A three-functional nanocomposite was prepared by radical polymerization of methacrylic acid around carbon nanotubes in the presence of Quercetin as biologically active molecule and proposed as new anticancer therapeutic. The so-obtained hybrid material was characterized by FT-IR, Raman, SEM, TEM analyses, while the functionalization degree of 2.33mg of Quercetin per g of composite was assessed by Folin–Ciocalteu test. Antioxidant test (DPPH and ABTS) showed that the covalent coupling did not interfere with the antioxidant properties of the flavonoid, while the anticancer activity was greatly enhanced with a recorded IC 50 value much lower than free Quercetin. Cell viability tests on healthy cells demonstrated no-toxicity of the conjugate