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Sulforhodamine 101, sodium salt
Sulforhodamine 101 is a fluorescence reference standard for measuring fluorescence quantum yield. It is also the key precursor used for preparing rhodamine 101 sulfonyl chloride (also called Texas Red®, a trademark of Molecular Probes). This sulforhodamine 101 sodium salt is more water-soluble than the neutral sulforhodamine 101.
Chemical structure for Sulforhodamine 101, sodium salt
Chemical structure for Sulforhodamine 101, sodium salt
CatalogSize
Price
Quantity
7125 mg
Price
 
Physical properties

Molecular weight628.69
SolventWater
Spectral properties

Absorbance (nm)573
Correction factor (260 nm)0.24
Correction factor (280 nm)0.21
Extinction coefficient (cm -1 M -1)
139000
Excitation (nm)578
Emission (nm)593
Storage, safety and handling

H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22
StorageFreeze (< -15 °C); Minimize light exposure
UNSPSC12171501
CAS465544-24-5
Instrument settings

Fluorescence microplate reader
Excitation586 nm
Emission605 nm
Cutoff590 nm
Recommended plateSolid black
Instrument specification(s)TRITC filterset
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Page updated on October 13, 2025