title: Quantitative analysis of tryptic protein mixtures using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry.
abstract: For the first time, quantitative analysis of tryptic protein mixtures, labeled with Quantification-Using-Enhanced-Signal-Tags (QUEST)-markers, were performed with electrospray ionization and a 9.4 T Fourier Transform Ion Cyclotron Resonance (FTICR) mass spectrometer. Coupling a High-Pressure Liquid Chromatography (HPLC) separation step prior to mass analysis resulted in an increased amount of identified labeled tryptic peptides. The range for the determined intensity ratios of two peptides in a labeled pair was large, but the obtained median intensity ratio correlated very well with the corresponding concentration ratio. This method can be used for observing protein dynamics in a specific cell type, tissue, or in body fluids.
authors.affiliation: Department of Engineering Sciences, Division of Ion Physics, Uppsala University.
authors.forename: Charlotte
authors.initials: C
authors.lastname: Hagman
authors.forename: Margareta
authors.initials: M
authors.lastname: Ramström
authors.forename: Per
authors.initials: P
authors.lastname: Håkansson
authors.forename: Jonas
authors.initials: J
authors.lastname: Bergquist
mesh_terms: D000818:Animals; D002417:Cattle; D002851:Chromatography, High Pressure Liquid; D017357:Cyclotrons / Q000295:instrumentation; D005583:Fourier Analysis; D006847:Hydrocarbons, Iodinated / Q000737:chemistry; D007460:Iodoacetamide / Q000737:chemistry; D010455:Peptides / Q000737:chemistry*; D011506:Proteins / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D006847:Hydrocarbons, Iodinated; D010455:Peptides; D011506:Proteins; D012710:Serum Albumin, Bovine; C014055:methyl iodide; D007460:Iodoacetamide