International Business Machines Corporation

Agency for Science, Technology and Research

Shujun Gao

James L Hedrick

Yi Yan Yang

Willy Chin

Min-Han Tan

Jye Yng Teo

Xiyu Ke

Yukti Choudhury

Shona Pek

Jackie Y Ying

Mohamed Shariff Mohamed Arshad Arshad

Pei Lin Mao

Amphiphilic block copolymers (BCPs) were prepared comprising a poly(ethylene oxide) block and a biodegradable polycarbonate block functionalized with disulfide groups and carboxylic acid groups. The BCPs form self-assembled micellar particles in aqueous solution that can be loaded with hydrophobic drugs for therapeutic drug delivery. The loaded particles have small particle sizes (&#x3c;100 nm), narrow particle size distributions, and high drug loading capacity (up to about 50 wt %) based on total dry weight of the loaded particles. Particles loaded with DOX released the DOX in response to changes in pH and glutathione (GSH) redox chemistry. The loaded particles efficiently delivered and released DOX within tumor cells, effectively suppressing growth of the tumor cells at a similar or even lower drug concentration than free DOX. Blank particles containing no DOX did not induce cytotoxicity to cells.

Block copolymers for therapeutic drug delivery

Growing community of inventors

Singapore, Singapore

Shujun Gao