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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 5, Iss. 8 — Aug. 1, 2014
  • pp: 2726–2735

Measurements of extrinsic fluorescence in Intralipid and polystyrene microspheres

Vinh Nguyen Du Le, Zhaojun Nie, Joseph E. Hayward, Thomas J. Farrell, and Qiyin Fang  »View Author Affiliations


Biomedical Optics Express, Vol. 5, Issue 8, pp. 2726-2735 (2014)
http://dx.doi.org/10.1364/BOE.5.002726


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Abstract

The fluorescence of Intralipid and polystyrene microspheres with sphere diameter of 1 µm at a representative lipid and microsphere concentration for simulation of mucosal tissue scattering has not been a subject of extensive experimental study. In order to elucidate the quantitative relationship between lipid and microsphere concentration and the respective fluorescent intensity, the extrinsic fluorescence spectra between 360 nm and 650 nm (step size of 5 nm) were measured at different lipid concentrations (from 0.25% to 5%) and different microsphere concentrations (0.00364, 0.0073, 0.0131 spheres per cubic micrometer) using laser excitation at 355 nm with pulse energy of 2.8 µJ. Current findings indicated that Intralipid has a broadband emission between 360 and 650 nm with a primary peak at 500 nm and a secondary peak at 450 nm while polystyrene microspheres have a single peak at 500 nm. In addition, for similar scattering properties the fluorescence of Intralipid solutions is approximately three-fold stronger than that of the microsphere solutions. Furthermore, Intralipid phantoms with lipid concentrations ~2% (simulating the bottom layer of mucosa) produce up to seven times stronger fluorescent emission than phantoms with lipid concentration ~0.25% (simulating the top layer of mucosa). The fluoresence decays of Intralipid and microsphere solutions were also recorded for estimation of fluorescence lifetime.

© 2014 Optical Society of America

OCIS Codes
(170.3650) Medical optics and biotechnology : Lifetime-based sensing
(170.6280) Medical optics and biotechnology : Spectroscopy, fluorescence and luminescence

ToC Category:
Calibration, Validation and Phantom Studies

History
Original Manuscript: March 5, 2014
Revised Manuscript: May 27, 2014
Manuscript Accepted: July 16, 2014
Published: July 22, 2014

Citation
Vinh Nguyen Du Le, Zhaojun Nie, Joseph E. Hayward, Thomas J. Farrell, and Qiyin Fang, "Measurements of extrinsic fluorescence in Intralipid and polystyrene microspheres," Biomed. Opt. Express 5, 2726-2735 (2014)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-5-8-2726


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