Development of Excipient-Free Freeze-Dryable Unimolecular Hyperstar Polymers for Efficient siRNA Silencing

Liang Zhao, Xiang Wu, Xiaofeng Wang, Chunying Duan, Hongyan Wang, Amol Punjabi, Yang Zhao, Yuanwei Zhang, Zuoshang Xu, Haifeng Gao, Gang Han

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We designed a unimolecular hyperstar polymer for efficient small interfering RNA (siRNA) delivery that can be processed under repeated lyophilization and reconstitution without the need of any excipient. The hyperstar polymer contains a biodegradable hyperbranched core and is bound to siRNA through its thousands of cationic arms that radiate from its core. The siRNA/hyperstar complexes showed siRNA transfection efficiency that was superior to that of Lipofectamine2000 in regard to the gene for human Cu, Zn superoxide dismutase 1 (SOD1), whose mutation causes familial amyotrophic lateral sclerosis. More importantly, hyperstar polymers as unimolecular containers minimized the multipolymer cross-interaction during lyophilization, and this maintained the uniquely high transfection efficiency of the siRNA/hyperstar complexes after repeated freeze-drying and reconstitution without the conventional need for excipient.

Original languageEnglish (US)
Pages (from-to)700-704
Number of pages5
JournalACS Macro Letters
Issue number7
StatePublished - Jul 18 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry


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