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Texas Red-X, acid *CAS 199745-67-0*

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Physical properties
Molecular weight719.87
Spectral properties
Extinction coefficient (cm -1 M -1)116000
Excitation (nm)595
Emission (nm)613
Quantum yield0.971, 0.932
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


Molecular weight
Extinction coefficient (cm -1 M -1)
Excitation (nm)
Emission (nm)
Quantum yield
0.971, 0.932
Compared to Texas Red®, Texas Red-X dye that contains an additional seven-atom aminohexanoyl spacer ("X") between the fluorophore and the carboxy group. This spacer helps to separate the fluorophore from its point of attachment, potentially reducing the interaction of the fluorophore with the biomolecule to which it is conjugated. This product is a single 5-isomer, giving more reproducible results. It has the same spectral properties to Texas Red, and can be used to create bright red-fluorescent bioconjugates with excitation/emission maxima ~595/615 nm (Texas Red® is the trademark of ThermoFisher).


Common stock solution preparation

Table 1. Volume of DMF needed to reconstitute specific mass of Texas Red-X, acid *CAS 199745-67-0* to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

0.1 mg0.5 mg1 mg5 mg10 mg
1 mM138.914 µL694.57 µL1.389 mL6.946 mL13.891 mL
5 mM27.783 µL138.914 µL277.828 µL1.389 mL2.778 mL
10 mM13.891 µL69.457 µL138.914 µL694.57 µL1.389 mL

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Spectral properties

Extinction coefficient (cm -1 M -1)116000
Excitation (nm)595
Emission (nm)613
Quantum yield0.971, 0.932



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