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Ursa Blue™

Ursa Blue™ is a cationic, highly water soluble fluorophore which can readily be excited from 300-400 nm, with emission ≈ 440 nm.
Ursa BlueUrsa Blue

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Sales price: $499.00

Description

Ursa Blue™ is a cationic, highly water soluble fluorophore which can readily be excited from 300-400 nm, with emission ≈ 440 nm. Ursa Blue™ readily binds electrostatically to colloidal silica nanoparticles allowing customers the choice of determining nanoparticle sizes using either steady-state or time resolved fluorescence analysis. In colloidal silica nanoparticle solutions, Ursa Blue™ shows triple exponential fluorescence decay with mean lifetimes of 16.1, 18.0 and 16.8 ns for DuPont’s SM30, AM30 and AS40 respectively.

Ursa Blue™ is sold dry and is simply reconstituted by adding water. One vial of Ursa Blue™ will typically allow for 10 nanoparticle metrology measurements to be undertaken, when further diluted into 3 cm3 volumes within a cuvette. 50 µL of methanol is typically added to each dry vial. Subsequently, ten 5 µL aliquots diluted to 3 cm3, typically give an optical density at 350 nm of ~0.1 OD.

For optimum performance, probe vials should be stored at -2 to -8 C when not being used. Probe solutions should be used after dilution.

For additional information please consult a recent paper that describes the use of Ursa Blue™ for silica Nanoparticle metrology.

An Ursa BioScience short video describes our reconstitution procedure.

Read more about Ursa BioScience's Anisotropy probes in the technology section.                                       Ursa Blue™ MSDS  material-safety-data-sheets-msdsthump