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Development of Microreactors and Analytical Methods for Lipid Transformations Open Access

Descriptions

Other title
Subject/Keyword
Lipid transformation
Enzyme
Microreactors
Analytical method
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Tuan Anuar, Tuan Nurul Sabiqah
Supervisor and department
Mugo, Samuel M (Department of Physical Sciences (Chemistry), Grant MacEwan)
Curtis, Jonathan M. (Agricultural, Food and Nutritional Science)
Examining committee member and department
Budge, Suzanne (Department of Process Engineering and Applied Science, Dalhousie University)
Serpe, Michael (Chemistry)
Bressler, David (Agricultural, Food and Nutritional Science)
Temelli, Feral (Agricultural, Food and Nutritional Science)
Department
Department of Agricultural, Food, and Nutritional Science
Specialization
Food Science and Technology
Date accepted
2013-08-01T13:32:04Z
Graduation date
2013-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
This thesis describes the development of two types of flow-through microreactors containing lipase immobilized onto either a hollow channel support within an optical microstructured fiber capillary (MSF) or onto a silica monolith within a fused silica capillary (SM). The large silica surface area within MSF or SM is suitable for enzyme immobilization. The enzymatic microreactors were used for rapid lipid transformations in small amounts suitable for analytical purposes. For the SM, the porous monolithic structure was formed based on the sol-gel method involving the reaction of poly(ethylene-glycol) with tetraethyl-orthosilicate at low pH and 40 °C followed by calcination at 200 °C. Candida antarctica lipase was immobilized onto both SM and MSF via silanization chemistry using glutaraldehyde-linkages. Successful enzyme immobilization was demonstrated by the FTIR spectra at each step of the immobilization process. The microreactors were tested by performing analytical scale transformations of triacylglycerols by reaction with ethanol. The effects of reaction temperature, flow rate and type of alcohol on the formation of lipid products were investigated. The data from GC and HPLC analyses indicate that the enzymatic MSF-microreactor was regioselective at 50 ºC, producing mainly 2-monooleoylglycerol from the transesterification reaction of trioleoylglycerol, at a flow rate of 1 μL/min. Using the SM-microreactor at room temperature, trioleoylglycerol and various vegetable oils (canola, sesame, soybean and refined-bleached-deodorized-palm) were quantitatively transformed into ethyl iii esters using flow rates of 0.2-0.5 μL/min. The microreactors were demonstrated to be reusable with minimal loss of activity for >8 runs when operated at room temperature and low flow rates (<1 μL/min). The potential use of the SM-microreactor in automated derivatization for the GC analysis of lipids was described. The SM-microreactor was also used to perform online lipid transformations by coupling it with atmospheric-pressure photoionization-mass spectrometry. An LC/MS method was developed for in-process monitoring of the epoxidation reactions of triacylglycerols. Reaction intermediates were observed allowing the determination of the time required for full or partial epoxidation of the oil. Overall, this thesis demonstrates a simple approach to the fabrication of enzymatic microreactors for analytical scale oleochemical transformations. Additionally, suitable methods for analyzing lipid transformations were developed.
Language
English
DOI
doi:10.7939/R3542JF1G
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Sabiqah Tuan Anuar, Carla Villegas, Samuel M. Mugo, Jonathan M. Curtis(2011). Lipids 46:545-55Sabiqah Tuan Anuar, Yuan-Yuan Zhao, Samuel M. Mugo, Jonathan M. Curtis2013). Journal of Molecular Catalysis B: Enzymatic 92: 62-70.Sabiqah Tuan Anuar, Yuan-Yuan Zhao, Samuel M. Mugo, Jonathan M. Curtis(2012). Journal of the American Oil Chemist Society. 89:1951-1960.

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