Pyranine is a hydrophilic, pH

PH

In chemistry, pH is a measure of the acidity or basicity of an aqueous solution. Pure water is said to be neutral, with a pH close to 7.0 at . Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline...

-sensitive fluorescent dye from the group of chemicals known as arylsulfonates. Pyranine is soluble in water and has applications as a coloring agent, biological stain, optical detecting reagent, and a pH indicator

PH indicator

A pH indicator is a halochromic chemical compound that is added in small amounts to a solution so that the pH of the solution can be determined visually. Hence a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model. Normally, the indicator causes the...

. One example would be the measurement of intracellular pH

Intracellular pH

All cells contain an intracellular fluid whose pH value is known as the intracellular pH . The pHi plays a critical role in the function of the cell, and close regulation is required for cells to survive...

. Pyranine is also found in highlighter

Highlighter

A highlighter is a felt-tip pen which is used to draw attention to sections of documents by marking them with a vivid, translucent colour.A typical highlighter is fluorescent yellow, coloured with pyranine.-History:...

s and soap

Soap

In chemistry, soap is a salt of a fatty acid.IUPAC. "" Compendium of Chemical Terminology, 2nd ed. . Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford . XML on-line corrected version: created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN...

s.

External links

• CTD's Pyranine page from the Comparative Toxicogenomics Database
  Comparative Toxicogenomics Database
  The Comparative Toxicogenomics Database is a public website and research tool that curates scientific data describing relationships between chemicals, genes, and human diseases....