Multiple release kinetics of targeted drug from gold nanorod embedded polyelectrolyte conjugates induced by near-infrared laser irradiation

Tsung Rong Kuo, Vladimir A. Hovhannisyan, Yu Ching Chao, Shu Ling Chao, Shu Jen Chiang, Sung Jan Lin, Chen Yuan Dong, Chia Chun Chen

Research output: Contribution to journalArticle

96 Citations (Scopus)


The conjugates of gold nanorods and the model drug, fluorescein isothiocyanate (FITC), embedded inside polyelectrolytes (GNRs/FITC@PLE) were synthesized to study the release kinetics of FITC under femtosecond near-infrared (NIR) laser irradiation. The optical and structural properties of GNRs/FITC@PLE conjugates before and after laser treatments were examined using UV-vis spectroscopy, confocal microscopy, and transmission electron microscopy (TEM). The release of FITC from the conjugates was induced by the heat generated from gold nanorods under laser irradiation. The concentration of released FITC was measured as the time of continuous and periodic laser irradiation was varied. Within 5 min of the laser exposure, the release rates of FITC exhibited zero-order and first-order kinetics under continuous and periodic irradiation, respectively. Furthermore, a drug release system was designed based on the conjugates of gold nanorods and the anticancer drug, paclitaxel (PTX), embedded inside polyelectrolytes (GNRs/PTX@PLE). The conjugates were applied for in vitro studies with breast cancer cells. The release of PTX from the conjugates was triggered by NIR laser irradiation, and the inhibition rates of the cells showed strong dependencies on the irradiation modes and time. The results suggested that the multiple releases of PTX from the conjugates can be controlled by laser irradiation within a long period of time. Our system holds great potential for future therapeutic applications on breast cancers.

Original languageEnglish
Pages (from-to)14163-14171
Number of pages9
JournalJournal of the American Chemical Society
Issue number40
Publication statusPublished - Oct 13 2010
Externally publishedYes


ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this