GB 5413.23-2010 English PDF

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GB 5413.23-2010: National food safety standard -- Determination of iodine in foods for infants and young children, milk and milk products
Status: Obsolete

GB 5413.23: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 5413.23-2010	239	Add to Cart	3 days	National food safety standard -- Determination of iodine in foods for infants and young children, milk and milk products	Obsolete
GB/T 5413.23-1997	199	Add to Cart	2 days	Milk powder and formula foods for infant and young children--Determination of iodine content	Obsolete

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Basic data

Standard ID: GB 5413.23-2010 (GB5413.23-2010)
Description (Translated English): National food safety standard -- Determination of iodine in foods for infants and young children, milk and milk products
Sector / Industry: National Standard
Classification of Chinese Standard: C53;X82
Classification of International Standard: 67.100.10
Word Count Estimation: 6,648
Date of Issue: 2010-03-26
Date of Implementation: 2010-06-01
Older Standard (superseded by this standard): GB/T 5413.23-1997
Regulation (derived from): Circular of the Ministry of Health (2010)7
Issuing agency(ies): Ministry of Health of the People's Republic of China
Summary: This Chinese standard specifies the infant foods and milk products Determination of iodine. This standard applies to infant foods and milk products Determination of iodine.

GB 5413.23-2010: National food safety standard -- Determination of iodine in foods for infants and young children, milk and milk products

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National food safety standard.Determination of iodine in foods for infants and young children, milk and milk products National Standards of People's Republic of China People's Republic of China Ministry of Health issued Issued on. 2010-03-26 2010-06-01 implementation National Food Safety Standard Determination of infant foods and dairy iodine National food safety standard Determination of iodine in foods for infants and young children, milk and milk products

Foreword

This standard replaces GB/T 5413.23-1997 "infant formula and milk powder Determination of Iodine" This standard compared with GB/T 5413.23-1997, main changes are as follows. - To fill the column quartz capillary column; - Increase the detection limit. Appendix A of this standard is an informative annex. This standard replaces the standards previously issued as follows. --GB 5413-1985, GB/T 5413.23-1997. National Food Safety Standard Determination of infant foods and dairy iodine

1 Scope

This standard specifies the method for determination of infant foods and dairy iodine. This standard applies to the determination of infant foods and dairy iodine.

2 Normative references

The standard file referenced in the application of this standard is essential. For dated references, only the edition date of the note Apply to this standard. For undated references, the latest edition (including any amendments) applies to this standard. Principle 3 Iodine in the sample under conditions of sulfuric acid and iodine derivatives generate butanone and butanone reacted by gas chromatography with electron capture detector inspection Testing, external standard.

