GB/T 21495-2008 English PDF

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GB/T 21495-2008: Animal and vegetable fats and oils -- Determination of polyunsaturated fatty acid with a cis, cis 1, 4-diene structure
Status: Obsolete

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21495-2008	354	Add to Cart	3 days	Animal and vegetable fats and oils -- Determination of polyunsaturated fatty acid with a cis, cis 1, 4-diene structure	Obsolete

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Basic data

Standard ID: GB/T 21495-2008 (GB/T21495-2008)
Description (Translated English): Animal and vegetable fats and oils -- Determination of polyunsaturated fatty acid with a cis, cis 1, 4-diene structure
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: X14
Classification of International Standard: 67.200.10
Word Count Estimation: 9,967
Date of Issue: 2008-03-06
Date of Implementation: 2008-08-01
Quoted Standard: GB/T 15687; ISO 5555
Adopted Standard: ISO 7847-1987, IDT
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 enzymatic determination of fats and oils in cis, cis 1, 4-diene structure of polyunsaturated fatty acids methods. Actually refers to linoleic acid with ��3 and ��6 polyunsaturated type structure (9, 12-octadecadienoic acid) and linolenic acid (9, 12, 15-octadecatrienoic) series. This standard does not apply to oils ��8 and ��9 type of polyunsaturated fatty acids and branched-chain fatty acids containing determination for.

GB/T 21495-2008: Animal and vegetable fats and oils -- Determination of polyunsaturated fatty acid with a cis, cis 1, 4-diene structure

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Animal and vegetable fats and oils. Determination of polyunsaturated fatty acid with a cis, cis 1, 4-diene structure ICS 67.200.10 X14 National Standards of People's Republic of China GB/T 21495-2008/ISO 7847. 1987 Animal and vegetable fats Having a cis, cis-1,4-diene structure Determination of polyunsaturated fatty acids (ISO 7847. 1987, IDT) Posted 2008-03-06 2008-08-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is identical with ISO 7847. 1987 test "animal fats have cis, cis-1,4-diene structure multi-unsaturated fatty acids Fixed "(in English). For ease of use, this standard made the following editorial changes. a) The "this International Standard" by "this standard"; b) use a decimal point instead of a decimal comma ",". ","; c) Remove the preface to international standards; d) the symbol "L" instead of "l" indicates "l"; e) with GB/T 15687 replaces ISO 661. Appendix A of this standard is a normative appendix. The standard proposed by the National Food Authority. This standard by the National Standardization Technical Committee OILS. This standard was drafted. State Administration of Grain Science Institute. The main drafters of this standard. Rui Zhang, Xue Yalin, Zu Liya. GB/T 21495-2008/ISO 7847. 1987 Animal and vegetable fats Having a cis, cis-1,4-diene structure Determination of polyunsaturated fatty acids

1 Scope

This standard specifies the enzymatic determination of animal fats cis, cis-1,4-diene structure polyunsaturated fatty acids approach actually refers to Linoleic acid (9,12-octadecadienoic acid) having ω3 type and ω6 polyunsaturated structures and linolenic acid (9,12,15-octadecadienoic acid) series. The structure is. C HH CH2 C This standard does not apply to oils ω8 and ω9 type of polyunsaturated fatty acids and determination of a branched fatty acid used.

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. GB/T 15687 grease sample preparation (GB/T 15687-1995, eqv ISO 661. 1989) ISO 5555 Animal and vegetable fats sampling

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 This standard specifies the method for the determination of the fatty acid content of the sample to represent. Principle 4 At room temperature, the samples after saponification of fatty acids produced with cis, cis-1,4-diene fatty acid structure is enzymatic oxidation, oxygen production Of acid absorbance was measured at the maximum absorption wavelength (about 235nm) at the same time make a blank test sample, the samples of polyunsaturated fatty acids content.

5 Reagents and materials

The reagents used were of analytical grade, distilled water or equivalent purity water. 5.1 n-hexane 5.2 hydrochloric acid solution Ba (HCl) ≈0.5mol/L. 5.3 KOH - ethanol solution [Ba (KOH) ≈0.5mol/L] 5.3.1 stock solution Weigh 65g of potassium hydroxide (86% KOH) is dissolved in about 80mL of water, cooled and diluted to 100mL. GB/T 21495-2008/ISO 7847. 1987 ......

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