Chemo-enzymatic One-Pot Depolymerization of β-Chitin

Abstract

Decreasing our reliance on fossil carbon requires economically viable and scalable pathways to utilize sustainable sources, such as chitin. Current methods for converting chitin to high-value chemicals require treatment with strong acids and/or bases at high temperature, thereby giving complicated product mixtures with substantial, negative environmental impact. Here we present a chemo-enzymatic cascade in which H2O2, generated in situ over Pd-based nanoalloys, is used by a lytic polysaccharide monooxygenase (LPMO) to convert chitin into soluble oligosaccharide fragments. Our approach, which minimizes oxidative damage to the enzyme, eliminates the need for atom-inefficient and energy intensive approaches to chitin depolymerization, potentially achieving substantial environmental and economic savings. The simplicity of this chemo-catalyst/enzyme cascade has significant advantages for accessing chitin as a bio-carbon resource.