GB 5009.149-2016 PDF English
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| GB 5009.149-2016 | English | 110 |
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Determination of crocin in foods
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| GB/T 5009.149-2003 | English | 279 |
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Determination of crocin in foods
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GB 5009.149-2016: PDF in English GB 5009.149-2016
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard -
Determination of Gardenia Yellow in Foods
ISSUED ON: DECEMBER 23, 2016
IMPLEMENTED ON: JUNE 23, 2017
Issued by: National Health and Family Planning Commission of the PRC;
State Food and Drug Administration.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Principle ... 4
3 Reagents and materials ... 4
4 Instruments and apparatuses ... 5
5 Analysis steps ... 5
6 Description of the analysis result ... 7
7 Precision ... 8
8 Others ... 8
Appendix A Standard chromatogram of crocin and crocetin ... 9
National Food Safety Standard -
Determination of Gardenia Yellow in Foods
1 Scope
This Standard specifies the determination method of crocin and crocetin, the
representative components of gardenia yellow in food.
This Standard applies to the determination of crocin and crocetin in ice cream, candied
fruit, pickle, dried almond, chocolate, pastries, cooked meat, soy sauce, fruit juice,
mixed wine, jelly and potato chip.
2 Principle
The sample which is ultrasonically extracted by methanol, shall be separated by C18
reversed-phase chromatography / visible light detector to determine crocin and
crocetin, major color-developing components of gardenia yellow, at 440 nm. It is
characterized by retention time and quantified by external standard method.
3 Reagents and materials
Unless otherwise specified, all the reagents in this method are analytical reagents, the
water is grade-1 water which is specified by GB/T 6682.
3.1 Reagents
3.1.1 Methanol (CH3OH): chromatographic pure.
3.1.2 Acetonitrile (CH3CH): chromatographic pure.
3.1.3 Glacial acetic acid (CH3COOH).
3.1.4 Ammonium acetate (CH3COONH4).
3.2 Preparation of reagents
3.2.1 Acetic acid-ammonium acetate solution (pH=4): accurately weigh 0.77 g of
ammonium acetate in a 1 L volumetric flask; add 900 mL of water to dissolve; use
glacial acetic acid to adjust pH=4.0; add water to fix volume to 1 L; mix well. Use it
after it is filtered through a 0.45 μm microporous membrane.
5.1.1 Liquid sample
Shake well and pack the samples such as beverage, alcohol and soy sauce; seal and
store at room temperature or in a refrigerator.
5.1.2 Semi-solid sample
For samples such as jelly, take the edible portion to homogenate; stir evenly; package;
seal; refrigerate or freeze to store.
5.1.3 Solid sample
For samples of low-water content, such as biscuit, cake, cooked meat products and
cocoa products, use the high-speed pulverizer to pulverize; package; seal and store
at room temperature out of the sun.
5.2 Sample processing
5.2.1 Liquid sample
Weigh 2 g (accurate to 0.01 g) of uniform sample (carbon dioxide in the sample, if any,
shall be removed by ultrasound firstly) in a beaker; use an appropriate amount of
methanol to dissolve it; transfer it to a 25 mL volumetric flask; add methanol to fix
volume; shake well. Pipette 1 mL of the solution; filter it through a 0.45 μm organic
filter for testing.
5.2.2 Semi-solid and solid samples
Weigh 2 g (accurate to 0.01 g) of uniform sample in a 50 mL centrifuge tube; accurately
measure 25 mL of methanol solution into it; use ultrasound for 20 min and vortex for 2
min; centrifuge at 4 000 r/min for 10 min; absorb 1 mL of supernatant to filter through
a 0.45 μm organic filter membrane, which is for later test.
5.2.3 Soy sauce
Weigh 1 g (accurate to 0.01 g) of uniform sample in a beaker; use an appropriate
amount of methanol to dissolve it; transfer it to a 50 mL volumetric flask; add methanol
to fix volume; shake well. Pipette 1 mL of the solution; filter it through a 0.45 μm organic
filter for testing.
Note: 5.2 shall be performed in an environment without strong light exposure.
5.3 Apparatus reference conditions
Apparatus reference conditions are listed as below:
a) Chromatographic column: C18 column with a column length of 250 mm, an inner
diameter of 4.6 mm, a particle size of 5 μm, or columns of equivalent performance;
X -- the content of crocin or crocetin in the sample, in grams per kilogram (g/kg);
ρ -- the concentration of crocin or crocetin in the sample solution that is obtained from
the standard curve, in micrograms per milliliter (μg/mL);
V -- the volumetric volume of the sample solution, in milliliters (mL);
1 000 -- conversion coefficient;
m -- the sample mass of the final sample, in grams (g);
F -- the purity conversion factor of the standard.
The calculation result shall keep two significant figures.
7 Precision
The absolute difference of two independent test results under repeatability cannot
exceed 15% of the arithmetic mean value.
8 Others
Method detection-limit (LOD): for soy sauce sample, when the sampling amount is 1.0
g, the crocin is 50 mg/kg, and the crocetin is 10.0 mg/kg; for other samples, when the
sampling amount is 2.0 g, the crocin is 12.5 mg/kg, the crocetin is 2.5 mg/kg.
Method quantitation-limit (LOQ): for soy sauce sample, when the sampling amount is
1.0 g, the crocin is 250 mg/kg, and the crocetin is 50.0 mg/kg; for other samples, when
the sampling amount is 2.0 g, the crocin is 62.5 mg/kg, the crocetin is 12.5 mg/kg.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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