Biodegradation of Graphene Materials Catalyzed by Eosinophil Peroxidase from Human Immune Cells
Understanding the biodegradability of graphene materials by the action of oxidative enzymes secreted by the immune cells is essential for developing applicable biomedical products based on graphene materials. Herein, we demonstrate the biodegradation of graphene oxide (GO) by recombinant eosinophil peroxidase (EPO) enzyme extracted from human eosinophils in the presence of a low concentration of hydrogen peroxide and NaBr. We compared the degradation capability of the enzyme on three different GO samples containing different degrees of oxygen functional groups on their graphenic lattices. EPO succeeded in degrading the three tested GO samples within 90 h treatment. Raman spectroscopy and transmission electron microscopy analyses provided clear-cut evidence for biodegradation of GO by EPO catalysis. Our results allow to better understand the biodegradation of graphene materials, helping to the design of future bulk composites and biomedical products based on these carbon nanomaterials.
- This article is part of the themed collection: Chemistry of 2-dimensional materials: beyond graphene