GB 5009.260-2016 PDF EnglishUS$70.00 · In stock · Download in 9 seconds
GB 5009.260-2016: Determination of sodium copper chlorophyllin in foods -- Spectrophotometric method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB 5009.260-2016: Determination of sodium copper chlorophyllin in foods -- Spectrophotometric method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB5009.260-2016 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National Food Safety Standard - Determination of sodium copper chlorophyll in foodstuffs Issued on: AUGUST 31, 2016 Implemented on: MARCH 01, 2017 Issued by. National Health and Family Planning Commission of PRC Table of ContentsForeword ... 3 1 Scope ... 4 2 Principle ... 4 3 Reagents and materials ... 4 4 Apparatus ... 5 5 Analysis steps ... 6 6 Expression of analysis results ... 7 7 Precision ... 7 8 Other ... 8ForewordThis Standard replaces GB/T 23749-2009 “Determination of sodium copper chlorophyllin in foods - Spectrophotometric method”. Compared with GB/T 23749-2009, the main deviations in this Standard are as follows. - changed the standard name as “National Food Safety Standard - Determination of sodium copper chlorophyll in foodstuffs”; - modified the measuring wavelength of GB/T 23749-2009; - modified the measuring steps of GB/T 23749-2009. National Food Safety Standard - Determination of sodium copper chlorophyll in foodstuffs1 ScopeThis Standard specifies the determination methods for sodium copper chlorophyll in fruit and vegetable juice (pulp) drinks, carbonated drinks, flavored drinks, blended wine, candies, canned food. This Standard is applicable to the determination of sodium copper chlorophyll in fruit and vegetable juice (pulp) drinks, carbonated drinks, flavored drinks, blended wine, candies, canned food.2 PrincipleSodium copper chlorophyll in the specimen, under acidic conditions, is absorbed by polyamide powder, is eluted by desorption solution, is determined by spectrophotometer, is quantified by the standard curve method.3 Reagents and materialsUnless otherwise stated, the reagents used in this method are of analytically pure; the water is grade three water specified in GB/T 6682. 3.1 Reagents and materials 3.1.1 Sodium hydroxide. 3.1.2 Ammonium acetate. 3.1.3 Methanol. 3.1.4 Glacial acetic acid. 3.1.5 Polyamide powder. particle size of 0.150mm ~ 0.180mm. 3.2 Reagent preparation 3.2.1 Sodium hydroxide solution (4 mol/L). weigh 16.0 g of sodium hydroxide, use water to dissolve and set volume to 100 mL. 3.2.2 Sodium hydroxide solution (0.1 mol/L). weigh 0.40 g of sodium hydroxide, use water to dissolve and set volume to 100 mL. 3.2.3 Ammonium acetate buffer solution (0.2 mol/L). weigh 7.708 g of ammonium acetate, use water to dissolve and set volume to 500 mL. 3.2.4 Desorption solution. 0.1 mol/L sodium hydroxide solution + methanol = 1+10 (volume ratio). 3.3 Standard product Sodium copper chlorophyll, content ≥99.0%. 3.4 Preparation of standard solution 3.4.1 Standard stock solution Accurately weigh 0.0500 g of sodium copper chlorophyll standard product that has been dried at 105°C ± 1°C to constant weight and is converted to 100% mass by its purity. Use water to dissolve and set volume to a 100mL brown volumetric flask. The concentration of this solution is 500 μg/mL. Prepare it at the same day when use it. Store it from light. 3.4.2 Standard working solution Accurately pipette 10 mL of 500 μg/mL standard solution to a 100mL beaker. Add 30 mL of 0.2 mol/L ammonium acetate solution. Use 4 mol/L sodium hydroxide solution and glacial acetic acid to adjust pH 5 ~ 6. Add into 3.0 g of polyamide powder. Completely stir 2min. Place it still from light 5min. Use about 20 mL of distilled water to transfer into G3 sand core funnel for suction-filtration. Discard the filtrate. Use 75 mL of desorption solution to desorb the pigment in 3 times. Pour about 25 mL of desorption solution each time. Soak 2min. Then shake 2min. Perform suction-filtration. Use 20 mL of desorption solution to wash the residual liquid clean in the filter bottle. Collect the filtrate. Use desorption solution to set volume to 100 mL. Prepare a standard solution with a concentration of 50 μg/mL. Prepare this solution when it is required.4 Apparatus4.1 Spectrophotometer. 