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Overview
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Fura 2 was developed to improve the fluorescent properties of Quin 2. The signal intensity in 1 mM of loaded Fura 2 corresponds to that of 30 mM of loaded Quin 2. This allows an experiment at a lower concentration of indicator using Fura 2 instead of Quin 2. Fura 2 is one of the most widely used calcium indicators for ratiometric measurement. Many types of instrumentation are now available for experiments using Fura 2, but Fura 2 is especially suitable for digital imaging microscopy. It is less susceptible to photobleaching than Indo 1. Changes in the cell shape can sometimes affect the fluorescent ratio at 340 nm and 380 nm. For example, fluorescent signal intensities at these wavelengths sometimes decrease simultaneously with smooth muscle contraction. For blood vessels, however, the increase of the signal intensity at 340 nm tends to be smaller on contraction, while the decrease of the signal intensity at 380 nm tends to be larger with its contraction. Fura 2-AM is an acetoxymethyl ester derivative of Fura 2 that can be easily loaded into cells by incubation.
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- Properties
- Applications
- Reference
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Overview