4 Reagents and materials

Unless otherwise specified, the reagents used in this method are analytically pure water GB/T 6682 provided a water. 4.1 Peak's (Taka-Diastase) amylase. enzyme activity ≥1.5 U/mg. 4.2 potassium iodide (KI) or potassium iodate (KIO3). pure class distinctions. 4.3 butanone (C4H8O). chromatography. 4.4 sulfuric acid (H2SO4). pure class distinctions. 4.5 n-hexane (C6H14). 4.6 anhydrous sodium sulfate (Na2SO4). 4.7 Hydrogen peroxide (3.5%). lessons 11.7 mL volume fraction of 30% hydrogen peroxide diluted to 100 mL. 4.8 potassium ferrocyanide solution (109 g/L). Weigh 109 g of potassium ferrocyanide, water volume to 1000 mL volumetric flask. 4.9 zinc acetate solution (219 g/L). Weigh 219 g of zinc acetate, water volume to 1000 mL volumetric flask. 4.10 iodine standard solution. 4.10.1 iodine standard stock solution (1.0 mg/mL). Weigh 131 mg of potassium iodide (4.2) (accurate to 0.1 mg) or 168.5 mg potassium iodate (4.2) (accurate to 0.1 mg), dissolved in water and dilute to 100 mL, 5 ℃ ± 1 ℃ refrigerated within a week effective. 4.10.2 iodine standard working solution (1.0 μg/mL). draw 10 mL standard stock solution of iodine, water volume to 100 mL and mix, then draw 1.0 mL, 100 mL water to the mix, prepared before use. 5. Apparatus 5.1 Balance. a sense of the amount of 0.1 mg. 5.2 Gas chromatography with electron capture detector. Step 6 Analysis 6.1 Sample Processing 6.1.1 Starch-free sample Weigh mixed solid sample 5 g, liquid sample 20 g (accurate to 0.0001 g) in 150 mL Erlenmeyer flask, with a solid sample 25 mL of hot water about 40 ℃ dissolved. 6.1.2 sample containing starch Weigh mixed solid sample 5 g, liquid sample 20 g (accurate to 0.0001 g), in 150 mL flask was added 0.2 g Peak's amylase (4.1), solid sample with 25 mL of hot water about 40 ℃ fully dissolved, placed in 50 ℃ ~ 60 ℃ incubator hydrolysis 30 min, Remove to cool. 6.2 Preparation of sample measurement solution 6.2.1 precipitate. the processed sample solution transferred to 100 mL volumetric flask, add 5 mL potassium ferrocyanide solution (4.8) and 5 mL zinc acetate solution (4.9), the water volume to the mark still shaken after 10 min. After the filter paper to absorb the filtrate 10 mL 100 mL separating funnel, add 10 mL of water. 6.2.2 Derivatives and extraction. separating funnel was added to 0.7 mL of sulfuric acid (4.4), 0.5 mL butanone (4.3), 2.0 mL of hydrogen peroxide (4.7), Mix well, kept at room temperature for 20 min was added 20 mL of n-hexane (4.5) oscillation was extracted 2 min. After resting stratification, the aqueous phase shifted Another separatory funnel, and then a second extraction. The combined organic phase was washed with water two or three times. Dehydrated over anhydrous sodium sulfate and filtered shift Into 50mL volumetric flask with normal hexane, this is the sample measurement solution. 6.3 Preparation of standard iodine solution Determination Pipette 1.0 mL, 2.0 mL, 4.0 mL, 8.0 mL, 12.0 mL iodine standard working solution (4.10.2), equivalent to 1.0 μg, 2.0 μg, 4.0 μg, 8.0 μg, 12.0 μg of iodine, other analytical step with 6.2. 6.4 Determination 6.4.1 Reference chromatographic conditions Column. filler is 5% cyanopropyl - methyl silicone capillary column (column length 30 m, an inner diameter of 0.25 mm, film thickness 0.25 μm) Or equivalent performance of the column. Inlet temperature. 260 ℃. ECD detector temperature. 300 ℃. Split ratio. 1. 1. Injection volume. 1.0 μL. Temperature program shown in Table 1. Table 1 temperature program Heating rate (/ min ℃) Temperature (℃) Duration (min) 6.4.2 standard curve Determination of the iodine standard solution (6.3) were injected into a gas chromatograph (chromatogram see Appendix A) to give a peak area standard assay solution (Or peak height). In the standard assay solution peak area (or peak height) for the vertical axis, to the quality of (6.3) standard working solution of iodine in iodine as the horizontal Standard curve. 6.4.3 Determination of sample solution Determination of the sample solution (6.2) is injected into the gas chromatograph to obtain the peak area (or peak height), to obtain a sample from the standard curve of iodine-containing The amount (μg).

7 expression analysis

The iodine content of the sample according to equation (1). 100 × = CX s (1) Where. X-- sample iodine content in micrograms per hundred grams (μg/100 g); Cs-- iodine content in the sample obtained from the standard curve, in micrograms (μg); m-- sample mass, in grams (g). The arithmetic mean of two under the same condition of independent determination results indicated that the results of reservations to one decimal place.

8 Precision

Two independent determination results under the absolute difference in repetition condition must not exceed 10% of the arithmetic mean.

9 Other

The standard detection limit of 2.0 μg/100 g.

Appendix A

(Informative) Iodine standard derivative gas chromatogram A.1 iodine standard derivative gas chromatogram Iodine standard derivative gas chromatography is shown in Figure A.1. Figure A.1 iodine standard derivative gas chromatogram ......

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