GB 5009.43-2023_English: PDF (GB5009.43-2023)
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(National Food Safety Standard Determination of Monodium Glutamate in MSG)
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GB 5009.43-2023
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Standards related to: GB 5009.43-2023
| Standard ID | GB 5009.43-2023 (GB5009.43-2023) | | Description (Translated English) | (National Food Safety Standards Good Manufacturing Practice for Infant Formulas) | | Sector / Industry | National Standard | | Classification of Chinese Standard | X09 | | Word Count Estimation | 13,161 | | Date of Issue | 2023-09-06 | | Date of Implementation | 2024-09-06 | | Issuing agency(ies) | National Health Commission of the People's Republic of China, State Administration for Market Regulation | | Summary | This standard specifies the basic requirements and management guidelines for sites, facilities, and personnel in the production process of infant formula foods such as raw material procurement, processing, packaging, storage, and transportation. This standard applies to the production of infant formula foods with milk and/or soybeans and their processed products as the main protein source. | GB 5009.43-2023. National food safety standard Determination of sodium glutamate in monosodium glutamate
National Standards of People's Republic of China
National food safety standards
Determination of sodium glutamate in MSG
Published on 2023-09-06
Implemented on 2024-03-06
National Health Commission of the People's Republic of China
Released by the State Administration for Market Regulation
Preface
This standard replaces GB 5009.43-2016 "National Food Safety Standard Determination of Sodium Glutamate (Sodium Glutamate) in Monosodium Glutamate".
Compared with GB 5009.43-2016, the main changes in this standard are as follows.
---Modified the titration end point of the first chemical indicator method;
---Deleted the third method acidometer method.
National food safety standards
Determination of sodium glutamate in MSG
1 Scope
This standard specifies the determination method of sodium glutamate in MSG.
This standard is applicable to the determination of sodium glutamate in MSG.
Method 1.Titration of non-aqueous solutions of perchloric acid
2 Principles
The alkalinity of sodium glutamate is significantly enhanced in acetic acid solution. Use perchloric acid standard solution to titrate sodium glutamate in the sample and use potentiometric titration.
When measured by the method, the titration end point is determined based on the potential jump; when measured by the chemical indicator method, α-naphthol phenylmethanol is used as the indicator.
Titrate the sample solution to light green as the end point, and calculate the content of sodium glutamate in MSG by consuming the perchloric acid standard titration solution.
3 Reagents and materials
Unless otherwise stated, the reagents used in this method are of analytical grade and the water is secondary water specified in GB/T 6682.
3.1 Reagents
3.1.1 Formic acid (CH2O2) ≥99%.
3.1.2 Acetic acid (C2H4O2) ≥99%.
3.1.3 Perchloric acid (HClO4).
3.1.4 α-Naphthol phenylmethanol (C27H18O2).
3.2 Reagent preparation
α-Naphtholphenylmethanol-acetic acid indicator solution (2g/L). Weigh 0.1g α-naphtholphenylmethanol, dissolve it with acetic acid and dilute to 50mL, avoid
Stored alone, the validity period is 60 days.
3.3 Standard solution
Perchloric acid standard titration solution [c(HClO4)=0.1mol/L]. Prepare and calibrate according to GB/T 601 or purchase standard titration with certificate
solution.
4 Instruments and equipment
4.1 Potentiometric titrator (accuracy ≤0.2mV), equipped with dynamic titration mode or isovolume titration mode.
4.2 Non-aqueous pH electrode uses Ag/AgCl as the internal reference electrode; the internal reference electrolyte is 2mol/L lithium chloride ethanol solution or
0.4mol/L tetraethylammonium bromide ethylene glycol solution.
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