrated ammonia water to 1000 mL. 5.15.2 Determination method
Take 0.5g, add appropriate amount of water to make 5mL, mix well, adjust to slightly alkaline with ammonia test solution, add 1mL of calcium chloride test solution, heat in a water bath for 5min, and no turbidity should be generated.
5.16 Determination of reducing sugar
5.16.1 Reagents and solutions
5.16.1.1 Copper sulfate.
5.16.1.2 Potassium sodium tartrate.
5.16.1.3 Sodium hydroxide solution, 200g/L. 5.16.1.4 Basic copper tartrate solution: Take 6.93g of copper sulfate crystals and add water to dissolve it into 100mL; take 34.6g of potassium sodium tartrate crystals and dissolve it with 10g of sodium hydroxide and water into 100ml, and mix the two liquids at the same time. 5.16.2 Determination method
Take 0.1g of sample, add 10mL of water to mix, adjust to neutral with 200g/L sodium hydroxide solution, add 6mL of alkaline copper tartrate solution, heat and boil for 2min, and no red precipitate should be generated. 5.17 Determination of methanol
5.17.1 Reagents and solutions
5.17.1.1 Calcium carbonate.
5.17.1.2 98% sulfuric acid.
5.17.1.3 5% phosphoric acid solution.
4 Sodium sulfite solution, 250/L.
5. 17. 1. 4
Chromotropic acid test solution: Weigh 0.5g of chromotropic acid and add 30mL of concentrated sulfuric acid to make a suspension, centrifuge and take the supernatant. 5.17.1.5
GB 2023--2003
5.17.1.6 Standard methanol solution: Accurately pipette 1 mL of anhydrous methanol and dilute to 100 mL with water. Accurately pipette 1 mL and dilute to 100 mL with water before use.
5.17.1.7 Potassium permanganate solution: Weigh 3.3 g of potassium permanganate and dissolve it in 1050 mL of water. Boil slowly for 15 min. After cooling, seal and store in a dark place for two weeks. Filter with a No. 4 glass sand core funnel into a dry brown bottle (the glass sand core funnel used to filter potassium permanganate should first be boiled slowly for 5 min with potassium permanganate solution, and the collection bottle should also be washed 2~~3 times with potassium permanganate solution). 5.17.2 Determination method
Take 5 mL of the sample, add 8 mL of water and 5 g of calcium carbonate, then distill it, take about 5 mL of the initial distillate, add water to 100 mL as the test solution; take 1 mL of this solution, add 0.1 mL of 5% phosphoric acid, add 0.2 mL of 0.1 mol/L potassium permanganate solution, let it stand for 10 minutes, then add 0.3 mL of 250/L sodium sulfite solution, add 3 mL of 98% sulfuric acid, add 0.2 mL of chromic acid test solution and shake the hook. If color appears, immediately compare it with the standard colorimetric control solution prepared by the same method with 1 mL of standard methanol solution. The sample under test shall not be darker than the control solution. 5.18 Determination of cyanide
5.18.1 Reagents and solutions
5.18.1.1 Standard potassium cyanide solution: Accurately weigh 25 mg of potassium cyanide, place it in a 100 mL volumetric flask, add water to dissolve and dilute to the scale, and shake well. When using, accurately measure 5 mL, place in a 250 mL volumetric flask, add water to dilute to the mark, shake well, and the solution is ready (each 1 mL is equivalent to 2 μg of CN). This solution should be freshly prepared.
5.18.1.2 Lithium trinitrophenolate test solution: Take 0.25 g of lithium carbonate and 0.5 g of trinitrophenol, add 80 mL of boiling water, dissolve, cool, and add water to make 100 mL.
5.18.2 Instrumentation (Figure 2)
Lithium trinitrophenolate
Test solution (1mL)
Test solution or
Control solution (5mL)
5.18.3 Determination method
Put 0.4g of the sample into bottle A, add water to 5mL, shake, and immediately put cup B with 1mL of lithium trinitrophenolate test solution into bottle A, seal it tightly and place it in a dark place overnight; take out cup B, accurately add 2mL of water into cup B, mix well, and measure the absorbance at a wavelength of 500nm by ultraviolet spectrophotometry, and compare it with 1.0mL of standard potassium cyanide solution added with water to 5mL. The absorbance obtained by the same operation as above shall not be greater.
6 Inspection rules
6.1 This product shall be inspected by the quality inspection department of the manufacturer. The manufacturer shall ensure that the products meet the requirements of this standard, and each batch of products leaving the factory shall be accompanied by a quality certificate.
