Chemoenzymatic conversion of glycerol to lactic acid and glycolic acid

Abstract

Catalytic valorization of raw glycerol derived from biodiesel into high-value chemicals has attracted great attention. Here, we report chemoenzymatic cascade reactions that convert glycerol to lactic acid and glycolic acid. In the enzymatic step, a coenzyme recycling system was developed to convert glycerol into 1,3-dihydroxyacetone (DHA) with a yield of 92.3% in potassium phosphate buffer (300 mM, pH 7.1) containing 100 mM glycerol, 2 mM NAD⁺, 242 U/mL glycerol dehydrogenase-GldA and NADH oxidase-SpNox^K184R at 30 °C. Subsequently, NaOH or NaClO₂ catalyzes the formation of lactic acid and glycolic acid from DHA. The high yield of lactic acid (72.3%) and glycolic acid (78.2%) verify the benefit of the chemoenzymatic approaches.

Keywords

Chemoenzymatic catalysis / Glycerol / Dihydroxyacetone / Lactic acid / Glycolic acid

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Funding

Key Technologies Research and Development Program(2021YFC2102900)