GB 1886.303-2021 English PDF (GB1886.303-2021)

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GB 1886.303-2021: National food safety standard - Food additives - Edible tannin
GB 1886.303-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard Food additives - Edible
tannin
ISSUED ON: FEBRUARY 22, 2021
IMPLEMENTED ON: AUGUST 22, 2021
Issued by: National Health Commission of the People's Republic of
China;
State Administration for Market Regulation.
Table of Contents
1 Scope ... 3 
2 Technical requirements ... 3 
Appendix A Inspection method ... 4 
Appendix B Reference gas chromatogram ... 10 
National food safety standard Food additives - Edible
tannin
1 Scope
This Standard applies to the food additive edible tannin, whose main
component is tannin, that is obtained through extraction and processing of
ethanol or ethyl acetate, with Galla chinensis as raw material.
2 Technical requirements
2.1 Sensory requirements
Sensory requirements shall be in accordance with Table 1.
Table 1 – Sensory requirements
2.2 Physical and chemical indicators
Physical and chemical indicators shall be in accordance with Table 2.
Table 2 – Physical and chemical indicators
A.3.3 Analysis steps
Weigh about 2 g of sample (dry basis, accurate to 0.000 1 g); add a small
amount of water to dissolve; use aqueous ammonia solution to adjust the pH to
5.0 ± 0.1; then, use water to dilute to 500 mL. Absorb 100 mL of the above
solution; transfer it into a 250 mL brown wild-mouth bottle with a stopper; add 8
g of polyamide-6; shake at 20 °C ~ 25 °C for 40 min. After standing for 10
minutes, use double-layer filter paper to filter. The filtrate shall be clear. Absorb
50 mL of the filtrate and place it on an evaporating dish that has been dried at
105 °C ± 2 °C for 2 h; evaporate to dryness in a steam bath; then, dry at 105 °C
± 2 °C for 2 h. Cool in a desiccator for 30 minutes and weigh. Do a blank test
at the same time.
A.3.4 Result calculation
Calculate the mass fraction w1 of tannin content (calculated on a dry basis)
according to Formula (A.1).
Where:
m – mass of the sample (dry basis), in grams (g).
m1 – mass of the dried product that is finally obtained from the sample analysis,
in grams (g);
m0 – mass of the dried product that is finally obtained from the blank analysis,
in grams (g);
10 – volume conversion factor.
The test result is based on the arithmetic mean of the parallel determination
results. The absolute difference between two independent determination results
which are obtained under repeatability conditions shall not be greater than 0.5%
of the arithmetic mean.
A.4 Determination of ignition residue
A.4.1 Reagents and materials
Sulfuric acid
A.4.2 Instruments and apparatuses
A.4.2.1 Crucible.
A.7.1 Reagents and materials
A.7.1.1 Grade-1 water that is specified in GB/T 6682.
A.7.1.2 Standard ethyl acetate: chromatographic pure.
A.7.1.3 n-butanol: used as an internal standard substance, chromatographic
pure.
A.7.2 Instruments and apparatuses
Gas chromatograph: equipped with hydrogen flame ionization detector (FID)
and headspace sampler.
A.7.3 Reference chromatographic conditions
A.7.3.1 Chromatographic column: capillary column (ϕ 0.32 mm × 30 m); the
stationary phase is 14% cyanopropyl phenyl-86% polydimethylsiloxane; the
thickness is 0.25 μm; or other equivalent chromatographic columns.
A.7.3.2 Carrier gas: nitrogen.
A.7.3.3 Carrier gas flow velocity: 1 mL/min.
A.7.3.4 Makeup gas flow velocity: 40 mL/min.
A.7.3.5 Column temperature: keep at 80 °C for 10 min; raise the temperature
to 250 °C at 80 °C/min; keep it for 2 min.
A.7.3.6 Temperature of the sample injector: 150 °C.
A.7.3.7 Temperature of the detector: 250 °C.
A.7.3.8 Injection volume: 1.0 mL.
A.7.4 Reference headspace sampling conditions
A.7.4.1 Headspace bottle: 25 mL.
A.7.4.2 Equilibrium temperature: 60 °C.
A.7.4.3 Equilibrium time: 30 min.
A.7.4.4 Sampling time: 0.5 min.
A.7.5 Analysis steps
A.7.5.1 Preparation of internal standard solution