GB 2023—2003
6.2 Products in the same production cycle shall be considered as batches. 6.3 Conduct random inspections in accordance with GB/T2829. Open the glass sampling tube, draw 50mL~100mL of sample from each barrel, inject into the mixer and mix evenly, and put into two clean, dry glass bottles with frosted stoppers. Label the bottles with the manufacturer name, product name, batch number, quantity and sampling date. One bottle is used for inspection, and the other is kept for reference. 6.4 Factory inspection: Lactic acid content, iron salt, chloride and color index are mandatory inspection items. 6.5 Type inspection: All physical and chemical indicators in the technical requirements are type inspection items, which shall be inspected every six months, or when one of the following situations occurs.
a) When there are major changes in raw and auxiliary materials;
b) When replacing equipment or resuming production after suspension; When there are major differences between the factory inspection and the last type inspection results;c)
d) When the national quality supervision and inspection agency makes a sampling inspection request. 6.6 If the inspection results do not meet this standard, samples should be taken from twice the amount of packaging for re-inspection. If even one item in the re-inspection results does not meet this standard, the entire batch of products will be judged as unqualified. 6.7. When the supply and demand parties have objections to product quality and need arbitration, the two parties may negotiate to select an arbitration agency. Arbitration shall be conducted in accordance with the inspection methods specified in this standard.
7 Packaging, marking, transportation and storage
7.1 The product is packed in food-grade polyethylene plastic barrels and stored in a sealed manner. The net content of each barrel is 25kg or 250kg (or as required by the customer). 7.2 The product packaging should be firmly marked with the product name, manufacturer name, factory address, health license number, trademark, product model, batch number, production date, shelf life, main parameters of the product, net content and product standard number, and marked with the words "food additives". 7.3 This product should be stored in a dry, ventilated and cool warehouse to prevent contamination. 7.4 During transportation, it should be strictly prevented from being exposed to sunlight, rain and mixed with toxic and harmful substances. 7.5 This product has a shelf life of two years from the date of production if the packaging is intact and unsealed.3mL, add 3mL of 98% sulfuric acid, add 0.2mL of chromic acid test solution and shake the hook. If color is developed, immediately compare it with the standard colorimetric control solution prepared by the same method with 1mL of standard methanol solution. The sample under test shall not be darker than the control solution. 5.18 Determination of cyanide
5.18.1 Reagents and solutions
5.18.1.1 Standard potassium cyanide solution: Accurately weigh 25mg of potassium cyanide, place it in a 100mL volumetric flask, add water to dissolve and dilute to the scale, shake well. When using, accurately measure 5mL, place it in a 250mL volumetric flask, add water to dilute to the scale, shake well, and obtain (each 1mL is equivalent to 2μg of CN). This solution should be freshly prepared.
5.18.1.2 Lithium trinitrophenolate test solution: Take 0.25g of lithium carbonate and 0.5g of trinitrophenol, add 80mL of boiling water, dissolve, cool, and add water to 100mL.
5.18.2 Instrumentation (Figure 2)
Lithium trinitrophenolate
Test solution (1mL)
Test solution or
Control solution (5mL)
5.18.3 Determination method
Put 0.4g of the sample into bottle A, add water to 5mL, shake, and immediately put cup B with 1mL of lithium trinitrophenolate test solution into bottle A, seal it tightly and place it in a dark place overnight; take out cup B, accurately add 2mL of water into cup B, mix well, and measure the absorbance at a wavelength of 500nm by ultraviolet spectrophotometry, and compare it with 1.0mL of standard potassium cyanide solution added with water to 5mL. The absorbance obtained by the same operation as above shall not be greater.
6 Inspection rules
6.1 This product shall be inspected by the quality inspection department of the manufacturer. The manufacturer shall ensure that the products meet the requirements of this standard, and each batch of products leaving the factory shall be accompanied by a quality certificate.
GB 2023—2003
6.2 Products in the same production cycle shall be considered as batches. 6.3 Conduct random inspections in accordance with GB/T2829. Open the glass sampling tube, draw 50mL~100mL of sample from each barrel, inject into the mixer and mix evenly, and put into two clean, dry glass bottles with frosted stoppers. Label the bottles with the manufacturer name, product name, batch number, quantity and sampling date. One bottle is used for inspection, and the other is kept for reference. 6.4 Factory inspection: Lactic acid content, iron salt, chloride and color index are mandatory inspection items. 6.5 Type inspection: All physical and chemical indicators in the technical requirements are type inspection items, which shall be inspected every six months, or when one of the following situations occurs.
a) When there are major changes in raw and auxiliary materials;
b) When replacing equipment or resuming production after suspension; When there are major differences between the factory inspection and the last type inspection results;c)
d) When the national quality supervision and inspection agency makes a sampling inspection request. 6.6 If the inspection results do not meet this standard, samples should be taken from twice the amount of packaging for re-inspection. If even one item in the re-inspection results does not meet this standard, the entire batch of products will be judged as unqualified. 6.7. When the supply and demand parties have objections to product quality and need arbitration, the two parties may negotiate to select an arbitration agency. Arbitration shall be conducted in accordance with the inspection methods specified in this standard.
