8-Hydroxypyrene-1,3,6-Trisulfonic Acid Trisodium Salt

Pyranine has a wide range of applications due to its fluorescent properties:

• Biological Staining: Used for staining cells and tissues in microscopy.
• pH Indicator: Commonly employed in biochemical assays to monitor pH levels.
• Optical Detection: Utilized in various optical sensors for detecting changes in environmental conditions.
• Highlighters: Found in highlighter pens, where it provides bright yellow-green fluorescence under UV light.

Pyranine's biological activity is primarily linked to its role as a pH-sensitive fluorescent indicator. It is widely used in cellular studies to monitor intracellular pH changes due to its ability to provide real-time fluorescence readouts. The compound's pKa values vary depending on the medium, typically reported around 7.3 but influenced by factors such as ionic strength and the presence of other solutes. This variability can lead to artifacts in pH measurement if not properly accounted for.

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