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GB/T 21514-2025: Determination of fatty acids in feeds
Status: Valid GB/T 21514: Evolution and historical versions
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| GB/T 21514-2025 | English | 409 |
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Determination of fatty acids in feeds
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GB/T 21514-2025
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| GB/T 21514-2008 | English | 274 |
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Determination of the content of fatty acids in feeds
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GB/T 21514-2008
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Basic data | Standard ID | GB/T 21514-2025 (GB/T21514-2025) | | Description (Translated English) | Determination of fatty acids in feeds | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B46 | | Classification of International Standard | 65.120 | | Word Count Estimation | 20,291 | | Date of Issue | 2025-06-30 | | Date of Implementation | 2026-01-01 | | Older Standard (superseded by this standard) | GB/T 21514-2008 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 21514-2025: Determination of fatty acids in feeds---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/GBT21514-2025
ICS 65.120
CCSB46
National Standard of the People's Republic of China
Replaces GB/T 21514-2008
Determination of fatty acids in feed
(ISO /T S17764-1.2002,Animalfeedingstuffs-Determinationofthe
ISO /T S17764-2.2002,Animalfeedingstuffs-Determinationofthe
Released on June 30, 2025
Implementation on January 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 21514-2008 "Determination of fatty acid content in feed". Compared with GB/T 21514-2008, except for the structure
In addition to adjustments and editorial changes, the main technical changes are as follows.
a) Change the scope of application to “compound feed, concentrated feed, concentrate supplement, pet feed and feed ingredients (algae and its processed products)
(Except for products)” (see Chapter 1, Chapter 1 of the.2008 edition);
b) Added hydrolysis extraction method (see 4.5.2.2);
c) The Soxhlet extraction method has been changed (see 4.5.2.3, 5.1 of the.2008 edition);
d) The saponification of fats and methyl esterification of fatty acids have been modified (see 4.5.3, 5.3.4 of the.2008 edition);
e) Deleted "Preparation of fatty acid methyl esters containing four or more carbon atoms (potassium hydroxide-hydrogen chloride method)" (see.2008
Version 5.4);
f) The determination steps have been changed (see 4.5.4, 6.3 of the.2008 edition);
g) The test data processing has been changed (see 4.6, Chapter 7 of the.2008 edition);
h) The precision requirements have been changed (see 4.7, Chapter 8 of the.2008 edition);
i) Added normalization method (see Chapter 5);
j) Added the detection limit and quantification limit of 37 fatty acids, basic information of 37 fatty acid methyl ester standards,
Conversion factors for esters, fatty acids and fatty acid triglycerides (see Appendices A, B and D).
This document is modified to adopt ISO /T S17764-1.2002 "Determination of fatty acid content in animal feeds - Part 1.Preparation of methyl esters",
ISO /T S17764-2.2002 "Determination of fatty acid content in animal feeds - Part 2.Gas chromatography method", document type is ISO 's technical
The technical specifications are adjusted to my country's national standards.
Compared with ISO /T S17764-1.2002 and ISO /T S17764-2.2002, this document has made the following structural adjustments.
--- Chapter 1 corresponds to Chapter 1 of ISO /T S17764-1.2002 and ISO /T S17764-2.2002;
--- Chapter 2 corresponds to Chapter 2 of ISO /T S17764-1.2002 and ISO /T S17764-2.2002;
--- Chapter 3 corresponds to Chapter 3 of ISO /T S17764-2.2002;
---4.1 corresponds to 5.1 of ISO /T S17764-1.2002 and Chapter 4 of ISO /T S17764-2.2002;
---4.2 corresponds to 5.2 of ISO /T S17764-1.2002 and Chapter 5 of ISO /T S17764-2.2002;
---4.3 corresponds to 5.3 of ISO /T S17764-1.2002 and Chapter 6 of ISO /T S17764-2.2002;
--- The added sample is 4.4;
--- Added sample weighing to 4.5.1;
---4.5.2 corresponds to Chapter 3 of ISO /T S17764-1.2002;
---4.5.3 corresponds to 5.4 of ISO /T S17764-1.2002;
--- Deleted Chapter 4, Chapter 6, Chapter 7 and Chapter 8 of ISO /T S17764-1.2002;
---4.5.4 corresponds to Chapter 7 and Chapter 8 of ISO /T S17764-2.2002;
---4.6 corresponds to Chapter 9 of ISO /T S17764-2.2002;
---4.7 corresponds to Chapter 10 of ISO /T S17764-2.2002;
--- Deleted Chapter 11, Appendix A and references of ISO /T S17764-2.2002;
---Added normalization method to Chapter 5.
The technical differences between this document and ISO /T S17764-1.2002 and ISO /T S17764-2.2002 and their reasons are as follows.
