Fig. 2

A The representative TEM images of the RLBP nanoparticles (left) and corresponding zoom images (right). The scale bars are 500 nm (left) and 100 nm (right). B Size distribution of the RLBP nanoparticles. C Zeta potential variations in the preparation of RLBP nanoparticles. D The stability of the RLBP nanoparticles was monitored with size distribution and PDI. E FTIR spectrum of RLBP, RBC membranes, levobupivacaine, and liposomes. F SDS-PAGE analysis of the (a) RLBP nanoparticles and the (b) RBC membranes. G Flow cytometry detects the fusion effect of DIO-labeled liposome and DID-labeled RBCM in the RLBP nanoparticles