Mass spectrometric immunoassay analysis of specific proteins...

Chemistry: analytical and immunological testing – Nuclear magnetic resonance – electron spin resonance or other...

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C435S007100, C435S007920, C436S518000, C436S524000

Reexamination Certificate

active

10958867

ABSTRACT:
Presented herein is the construction of pipettor tips (termed MSIA-Tips) containing porous solid supports that are constructed, covalently derivatized with affinity ligand, and used to extract specific proteins and their variants from various biological fluids by repeatedly flowing the fluids through the MSIA-Tips. A second protein species (a mass-shifted variant of the targeted protein doped into the samples at a constant concentration) is co-extracted with the endogenous protein and variants and is used as a quantitative internal reference standard (IRS). Nonspecifcally bound compounds are rinsed from the MSIA-Tip using a series of buffer and water rinses, after which the wild type protein, protein variants and the IRS are eluted from the MSIA-Tips directly onto a target in preparation for analysis such as MALDI-TOF. Mass spectrometry of the eluted sample then follows with the retained proteins identified via accurate molecular mass determination. Protein and variant levels are determined via a quantitative method in which the protein/variant signals are normalized to the signal of the IRS and the values compared to a working curve constructed from samples containing known concentrations of the protein or variants.

REFERENCES:
patent: 4770774 (1988-09-01), Ida et al.
patent: 5437979 (1995-08-01), Rampal et al.
patent: 5538897 (1996-07-01), Yates et al.
patent: 5605798 (1997-02-01), Koster
patent: 5894063 (1999-04-01), Hutchens et al.
patent: 6974704 (2005-12-01), Nelson et al.
patent: 2030294 (1980-04-01), None
Gaskell, Quantification of steroid conjugates using fast atom bombardment mass spectrometery, Steroids, 1990, vol. 55, October, pp. 458-462.
Papac et al., Direct Analysis of Affinity-Bound Analytes by MALDI/TOF MS, Anal. Chem. 1994, 66, 2609-2613.
UniXL, Two Dimensional techniques—Gas Liquid Chromatography & Mass Spectrometry, http://www.unixl.com/dir/molecular-sciences/chemsitry/analytica/chemistry/two.dimens..., pp. 1-2, 2005.
Duncan et al., Quantitative Analysis of Low Molecular Weight Compounds of Biological Interest by Matrix-assisted Laser Desorption Ionization, Rapid Communications in Mass Spectrometry, vol. 7, 1090-1094, 1993.
Nuwaysir et al., Electrospray Ionization Mass Spectrometry of Phosphopeptides Isolated by On-line Immobilized Metal-Ion Affinity Chromatography, J Am Soc Mass Spectrom 1993, 4, 662-669.
Bieber et al., Mass Spectrometric Immunoassay, Anal. Chem. 1995, 67, 1153-1158.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Mass spectrometric immunoassay analysis of specific proteins... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Mass spectrometric immunoassay analysis of specific proteins..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mass spectrometric immunoassay analysis of specific proteins... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3936970

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.