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Multi-functional mikto-arm star polymers containing three different arms[hydrophilic,SN-38-P(OEGMA8?9)11,cationizable,SN-38-P(DMAEMA)38 and hydrophobic,SN-38-P(BMA)26]were prepared by RAFT polymerization via an arm-first approach using a cleavable cross-linker.The star polymers were cleaved to the linear arms with tributylphosphine as a reducing agent.The decrease in molecular weight observed is consistent with the initial stars having approximately five arms.Blue fluorescence was observed when a solution of mikto-arm star was irradiated under a 365 nm light proving the retention of the SN-38moiety during star formation by RAFT polymerization.Thus these polymer-drug conjugates can be considered as potential delivery vehicles for cancer therapy.The P(DMAEMA)arms can be quaternized using iodomethane,allowing star polymers to bind negatively charged small interfering RNA(siRNA)and potentially be used as a carrier for that material.
Multi-functional mikto-arm star polymers containing three different arms [hydrophilic, SN-38-P (OEGMA8®9) 11, cationizable, SN-38- ] were prepared by RAFT polymerization via an arm-first approach using a cleavable cross-linker. The star polymers were cleaved to the linear arms with tributylphosphine as a reducing agent. The decrease in molecular weight observed is consistent with the initial stars having approximately five arms. Blue fluorescence was observed when a solution of mikto-arm star was irradiated under a 365 nm light proving the retention of the SN-38moiety during star formation by RAFT polymerization. These polymer-drug conjugates can be considered as potential delivery vehicles for cancer therapy. The P (DMAEMA) arms can be quaternized using iodomethane, allowing star polymers to bind negatively charged small interfering RNA (siRNA) and potentially be used as a carrier for that material.