EN 15782:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.ORþOMLYRVWLFuttermittel - Bestimmung von Nicarbazin - Hochleistungsflüssigchromatographisches VerfahrenAliments des animaux - Détermination de la nicarbazine - Méthode de chromatographie liquide hautes performancesAnimal feeding stuffs - Determination of nicarbazin - High-performance liquid chromatographic method65.120KrmilaAnimal feeding stuffsICS:Ta slovenski standard je istoveten z:EN 15782:2009SIST EN 15782:2009en,fr,de01-december-2009SIST EN 15782:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15782August 2009ICS 65.120 English VersionAnimal feeding stuffs - Determination of nicarbazin - High-performance liquid chromatographic methodAliments des animaux - Détermination de la nicarbazine -Méthode de chromatographie liquide hautes performancesFuttermittel - Bestimmung von Nicarbazin -Hochleistungsflüssigchromatographisches VerfahrenThis European Standard was approved by CEN on 3 July 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15782:2009: ESIST EN 15782:2009

Results of an interlaboratory study .9 Bibliography . 10
1 Scope This European Standard specifies a method for the determination of additive use of nicarbazin in animal feeding stuffs and premixtures (maximum concentration 2,5% nicarbazin) using high performance liquid chromatography. Nicarbazin is a 1:1 equimolar mixture of 4,4’-dinitrocarbanilide (DNC) and 4,6-dimethyl-2-pyriminol (HDP). Nicarbazin is generally determined by using DNC as the target compound. In this method the DNC moiety of nicarbazin is detected. The limit of quantitation is 20 mg/kg. The limit of detection is 0,5 mg/kg NOTE A lower limit of quantitation may be achievable but should be validated by the user. 2 Principle Samples are extracted using an acetonitrile/methanol mixture. For feeding stuffs, water is added additionally. An aliquot of the extract is assayed using a reverse phase isocratic HPLC method which measures the 4,4’dinitrocarbanilide moiety at a wavelength of 350 nm. 3 Reagents Use only reagents of recognized analytical grade, unless otherwise specified.
3.1 Water, resistance > 10 MOhm.cm-1. 3.2 Acetonitrile (CH3CN), HPLC grade. 3.3 Methanol (CH3OH), HPLC grade. 3.4 Extraction solvent
Mix 500 ml of acetonitrile (3.2) with 500 ml of methanol (3.3). Mix well using a magnetic stir plate and stir bar. 3.5 Eluent for liquid chromatography
Mix 650 ml acetonitrile (3.2) with 350 ml of purified water (3.1). Mix well using a magnetic stir plate and stir bar and degas (e.g. with helium) before use. 3.6 Nicarbazin reference standard 3.7 Standard solutions 3.7.1 Nicarbazin stock standard solution, 100 µµµµg/ml Dissolve 10 mg, weighed to the nearest 0,1 mg, of nicarbazin reference standard (3.6) in 100 ml extraction solvent (3.4). To aid with dissolution, sonication for approximately 5 min is recommended. Mix well. This solution is stable for 24 h when stored in subdued light at ambient or refrigerated storage conditions (see remark 3.7.1). NOTE 1 The solubility of the nicarbazin reference standard in extraction solvent is critical. The nicarbazin concentrations in the prepared stock solutions must be monitored by use of a cuvet spectrophotometer as follows. Prepare a solution of 10 µg/ml by diluting the prepared stock standard solution (3.7.1) with acetonitrile. Record a UV-Vis spectrum between 220 nm and 450 nm using a mixture of methanol/acetonitrile (5:95 v/v) as a reference solution. The maximum SIST EN 15782:2009

Prepare a range of calibration working standards containing 0 µg/ml; 0,25 µg/ml; 0,5 µg/ml; 1 µg/ml; 2 µg/ml; 5 µg/ml and 10 µg/ml nicarbazin by diluting the stock standard solution (3.7.1) with HPLC eluent (3.5). Working standards must be prepared daily. 4 Apparatus Usual laboratory apparatus and, in particular, the following. 4.1 High performance liquid chromatography system consisting of the following: 4.1.1 An autosampler or manual injector set to inject a volume of 20 µl. 4.1.2 A pump set to deliver a constant eluent flow rate of 1,0 ml/min. 4.1.3 HPLC column, 250 mm x 4,6 mm packed with RP C18, 5 µm material, or equivalent.
NOTE A Nova-Pak or Bonda-Pak column is recommended, but also other columns can be used provided that a satisfactory separation of DNC is achieved. 4.1.4 A detector allowing the measurement of absorbance of UV light at a wavelength of 350 nm. 4.2 Mechanical shaker (e.g. Gyratory shaker, wrist action shaker or
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