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Operational stabilities of different chemical derivatives of Novozym 435 in an alcoholysis reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
16771 42611 2016 10 PDF Available
Title
Operational stabilities of different chemical derivatives of Novozym 435 in an alcoholysis reaction
Abstract

•Improved features of Novozym 435 by trinitrobenzensulfonic acid modification.•Novozym 435 derivatization by trinitrobenzensulfonic acid favors oil alcoholysis.•Chemical modification of Novozym 435 improves its mecanical resistance.•TNBS derivatization of Novozym 435 reduces product precipitation in oil alcoholysis.

Industrial use of Novozym 435 in synthesis of structured lipids and biodiesel via alcoholysis is limited by mass transfer effects of the glycerides through immobilized enzymes and its low operational stability under operation conditions. To better understand this, differently modified Novozym 435 preparations, differing in their surface nature and in their interactions with reactants, have been compared in the alcoholysis of Camelina sativa oil. The three modifications performed have been carried out under conditions where all exposed groups of the enzyme have been modified. These modifications were: 2,4,6-trinitrobenzensulfonic acid (Novo-TNBS), ethylendiamine (Novo-EDA) and polyethylenimine (Novo-PEI). Changes in their operational performance are analyzed in terms of changes detected by scan electron microscopy in the support morphology.The hydrophobic nature of the TNBS accelerates the reaction rate; t-ButOH co-solvent swells the macroporous acrylic particles of Lewatit VP OC 1600 in all biocatalysts, except in the case of Novo-PEI. This co-solvent only increases the maximal conversions obtained at 24 h using the modified biocatalysts. t-ButOH reduces enzyme inactivation by alcohol and water. In a co-solvent system, these four biocatalysts remain fully active after 14 consecutive reaction cycles of 24 h, but only Novo-TNBS yields maximal conversion before cycle 5. Some deposits on biocatalyst particles could be appreciated during reuses, and TNBS derivatization diminishes the accumulation of product deposits on the catalyst surface. Most particles of commercial Novozym® 435 are broken after operation for 14 reaction cycles. The broken particles are fully active, but they cause problems of blockage in filtration operations and column reactors. The three derivatizations studied make the matrix particles more resistant to rupture.

Keywords
Alcoholysis; Camelina oil; Biodiesel; Operational stability; Novozym® 435; Enzyme immobilization; Structured lipids
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Operational stabilities of different chemical derivatives of Novozym 435 in an alcoholysis reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 90, August 2016, Pages 35–44
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us