Additionally, no noticeable histopathological abnormalities were found in livers, kidneys and spleens (Figure ). To assess the pharmacokinetics of PPC15 and PPC20 NPs, the same dose of NPs was injected into mice, from which the blood samples were collected and imaged at serval time points (Figure ). Blood circulation half-time of PPC15 and PPC20 NPs were both 4.5 hours.