|Jmol-3D images||Image 1|
|Appearance||red to violet powder|
|Melting point||210–211 °C (Decomposes)|
|Solubility in water||~50 g/L|
| (what is: / ?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Rhodamine B // is a chemical compound and a dye. It is often used as a tracer dye within water to determine the rate and direction of flow and transport. Rhodamine dyes fluoresce and can thus be detected easily and inexpensively with instruments called fluorometers. Rhodamine dyes are used extensively in biotechnology applications such as fluorescence microscopy, flow cytometry, fluorescence correlation spectroscopy and ELISA.
Rhodamine B is tunable around 610 nm when used as a laser dye. Its luminescence quantum yield is 0.65 in basic ethanol, 0.49 in ethanol, 1.0, and 0.68 in 94% ethanol. The fluorescence yield is temperature dependent.
The solubility of Rhodamine B in water is ~50 g/L. However, the solubility in acetic acid solution (30 vol.%) is ~400 g/L. Chlorinated tap water decomposes rhodamine B. Rhodamine B solutions adsorb to plastics and should be kept in glass.
Rhodamine B is being tested for use as a biomarker in oral rabies vaccines for wildlife, such as raccoons, to identify animals that have eaten a vaccine bait. The rhodamine is incorporated into the animal's whiskers and teeth.
It is also often mixed with herbicides to show where they have been used.
Rhodamine B (BV10) is mixed with Quinacridone Magenta (PR122) to make the bright pink watercolor known as Opera Rose.
Safety and health
In California, Rhodamine B is suspected to be carcinogenic and thus products containing it must contain a warning on its label.
In New Jersey, MSDS files state that there is limited evidence of carcinogenicity in laboratory animal, and no evidence at all in humans.
- Rhodamine B
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- Karstens, T.; Kobs, K. (1980). "Rhodamine B and rhodamine 101 as reference substances for fluorescence quantum yield measurements". The Journal of Physical Chemistry 84 (14): 1871–1872. doi:10.1021/j100451a030.
- Detection and prevention of leaks from dams By Antonio Plata Bedmar and Luís Araguás Araguás, Taylor & Francis, 2002, ISBN 90-5809-355-7
- Slate, Dennis; Algeo, Timothy P.; Nelson, Kathleen M.; Chipman, Richard B.; Donovan, Dennis; Blanton, Jesse D.; Niezgoda, Michael; Rupprecht, Charles E. (2009). "Oral Rabies Vaccination in North America: Opportunities, Complexities, and Challenges". In Bethony, Jeffrey M. PLoS Neglected Tropical Diseases 3 (12): e549. doi:10.1371/journal.pntd.0000549. PMC 2791170. PMID 20027214.
- Naval Jelly msds with Rhodamine B
- J. T. Baker Rhodamine B MSDS