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GB 2726-2016 (GB2726-2016)

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GB 2726-2016: PDF in English
GB 31604.29-2016
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard - Food Contact
Materials and Articles - Determination of Migration of
Methyl Methacrylate
食品接触材料及制品
ISSUED ON. OCTOBER 19, 2016
IMPLEMENTED ON. APRIL 19, 2017
Issued by. National Health and Family Planning Commission of the
People's Republic of China
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Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Principle... 4 
3 Reagents and materials ... 4 
4 Instruments and equipment ... 5 
5 Analysis steps ... 6 
6 Expression of analysis results ... 8 
7 Precision... 8 
8 Other ... 8 
Annex A Methyl methacrylate (MMA) standard gas chromatography-mass
spectrometry ion monitoring chart ... 9 
Annex B Sunflower seed oil specifications ... 10 
Foreword
This Standard replaces SN/T 2894-2011 Food contact materials for export.
Polymers. Determination of methyl methacrylate in food simulant
chromatography-mass spectrometry.
Compared with SN/T 2894-2011, the main changes in this Standard are as
follows.
- modified the standard’s name to “National Food Safety Standard - Food
Contact Materials and Articles - Determination of Migration of Methyl
Methacrylate”;
- modified the preparation of food simulate test solution;
- modified the expression of analysis results;
- modified the detection limit and quantitation limit.
National Food Safety Standard - Food Contact
Materials and Articles - Determination of Migration of
Methyl Methacrylate
1 Scope
This Standard specifies the determination of gas chromatography - mass
spectrometry of migration of methyl methacrylate in food contact materials
and articles.
This Standard is applicable to the determination of migration of methyl
methacrylate in food contact materials and articles.
2 Principle
Methyl methacrylate in water, acid, alcohol simulants are extracted with ethyl
acetate. After the sunflower oil mimetic is extracted by anhydrous ethanol, the
extract shall be detected by gas chromatography-mass spectrometry. Use
external standard method to quantify.
3 Reagents and materials
Unless otherwise stated, the reagents used in this method are of analytical
grade and water is of grade one specified in GB/T 6682.
3.1 Reagents
3.1.1 Sodium chloride (NaCl).
3.1.2 Anhydrous sodium sulfate (Na2SO4).
3.1.3 Ethyl acetate (C4H8O2). chromatographic pure.
3.1.4 Anhydrous ethanol (C2H5OH). chromatographic pure.
3.1.5 Water-based, acidic, alcohol food simulant. the reagents used are in
accordance with the provisions of GB 31604.1.
3.1.6 Sunflower seed oil. see Table B.1 in Annex B for specifications.
4.5 Volumetric flask. 50 mL, 100 mL, 1000 mL.
4.6 Organic filter. 0.45 μm.
4.7 Pipettes. 2 mL, 5 mL, 10 mL.
4.8 Plugged centrifuge tube. 10 mL.
4.9 Adjustable pipettes (1 μL ~ 20 μL, 20 μL ~ 100 μL, 100 μL ~ 5000 μL).
5 Analysis steps
5.1 Sample migration test
In accordance with the requirements of GB 5009.156 and GB 31604.1, the
sample shall be subjected to a migration test to obtain a food simulant test
solution. If the food simulant test solution cannot be immediately used for the
further test, the food simulant test solution shall be preserved at 0°C ~ 4°C
refrigerator in the dark.
It shall cool or recover the obtained food simulant test solution to room
temperature before the further test is carried out.
5.2 Preparation of test solution
5.2.1 Preparation of water-based, acidic, alcohol simulant test solutions
Pipet 2.0 mL of the water-based, acidic, alcohol simulants obtained from the
migration test in 10 mL plugged centrifuge tube. Respectively add 0.5 g of
sodium chloride and 2 mL of ethyl acetate into the centrifuge tube. After
vortex extraction (1500 r/min) for 1.5 min, put it aside for 2 min. Remove the
supernatant. Use anhydrous sodium sulfate to dry. Filter it through a 0.45 μm
filter for gas chromatography-mass spectrometry.
5.2.2 Preparation of sunflower seed oil simulant test solution
Pipet 2 g (to the nearest 0.1 mg) of sunflower seed oil food simulant obtained
from the migration test into the 10 mL plugged centrifuge tube. Add 2 mL of
ethyl acetate into the centrifuge tube. After vortex extraction (1500 r/min) for 1
min, put it aside for 2 min. Centrifuge in the high-speed centrifugation (4000
r/min) for 5 min. Immediately remove the supernatant. Filter it through a 0.45
μm filter for gas chromatography-mass spectrometry.
5.3 Preparation of blank test solution
Process the food simulant not contact with food contact material according to
the steps of 5.2.1 and 5.2.2.
The blank solution and food simulant test solution shall be sequentially
injected. The blank area is deducted so as to obtain the peak area of methyl
methacrylate.
6 Expression of analysis results
Obtain the concentration of methyl methacrylate in the sample solution from
the standard curve. Calculate the amount of migration according to GB
5009.156. Obtain the amount of methyl methacrylate in the food simulant and
products. The result is retained to two digits after the decimal point.
7 Precision
The absolute difference between the two independent determinations
obtained under repeatability shall not exceed 10% of the arithmetic mean.
8 Other
The detection limit of methyl methacrylate in water-based, acidic, and alcohol
simulants is 0.2 mg/L. The detection limit of methyl methacrylate in sunflower
seed oil simulant is 0.3 mg/kg.
The quantification limit of methyl methacrylate in water-based, acidic, and
alcohol simulants is 0.5 mg/L. The quantification limit of methyl methacrylate
in sunflower seed oil simulant is 0.7 mg/kg.
......
(Above excerpt was released on 2017-10-14, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GB2726-2016