Chitosan with average molecular weight (MW) of 1KDa, 3KDa, 10KDa, 50KDa and 300KDa was purchased from Aoxing Biotechnology Co. Ltd.. Doxorubicin (Dox), fluorescein (Flu) were purchased from Sigma-Aldrich. RPMI-1640 medium, thiazolyl blue (MTT), fetal bovine serum and trypsin were purchased from Keygen Biotech. Inc.. Octanal, sodium borohydride (NaBH4) were purchased from China National Medicine Corporation Ltd.. MPA (MW: 995) was prepared in our laboratory following Achilefu's report [33 (link), 34 (link)]. All other solvents and reagents used in this study were certified analytical reagent grade.
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