2S
3 modified by oleic acid and PLGA-PEG-FA were obtained from Xi’an Ruixi Biological Technology Co., Ltd. (China). Perfluoropentane (PFP) was obtained from Strem Chemicals, Inc. (America). Cell Counting Kit-8 (CCK-8) was obtained from Dojindo (Japan). The 2-(4-Amidinophenyl)-6-indolecarbamidinedihydrochloride (DAPI) and Trypsin-EDTA solution (0.25% trypsin) were obtained from Beyotime Technology. Dichloromethane (CHCl
2) and isopropyl alcohol were obtained from Chongqing Chuan Dong Chemical Co., Ltd. (China). Poly (vinyl alcohol) (PVA), 1,1′-dioctadecyl-3,3,3′,3′- tetramethylindotricarbocyanine iodide (DiR) and Dialysis membrane (10000–12000Da) were obtained from Sigma-Aldrich Chemical Co., Ltd. (MW: 25000, America). McCoy’s 5A was obtained from Procell Life Science&Technology Co., Ltd.