--- The term and definition of "exlutable content" (see 3.2 of ISO /T S17764-2.2002) have been deleted to comply with the requirements of my country's feed
Actual situation of fatty acid detection;
--- Added the hydrolysis extraction method for fat extraction (see 4.5.2.2), and changed the Soxhlet extraction method (see 4.5.2.3, ISO /T S17764-1.
2002, Chapter 3), to meet the needs of fatty acid detection in feed in my country;
--- Changed the saponification conditions of fats and methyl esterification of fatty acids (see 4.5.3, 5.4 of ISO /T S17764-1.2002) to meet our
The need for fatty acid testing in feed in China;
--- Deleted "Preparation of fatty acid methyl esters containing four or more carbon atoms (potassium hydroxide-hydrogen chloride method)", "storage", "testing
The three chapters of the "Report" (see Chapter 6, Chapter 7 and Chapter 8 of ISO /T S17764-1.2002) are in line with the requirements of the fatty acid test in feed in my country.
Measure the actual situation;
--- Modified the fatty acid determination steps (see 4.5.4, Chapter 7 and Chapter 8 of ISO /T S17764-2.2002) to comply with domestic and foreign standards.
The current status of gas chromatography technology development and the actual situation of fatty acid detection in feed in my country;
--- The test data processing (see 4.6, Chapter 9 of ISO /T S17764-2.2002) has been changed to meet the actual test requirements of my country's feed industry.
Measurement needs;
---Changed the precision requirements (see 4.7, Chapter 10 of ISO /T S17764-2.2002) to meet the actual testing requirements of my country's feed industry
Technical conditions;
--- Added the "normalization method" (see Chapter 5) to meet the needs of fatty acid detection in feed in my country.
The following editorial changes have been made to this document.
--- To coordinate with the existing standard, the name of the standard is changed to "Determination of Fatty Acids in Feed";
--- Deleted Notes 1 and 2 of Chapter 1 and Note 5.4.6 of ISO /T S17764-1.2002, as well as the Notes of ISO /T S17764-2.2002
Notes on 3.1, 5.4, 6.2, 6.3;
--- Deleted Appendix A and references of ISO /T S17764-2.2002.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document is proposed and coordinated by the National Feed Industry Standardization Technical Committee (SAC/TC76).
This document was drafted by. Sichuan Well Testing Technology Co., Ltd., Agricultural Quality Standards and Testing Technology Research Institute of the Chinese Academy of Agricultural Sciences
Institute, Tongwei Agricultural Development Co., Ltd.
The main drafters of this document are. Yang Fashu, Zhang Fengping, Fan Xia, Li Dexiang, Yin Liuyi, Wu Jinyu, Du Xueli, Wang Shi, Fan Li, Zhang Yanhong,
Lu Jiawen, Zhang Lu, Yang Juan, Sun Lihua, Wang Yong, Feng Yuchao, and Liu Xiaolu.
The previous versions of this document and the documents it replaces are as follows.
---First published in.2008 as GB/T 21514-2008;
---This is the first revision.
Determination of fatty acids in feed
1 Scope
This document describes a method for the gas chromatographic determination of fatty acids in feeds.
This document applies to compound feed, concentrated feed, concentrate supplement, pet feed and feed ingredients (except algae and its processed products)
Determination of fatty acids.
This document is not applicable to the determination of polymerized fatty acids.
The detection limits and quantification limits of fatty acids in this document shall be implemented in accordance with Appendix A.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 6433 Determination of crude fat in feeds (GB/T 6433-2025, ISO 6492.1999, MOD)
GB/T 6682 Specifications and test methods for water used in analytical laboratories (GB/T 6682-2008, ISO 3696.1987, MOD)
GB/T 20195 Preparation of Animal Feed Samples (GB/T 20195-2024, ISO 6498.2012, MOD)
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
fatty acid content
The mass fraction of fatty acids in samples such as oils, fats, fat extracts, free fatty acids or soaps.
3.2
The percentage of a certain fatty acid in the sample to the total amount of all fatty acids.
4 internal standard method
4.1 Principle
After the fat in the sample is extracted by Soxhlet extraction or hydrolysis (animal and vegetable oil samples are not extracted), it is saponified and methylated under alkaline conditions to produce
The fatty acid methyl esters were separated by gas chromatography and determined by flame ionization detector using internal standard method.
4.2 Reagents or materials
Warning. Boron trifluoride is a toxic substance. It is recommended that analysts do not directly use methanol and boron trifluoride to prepare boron trifluoride methanol solution.
The solution was purchased directly, and the saponification and methylation operations were completed in a fume hood.
Unless otherwise specified, only analytical grade reagents were used.
4.2.1 Water. GB/T 6682, Grade 3.
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