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Catalysts 2017, 7(2), 54; doi:10.3390/catal7020054

Enantioselective Transamination in Continuous Flow Mode with Transaminase Immobilized in a Macrocellular Silica Monolith

1
Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Place Louis Pasteur, 1, Box L4.01.09, 1348 Louvain-la-Neuve, Belgium
2
Institute of Life Sciences, Université catholique de Louvain, Place Croix du Sud 4-5, 1348 Louvain-la-Neuve, Belgium
*
Author to whom correspondence should be addressed.
Received: 10 January 2017 / Accepted: 7 February 2017 / Published: 10 February 2017
(This article belongs to the Special Issue Sol–Gel Chemistry: A Toolbox for Catalyst Preparation)
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Abstract

ω-Transaminases have been immobilized on macrocellular silica monoliths and used as heterogeneous biocatalysts in a continuous flow mode enantioselective transamination reaction. The support was prepared by a sol-gel method based on emulsion templating. The enzyme was immobilized on the structured silica monoliths both by adsorption, and by covalent grafting using amino-functionalized silica monoliths and glutaraldehyde as a coupling agent. A simple reactor set-up based on the use of a heat-shrinkable Teflon tube is presented and successfully used for the continuous flow kinetic resolution of a chiral amine, 4-bromo-α-methylbenzylamine. The porous structure of the supports ensures effective mass transfer and the reactor works in the plug flow regime without preferential flow paths. When immobilized in the monolith and used in the flow reactor, transaminases retain their activity and their enantioselectivity. The solid biocatalyst is also shown to be stable both on stream and during storage. These essential features pave the way to the successful development of an environmentally friendly process for chiral amines production. View Full-Text
Keywords: chiral amines; biocatalysis; silica monolith; enzyme immobilization; flow chemistr chiral amines; biocatalysis; silica monolith; enzyme immobilization; flow chemistr
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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van den Biggelaar, L.; Soumillion, P.; Debecker, D.P. Enantioselective Transamination in Continuous Flow Mode with Transaminase Immobilized in a Macrocellular Silica Monolith. Catalysts 2017, 7, 54.

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