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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 12 — Apr. 20, 2004
  • pp: 2412–2417

Microfluorometric detection of catecholamines with multiphoton-excited fluorescence

J. Balaji, Chandra S. Reddy, S. K. Kaushalya, and Sudipta Maiti  »View Author Affiliations


Applied Optics, Vol. 43, Issue 12, pp. 2412-2417 (2004)
http://dx.doi.org/10.1364/AO.43.002412


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Abstract

We demonstrate sensitive spatially resolved detection of physiological chromophores that emit in the ultraviolet (<330 nm). An atypical laser source (a visible wavelength femtosecond optical parametric oscillator), and an unconventional collection geometry (a lensless detector that detects the forward-emitted fluorescence) enable this detection. We report the excitation spectra of the catecholamines dopamine and norepinephrine, together with near-UV emitters serotonin and tryptophan, in the range of 550–595 nm. We estimate the molecular two-photon action cross section of dopamine, norepinephrine, and serotonin to be 1.2 mGM (1 GM, or Goppert Mayor, is equal to 10-58 m4 s-1 photon-1), 2 mGM, and 43 mGM, respectively, at 560 nm. The sensitivity achieved by this method holds promise for the microscopic imaging of vesicular catecholamines in live cells.

© 2004 Optical Society of America

OCIS Codes
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(180.0180) Microscopy : Microscopy
(190.0190) Nonlinear optics : Nonlinear optics

History
Original Manuscript: August 22, 2003
Revised Manuscript: January 16, 2004
Published: April 20, 2004

Citation
J. Balaji, Chandra S. Reddy, S. K. Kaushalya, and Sudipta Maiti, "Microfluorometric detection of catecholamines with multiphoton-excited fluorescence," Appl. Opt. 43, 2412-2417 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-12-2412


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