Method for the detection of proteins of animal origin in...

G - Physics – 01 – N

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G01N 27/64 (2006.01) G01N 33/02 (2006.01) G01N 33/68 (2006.01) G01N 30/72 (2006.01)

Patent

CA 2477891

The purpose of the present invention is to evaluate the quality of feed for ruminants and consequently, avoid the transmission of TSEs through the detection of animal proteins in these foods. This purpose is embodied in the form of a method for detecting proteins of animal origin in complex mixtures comprising the stages of: (i) extraction of the proteic matter in high concentration from a sample of the initial complex mixture in a manner as to substantially remove all interferents; (ii) preparation of the matrix-analyse in a manner as to maintain low levels of impurities and an adequate matrix- analyte molar rate; (iii) analysis of the material obtained in the prior stage by MALDI-TOF mass spectrometry; (iv) optionally, fractionation of the samples or isolation of the components by RP-HPLC and identification of the components by means of automatic sequencing of the N-terminal region and sequencing of its peptidic fragments by liquid chromatography coupled to mass spectrometry (LC/MS/MS). The present invention also contemplates the use of this method in the detection of proteins of animal origin in feed for ruminants, which permits the interruption of transmission of Transmittable Spongiform Encephalopaties, and more particularly Bovine Spongiform Encephalopaties (BSE).

La présente invention a pour objet d'évaluer la qualité de la nourriture des ruminants et par conséquent, d'éviter la transmission d'encéphalopathies spongiformes transmissibles (EST) à travers la détection de protéines animales dans lesdits aliments. Ledit objet apparaît à travers une méthode de détection de protéines d'origine animale dans des mélanges complexes consistant à: (i) extraire la matière protéique en concentration élevée d'un échantillon du mélange complexe initial de manière à éliminer sensiblement tous les interférants; (ii) préparer l'analyte-matrice de manière à conserver de faibles niveaux d'impuretés et un rapport molaire analyte-matrice adéquat; (iii) analyser la matière obtenue lors de l'étape précédente par spectrométrie de masse MALDI-TOF; (iv) éventuellement, fractionner des échantillons ou isoler des constituants par chromatographie liquide à haute performance à polarité de phase inversée et identifier des constituants par séquençage automatique de la région N-terminale et séquençage de ses fragments peptidiques par chromatographie liquide couplée à une spectrométrie de masse (CL/SM/SM). La présente invention concerne également l'utilisation de ladite méthode dans la détection de protéines d'origine animale dans la nourriture des ruminants, ce qui permet d'interrompre la transmission d'encéphalopathies spongiformes transmissibles, et plus particulièrement d'encéphalopathies spongiformes bovines (ESB).

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