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Journal Article
Research Support, N.I.H., Extramural
Long wavelength fluorescence lifetime standards for front-face fluorometry.
Journal of Fluorescence 2010 March
With the increased development and use of fluorescence lifetime-based sensors, fiber optic sensors, fluorescence lifetime imaging microscopy (FLIM), and plate and array readers, , calibration standards are essential to ensure the proper function of these devices and accurate results. For many devices that utilize a "front face excitation" geometry where the excitation is nearly coaxial with the direction of emission, scattering-based lifetime standards are problematic and fluorescent lifetime standards are necessary. As more long wavelength (red and near-infrared) fluorophores are used to avoid background autofluorescence, the lack of lifetime standards in this wavelength range has only become more apparent . We describe an approach to developing lifetime standards in any wavelength range, based on Förster resonance energy transfer (FRET). These standards are bright, highly reproducible, have a broad decrease in observed lifetime, and an emission wavelength in the red to near infrared making them well suited for the laboratory and field applications as well. This basic approach can be extended to produce lifetime standards for other wavelength regimes.
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