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Chiral Polyol Synthesis Catalyzed by a Thermostable Transketolase Immobilized on Layered Double Hydroxides in Ionic liquids

In this work we set out to study the activity of a thermostable Transketolase (TK) from Geobacillus stearothermophilus (TKgst) in an ionic liquid as cosolvent, which has never been investigated before with this enzyme. 1‐Butyl‐3‐methylimidazolium chloride ([BMIm][Cl]) in the range 30–50 % in water maintained the total activity of TKgst and increased the reaction rate in the presence of pentoses as acceptor substrates, particularly d‐ribose. To improve the synthetic process, TKgst was immobilized on an inorganic support, layered double hydroxides (LDHs), with excellent immobilization yield and catalytic activity using a simple, eco‐compatible, efficient coprecipitation procedure. The biohybrid MgAl@TKgst was tested in 30 % [BMIm][Cl] for the synthesis of a rare, very costly commercially available sugar, d‐sedoheptulose, which was obtained in one step from d‐ribose with an isolated yield of 82 %. This biohybrid was reusable over four cycles with no loss of enzymatic activity. The particular activity of free and immobilized TKgst in [BMIm][Cl] holds promise to extend the applications of TKgst in other ionic liquids and unusual media in biocatalysis.