In this thesis, improved techniques for biomolecule analysis using capillary electrophoresis (CE) and matrix-assisted laser desorption/ionization-mass spectrometry (MALDI-MS) and hyphenations between those have been presented. A pre-concentration method which is possible to apply in both techniques, has also been investigated. In this work the off-line MS mode has been used either in the form o...

We studied the possibility of detection [Ru(η5-C5H5)(PPh3)2Cl] (abbreviated by RuCp) complex as a model system for Ru-based metallodrugs in human urine using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) without previous purification or removal inorganic salts. Inorganic salts might prevent RuCp MALDI-TOF MS, most likely through increased number and...

The Ionization Potential (IP) of chemical species is paramount importance for the Matrix Assisted Laser Desorption/Ionization (MALDI) analyticaltechnique. Specifically, IPs are used in MALDI MS Electron Transfer (ET) as a parameter to select matrix given family species. We useda quantum methodology computationally determine set photosensible phytoplanktonic pigments. These calculations could be...

The mechanism of in-source decay (ISD) in matrix-assisted laser desorption/ionization (MALDI) has been described. The MALDI-ISD with an oxidizing matrix is initiated by hydrogen abstraction from peptides to matrix molecules, leading to hydrogen-deficient peptide radicals. Subsequently, the C(α)-C and C(α)-H bonds are cleaved, forming the a•/x fragment pair and [M-2H], respectively. Those reacti...

Francisella tularensis is the cause of the zoonotic disease tularemia and is classified among highly pathogenic bacteria (HPB) due to its low infection dose and potential for airborne transmission. In the case of HBP, there is a pressing need for rapid, accurate and reliable identification. Phenotypic identification of Francisella species is inappropriate for clinical microbiology laboratories ...

Whole-cell fingerprinting by matrix-assisted laser desorption ionization-time-of-flight mass spectrometry (MALDI-TOF MS) in combination with a dedicated bioinformatic software tool (MALDI Biotyper 2.0) was used to identify 152 staphylococcal strains corresponding to 22 staphylococcal species. Spectra of the 152 isolates, previously identified at the species level using a sodA gene-based oligonu...

The specific molecular profiles of ovarian cancer interface zones (IZ), the region between tumors and normal tissues, were evaluated using a new method involving matrix-assisted laser desorption/ionization (MALDI)-imaging mass spectrometry (IMS). We analyzed three ovarian serous carcinomas using MALDI-IMS. Principal component analysis (PCA) was used to evaluate the quality of tissue spatial fea...

Mass spectrometry imaging (MSI) is a powerful tool to visualize the spatial distribution of molecules on a tissue section. The main limitation of MALDI-MSI of proteins is the lack of direct identification. Therefore, this study focuses on a MSI~LC-MS/MS-LF workflow to link the results from MALDI-MSI with potential peak identification and label-free quantitation, using only one tissue section. A...