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Identifier 000426169
Title α)CD-C3N4 ως φωτοευαισθητοποιητής σε αντιδράσεις ενίου και μεταφοράς ηλεκτρονίου β)Ενθυλάκωση αναγωγικού ενζύμου σε νανοσωματίδια βιοπολυμερών : μελέτη καταλυτικής δράσης του νέου νανοαντιδραστήρα
Alternative Title a)CD-g-C3N4 as photosensitizer for ene reaction and electron transfer reaction, b)Encapsulation of reducing enzyme in biopolymer nanoparticles: study of catalytic activity of the new nano-reactor
Author Χατζούδης, Απόστολος Θ.
Thesis advisor Σμόνου, Ιουλία
Reviewer Βελώνια, Καλλιόπη
Στρατάκης, Εμμανουήλ
Abstract The first chapter presents a new photocatalytic reactivity of carbon-nanodot-doped graphitic carbon nitride (CD-C3N4) with alkenes and dienes. It is shown that CD-C3N4 photosensitizes the oxidation of unsaturated substrates in a variety of solvents according to two competing mechanisms: the energy transfer via singlet oxygen (1Ο2) and/or the electron transfer via superoxide (O2•‾). The singlet oxygen, derived by the CD-C3N4 photosensitized process, reacts with alkenes to form allylic hydroperoxides (ene products) whereas with dienes, endoperoxides. When the electron transfer mechanism operates, cleavage products are formed, derived from the corresponding dioxetanes. Which of the two mechanisms will prevail depends on solvent polarity and the particular substrate. The photocatalyst remains stable under the photooxidation conditions, unlike the most conventional photosensitizers, while the heterogeneous nature of CD-C3N4 overcomes usual solubility problems. The second chapter presents the encapsulation of the reducing enzyme Kred112 into protein-polysyrene nanoparticles which are synthesized via a controlled atom transfer radical polymerization. The catalytic activity of the nanoreactor, which contains the reducing enzyme, is studied in aqueous solution in the reduction of an α,α-unsaturated keto ester. The products of the catalyzed by the encapsulated enzyme reduction are compared to those from the bioreduction by the free, native enzyme, using chromatographic methods. Αn unexpected reduction of the substrate‟s double bond is observed. These preliminary results showed different catalytic behavior of the nanoreactor in the particular reduction system.
Language Greek
Subject Amphiphilic biopolymer
Ene products
Graphitic carbon nitride
Ketoreductase Kred112
Photooxidation mechanism
Singlet oxygen
Αμφίφιλο συζυγές πρωτεΐνης-πολυμερούς
Γραφιτικό νιτρίδιο του άνθρακα
Δευτερογενείς μεταβολίτες
Νηχανισμός φωτοοξείδωσης
Οξυγόνο απλής κατάστασης
Προϊόντα ενίου
Issue date 2019-11-29
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Chemistry--Post-graduate theses
  Type of Work--Post-graduate theses
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