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Thalmann A, Wagner K, Tomassen M, Driessen J, de Jong J, Antalick J, Biancotto G, Cowles J, Felgueiras I, Haustraete K, Johannsen F, Muhonen; R, Nunes da Costa J, Pløger A, Shearan P, van der Kamp H, van Schalm K, Wagner K. Liquid Chromatographic Method to Determine Narasin in Feedingstuffs and Premixtures: Development, Validation, and Interlaboratory Study. J AOAC Int 2019. [DOI: 10.1093/jaoac/87.6.1278] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
A reversed-phase liquid chromatography (LC) method for narasin in feedingstuffs and premixtures was developed, validated, and interlaboratory studied. The extraction solvent was methanol–K2HPO4 solution (9 + 1, v/v). Narasin was detected at 600 nm after post-column derivatization with dimethylamino-benzaldehyde. Recovery was >90%. The repeatability (RSDr) in feed (20–140 mg/kg) ranged between 1.2 and 10.5%; the within-laboratory reproducibility (RSDR) ranged between 2.2 and 4.9%. The limit of determination was <20 mg/kg. Other feed additives did not interfere in the assay. The method showed ruggedness against changes in the composition of extraction solvent, eluent, and conditions for post-column reactions. In an interlaboratory study, 5 broiler feeds (4 positive, 1 blank) and 1 premixture were analyzed by 13 laboratories. The RSDr of the feedingstuffs (20–120 mg/kg) varied between 2.17 and 7.57%. The HORRAT ranged between 0.77 and 0.88, with recoveries between 82 and 104%. One laboratory detected small signals in the blank sample, calculated as 0.6 and 2.8 mg/kg. For the premixture, acceptable results for reproducibility could only be obtained after modification of the method: the RSDr was 4.42% and the HORRAT was 1.56 (12 laboratories).
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Affiliation(s)
- Alfred Thalmann
- State Agricultural Testing and Research Station Augustenberg (LUFA), Nesslerstr. 23, 76227 Karlsruhe, Germany
| | - Klaus Wagner
- State Agricultural Testing and Research Station Augustenberg (LUFA), Nesslerstr. 23, 76227 Karlsruhe, Germany
| | - Marinka Tomassen
- RIKILT–Institute of Food Safety, PO Box 230, 6700 AE, Wageningen, The Netherlands
| | - Jaap Driessen
- RIKILT–Institute of Food Safety, PO Box 230, 6700 AE, Wageningen, The Netherlands
| | - Jacob de Jong
- RIKILT–Institute of Food Safety, PO Box 230, 6700 AE, Wageningen, The Netherlands
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de Jong J, Tomassen M, Driessen J, Keukens H, Putzka HA, Brambilla G, Antalick JP, Biancotto G, Brambilla G, Checa-Moreno R, Cowles J, Faggionato E, Felgueiras I, Haustraete K, Johanssen F, Margry R, Michels K, Nunes da Costa J, Putzka HA, Schreuder C, Schwadorf K, Testa C, Ubaldi A, van der Kamp H, Van Schalm K. Liquid Chromatographic Method for Nicarbazin in Broiler Feeds and Premixtures: Development, Validation, and Interlaboratory Study. J AOAC Int 2019. [DOI: 10.1093/jaoac/87.6.1269] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
A reversed-phase liquid chromatography method for nicarbazin in broiler feeds and premixtures was developed, validated, and interlaboratory studied. The extraction solvent was an acetonitrile–methanol (1 + 1) mixture. For feedingstuffs, water was also added. The 4,4′-dinitrocarbanilide moiety of nicarbazin was detected at a wavelength of 350 nm. Recovery was ≥ 87%. At 20 mg/kg, the repeatability was 0.7% and the within-laboratory reproducibility was 2.7%. The limit of determination was <20 mg/kg. Other feed additives did not interfere in the assay that proved to be applicable to broiler feeds from different European Union countries. In an interlaboratory study, 4 positive broiler feeds, 1 blank pig feed, and 1 broiler premixture were analyzed by 19 laboratories using the method developed in this study. The relative standard deviation for repeatability (RSDr) of the feedingstuffs (20–240 mg/kg) varied between 2.6 and 10.2%. The HORRAT ranged between 0.70 and 1.22. Recoveries were 91–108%. Three laboratories detected small signals in the blind blank samples, ranging from 0.4 to 2 mg/kg. For the premixture, acceptable results for reproducibility could only be obtained after the sample weight and volume of extraction had been doubled. To avoid excessive dilution of the extracts, the range of the calibration curve had also been doubled. With this modified method, the RSDr was 5.7% and the HORRAT was 1.95 (10 laboratories).
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Affiliation(s)
- Jacob de Jong
- RIKILT-Institute of Food Safety, PO Box 230, 6700 AE, Wageningen, The Netherlands
| | - Marinka Tomassen
- RIKILT-Institute of Food Safety, PO Box 230, 6700 AE, Wageningen, The Netherlands
| | - Jaap Driessen
- RIKILT-Institute of Food Safety, PO Box 230, 6700 AE, Wageningen, The Netherlands
| | - Henk Keukens
- Laboratory of the Meat Inspection Service (LRVV), PO Box 144, 6700 AC, Wageningen, The Netherlands
| | - Hans-Artur Putzka
- Universität Hamburg, Institut für Angewandte Botanik, PO Box 302762, D-20309, Hamburg, Germany
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Affiliation(s)
- J Nunes da Costa
- Department of Plastic, Reconstructive and Maxillofacial Surgery, Hospital de Egas Moniz, CHLO, Lisbon, Portugal
| | - J Matias
- Department of Plastic, Reconstructive and Maxillofacial Surgery, Hospital de Egas Moniz, CHLO, Lisbon, Portugal
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