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Schematic representation of the functionalization of CNTs using NOVOZYME 435. Acid-treated CNTs display carboxyl groups due to oxidation, and these carboxyl groups are susceptible to reacting with the hydroxyl groups of some amino acids (threonine, serine, or tyrosine) present in proteins—a reaction that is catalyzed by Novozyme 345 (lipase) under anhydrous conditions.
