Some standard content:
Light Industry Industry Standard of the People's Republic of China
1 Subject content and scope of application
QB 1500—1992
This standard specifies the product classification, technical requirements, test methods, inspection rules and labeling, packaging, transportation and storage requirements of monosodium glutamate. This standard is applicable to all kinds of monosodium glutamate that is compounded by adding edible salt or flavor enhancers to monosodium glutamate and whose sodium glutamate content is not less than 80%.
This standard does not apply to sodium glutamate (99% monosodium glutamate) and condiments with a sodium nitrate content of less than 80%. 2 Reference standards
Chemical reagent titration analysis (volume analysis) for the preparation of plate push solution GB 601
GB4456
GB 5461
GB6682
GB 7718
GB 8967
GR 10795
GF 10796
Chemical reagents
Preparation of standard solution for determination of impurities
Polyethylene blown film for packaging
Edible salt
Specification of water for laboratory air
General standard for food labeling
Monosodium glutamate
Food additives
Sodium guanylate
Food additives Monosodium 5°-guanylate
GB/r 1246?
3 Terminology
Determination of Sodium Nitride in Food
3.1 Monosodium Glutamate (trade name 99% MSG) refers to monosodium α-aminopentanoic acid → hydrate (abbreviated as MSG) obtained by fermenting carbohydrates (starch, molasses, sugar and other raw materials) or hydrolyzing protein.
3.2 Monosodium Glutamate (MSG)
refers to a homogeneous mixture in which edible salt is quantitatively added to sodium glutamate, and the content of sodium glutamate is not less than 80%. 3.3 Special (Strong) Monosodium GlutamatebZxz.net
refers to a mixture in which sodium nucleotide (5'-guanylate disodium (arrow called C:MP) or flavor nucleotide) is quantitatively added to MSG Sodium (abbreviated as IMP+GMP or WMP), and other flavor enhancers, its umami taste exceeds that of sodium glutamate. 4 Product classification
4.1 Salt-containing MSG
95% MSG: less than 5.0% edible salt is added, the product code is 213. 90% MSG: less than 10.9% edible salt is added, the product code is 214, 80% MSG: less than 20.3% edible salt is added, the product code is 215. 4.2 Special fresh (strong) MSG
The Ministry of Light Industry of the People's Republic of China approved on June 8, 1992 and implemented on February 1, 1993
4.2.198% Special fresh (strong) MSG
QB 1500—1992
In 98% glutamate, add (.8% 5°-guanylate disodium, product code is T232g: In 98% sodium glutamate, add 1.5% sodium nucleotide, product code is T212w 4.2.2
95% special fresh (strong) MSG
In 95% MSG, add 0.8% 5°-guanylate disodium, product code is 1213g; In 95% MSG, add 1.5% sodium nucleotide, product code is T213w. 90% special fresh (strong) MSG
In 90% rice essence, add 0.8% 5°-ornithine disodium - product code is T214g: In 90% rice essence, add 1.5% sodium nucleotide, product code is r214w. 80% Special Fresh (Strong) MSG
In 80% MSG, add 0.8% 5° disodium guanylate, the product code is T216g; h.
In 80% MSG, add 1.5% sodium guanylate, the product code is T215w. 5 Technical Requirements
5.1 Auxiliary Material Requirements
5. 1. 1 Edible Salt
Should comply with the provisions of GE5161 for refined salt.
5.1.2 Sodium 5'-guanylate
shall comply with the provisions of GB10/95.
5.1.3 Disodium 5'-guanylate
shall comply with the provisions of GB 10796.
5.2 Appearance and sensory requirements
5.2.1 Salt-containing MSG
shall be uniform white fine crystals (smaller than 39 mesh) from color powder, easily soluble in water, free of impurities and with special umami flavor.
5.2.2 Special umami (strong) flavor
shall be white, off-white powder or small granules (smaller than 30g), easily soluble in water, free of impurities visible to the naked eye, with special umami flavor, the umami flavor of which is equivalent to or exceeds 1.5 times that of 80% MSG.
5.3 Physical and chemical requirements
5.3.1 Salt content of MSG
See Table 1
Sodium glutamate,
North rate,
Edible salt (in terms of aCF).
