GB/T 8967-2007 PDF in English
GB/T 8967-2007 (GB/T8967-2007, GBT 8967-2007, GBT8967-2007)
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| GB/T 8967-2007 | English | 130 |
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Monosodium L-glutamate
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| GB/T 8967-2000 | English | 639 |
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Monosodium L-glutamate (99% Wei jing)
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| GB/T 8967-1988 | English | RFQ |
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Monosodium L-glutamate
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Standards related to (historical): GB/T 8967-2007
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GB/T 8967-2007: PDF in English (GBT 8967-2007) GB/T 8967-2007
GB
ICS 67.220.10
X 66
National Standard
of the People’s Republic of China
Replacing GB/T 8967-2000
Monosodium L-glutamate
谷氨酸钠(味精)
ISSUED ON. FEBRUARY 2, 2007
IMPLEMENTED ON. DECEMBER 1, 2007
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Chemical name, molecular formula, structural formula, and relative
molecular mass ... 5
4 Terms and definitions ... 5
5 Classification ... 6
6 Requirements ... 6
7 Analysis methods ... 8
8 Test rules ... 21
9 Marking, packaging, transportation, and storage ... 23
Annex A ... 24
Annex B ... 30
Foreword
This Standard is not equivalent to “Monosodium L-glutamate” standard in the 7th
edition of Japanese “Specifications and Standards for Food Additives”. This Standard
incorporates relevant contents in QB 1500-1992 “MSG”, and it is a revision to GB/T
8967-2000 “Monosodium L-glutamate (99% MSG)”.
This Standard replaces GB/T 8967-2000, from the date of execution; QB 1500-1992
shall be invalidated accordingly.
Compared with GB/T 8967-2000, the main changes of this Standard are as follows.
— CHANGE the name to Monosodium L-glutamate (MSG);
— DEFINE the monosodium L-glutamate (MSG), salted MSG, and special
delicious MSG;
— CLASSIFY the monosodium L-glutamate (MSG);
— The hygienic requirements shall execute the relevant hygienic standards;
therefore, this Standard has no requirement;
— Methods for analysis of chloride. ADD the potassium chromate indicator method
(applicable to chromate added with edible salt);
— Visible turbidimetric methods for sulfate. there is difference at detail-level for
MSG, special delicious MSG, and salted MSG;
— ADD the determination of three flavor enhancers in special delicious MSG.
Annex A of this Standard is normative, and Annex B is informative.
This Standard shall be under the jurisdiction of the Subcommittee of Industrial
Fermentation of National Technical Committee on Food Industry of Standardization
Administration of China.
Drafting organizations of this Standard. China National Research Institute of Food &
Fermentation Industries, BBCA Biochemical Co., Ltd., Hangzhou West Lake MSG
Group Co., Ltd., Zhejiang Mifeng Group Co., Ltd., Shenyang Hongmei Enterprise
Group Co., Ltd., and Hebei Meihua Holding Group Co., Ltd.
Main drafters of this Standard. Zhang Wei, Chang Zhuxia, Cheng Changping, Gong
Xuming, Shi Zhongke, and Liu Senzhi.
The previous versions replaced by this Standard are as follows.
— GB 8967-1988, GB/T 8967-2000.
Monosodium L-glutamate
1 Scope
This Standard specifies monosodium L-glutamate’s (MSG) terms and definitions,
classification, requirements, analysis methods, test rules, marking, packaging,
transportation, and storage.
This Standard applies to monosodium L-glutamate (MSG).
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 191 Packaging - Pictorial marking for handling of goods (GB/T 191-2008, eqv
ISO 780. 1997)
GB/T 601 Chemical reagent - Preparations of standard volumetric solutions
GB/T 602-2002 Chemical reagent - Preparations of standard solutions for impurity
(ISO 6353-1. 1982, NEQ)
GB 2720 Hygienic standard for weijing (gourmet powder)
GB/T 5009.43 Method for analysis of hygienic standard of monosodium glutamate
GB/T 6682-1992 Water for laboratory use; Specifications
GB 7718 General standard for the labeling of prepackaged foods
JJF 1070 Rules of Metrological Testing for Net Quantity of Products in
Prepackages with Fixed Content
QB/T 3798 Food additive - Disodium 5’-inosinate+disodium 5’-guanylate
QB/T 3799 Food additive - Disodium guanylate
Measurement supervision and management methods for fixed quantity packaged
commodity (Order by General Administration of Quality Supervision, Inspection
7 Analysis methods
The water involved in this Standard, if not otherwise specified, refers to the water that
complies with GB/T 6682-1992.
