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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 17 — Aug. 21, 2006
  • pp: 7776–7788

Fluorescence quenching by polystyrene microspheres in UV-visible and NIR tissue-simulating phantoms

Karthik Vishwanath, Wei Zhong, Melanie Close, and Mary-Ann Mycek  »View Author Affiliations


Optics Express, Vol. 14, Issue 17, pp. 7776-7788 (2006)
http://dx.doi.org/10.1364/OE.14.007776


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Abstract

Tissue-simulating phantoms are widely used for controlled studies of photon transport in turbid media. Here, we describe how polystyrene microspheres, which are often used to simulate optical scattering in such phantoms, can reduce fluorophore quantum yield via collisional quenching. We report studies on UV-visible (fluorescein-based) and NIR (IR125-based) phantoms with differing fluorophore and scatterer concentrations, as well as differing microsphere sizes. Results consistent with the Stern-Volmer relation suggest that the fluorophore intrinsic excited-state lifetime decreased due to collisional quenching from polystyrene microspheres and that the quenching efficiency was dependent on the concentration ratio of fluorophores to microspheres. Lifetime decreases ranging from 10–35% (20%) were measured for fluorescein-based (IR 125-based) phantoms. Since polystyrene microspheres are commonly used in tissue-simulating phantoms for quantitative studies of fluorescence light propagation, their quenching effects on fluorescence intensities may be difficult to separate from intensity losses attributed to optical absorption and scattering in the phantom unless fluorescence lifetime measurements are performed simultaneously.

© 2006 Optical Society of America

OCIS Codes
(170.3650) Medical optics and biotechnology : Lifetime-based sensing
(170.7050) Medical optics and biotechnology : Turbid media

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: June 9, 2006
Revised Manuscript: July 28, 2006
Manuscript Accepted: August 1, 2006
Published: August 21, 2006

Virtual Issues
Vol. 1, Iss. 9 Virtual Journal for Biomedical Optics

Citation
Karthik Vishwanath, Wei Zhong, Melanie Close, and Mary-Ann Mycek, "Fluorescence quenching by polystyrene microspheres in UV-visible and NIR tissue-simulating phantoms," Opt. Express 14, 7776-7788 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-17-7776


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