General Information (more on wikipidia)

Species Molecular Weight (g/mol) Density (g/L) Radius (m) Reference
Rhodamine 6G MW D R [1]
Rhodamine B 442 D R [2]

Rhodamine is a family of related chemical compounds, fluorone dyes. Examples are Rhodamine 6G and Rhodamine B. They are used as a dye and as a dye laser gain medium. 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 measured easily and inexpensively with instruments called fluorimeters. Rhodamine dyes are used extensively in biotechnology applications such as fluorescence microscopy, flow cytometry and ELISA

Rhodamine dyes are generally toxic, and are soluble in water, methanol, and ethanol.

Rhodamine 6G or 590:

  • Diffusion of Rhodamine 6G in water:
    • Alone:
  • Diffusion of Rhodamine 6G in 50% sucrose solution:
    • Alone: $D = 39 \ \mu m^{2} s{-1}$ [1]

Rhodamine B or 610:

  • Diffusion of Rhodamine B in water:
    • Alone: $D~= 0.36 \times 10^{-9} m^{2}/s$ [2]
  • Diffusion of Rhodamine B in cellular matrix:
    • Alone in bioflim cell clusters: $D~= 0.37 \times 10^{-10} m^{2}/s$ [2]
1. ''CHARACTERIZATION OF A MEMS-FABRICATED MIXING DEVICE'', 2000 ASME International Mechanical Engineering Congress & Exposition, Orlando, Florida, November 5-10, 2000, pp.505-511
2. Rani, S.A., B. Pitts, and P.S. Stewart, Rapid Diffusion of Fluorescent Tracers into Staphylococcus epidermidis Biofilms Visualized by Time Lapse Microscopy. Antimicrob. Agents Chemother., 2005. 49(2): p. 728-732.
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