Method for generation and use of isotopic patterns in mass...

C - Chemistry – Metallurgy – 12 – Q

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C12Q 1/02 (2006.01) G01N 27/00 (2006.01) G01N 33/60 (2006.01)

Patent

CA 2702845

A method for identifying a biological analyte that is affected by a stressor is disclosed in which two substantially identical biological samples are provided, with a first sample being a control sample and a second sample being an experimental sample. The control sample is grown with a nutrient having an isotope of a first atom, whereas the experimental sample is grown with a nutrient having a second isotope of the first atom. The experimental sample is grown with a stressing agent and regimen. The samples are admixed, and the formed composite is mass spectroscopically assayed for analyte peaks. The ratio of first isotope to second isotope is determined for the peaks, as is a sample median isotopic ratio. The ratio for assayed analyte peaks is compared with the median ratio. An analyte whose isotopic ratio significantly deviates from the median ratio is an analyte affected by the stressing agent.

L'invention concerne un procédé pour identifier un analyte biologique qui est affecté par un facteur de stress, dans lequel deux échantillons biologiques sensiblement identiques sont fournis, le premier échantillon étant un échantillon témoin et le second échantillon étant un échantillon expérimental. L'échantillon témoin est cultivé avec un nutriment contenant un isotope d'un premier atome, alors que l'échantillon expérimental est cultivé avec un nutriment contenant un second isotope du premier atome. L'échantillon expérimental est cultivé avec un agent et un régime stressants. Les échantillons sont mélangés et le composite formé est analysé par spectroscopie de masse pour déterminer les pics d'analyte. Le rapport du premier isotope au second isotope est déterminé pour les pics, ainsi que le rapport isotopique médian de l'échantillon. Le rapport pour les pics d'analyte est comparé au rapport médian. Un analyte dont le rapport isotopique dévie significativement du rapport médian est un analyte affecté par l'agent stressant.

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