Top ten weight loss, for
Iron, mg/hg
Quadate (in terms of),
$ank/kg
Species (in terms of As), ug/kg
Heavy metals (in terms of Pb), mg/k
5.3.2 Special (strong) flavor
See Table 2,
Sodium glutamate,
Sodium nucleotide,
Light protection rate,
Edible salt (quasi-Natl Loss on drying, %
Iron, mg/kg
Sulfate (as S), %
Zinc, mg/kg
(as Aiug/kg
Heavy metals < as Pb H), mg/kg
Note: 1) The content stated on the product label, 6
Test method
QB 1500—1992
Continued Table 1
Sodium 5'-guanylate
220. 8(g)
Tea with sodium mannate
10-X+-g(w]
The water used in this method shall comply with GB6682 Grade III or above water requirements: All reagents used are analytically pure unless otherwise specified. For the same index, if there are two test methods, the first method shall be used as the supplementary method. 6.1 Appearance and sensory inspection
Appearance: Sprinkle the sample on white filter paper and use the visual method to check its appearance quality and impurities. Sensory: Contains 0.2% aqueous solution of glutamate and 0.1% aqueous solution of monosodium glutamate. Taste its umami taste. 6.2 Amino acid content
6.2.1 Principle
Sodium nitrate contains asymmetric carbon origin, which is optically active and can rotate the polarized light plane to a certain angle. The optical rotation can be measured by a polarimeter to calculate the sodium glutamate content. 6.2.2 Instrument
Polarimeter: Accuracy
[5.01°, sodium light! (sodium spectrum) line 589.3tm). Thermometer: Graduation value 0.1C.
6.2.3 Reagents
1+1 hydrochloric acid aqueous solution.
6.2.4 Analytical steps
6.2.4.1 Preparation of test samples
QB 1500-1992
Mix the sample thoroughly, divide it into small pieces, and grind it into fine powder. Weigh the sample 10.0000% directly to 0.0002g, add 20mL of water and 40mL of 1-1 hydrochloric acid solution, stir it thoroughly to dissolve it completely, and cool it. Transfer it to a 100mL container, adjust the solution to room temperature, and stabilize it with isothermal water, mix it and set it aside. Note: If the small package is 50g/bag, at least 10 pieces (total volume is 100g) should be taken according to the provisions of 7.3 and 3.2, and mixed thoroughly, divided into small pieces, and then weighed. 6.2.4.2 Determination
Turn on the polarimeter and adjust the zero point after it stabilizes. Place the test solution in a 2dm light arm (no air should be present in the test solution), place it in the instrument, and measure its rotation with the light: record the rotation of the test solution,
6.2.5 Calculation
X25.16 +0. 047X(20)
Where: 1. The content of sodium glutamate in the sample, %, α - the actual rotation of the test solution,
L - the thickness of the liquid layer (the length of the optical rotation layer), 1m: the mass of the sample in 1mL of the test solution g
25.16 - the specific rotation of sodium glutamate, [aI;.047 - temperature correction coefficient:
t - the temperature of the test solution during determination, C.
The calculation result should be rounded to one decimal place.
6.2.6 The allowable error of the result
The relative error of 95% MSG and 90% MSG shall not exceed 0.3% and that of +80% MSG shall not exceed 0.3%. 6.3 Nucleoside sodium content
6.3.1 Principle
5° guanylate.….Sodium and sodium prenucleotide have maximum absorption at wavelengths of 260 and 250trm, respectively. Determine their absorbance and calculate their molar absorption coefficients.
UV spectrophotometer wavelength 200~400nm:
Analytical balance sensitivity 0.1mg
6.3.3 Reagents and solutions
1mol/L hydrochloric acid solution prepared according to GB 60:
c.mal/E hydrochloric acid braid Dilute 1mol/L hydrochloric acid solution accurately by 1 times. 6.3.4 Analysis steps
Weigh 5.0000g of sample, accurate to C.0002g, dissolve and dilute to 100mL with 0.01mg/L hydrochloric acid solution, take 5.0UmL of the above test solution, dilute to 100ml with 0.01mol/L hydrochloric acid solution, use a 10mm colorimetric cup, and use 0.01ml/L hydrochloric acid solution as blank. Measure its absorbance at 2h0nm and 250nm respectively. Calculate the following using the AA table:
6.3.5
6.3.5.1 5'-guanosine disodium
400×533X4,
12.2×103×1000
Wherein: X. The maximum content of 5'-guanosine disodium in the sample, %400-400% dilution factor;
The molecular weight of 5'-guanosine disodium:
12.2×103-1000
The absorbance of 5'-guanosine disodium at a wavelength of 200 mm 6.3.5. 2 is sodium nucleotide
400×530×4
X2=11.55×10-×1000
Where: X, is the amount of sodium nucleotide in the sample; 40··Dilution multiple
530——the average molar absorption coefficient of sodium nucleotide; 11.9×10:: A. is the absorbance of sodium nucleotide at a wavelength of 250r:, the calculated result retains decimal places.
6.3.6 Allowable error of the result
-The relative error shall not exceed 1.5%. 6.4 Transmittance
Determine according to GB 8967 4 5.2.2.
