Chitosan polymer as support to IgG immobilization for piezoelectric applications

► Chitosan backbone showed to be efficient for IgG immobilization using a gold support. ► Highest concentration of NaOH on chitosan film favored a better IgG immobilization. ► The response in QCM analysis was not as predicted by the Sauerbrey equation. ► A significant variation in the crystal frequency occurred by using 2 μg/mL IgG.