title: Usefulness of an integrated microfluidic device (HPLC-Chip-MS) to enhance confidence in protein identification by proteomics.
abstract: Nanoflow liquid chromatography/mass spectrometry (nanoLC/MS) has become a current tool in proteomics applications increasingly used in the search for new biomarkers. A new integrated microfluidic device (HPLC-Chip), coupled to ion trap mass spectrometry (ITMS), appears as an innovative and robust tool for improving the identifications commonly performed by nanoLC/MS/MS. We tested this device for the identification of proteins obtained from two-dimensional gel electrophoresis or chromatography. The chip allows the measurement of reproducible retention times that, in association with m/z ratios, was found useful for identifying peptide sequences without ambiguity. A sensitivity increase of a factor of at least 5-fold is obtained compared to the results obtained previously in our laboratory by conventional nanoLC/MS/MS on the same ion trap. We conclude that this recently available microfluidic device can be a valuable tool during biomarker discovery programs, particularly identifying low-abundance proteins.
authors.affiliation: Laboratory of Protein Biochemistry and Proteomics, UMR CNRS 7033 (BioMoCeTi), UFR SMBH, Paris13 University, 93017 Bobigny cedex, France. hardouin@mbh.univ-paris13.fr
authors.forename: Julie
authors.initials: J
authors.lastname: Hardouin
authors.forename: Magalie
authors.initials: M
authors.lastname: Duchateau
authors.forename: Raymonde
authors.initials: R
authors.lastname: Joubert-Caron
authors.forename: Michel
authors.initials: M
authors.lastname: Caron
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation*; D036103:Nanotechnology / Q000295:instrumentation; D010449:Peptide Mapping / Q000379:methods*; D020543:Proteome / Q000032:analysis* / Q000737:chemistry*; D040901:Proteomics / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000295:instrumentation*; D018511:Systems Integration
chemical_list: D020543:Proteome