TrueBlack™ is a new reagent for quenching lipofuscin autofluorescence in tissue sections after immunofluorescence staining. Lipofuscin consists of highly autofluorescent granules of oxidized proteins and lipids that build up in the lysosomes of aging cells (1). Lipofuscin granules fluoresce brightly in all channels used for fluorescence microscopy, and accumulate in a wide variety of cell and tissue types with age. Consequently, imaging of specific immunofluorescence signal in adult human tissues or aged animal tissues can be virtually impossible unless methods are employed to quench or mask lipofuscin fluorescence. Traditionally, Sudan Black B has been used to quench lipofuscin autofluorescence by incubating tissue sections with the dye after immunofluorescence staining (2). However, while it masks the autofluorescence from lipofuscin, Sudan Black B also introduces uniform non-specific background fluorescence in the red and far-red channels (reference 3 and Figure 1 below), limiting the use of fluorescent dyes in those wavelengths. Now Biotium has developed TrueBlack™ as a superior alternative to Sudan Black B for elimination of lipofuscin fluorescence with minimal background fluorescence (Figure 1). TrueBlack™ treatment of immunostained tissues is rapid, simple, and has minimal effect on signal from fluorescent antibodies or nuclear counterstains, thus preserving the signal-to-noise ratio of the immunostaining (Figure 2). Note that TrueBlack is designed to quench autofluorescence caused by lipofuscin, it is not effective at reducing autofluorescence from other sources such as glutaraldehyde-induced fluorescence or endogenous fluorescence of collagen or elastin. Also see our other accessory products for immunofluorescence staining and other applications. Features:
Eliminates lipofuscin autofluorescence
Doesn’t cause high background like Sudan Black B
Clears the way for fluorescence imaging of human and aged animal tissues
1. Hohn, A. and Grune, T. Redox Biol 1(1): 140, 2013. 2. Schnell, S.A., Staines, W.A., and Wessendorf, M.W. J Histochem Cytochem 47(6): 719, 1999. 3. Romijn, H.J., van Uum, J.F.M., Breedijk, I., Emmering, J., Radu, I., and Pool, C.W. J Histochem Cytochem 47(2): 229, 1999.
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