Insoluble Chromogenic Biomass-Based Enzyme Screening: An Assay to Evaluate the Degradation Activity of Plant Biomass-Degrading Enzymes

Biomass is a plant-derived organic matter primarily composed of complex polysaccharides. Carbohydrate-degrading enzymes act on these polysaccharides to produce smaller oligosaccharides.

To evaluate the degradation activity of an enzyme, begin by taking different insoluble chromogenic biomass - ICB substrates present in the wells of a porous reaction plate. These substrates are obtained from dyeing plant-derived materials with a specific color chlorotriazine dye. The resultant biomass has dye-tagged complex polysaccharides serving as a substrate for enzyme activity.

Now, add a buffer solution containing carbohydrate-hydrolyzing enzyme. The buffer maintains the pH for optimum enzyme activity. Place the reaction plate on a shaker, and incubate. Constant agitation allows the enzyme molecules to reach the target polysaccharide in the ICB substrate.

During incubation, the hydrolyzing enzyme cleaves covalent glycosidic bonds within the long-chain polysaccharides. The reaction produces soluble oligosaccharides linked to dye molecules, which remain in the solution.

Upon completion of degradation, place the reaction plate on top of a product plate and centrifuge the assembly. During centrifu