Figure 4. Shape and size analysis of blank-bovine serum albumin nanoparticles (BSA NPs), catechin-bovine serum albumin nanoparticles (CAT-BSA NPs) and epicatechin-bovine serum albumin nanoparticles (ECAT-BSA NPs). Atomic force microscope (AFM) images of (a) blank-BSA NPs, (b) CAT-BSA NPs, (c) ECAT-BSA NPs. Transmission electron microscope (TEM) images of (d) blank- BSA NPs, (e) CAT-BSA NPs, (f) ECAT-BSA NPs.