Figure 3From: Multifunctional polymeric nanoparticles doubly loaded with SPION and ceftiofur retain their physical and biological properties FTIR spectroscopy of PHBV nanoparticles. A) empty PHBV nanoparticles, B) PHBV/SPION nanoparticles, C) PHBV/SPION/CEF nanoparticles and D) PHBV/CEF nanoparticles. The controls, FTIR of ceftiofur, SPION and PHBV crystal are in Additional file 1.Back to article page