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Development of novel mass spectrometry-based approaches for searching for low-mass tyrosinase inhibitors in complex mixtures

Abstract : This thesis report presents the development of mass spectrometry-based methods for searching for inhibitors of enzymes in complex mixtures, such as plant extracts. Tyrosinase enzyme was used as the main biological target for the reason of a significant importance of its inhibitors in the cosmetic industry as the skin whitening agents. The first part of this report describes Frontal Affinity Chromatography (FAC), an approach enabling simultaneous ranking the inhibitors within the complex mixture according to their affinities to the biological target. Two hydrophilic capillary-scale polymer-based bioaffinity stationary phases were evaluated in the context of the presence of undesirable nonspecific interactions between the analyte and the solid immobilisation support. In addition, we explored the usability of two types of silica-based particles as a solid support for enzyme immobilisation for FAC. The second part of the thesis manuscript is devoted to Enzyme-coupled Nanoparticle-Assisted Laser Desorption/Ionisation Mass Spectrometry (ENALDI MS) as a low-mass compatible extension of the Intensity ion Fading MALDI MS (IF-MALDI MS) method for high-throughput screening of the inhibitors in the complex mixtures. Two variations of ENALDI MS were evaluated: 'Ion Fading' (IF-ENALDI MS), based on on-the-spot binding of inhibitors by enzyme molecules and 'Ion Hunting' (IH-ENALDI MS), based on selective pre-concentration of inhibitors present in the sample.
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https://tel.archives-ouvertes.fr/tel-01223001
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Aleksander Salwiński. Development of novel mass spectrometry-based approaches for searching for low-mass tyrosinase inhibitors in complex mixtures. Other. Université d'Orléans, 2014. English. ⟨NNT : 2014ORLE2013⟩. ⟨tel-01223001⟩

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