Nanoassembled capsules as delivery vehicles for large payloads of high relaxivity Gd3+ agents

Sally E. Plush, Mark Woods, You Fu Zhou, Shyam B. Kadali, Michael S. Wong, A. Dean Sherry

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


Nanoassembled capsules (NACs) that incorporate a polymer aggregate inside a silica shell may be loaded with agents that are of particular interest for therapeutic or diagnostic applications. NACs formed using the MRI contrast agent GdDOTP5- in the internal polymer aggregate are reported herein, the smaller of which show promise as potential MRI contrast agents. Unlike many other nanoencapsulated systems, water access to the inner core of these NACs does not appear to be limited and consequently the water relaxivity per Gd 3+ agent can reach as high as 24 mM-1 s-1. Robust, spherical capsules were formed using polyallylamine or poly-L-lysine ranging from 0.2 to 5 μm in diameter. The greatest gains in relaxivity were observed for smaller NACs, for which water accessibility remained high but molecular rotation of the Gd3+ chelate was effectively restricted. Larger NACs did not afford such large gains in relaxivity, the result of poorer water accessibility combined with less-effective rotational restriction.

Original languageEnglish (US)
Pages (from-to)15918-15923
Number of pages6
JournalJournal of the American Chemical Society
Issue number43
StatePublished - Nov 4 2009

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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