Polymer-albumin conjugate for the facilitated delivery of macromolecular platinum drugs

Aydan Dag, Yanyan Jiang, Khairil Juhanni Abd Karim, Gene Hart-Smith, Wei Scarano, Martina H. Stenzel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


The delivery of macromolecular platinum drugs into cancerous cells is enhanced by conjugating the polymer to albumin. The monomers N-(2-hydroxypropyl)methacrylamide (HPMA) and Boc protected 1,3-diaminopropan-2-yl acrylate (Ac-DAP-Boc) are copolymerized in the presence of a furan protected maleimide functionalized reversible addition-fragmentation chain transfer (RAFT) agent. The resulting polymer with a composition of P(HPMA14-co-(Ac-DAP-Boc)9) and a molecular weight of Mn = 7600 g mol-1 (Ð = 1.24) is used as a macromolecular ligand for the conjugation to the platinum drug. Thermogravimetric analysis reveals full conjugation. After deprotection of the maleimide functionality of the polymer, the reactive polymer is conjugated to albumin using the Cys34 functionality. The conjugation is monitored using size exclusion chromatography, MALDI-TOF (matrix assisted laser desorption ionization time-of-flight), and SDS Page (sodium dodecyl sulphate polyacrylamide gel electrophoresis). The polymer-albumin conjugates self-assemble in water into nanoparticles of sizes of around 80 nm thanks to the hydrophobic nature of the platinum drugs. The albumin coated nanoparticles are readily taken up by ovarian cancer cell lines and they show superior toxicity compared to a control sample without protein coating.

Original languageEnglish
Pages (from-to)890-897
Number of pages8
JournalMacromolecular Rapid Communications
Issue number10
Publication statusPublished - May 2015
Externally publishedYes


  • Albumin
  • polymer-protein conjugates
  • platinum drugs
  • micelles
  • nanoparticles

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