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  • Lapointe, Michel R  (3)
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  • 1
    Online Resource
    Online Resource
    High-Speed Liquid Chromatographic Determination of Monensin, Narasin, and Salinomycin in Feeds, Using Post-Column Derivatization
    Oxford University Press (OUP) ; 1988
    In:  Journal of AOAC INTERNATIONAL Vol. 71, No. 3 ( 1988-05-01), p. 480-484
    Details
    In: Journal of AOAC INTERNATIONAL, Oxford University Press (OUP), Vol. 71, No. 3 ( 1988-05-01), p. 480-484
    Abstract: A high-speed liquid chromatographic (LC) method using post-column derivatization is described for the determination of monensin, narasin, and salinomycin in a variety of animal feeds. The ionophores are extracted with hexane-ethyl acetate (90 + 10). A portion of the sample is evaporated, diluted to a known volume, and analyzed using a 6 cm 3 μm C18 column and an absorbance detector after post-column reaction with vanillin. The method has been applied to poultry and swine feeds with levels of 3-100 ppm added antibiotic. A comparison was also carried out with medicated poultry feed and beef feed lot supplement samples previously analyzed by 2 separate bioassay methods for monensin and salinomycin, respectively. Recoveries for the LC method ranged from 92.1 to 103% with an average recovery of 98.1% and a coefficient of variation of 3.65%.
    Type of Medium: Online Resource
    ISSN: 0004-5756
    URL: Article
    DOI: 10.1093/jaoac/71.3.480
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 1988
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Determination of Vitamin E in Animal Feeds by Normal Phase High Pressure Liquid Chromatography
    Oxford University Press (OUP) ; 1980
    In:  Journal of AOAC INTERNATIONAL Vol. 63, No. 6 ( 1980-11-01), p. 1254-1257
    Details
    In: Journal of AOAC INTERNATIONAL, Oxford University Press (OUP), Vol. 63, No. 6 ( 1980-11-01), p. 1254-1257
    Abstract: A simple and rapid quantitative method for the determination of vitamin E in animal feeds is described. The method involves direct extraction with a mixture of isooctane–l,4-dioxane (80 + 20) followed by saponification. Additional purification was achieved by using a silica gel Sep-Pak. Elution time for vitamin E alcohol was 7.98 min (standard deviation (SD) 0.06) using a Partisil-10 PAC column and an isocratic mobile phase of hexane–dichloromethane–isopropanol (70 + 30 + 0.2) with a flow rate of 1 mL/min, and detection at 292 nm and 0.01 AUFS by a variable UV monitor. The average recovery of vitamin E was 96.64% (SD 5.19) in 4 different animal feeds. The method compared favorably with the official AOAC method. The minimum detectable amount of vitamin E in an animal feed is 10 IU/kg.
    Type of Medium: Online Resource
    ISSN: 0004-5756
    URL: Article
    DOI: 10.1093/jaoac/63.6.1254
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 1980
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Sephadex LH-20 Cleanup, High Pressure Liquid Chromatographic Assay, and Fluorescence Detection of Zearalenone in Animal Feeds
    Oxford University Press (OUP) ; 1980
    In:  Journal of AOAC INTERNATIONAL Vol. 63, No. 3 ( 1980-05-01), p. 642-646
    Details
    In: Journal of AOAC INTERNATIONAL, Oxford University Press (OUP), Vol. 63, No. 3 ( 1980-05-01), p. 642-646
    Abstract: A high pressure liquid chromatographic (HPLC) method is described to determine zearalenone in animal feeds at levels as low as 0.01 ppm. Samples are extracted with chloroform-ethanol and initially purified using a SEP-PAK silica cartridge, followed by column chromatography using Sephadex LH-20. Separation by normal phase HPLC is followed by fluorescence detection. Recoveries at levels of 1.0–0.01 ppm averaged greater than 90%. Confirmation included HPLC analysis of the sample and a zearalenone standard, using 3 different excitation wavelengths, and comparison of fluorescence responses obtained. The method was successfully applied to the analysis of 1 corn and 3 cornmeal samples. Zearalenone was detected in all 4 samples at levels of 0.379–19.2 ppm.
    Type of Medium: Online Resource
    ISSN: 0004-5756
    URL: Article
    DOI: 10.1093/jaoac/63.3.642
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 1980
    Location Call Number Limitation Availability
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    Online Resource
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