Sulforhodamine 101

Sulforhodamine 101

Identifiers
CAS Number	60311-02-6
Beilstein Reference	3582548
Jmol 3D image	Interactive graph
PubChem	122180
SMILES [O-]S(C(C=C(S(O)(=O)=O)C=C1)=C1C2=C(C=C3C4=C5CCCN4CCC3)C5=[O+]C6=C(CCCN7CCC8)C7=C8C=C62)(=O)=O
Properties
Chemical formula	C31H30N2O7S2
Molar mass	606.71 g·mol^−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Sulforhodamine 101 (SR101) is a red fluorescent dye. In neurophysiological experiments which comprise calcium imaging methods, it can be used for a counterstaining of astrocytes to be able to analyze data from neurons separately.^[1] However, in addition to labeling astrocytes, SR101 labels myelinating oligodendrocytes.^[2] SR101 has been reported to affect excitability of neurons and should therefore be used with caution.^[3]

A sulfonyl chloride derivative of sulforhodamine 101, known as Texas Red, is used for conjugation to a number of functional groups, especially primary amines.

References

1. Nimmerjahn, A.; Kirchhoff, F.; Kerr, J.N.; Helmchen, F. (2004). "Sulforhodamine 101 as a specific marker of astroglia in the neocortex in vivo". Nature Methods 1 (1): 31–7. doi:10.1038/nmeth706. PMID 15782150.
2. Hill, R.A.; Grutzendler, J. (2014). "In vivo imaging of oligodendrocytes with sulforhodamine 101". Nature Methods 11 (11): 1081–1082. doi:10.1038/nmeth.3140. PMID 25357236.
3. Kang, J.; Kang N.; Yu, Y.; Zhang, J.; et al. (2010). "Sulforhodamine 101 induces long-tem potentiation of intrinsic excitability and synaptic efficacy in hippocampal CA1 pyramidal neurons". Neuroscience 169 (4): 1601–1609. doi:10.1016/j.neuroscience.2010.06.020. PMID 2918738.