GB/T 6433-2025 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 6433-2025 | English | 215 |
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Determination of crude fat in feeds
| Valid |
| GB/T 6433-2006 | English | 70 |
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Determination of crude fat in feeds
| Valid |
| GB/T 6433-1994 | English | 199 |
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Method for the determination of crude fat in feedstuffs
| Obsolete |
| GB 6433-1986 | English | 199 |
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Method for the determination of crude fat in feedstuffs
| Obsolete |
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GB/T 6433-2025: Determination of crude fat 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/GBT6433-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.120
CCS B 46
GB/T 6433-2025
Replacing GB/T 6433-2006
Determination of crude fat in feeds
(ISO 6492.1999, Animal feeding stuffs - Determination of fat content, MOD)
Issued on: JANUARY 24, 2025
Implemented on: AUGUST 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Soxhlet extraction method... 7
5 Filter bag method... 11
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
“Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents”.
This document replaces GB/T 6433-2006 “Determination of crude fat in feeds”.
Compared with GB/T 6433-2006, in addition to structural adjustments and editorial
changes, the main technical changes are as follows.
a) DELETE the sampling (see Clause 7 of the 2006 edition);
b) MODIFY the sample preparation requirements (see 4.4 of this document, Clause
r 8 of the 2006 edition);
c) ADD the pre-extraction requirements for extruded pellet feeds (see 4.1 and 4.5.1
of this document);
d) MODIFY the unit of determination results to percentage (see 4.6 of this document,
Clause 10 of the 2006 edition);
e) MODIFY the precision requirements (see 4.7 of this document, Clause 11 of the
2006 edition);
f) ADD the filter bag method (see Clause 5 of this document).
This document has modified and adopted ISO 6492.1999 “Animal feeding stuffs -
Determination of fat content”. Compared with ISO 6492.1999, this document has made
the following structural adjustments.
- 4.1 corresponds to Clause 4 of ISO 6492.1999;
- 4.2 corresponds to Clause 5 of ISO 6492.1999;
- 4.3 corresponds to Clause 6 of ISO 6492.1999;
- DELETE Clause 7 of ISO 6492.1999;
- 4.4 corresponds to Clause 8 of ISO 6492.1999;
- 4.5 corresponds to Chapter 9 of ISO 6492.1999;
- 4.6 corresponds to Clause 10 of ISO 6492.1999;
- 4.7 corresponds to Clause 11 of ISO 6492.1999;
- DELETE Clause 12, Annex A and bibliography of ISO 6492.1999;
- ADD Clause 5.
The technical differences between this document and ISO 6492.1999 and their reasons
are as follows.
- ADD the pre-extraction requirements for extruded pellet feeds (see 4.1 and 4.5.1
of this document), to meet the needs of crude fat testing of extruded pellet feeds in
China;
- REPLACE ISO 3696 with GB/T 6682 (see 4.2.1 of this document), to meet the
technical characteristics of China;
- DELETE the content of sampling;
- REPLACE ISO 6498 with GB/T 20195 (see 4.4 of this document), to meet the
technical characteristics of China;
- MODIFY the sample preparation requirements (see 4.4 of this document, Clause 7
of ISO 6492.1999), to meet the needs of crude fat testing in different forms of feed
raw materials and feed products in China;
- MODIFY the unit of determination results to percentage (see 4.6 of this document,
Clause 10 of ISO 6492.1999), to be consistent with the provisions of the national
standards for feed labeling in China;
- MODIFY the precision requirements (see 4.7 of this document, Clause 11 of
ISO6492.1999) to be applicable to the actual technical level of crude fat testing of
feeds in China;
- ADD the filter bag method (see Clause 5 of this document), to meet the
development trend of crude fat testing technology at home and abroad and meet
the actual testing needs of feed industry of China.
This document has made the following editorial changes.
- MODIFY the standard name to “Determination of crude fat in feeds”;
- CLARIFY the ISO 6492.1999 method as “Soxhlet extraction method”, to
distinguish the added filter bag method.
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority of this document shall not be held
responsible for identifying any or all such patent rights.