The reagent involved in this Standard, if not otherwise specified for the specifications,
refers to analytical reagents (AR). Special requirements shall be expressly provided
otherwise.
The solution involved in this Standard refers to aqueous solution if there is no
indication of which solvent is used to prepare the solution.
7.1 Appearance
WEIGH about 10g of samples. OBSERVE them with the naked eye. SMELL and taste
them. And then make a judgment and keep a good record.
7.2 Identification test
CONDUCT according to Annex B.
7.3 Content of monosodium L-glutamate
7.3.1 Perchloric acid non-aqueous titration
7.3.1.1 Principle
With the existence of acetic acid, TITRATE the monosodium L-glutamate in the
sample with standard perchloric acid solution; determine its end point by
potentiometric titration or use α-naphtholbenzein as an indicator to titrate the solution
to green as its end point.
7.3.1.2 Instruments
7.3.1.2.1 Automatic potentiometric titrator (accuracy. ±5mV).
7.3.1.2.2 Acidometer.
7.3.1.2.3 Magnetic stirring apparatus.
7.3.1.3 Reagents and solutions
7.3.1.3.1 Standard titration solution of perchloric acid [c(HClO4)=0.1mol/L]. prepared
and standardized according to GB/T 601.
7.3.1.3.2 Acetic acid.
7.3.1.3.3 Formic acid.
specific rotation of the sample is calculated according to formula (4).
Where.
X3 - the specific rotation of the sample, in °;
tD - the specific rotation of the sample solution at t°C, in °;
t - the temperature of the measured sample solution, in °C;
0.047 - temperature correction factor.
The computing result shall be rounded off to the first decimal.
7.5.6 Tolerance
The difference in absolute value between the two test results of the same sample
shall not exceed 0.02%.
7.6 Chloride
7.6.1 Turbidimetry (applicable to traces of chloride)
7.6.1.1 Principle
Traces of chloride ions in the sample solution react with silver nitrate to produce
precipitated silver chloride, whose turbidity is compared with the silver chloride
produced from standard chloride ions. Visible turbidimetric method is conducted.
7.6.1.2 Reagents and solutions
7.6.1.2.1 Nitric acid
7.6.1.2.2 Chloride standard solution (1mL of solution contains 0.1mg of
chloride)
Prepared according to GB/T 602.
7.6.1.2.3 10% (volume fraction) salpeter solution
MEASURE 1-volume nitric acid (7.6.1.2.1) and put it into 9-volume water.
7.6.1.2.4 Silver nitrate standard solution [c(AgNO3)=0.1mol/L]
Prepared and standardized according to GB/T 601.
7.6.1.3 Analysis procedures
Phosphate standard buffer solution (pH 6.86). WEIGH 3.40g of monopotassium
phosphate (KH2PO4) and 3.55g of disodium hydrogen phosphate (Na2HPO4) that has
been pre-dried for 2h at 120°C. DISSOLVE them in water solution without carbon
dioxide; dilute to 1000mL; shake them well.
7.7.4 Analysis procedures
USE phosphate standard buffer solution. CALIBRATE pH meter to set the pH as 6.87
at 25°C. FIX the position. WASH the electrode with water.
WEIGH 5g of samples, accurate to 0.1g. DISSOLVE them in water solution without
carbon dioxide and dilute to 50mL. SHAKE the mixture well, which will serve as
sample solution. WASH the electrode with the sample solution before inserting it into
the sample solution. ADJUST the pH meter’s temperature compensation knob to 25°C;
measure the pH of the sample solution. REPEAT the operation until pH reading
remains steady for 1min. Finally record the results.
The measured result shall be accurate to the first decimal.
7.7.5 Tolerance
The difference in absolute value between the two tests of the same sample shall not
exceed 0.05pH.
7.8 Loss on drying
7.8.1 Principle
DETERMINE the mass of the lost volatile substance by drying method, expressed in
percentage.
7.8.2 The first method - Conventional method
7.8.2.1 Instruments
7.8.2.1.1 Electrically heated drying oven. temperature control of 98°C±1°C.
7.8.2.1.2 Weighing bottle. 50mm×30mm.
7.8.2.1.3 Desiccator. allochroic silica gel.
7.8.2.1.4 Analytical balance. sensibility of 0.1mg.
7.8.2.2 Analysis procedures
WEIGH 5g of samples with a weighing bottle that has been dried to a constant weight,
accurate to 0.0001g. PUT the bottle in the electrically heated drying oven at 98°C±1°C
f...
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Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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