6.5 Sodium chloride
6.5.1 The first method is determined according to GB/F 12457. 6.5.2 The second method
6.5.2.1 Principle
Silver nitrate reacts with chloride to produce white silver chloride precipitate, and reacts with chromic acid to produce brick red silver chromate precipitate. Since the solubility of silver chloride is lower than that of silver chromate, the oxidized substance can precipitate first. After the reaction of the oxidized substance with silver nitrate is completed, the excess silver nitrate reacts with potassium chromate, which is brick red and indicates the end point. The reaction formula is: AgNO-NaCl+Ag('I+ +NaNO.
2AgNO.+K,CrO,-ACrO. + +2KNO6.5.2.2 Reagents and solutions
0.1mol/L silver chromate solution is determined according to GB 502 Preparation and calibration, potassium chromate indicator solution Weigh 5g potassium chromate. Add 5mL water solution, add 0.1mol/L silver nitrate until red precipitate appears, leave overnight, filter and set aside.
6.5.2.3 Analysis steps
Weigh about 10g of sample, accurate to U.0002g: add water solution and dilute to 100tml. Absorb test solution according to the following requirements:
95% monosodium glutamate: absorb 25.00mL of test solution;
90% monosodium glutamate: absorb test solution [0. 0CtaL;
80% special essence and special flavor MSG: Pipette 5.00ml of test solution.+Pipette test solution into a 25mL conical flask, add water to 50ml..Add 1mL of chromium-potassium indicator solution, and titrate with C.1mol/L silver nitrate standard solution until brick red is the end point. At the same time, make a blank test. 6.5.2.4 Calculate
(V.-,)xcX0.D5844xVix100...
·The content of sodium oxide in the sample.%;
武: x
The volume of silver nitrate standard solution consumed in the determination of the test solution, nni.; The volume of silver nitrate standard solution consumed in the titration of the blank, called L: Concentration of nitric acid standard solution, mol/L:
0.05844-…The mass of silver oxide in grams equivalent to 1,G (mL silver nitrate standard titration solution Lc (AgN0),) = 1.000tncal/1.1,
V..-The volume of the sample Total volume, ml.
m—-mass of sample·5;
V,——volume of sample solution for determination, mL
The calculation result shall be kept to one decimal place.
6.5.2.5 Permissible difference of results
For parallel tests, the relative error shall not exceed 2%. 6.6 Dry tip weight
QB1500-:1992
6.6.1 Method --- According to GB8967 5.2.6. 6.6.2 Method 2
6.6.2.1 Principle
Under normal pressure, dry the sample in an electric oven at 03℃±2℃ for 2 hours, and determine the total amount of volatile substances lost by weighing method, expressed as autofrost.
6.6.2.2 Apparatus
Electrothermal drying oven
The diameter of the weighing bottle is 5:m;
The desiccant uses color-changing silica gel as desiccant
6.6.2.3 Analysis steps
Use a weighing bottle in a drying room to weigh about 5g of the sample, accurate to 0.0002g, and place it in a 103℃±2 specific heat drying oven for 2 hours, take it out, cover it, and put it in a desiccant to cool to room temperature (30min). Weigh it. 6.6.2.4 Calculate the weight loss of the sample, weight, m1-m×100mm. Before drying, weigh the weight of the sample in the weighing bottle, g. After drying, weigh the weight of the sample in the weighing bottle, g. - the weight of the weighing plate. The result should be rounded to one decimal place. 6.6.2.5 Allowable error of the result. For parallel tests, the relative error shall not exceed 2. 6.7 Iron. Determine according to 5.2.9 of GB 8967. 6.8 Sulfate. Determine according to 5.2.11 of GB 8967. 6.9 Shovel
Determine according to Article 5.2.10 of GB 8967. 6.10 Basis
Determine according to Article 5.2.7 of GB 8967. 6.11 Heavy metals
Determine according to Article 2.8 of GB896745.
7 Inspection rules
7.1 Batch
QB7500
All products with the same manufacturer name, product name, specification (including ingredients), trademark and batch number and the same quality certificate are regarded as batches.
7.2 Sampling
Samples are taken according to Table 3,
(box)
2 - 25
26--150
151～1200
1201---35000
Number of samples to be taken
Note: "Sample" refers to the basic packaging box of the product. Number of samples taken in a year
(bag, insert)
"Unit package" refers to the smallest packaging unit in the packaging box (unit, habitat, general): number of qualified judgments
The total number of unit packages taken individually should be added with the smallest unit package 7.3 Delivery inspection
Qualification criteria
7.3.1 The product is shipped out of the factory. The quality inspection department of the non-production factory is responsible for the batch inspection according to the provisions of this standard. The products that meet the standard requirements and sign the quality certificate will be shipped out.
