Cellular Uptake of Fluorescent Labelled Biotin–Streptavidin Microspheres

Amino functionalized, cross-linked, polystyrene microspheres were covalently loaded with streptavidin to which was coupled fluorescently labeled biotin and biotinylated-tagged DNA. These biotin–streptavidin microsphere conjugates were then successfully delivered into cells. The application of the streptavidin–biotin technology to these microspheres allows the effective delivery of any biotinylated material into intact mammalian cells, without the need for delicate procedures such as micro-injection.

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