GB 1886.360-2022National food safety standard - Food additive - Tea polyphenols (English PDF)
食品安全国家标准 食品添加剂 茶多酚棕榈酸酯
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Issued by
NHC; SAMR
Level / Type
National · Mandatory
Issue date
June 30, 2022
Implementation date
December 30, 2022
Scope
GB 1886.360-2022 is the English-translated version of 食品安全国家标准 食品添加剂 茶多酚棕榈酸酯.
GB 1886.360-2022 is the Chinese national food safety standard for the food additive tea polyphenol palmitate. It applies to the additive made from tea polyphenol extracted from green tea, by esterification with palmitoyl chloride followed by filtration, water washing, desolvation, crystallisation, centrifugation and freeze drying.
It sets the technical requirements of the product, with the sensory requirements and the physical and chemical indicators.
Annex A carries the inspection methods, among them the identification test that separates the sample with a mixed solvent and develops the colour with vanillin solution, so that tea polyphenol palmitate, tea polyphenols or a mixture of the two can be told apart, and the determination of the tea polyphenol palmitate content against an ethyl gallate standard. It was issued on 30 June 2022 and has applied since 30 December 2022.
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Document preview — GB 1886.360-2022
National Standard of the People's Republic of China
Issued by: NHC; SAMR
Contents
- 1 Scope3
- 2 Technical requirements3
- Annex A Inspection methods4
1 Scope
This document is applicable to tea polyphenol palmitate, a food additive, that tea polyphenol is extracted from green tea as raw materials, that is made by palmitoyl chloride esterification, filtration, water-washing, desolvation, crystallization, centrifugation, freeze-drying and other processes.
2 Technical requirements
2.1 Sensory requirements
Sensory requirements shall meet the requirements of Table 1.
2.2 Physical and chemical indicators
Physical and chemical indicators shall meet the requirements of Table 2.
Annex A Inspection methods
A.3.3 Identification test with water-soluble tea polyphenols
Weigh 20mg~30mg of tea polyphenol sample into a 10mL centrifuge tube 1. Then add 5mL of mixed solvent A. Shake to make it dissolved. Centrifuge at 4000r/min for 5min.
Transfer the centrifuged supernatant to another 10mL centrifuge tube 2. Pipette 5mL of mixed solvent A into centrifuge tube 1. Centrifuge at 4000r/min for 5min. Transfer the centrifuged supernatant to centrifuge tube 2. Combine the supernatants. Dissolve the centrifuged precipitate in 10mL of absolute ethanol and record it as the precipitate.
Pipette 1mL of supernatant and 1mL of precipitate into 10mL test tubes, respectively.
Add 4mL of vanillin chromogenic solution to each tube. Mix well. Wait for 5min for color development.
Observe the color development results. If the supernatant is red, it means that the sample contains tea polyphenol palmitate. If the precipitate is red, it means that the sample contains tea polyphenols. If both are red, the sample is a mixture of tea polyphenol palmitate and tea polyphenols. If both are not colored, it means that the sample contains neither tea polyphenols nor tea polyphenol palmitate.
A.4 Determination of tea polyphenol palmitate content
A.4.1 Reagents and materials
A.4.1.1 Tea polyphenol palmitate. Use after drying to constant weight under vacuum at 45°C.
A.4.1.2 Vitamin C. Use after vacuum drying at 45°C to constant weight.
A.4.1.3 Ethyl gallate. Purity is 99.0%. Use after drying to constant weight under vacuum at 45°C.
A.4.1.4 Vitamin C solution. 0.075mol/L. Accurately weigh 1.32g of vitamin C. Use water to dissolve and set volume to 100mL.
A.4.1.5 Triethanolamine solution. Weigh 50.0mL of triethanolamine. Add 25mL of water to dilute. Transfer to a 100mL volumetric flask. Use water to dilute to the scale.
A.4.1.6 Standard stock solution of ethyl gallate. Accurately weigh 0.10g of ethyl gallate. Use water to dissolve and set volume to 100mL.
A.4.1.7 Tea polyphenol palmitate ethanol solution. Accurately weigh about 500mg of tea polyphenol palmitate (to the nearest of 0.1mg). Record it as the dry weight of tea polyphenol palmitate, m. Use anhydrous ethanol to dissolve and set volume to 100mL.
A.4.1.8 Ferrous tartrate solution. Accurately weigh 1.60g of Ferrous sulfate (FeSO4 · 7H2O) and 8.04g of potassium sodium tartrate. Respectively use water to dissolve. Transfer to a 1000mL volumetric flask. Dilute to the scale.
A.4.2 Analysis steps
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 21 pages — is available in the English PDF.
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