7.3.2 Delivery inspection items include: appearance and sensory, packaging, net weight 5% sodium glutamate, 5% disodium lipoate (or flavoring nucleotides), light transmittance, sodium erythrinate, loss of drying and iron.
7. 3.3 Delivery inspection and determination rules
7.3. 3.1 Take unit packages according to Table 3 and inspect the packaging, net weight, appearance and sensory quality. If the number of unqualified samples is reached, the whole batch of products shall be judged as unqualified.
7.3. 3.2 Take unit packages according to Table 3 and seal half of the samples for future reference for half a year. The remaining samples shall be subjected to physical and chemical analysis. If any index does not meet the requirements of this standard, samples can be taken from twice the amount of packages for re-inspection, and the re-inspection results shall prevail. If there are still ·· unqualified items, the whole batch of products shall be judged as unqualified,
7.4 Type inspection
Generally, it is conducted once a quarter. When any of the following situations occurs, type inspection is also required. Changes in raw materials and ingredients;
Modification of key processes:
Type inspection is required when the national quality supervision agency proposes a type inspection request; In addition to the delivery inspection items, sulfates, nitrates, and heavy metals are also included. Note: When sulfuric acid is not used in production, sulfates can be omitted; when zinc is not used in the drum process, zinc can be omitted. 7.4.3 Rules for judging type inspection items
For delivery inspection items and sulfates, judgment shall be made in accordance with Article 7.3.3; If any of the zinc, nitrate, and heavy metal hygiene indicators is unqualified, the entire batch of products shall be judged as unqualified. 7.5 When the supplier and the buyer have a dispute over the quality of the product, the two parties may negotiate to select an arbitration unit to conduct arbitration analysis and judgment in accordance with the provisions of this standard:
8 Marking, packaging, transportation, storage
8.1 Marking
8.1.1 The packaging marking shall be marked in accordance with the provisions of GB7718: product name, manufacturer name, factory address, trademark, ingredients (main ingredients content OB 1500-1992
), production date, batch number, net weight and implementation code. Among them, 8.1.1.1 The product name shall be the full name, including the specifications, such as: 8% monosodium glutamate. If the content of monosodium glutamate is less than 80%, product names that may cause misunderstanding or confusion to consumers, such as "monosodium glutamate", "monosodium glutamate", "flavor powder", "fresh powder" or "flavor king", etc. 8.1.1.2 Ingredients containing monosodium glutamate should be labeled as: monosodium glutamate, salt; ingredients of special monosodium glutamate should be labeled as: glutamic acid, salt, sodium 5-isobutyric acid (or disodium 5-isobutyric acid), and the content should be indicated at the same time. For example: Monosodium glutamate
sodium glutamate
.8.5%
8.1. 3 The year, size and size of the production period should be marked. If the batch and production period are alternate, the batch number can be exempted. 8.1.2 The outer packaging box should be marked with: product name, product name, formula, trademark, production period or batch number, net weight, and should be marked with "waterproof, moisture-proof", "caution light policy", etc. 8.2 Packaging 8.2.1 Various packaging materials should be clean, dry, non-toxic, and odorless. The plastic film should meet the requirements of GB 445G. The inner packaging must be food plastic bags or glass, metal cans; the outer packaging must be corrugated paper boxes with inner plastic film or moisture-proof paper. 8.2.2 The net weight of the packaging should meet the requirements of Table 4. Packaging specifications will be psa 5kg. The net weight tolerance of the packaging is allowed. 8.2.3 The inner packaging should be sealed. Inspection method: lift the inner package, seal it, and shake it three times. If there is any condensation, the unit packaging is judged to be unqualified.
8.3 Transportation and transportation
8.3.1 Transportation tools must be clean and dry, meet food hygiene requirements, and have sun protection facilities. 8.3.2 Handle with care during storage and transportation, and do not smash or step on it. 8.3. During transportation, it must not be mixed, stored or transported with toxic, harmful, corrosive substances and other pollutants. 8.3.4 This product should be stored in a clean, dry and ventilated warehouse. Additional remarks:
This standard is issued by the Food Industry Department of the Ministry of Light Industry, and this standard is drafted by the National Food Development and Standardization Center. This standard is drafted by the Shanghai MSG Factory, the Food Fermentation Science Research Institute of the Ministry of Light Industry, Shanghai Tianchu Flavor, and the Shanghai MSG Factory.
The main drafters of this standard are Wei Guangfan, Dong Lian, Tian Qijing, Hu Minren and Yang Yongzi. From the date of implementation of this standard, the original light industry department will promote QR680-77 "Monosodium Glutamate" and QI681-77 "Monosodium Glutamate Test Method" as the standard
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