GB/T 5523-2008 English PDF

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GB/T 5523-2008: Inspection of grains and oils -- Determination of lipase activity of grain and oilseeds
Status: Valid

GB/T 5523: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 5523-2008	139	Add to Cart	3 days	Inspection of grains and oils -- Determination of lipase activity of grain and oilseeds	Valid
GB/T 5523-1985	199	Add to Cart	2 days	Inspection of grain and oilseeds--Methods for determination of lipase activity	Obsolete

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Basic data

Standard ID: GB/T 5523-2008 (GB/T5523-2008)
Description (Translated English): Inspection of grains and oils -- Determination of lipase activity of grain and oilseeds
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: X04
Classification of International Standard: 67.040
Word Count Estimation: 6,674
Date of Issue: 2008-11-04
Date of Implementation: 2009-01-20
Older Standard (superseded by this standard): GB/T 5523-1985
Quoted Standard: GB/T 601; GB 5491; GB/T 5497; GB/T 6682
Regulation (derived from): National Standard Approval Announcement 2008 No.18 (Total No.131)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the grain, fuel lipase activity determination of terms and definitions, principle, reagents and materials, instruments and appliances, sample preparation, analysis step, calculated results and repeatability. This standard applies to food, determination of oil in the lipase activity.

GB/T 5523-2008: Inspection of grains and oils -- Determination of lipase activity of grain and oilseeds

---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.
Inspection of grains and oils. Determination of lipase activity of grain and oilseeds ICS 67.040 X04 National Standards of People's Republic of China Replacing GB/T 5523-1985 Inspection of grain Determination of grain and oilseeds of lipase activity Posted 2008-11-04 2009-01-20 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard replaces GB/T 5523-1985 "grain and oilseeds test lipase activity assay." The main changes compared to 5523-1985 standard and GB/T as follows. --- Modify the standard name; --- Increasing the terms and definitions; --- Modify the standard solution concentration, buffer pH and titration indicator, etc; --- Increase the reproducibility of test results requirements. The standard proposed by the National Food Authority. This standard by the National Standardization Technical Committee OILS. This standard was drafted. Anhui Grain and Oil Product Quality Supervision and Inspection Station, Guangdong Province, grain and oil inspection station, the national grain and oil quality inspection center, National Food Authority OILS Chengdu Quality Inspection Center. The main drafters of this standard. a quarter of cis, MINORITIES, Wang Yajun, Shang Yane, Ho Chao, Xieyue Kun, Shen Su Wen, Ma Yan. This standard replaces the standards previously issued as follows. --- GB/T 5523-1985. Inspection of grain Determination of grain and oilseeds of lipase activity

1 Scope

This standard specifies the grain and oilseeds in lipase activity determination of terms and definitions, principles, reagents and materials, apparatus and appliances, sample Preparation, analysis step, and reproducibility of the results of calculation. This standard applies to grain, oilseeds determination of Lipase activity.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. Preparation of GB/T 601 chemical reagent standard titration solution GB 5491 grain and oilseeds testing for sampling, and sample method GB/T 5497 grain and oilseeds - Determination of water test GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-2008, ISO 3696. 1987, MOD)

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 The amount of a certain amount of lipase in the sample and the role of pure oil free fatty acids generated by the sample and 1g (dry basis) generated Free fatty acids milligrams of potassium hydroxide consumed in Fig. Principle 4 Under conditions of pH7.4, lipase extracted from the sample, and to act on an amount of pure oil, pure oil in the lower part of lipase Decomposition divided into free fatty acids, and then titrated with potassium hydroxide solution.

5 Reagents and materials

The following reagents were analytical grade reagents. 5.1 Water. in line with GB/T 6682 laboratory water three requirements. 5.2 10g/L phenolphthalein indicator. Weigh 1.0g of phenolphthalein dissolved 100mL95% (volume fraction) ethanol. 5.3 1.0mol/L aqueous potassium hydroxide standard solution. According to GB/T 601 formulation and calibration. 5.4 0.05mol/L potassium hydroxide standard titration solution. accurate Pipette 50.0mL already calibrated standard stock solution of potassium hydroxide (5.3) In 1000mL volumetric flask, with 95% (volume fraction) ethanol diluted volume to 1000mL, stored in polyethylene plastic bottles. Before use Diluted formulation. 5.5 ethanol and anhydrous ether (4.1) mixture. 5.6 pH7.4 buffer. A solution. Weigh-hydrogen phosphate, disodium 11.876g, dissolved in 1L of water. ......

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