Biomass upgrading using enzyme-photocatalyst coupled catalytic systems (EPCS) based on NADH

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dc.contributor.advisorHu, Jinguang
dc.contributor.authorShirvani, Hamed
dc.contributor.committeememberDonald Gates, Ian
dc.contributor.committeememberMahinpey, Nader
dc.date.accessioned2023-04-26T13:49:19Z
dc.date.available2023-04-26T13:49:19Z
dc.date.issued2023-04-04
dc.description.abstractThe development of sustainable methods to transform biomass into value-added products is crucial to realize the circular bioeconomy and mitigate the happening climate change. Photocatalysis and biocatalysis have emerged as two such methods in recent years. However, there are some significant obstacles for each one of them. Recently, inspired by the process of photosynthesis in nature, enzyme-photocatalyst-coupled systems (EPCSs) based on Nicotinamide adenine dinucleotide, reduced (NADH) has offered a new method that could potentially mitigate the drawbacks of each one of these methods and yield interesting synergy. In this study, we indicate the huge potential of zinc-blende (ZB) CdS as an outstanding catalyst for NADH regeneration in EPCSs with a rate of 13.1 mM/h, the highest reported in the literature, to the best of our knowledge. The catalyst shows decent stability for repeated cycles. In the second part, we report for the first time, the photoenzymatic reduction of levulinic acid, a major platform chemical derived from biomass. This serves as an example to expand the reaction spectrum of EPCSs based on NADH to enzymes and reactions beyond those that are frequently used. Almost 4 mM of levulinic acid could be reduced within 3 hours using the EPCS. During the course of this study, we also examined the importance of the sacrificial electron donor (SED) in the EPCSs, for the first time, and showed that our catalyst can accept various chemicals, especially glycerol, as SED. Besides, we report some unprecedented cross-inhibitory effects between SED and the enzyme which should be considered for future studies.
dc.identifier.citationShirvani, H. (2023). Biomass upgrading using enzyme-photocatalyst coupled catalytic systems (EPCS) based on NADH (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.
dc.identifier.urihttp://hdl.handle.net/1880/116105
dc.identifier.urihttps://dx.doi.org/10.11575/PRISM/dspace/40951
dc.language.isoen
dc.publisher.facultyGraduate Studies
dc.publisher.institutionUniversity of Calgary
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subjectEPCS
dc.subjectenzyme
dc.subjectphotocatalyst
dc.subjectbiomass
dc.subjectNADH
dc.subject.classificationEngineering--Chemical
dc.titleBiomass upgrading using enzyme-photocatalyst coupled catalytic systems (EPCS) based on NADH
dc.typemaster thesis
thesis.degree.disciplineEngineering – Chemical & Petroleum
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.thesis.accesssetbystudentI require a thesis withhold – I need to delay the release of my thesis due to a patent application, and other reasons outlined in the link above. I have/will need to submit a thesis withhold application.
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