Apolipoprotein fingerprinting technique

G - Physics – 01 – N

Patent

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G01N 33/543 (2006.01) G01N 33/68 (2006.01) G01N 27/00 (2006.01) H01J 49/26 (2006.01)

Patent

CA 2681010

A method for determining the concentration and modifications of apolipoprotein in biological samples including plasma, serum, and lipoprotein fractions, by obtaining a sample from a patient, adding a specific volume of an internal standard to the sample, applying the sample to a surface-enhanced, Protein G-coated, antibody-bound chip and removing unbound sample components, analyzing the sample by mass spectrometry, determining the concentration of the apolipoprotein using values of internal standards, and evaluating the concentration of the apolipoprotein, its isoforms, amino acid substitutions and modifications for use as a tool for diagnosing diabetes, stroke, stress, Alzheimer's disease, and cardiovascular diseases (for example, lipid disorders, metabolic syndrome, obesity, atherosclerosis, etcetera).

L'invention concerne un procédé pour déterminer la concentration et les modifications de l'apolipoprotéine dans des échantillons biologiques comprenant du plasma, du sérum et des fractions de lipoprotéine, qui consiste à: obtenir un échantillon d'un patient, ajouter à l'échantillon un volume spécifique d'étalon interne; appliquer l'échantillon sur une puce à surface améliorée, liée à un anticorps et enrobée de protéine G, et éliminer les composants non liés de l'échantillon; analyser l'échantillon par spectrométrie de masse; déterminer la concentration de l'apolipoprotéine à l'aide de valeurs d'étalons internes; et évaluer la concentration de l'apolipoprotéine, de ses isoformes, de ses substitutions et de ses modifications d'acides aminés de manière à former un outil permettant de diagnostiquer le diabète, l'accident vasculaire cérébral, le stress, la maladie d'Alzheimer et les maladies cardiovasculaires (par exemple les troubles lipidiques, le syndrome métabolique, l'obésité, l'athérosclérose, etc.)

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