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Microfluorometric detection of catecholamines with multiphoton-excited fluorescence
J Balaji1, Chandra S Reddy, S K Kaushalya
1Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba Mumbai 400005, India.
Applied Optics
|May 4, 2004
Summary
This study presents a new method for sensitive detection of ultraviolet-emitting physiological molecules. The technique utilizes a unique laser and detection setup, paving the way for live cell imaging of important compounds.
Area of Science:
- Biophysics
- Chemical Physics
- Molecular Imaging
Background:
- Physiological chromophores emitting in the ultraviolet (<330 nm) are crucial biomarkers.
- Sensitive detection of these molecules is essential for understanding cellular processes.
- Current methods may lack the required spatial resolution or sensitivity for live-cell imaging.
Purpose of the Study:
- To develop a sensitive, spatially resolved detection method for ultraviolet-emitting physiological chromophores.
- To characterize the two-photon excitation properties of key catecholamines and related compounds.
- To assess the potential for microscopic imaging of vesicular catecholamines in live cells.
Main Methods:
- Utilized an atypical visible wavelength femtosecond optical parametric oscillator laser source.
- Employed an unconventional lensless detector for forward-emitted fluorescence collection.
- Recorded excitation spectra for dopamine, norepinephrine, serotonin, and tryptophan in the 550-595 nm range.
Main Results:
- Achieved sensitive, spatially resolved detection of ultraviolet-emitting physiological chromophores.
- Reported excitation spectra for dopamine, norepinephrine, serotonin, and tryptophan.
- Estimated molecular two-photon action cross-sections for dopamine (1.2 mGM), norepinephrine (2 mGM), and serotonin (43 mGM) at 560 nm.
Conclusions:
- The developed method offers high sensitivity for detecting physiological chromophores.
- The technique shows promise for the microscopic imaging of vesicular catecholamines in live cells.
- This advancement could significantly impact cellular neuroscience and related fields.