title: Material-enhanced laser desorption/ionization (MELDI)--a new protein profiling tool utilizing specific carrier materials for time of flight mass spectrometric analysis.
abstract: Over the past couple of years, proteomics pattern analysis has emerged as an effective method for the early diagnosis of diseases such as ovarian, breast, or prostate cancer, without identification of single biomarkers. MALDI-TOF MS, for example, offers a simple approach for fast and reliable protein profiling, especially by using carrier materials with various physical and chemical properties, in combination with a MALDI matrix. This approach is referred to as material-enhanced laser desorption/ionization (MELDI). In this paper, we report the development and application of derivatized carrier materials [cellulose, silica, poly(glycidyl methacrylate/divinylbenzene) (GMA/DVB) particles, and diamond powder] for fast and direct MALDI-TOF MS protein profiling. The applicability of MELDI for rapid protein profiling was evaluated with human serum samples. These carriers, having various hydrophobicities, resulted in characteristic mass fingerprints, even if all materials were derivatized with iminodiacetic acid (IDA) to yield an immobilized metal affinity chromatography (IMAC) functionality. Our study demonstrates that analyzing complex biological samples, such as human serum, by employing different MELDI carrier materials yielded type- and size-dependent performance variation.
authors.affiliation: Institute of Analytical Chemistry and Radiochemistry, Leopold Franzens University, Innsbruck, Austria. Isabel.Feuerstein@uibk.ac.at
authors.forename: Isabel
authors.initials: I
authors.lastname: Feuerstein
authors.forename: Muhammad
authors.initials: M
authors.lastname: Najam-ul-Haq
authors.forename: Matthias
authors.initials: M
authors.lastname: Rainer
authors.forename: Lukas
authors.initials: L
authors.lastname: Trojer
authors.forename: Rania
authors.initials: R
authors.lastname: Bakry
authors.forename: Nurul Hidayat
authors.initials: NH
authors.lastname: Aprilita
authors.forename: Günther
authors.initials: G
authors.lastname: Stecher
authors.forename: Christian W
authors.initials: CW
authors.lastname: Huck
authors.forename: Günther K
authors.initials: GK
authors.lastname: Bonn
authors.forename: Helmut
authors.initials: H
authors.lastname: Klocker
authors.forename: Georg
authors.initials: G
authors.lastname: Bartsch
authors.forename: Andras
authors.initials: A
authors.lastname: Guttman
mesh_terms: D007202:Indicators and Reagents; D010449:Peptide Mapping / Q000379:methods*; D011506:Proteins / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013048:Specimen Handling / Q000379:methods*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*
chemical_list: D007202:Indicators and Reagents; D011506:Proteins