4.2 Balance. resolution of 0.0001g. 4.3 G3 sand core funnel. 4.4 Suction-filtration device. vacuum pump, suction-filtration bottle. 4.5 Constant temperature drying oven. 4.6 Small sample mincer. 4.7 Porcelain mortar.5 Analysis steps5.1 Specimen preparation 5.1.1 Pretreatment of determination specimen of sodium copper chlorophyll 5.1.1.1 Pretreatment of beverage, alcohol samples Well shake the sample. Accurately weigh 5mL ~ 10mL (to the nearest of 0.1 mL) of sample to a 100mL beaker. Heat in 55°C ~ 60°C water bath for 3min ~ 5min. Remove alcohol. 5.1.1.2 Pretreatment of canned food sample Place a representative sample in the mincer to fully mash. Accurately weigh 1g ~ 10g of (to the nearest of 0.001g) well-mixed slurry to a 100mL beaker. 5.1.1.3 Pretreatment of candy sample Place the sample in the porcelain mortar to finely grinded and well mixed. Accurately weigh 1g ~ 10g of (to the nearest of 0.001g) sample into a 100mL beaker. 5.1.2 Post-treatment of testing sample solution Add 30mL of 0.2 mol/L ammonium acetate solution into a 100mL beaker that contains testing sample powder or sample slurry. Dissolve and well mix the sample solution. Use 4 mol/L sodium hydroxide solution and glacial acetic acid to adjust pH 5 ~ 6. Add into 3.0 g of polyamide powder. Completely stir 2min. Use about 20mL of 60°C ± 2°C distilled water to transfer the sample solution to G3 sand core funnel for suction-filtration. Discard the filtrate. Then use 75mL of desorption solution to desorb the pigment in 3 times. Perform suction-filtration. And use 20 mL of desorption solution to wash the residual liquid clean in the filter bottle. Collect the filtrate. Use desorption solution to set volume to 100 mL. 5.2 Apparatus conditions 5.2.1 Measuring wavelength. 405nm. 5.2.2 Cuvette. 1cm. 5.3 Production of standard curve Respectively take 0mL, 5.0mL, 10mL, 20mL, 30mL, 40mL, 50mL of standard working solutions into 100mL volumetric flasks. Use desorption solution to dilute to the scale. Prepare into standard series with concentrations of 0 μg/mL, 5 μg/mL, 10 μg/mL, 20 μg/mL, 30 μg/mL, 40 μg/mL, 50 μg/mL. Take 0 μg/mL solution as blank. Determine its absorbance value. Draw the standard curve of which the concentration is the abscissa and the absorbance is the ordinate. 5.4 Determination of specimen solution Take the sample preparation solution that has been pretreated. Take the 0 μg/mL of the standard curve as blank. Determine its absorbance value. Obtain the concentration of sodium copper chlorophyll in the sample solution based on the standard curve.6 Expression of analysis resultsThe content of sodium copper chlorophyll in the specimen is calculated according to formula (1). where, X - the content of sodium copper chlorophyll in the specimen, in grams per kilogram (g/kg) or grams per liter (g/L); c - the concentration of sodium copper chlorophyll obtained from the standard curve, in micrograms per milliliter (μg/mL); V - the set volume of the sample, in milliliters (mL); m - the sample amount weighed, in grams or milliliters (g or mL). The calculated results are expressed as the arithmetic mean of two independent determinations obtained under repetitive conditions. The result remains three digits after the decimal point.7 PrecisionThe absolute difference between two independent determinations obtained under repeatability conditions shall not exceed 10% of the arithmetic mean.8 OtherThe detection limit of this Standard is 0.001 g/kg. The limit of quantification is 0.005 g/kg. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB 5009.260-2016 be delivered?Answer: The full copy PDF of English version of GB 5009.260-2016 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB 5009.260-2016_English with my colleagues?Answer: Yes. 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