Disclosed are methods and systems using liquid chromatography/tandem mass spectrometry (LC-MS/MS) for the analysis of endogenous biomarkers isolated from biological samples. In certain embodiments, the samples comprise dried body fluids such as dried plasma.

Disclosed are methods and systems using liquid chromatography/tandem mass spectrometry (LC-MS/MS and 2D-LC-MS/MS) for the proteomic analysis of genotypes. In certain embodiments, samples used in the analysis comprise dried bodily fluids.

Provided herein are assay control materials comprising stable analytes and lyophilized unstable analytes, and methods of making and using the same.

The present invention relates to a DNA-replication-associated (Rep) protein for use in the diagnosis of multiple sclerosis (MS), wherein (a) an increased amount of Rep protein or fragments thereof in a sample from a subject as compared to an amount in a control sample; or an increased amount of anti-Rep protein antibodies with antigen in a sample from a subject as compared to an amount in a control sample correlates with a diagnosis of MS, wherein the Rep protein is a MSBI1 Rep or MSBI2 Rep.

Disclosed are methods and systems using liquid chromatography/tandem mass spectrometry (LC-MS/MS) for the analysis of endogenous biomarkers isolated from biological samples. In certain embodiments, the samples comprise dried body fluids such as dried plasma.

The present invention discloses a method for performing enzyme linked immunosorbent assay (ELISA) with simplified operation, including: preparing standards of a target protein with gradient dilutions and pre-diluting test samples; setting up wells for the standards and wells for the test samples on an ELISA plate, adding 100 ?l of the diluted standards and 100 ?l of the diluted samples into their respective wells, incubating, discarding the liquid, drying, washing the residue; adding 100 ?l of TMB chromogenic substrate into the wells of the standards and the wells of the test samples respectively, incubating at room temperature, adding 100 ?l of a stop solution to terminate the reaction in each well; placing the ELISA plate into an ELISA reader for dual-wavelength detection, calculating the concentration of a target protein in the samples. The overall operation time can be controlled within 90 minutes at minimum.

A device includes: a first portion configured to be grasped by the hand of the user, and a second portion defining a reservoir containing a control material, wherein the control material contains a target analyte in a known or predetermined concentration. A method of verifying the accuracy of an analyte monitoring device includes receiving control information, receiving a fluid sample, identifying the fluid sample as a control solution, and analyzing the control solution.

An IROA Matrix of metabolite compounds is disclosed. Each of whose compounds has a molecular weight of 2000 AMU or less, and is present as first and second isotopomers that are equally present at two predetermined isotopomeric balances, and contain 2 to 10% of a first isotope, and 90 to 98% of a second isotope, respectively. A reagent pair for transforming a natural abundance mass spectral analysis metabolite sample into an IROA sample is also disclosed and comprises two reactively identical reagents that constitute first and second isotopomers containing 2 to 10% of a first isotope, and 90 to 98% of a second isotope, respectively. Each of the reagent pair contains the same reactive group that reacts with and bonds to a functional group of one or more compounds present in a composition of biologically-produced metabolite compounds. Methods of making and using the above and related materials are also disclosed.

The present invention relates to a reference substance and a nucleic acid chip for generating binding information on biomolecules and analysis single-stranded nucleic acids in a biosample composed of biomolecules; a method for preparing the same; and a method for analyzing biomolecules using the same, and the reference substance and the nucleic acid chip can be used for analyzing the biological significance of the biomolecules. In addition, the present invention relates to a method for preparing an external reference substance and a biochip for generating the binding information on biomolecules and ligands; and a method for analyzing biomolecules using the same. The external reference substance and the biochip of the present invention can be used in the field of analyzing the biological significance of the biomolecules.

Provided are stimulus-sensitive microparticles and their use, e.g., in tracking the efficiency of recovery of a rare cell population (e.g., circulating tumor cells) from a mixture of cells; and in supplying control nucleic acids to index a molecular assay independent of the rare cell selection steps.