Sulforhodamine B

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Sulforhodamine B
Sulforhodamine B
CAS number 3520-42-1 YesY
PubChem 65191
ChemSpider 58690 YesY
EC number 220-025-2
Jmol-3D images Image 1
Molecular formula C27H30N2O7S2
Molar mass 558.666 g/mol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Sulforhodamine B or kiton red (C27H30N2O7S2) is a fluorescent dye with uses spanning from laser-induced fluorescence (LIF) to the quantification of cellular proteins of cultured cells. The red, solid, water-soluble dye is primarily used as a polar tracer.

The dye has maximal absorbance at 565 nm light and maximal fluorescence emission at 585 nm light. It does not exhibit pH dependent absorption or fluorescence over the range of 3 to 10.[1]


  1. ^ Coppeta, Rogers; Rogers, C. (1998). "Dual Emission Laser Induced Fluorescence for Direct Planar Scalar Behavior Measurements". Experiments in Fluids 25: 1–15;. doi:10.1007/s003480050202.