▎ 摘　　要

We synthesized novel borate antitumor drugs sourced from starch-borate-graphene oxide (SBG) nanocomposites. In vitro results suggest that SBG from the molar ratio of n(starch) : n(borate) : n(GO) at 2 : 1 : 1 exhibits excellent biocompatibility with normal human cells (> 90% cell viability), but are highly toxic against cancer cells (<20% cell viability).