This document was proposed by and shall be under the jurisdiction of National
Technical Committee on Feed Industry of Standardization Administration of China
(SAC/TC 76).
Determination of crude fat in feeds
1 Scope
This document describes the Soxhlet extraction and filter bag methods for the
determination of crude fat in feeds.
This document applies to the determination of crude fat in compound feeds,
concentrated feeds, concentrate supplements, and feed ingredients (except algae and its
processed products).
To ensure the effectiveness of crude fat determination in this document, feeds are
divided into the following two categories, and Category B products need to be
hydrolyzed before extraction.
Category B.
- animal-derived feed ingredients, including dairy products;
- plant-derived feed ingredients from which fats cannot be extracted without prior
hydrolysis, such as gluten, yeast, soya and potato proteins, as well as heat-treated
feed ingredients and feed products;
- compound feeds, concentrated feeds, and concentrate supplements that use animal-
derived feed ingredients and/or plant-derived feed ingredients from which fats
cannot be extracted without prior hydrolysis, where at least 20 % of the crude fat
comes from these feed ingredients.
Category A.
- compound feeds, concentrated feeds, concentrate supplements, and feed
ingredients other than category B.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 6682 Water for analytical laboratory use - Specification and test methods
(GB/T 6682-2008, ISO 3696.1987, MOD)
GB/T 20195 Animal feed - Preparation of test samples (GB/T 20195-2024, ISO
6498.2012, MOD)
carbide chips (4.2.7) and weigh (m1) to the nearest 0.0001 g, accurately transfer 50 mL
of petroleum ether extract into this flask.
4.5.2.2 Distill off the solvent until it is nearly dry, add 2 mL of acetone (4.2.4) to the
flask, swirl the flask and slowly heat it on the heating device (4.3.4) to remove the
acetone. Dry the residue in the electric drying oven (4.3.5) at 103 ℃ ± 2 ℃ for 10 min,
take out, place in the desiccator (4.3.7) to cool, and weigh (m2) to the nearest 0.0001 g.
The following steps can also be taken. distill off the solvent, dry the residue in the flask
in the electric vacuum drying oven (4.3.6) at 80 ℃ for 90 min, take out, place in the
desiccator (4.3.7) to cool, and weigh (m2) to the nearest 0.0001 g.
4.5.2.3 Take out all the residue in the extraction thimble, evaporate in a fume hood to
remove the residual petroleum ether, and weigh the residue mass (m3) to the nearest
0.0001 g. Crush the residue so that it passes through a test sieve with a pore size of 1.0
mm, and process according to 4.5.3.
4.5.3 Sample weighing
Perform two tests in parallel. Weigh 5 g (m4) of sample (4.4 or 4.5.2.3) to the nearest
0.0001 g. For category B samples, process according to 4.5.4; for category A samples,
transfer to an extraction thimble (4.3.2), cover with absorbent cotton, and process
according to 4.5.5.
4.5.4 Hydrolysis
Transfer the sample to a 400 mL beaker or a 500 mL conical flask (or flask), add 100
mL of hydrochloric acid solution (4.2.5), 4 ~ 6 glass beads or some silicon carbide chips
(4.2.7), cover with a watch glass, or connect the conical flask (or flask) with a reflux
condenser, heat on a hot plate or heating jacket until the mixture is slightly boiling, keep
for 60 min, and swirl and shake every 10 min to prevent the sample from sticking to the
container wall.
Cool to room temperature, add a certain amount of diatomaceous earth (4.2.8) to
prevent loss of fat during the filtration, filter through a moistened fat-free double-layer
filter paper in a Buchner funnel with suction, and wash the residue with cold water until
it is neutral.
NOTE. If oil or fat appears on the surface of the filtrate, wrong results may be obtained. A possible
solution is to reduce the sample weight (4.5.3) or increase the acid concentration and re-hydrolyze.
Carefully remove the filter, place the double-layer filter paper containing the residue in
an extraction thimble (4.3.2), place in an electric vacuum drying oven (4.3.6), dry under
vacuum at 80 ℃ for 60 min, remove the extraction thimble, and cover the sample with
absorbent cotton.
4.5.5 Extraction
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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