7 Packaging, marking, transportation and storage
7.1 The product is packed in food-grade polyethylene plastic barrels and stored in a sealed manner. The net content of each barrel is 25kg or 250kg (or as required by the customer). 7.2 The product packaging should be firmly marked with the product name, manufacturer name, factory address, health license number, trademark, product model, batch number, production date, shelf life, main parameters of the product, net content and product standard number, and marked with the words "food additives". 7.3 This product should be stored in a dry, ventilated and cool warehouse to prevent contamination. 7.4 During transportation, it should be strictly prevented from being exposed to sunlight, rain and mixed with toxic and harmful substances. 7.5 This product has a shelf life of two years from the date of production if the packaging is intact and unsealed.3mL, add 3mL of 98% sulfuric acid, add 0.2mL of chromic acid test solution and shake the hook. If color is developed, immediately compare it with the standard colorimetric control solution prepared by the same method with 1mL of standard methanol solution. The sample under test shall not be darker than the control solution. 5.18 Determination of cyanide
5.18.1 Reagents and solutions
5.18.1.1 Standard potassium cyanide solution: Accurately weigh 25mg of potassium cyanide, place it in a 100mL volumetric flask, add water to dissolve and dilute to the scale, shake well. When using, accurately measure 5mL, place it in a 250mL volumetric flask, add water to dilute to the scale, shake well, and obtain (each 1mL is equivalent to 2μg of CN). This solution should be freshly prepared.
5.18.1.2 Lithium trinitrophenolate test solution: Take 0.25g of lithium carbonate and 0.5g of trinitrophenol, add 80mL of boiling water, dissolve, cool, and add water to 100mL.
5.18.2 Instrumentation (Figure 2)
Lithium trinitrophenolate
Test solution (1mL)
Test solution or
Control solution (5mL)
5.18.3 Determination method
Put 0.4g of the sample into bottle A, add water to 5mL, shake, and immediately put cup B with 1mL of lithium trinitrophenolate test solution into bottle A, seal it tightly and place it in a dark place overnight; take out cup B, accurately add 2mL of water into cup B, mix well, and measure the absorbance at a wavelength of 500nm by ultraviolet spectrophotometry, and compare it with 1.0mL of standard potassium cyanide solution added with water to 5mL. The absorbance obtained by the same operation as above shall not be greater.
6 Inspection rules
6.1 This product shall be inspected by the quality inspection department of the manufacturer. The manufacturer shall ensure that the products meet the requirements of this standard, and each batch of products leaving the factory shall be accompanied by a quality certificate.
GB 2023—2003
6.2 Products in the same production cycle shall be considered as batches. 6.3 Conduct random inspections in accordance with GB/T2829. Open the glass sampling tube, draw 50mL~100mL of sample from each barrel, inject into the mixer and mix evenly, and put into two clean, dry glass bottles with frosted stoppers. Label the bottles with the manufacturer name, product name, batch number, quantity and sampling date. One bottle is used for inspection, and the other is kept for reference. 6.4 Factory inspection: Lactic acid content, iron salt, chloride and color index are mandatory inspection items. 6.5 Type inspection: All physical and chemical indicators in the technical requirements are type inspection items, which shall be inspected every six months, or when one of the following situations occurs.
a) When there are major changes in raw and auxiliary materials;
b) When replacing equipment or resuming production after suspension; When there are major differences between the factory inspection and the last type inspection results;c)
d) When the national quality supervision and inspection agency makes a sampling inspection request. 6.6 If the inspection results do not meet this standard, samples should be taken from twice the amount of packaging for re-inspection. If even one item in the re-inspection results does not meet this standard, the entire batch of products will be judged as unqualified. 6.7. When the supply and demand parties have objections to product quality and need arbitration, the two parties may negotiate to select an arbitration agency. Arbitration shall be conducted in accordance with the inspection methods specified in this standard.
7 Packaging, marking, transportation and storage
7.1 The product is packed in food-grade polyethylene plastic barrels and stored in a sealed manner. The net content of each barrel is 25kg or 250kg (or as required by the customer). 7.2 The product packaging should be firmly marked with the product name, manufacturer name, factory address, health license number, trademark, product model, batch number, production date, shelf life, main parameters of the product, net content and product standard number, and marked with the words "food additives". 7.3 This product should be stored in a dry, ventilated and cool warehouse to prevent contamination. 7.4 During transportation, it should be strictly prevented from being exposed to sunlight, rain and mixed with toxic and harmful substances. 7.5 This product has a shelf life of two years from the date of production if the packaging is intact and unsealed.
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