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SLOVENSKI STANDARD
01-junij-2022
Krma: metode vzorčenja in analize - Ugotavljanje gosipola v bombažnem semenu
in krmi z LC-MS/MS
Animal feeding stuffs: Methods of sampling and analysis - Determination of gossypol in
cotton seed and feeding stuff by LC-MS/MS
Futtermittel: Probenahme- und Untersuchungsverfahren - Bestimmung von Gossypol in
Baumwollsamen und Futtermitteln mittels LC-MS/MS
Aliments des animaux - Méthodes d’échantillonnage et d’analyse - Dosage du gossypol
dans les graines de coton et les aliments pour animaux par CL-SM/SM
Ta slovenski standard je istoveten z: EN 17504:2022
ICS:
65.120 Krmila Animal feeding stuffs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17504
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2022
EUROPÄISCHE NORM
ICS 65.120
English Version
Animal feeding stuffs: Methods of sampling and analysis -
Determination of gossypol in cotton seed and feeding stuff
by LC-MS/MS
Aliments des animaux - Méthodes d'échantillonnage et Futtermittel: Probenahme- und
d'analyse - Dosage du gossypol dans les graines de Untersuchungsverfahren - Bestimmung von Gossypol
coton et les aliments pour animaux par CL-SM/SM in Baumwollsamen und Futtermitteln mittels LC-
MS/MS
This European Standard was approved by CEN on 10 January 2022.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17504:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 5
5 Reagents . 5
6 Apparatus . 7
7 Procedure. 8
7.1 General . 8
7.2 Sample pre-treatment . 8
7.3 Test portion . 9
7.4 Extraction . 9
8 LC-MS/MS analysis . 10
8.1 General . 10
8.2 Analysis sequence . 11
9 Results . 11
9.1 Identification . 11
9.2 Quantification . 12
10 Precision . 14
10.1 General . 14
10.2 Repeatability . 14
10.3 Reproducibility . 14
11 Test report . 15
Annex A (informative) Precision data. 16
Annex B (informative) Example of LC-MS/MS conditions . 18
B.1 General . 18
B.2 HPLC conditions . 18
B.3 MS conditions . 19
Annex C (informative) Example chromatogram gossypol in compound feed . 20
Bibliography . 21
European foreword
This document (EN 17504:2022) has been prepared by Technical Committee CEN/TC 327 “Animal
feeding stuffs - Methods of sampling and analysis”, the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2022, and conflicting national standards shall
be withdrawn at the latest by September 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
Gossypol is a polyphenolic plant toxin produced by species of the genus Gossypium (cotton plant). The
plants are primarily grown for fibre and oil production. The seeds and processed seed materials are also
used as animal feeding stuffs. Gossypol is present in the seeds in two forms: free gossypol and bound
gossypol (mostly to proteins). The measured content of free gossypol depends on the method of
extraction and the specificity of the subsequent method of analysis used ([1], [2]). Consequently, this
method might not be directly comparable to existing standards based on spectrophotometric
measurement (e.g. [3], [4]).
WARNING — This protocol does not purport to address all the safety problems associated with its use.
It is the responsibility of the user of this protocol to establish appropriate safety and health protection
measures and to ensure that regulatory and legal requirements are complied with.
1 Scope
This document specifies a method for the determination of free gossypol, extractable by acidified
acetonitrile/water, in cottonseed, cottonseed products and compound feeds by liquid chromatography
with tandem mass spectrometry (LC-MS/MS).
The method described in this document has been successfully validated in the range of 69 mg/kg to
5 950 mg/kg by collaborative trial in the following matrices: cottonseed, cottonseed products
(cake/meal, hulls) and compound feeds for bovine, porcine and poultry.
NOTE It is possible to reach quantification limits of approximatively 5 mg/kg in compound feeds. The method
might be applicable at lower and at higher concentrations than the concentration range validated in the
collaborative trial. However, this needs to be assessed by in-house validation.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at
— IEC Electropedia: available at
4 Principle
Free gossypol is extracted by mixing an homogenized sample of 0,4 g of cottonseed or 1,0 g of cottonseed
product or compound feed with 40 ml of 0,1 % phosphoric acid in acetonitrile:water (80:20) (V:V). The
mixture is shaken for 1 h. After centrifugation a portion of the supernatant is diluted with extraction
solvent in a vial. The final extract is analysed by reversed phase liquid chromatography with tandem mass
spectrometry (LC-MS/MS). Quantification of gossypol in cottonseed and cottonseed products is based on
multi-level calibration using standards in extraction solvent. Quantification of gossypol in compound
feeds is based on multi-level calibration using standards in extraction solvent and corrected for the
apparent recovery.
5 Reagents
WARNING — Gossypol can be hazardous to health. It has a strong toxic effect on the reproductive organs.
Depending on the level of exposure, both acute and chronic effects are possible.
5.1 Gossypol, ≥ 95 %, as gossypol base
Gossypol is a racemic mixture of (+)- and (-)-gossypol. In this method the enantiomers of gossypol are
not separated. A standard containing a mixture of both enantiomers may be used.
Gossypol is also available in the form of a 1:1 complex with acetic acid. In this method either a standard
of gossypol or gossypol-acetic acid may be used.
NOTE Gossypol is sensitive to light.
5.2 Acetonitrile, LC-MS or HPLC quality
5.3 Phosphoric acid 85 % w/w, d = 1,71 g/cm , p.a. quality
5.4 Formic acid, ≥ 98 %, p.a. quality
5.5 Water
Water of LC-MS grade, double-distilled or water of grade 1 as defined in EN ISO 3696.
5.6 Extraction solvent: 0,1 % phosphoric acid in acetonitrile:water (80:20)
Mix 800 ml acetonitrile (5.2) and 200 ml water (5.5) in a bottle of 1 000 ml. Add 1,0 ml phosphoric acid
(5.3) and mix. This solution is stored at room temperature and may be used for 1 month.
5.7 Mobile phase A: 0,5 % formic acid in acetonitrile:water (5:95)
Mix 50 ml acetonitrile (5.2) and 950 ml water (5.5) in a bottle of 1 000 ml. Add 5 ml formic acid (5.4) and
mix. This solution is stored at room temperature and may be used for 1 month.
5.8 Mobile phase B: 0,5 % formic acid in acetonitrile:water (95:5)
Mix 950 ml acetonitrile (5.2) and 50 ml water (5.5) in a bottle of 1 000 ml. Add 5 ml formic acid (5.4) and
mix. This solution is stored at room temper
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