In the present study. we aimed to develop a fast. non-toxic ultrasonic-assisted technique for the preparation of graphene oxide (GO) and GO that were accessorized with Fe3O4 (GO-Fe3O4) for enzyme immobilization. The structural properties of nanosheets were determined by FTIR. https://parisnaturalfoodes.shop/product-category/toothpaste-citrus-spice-blend/