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A new class of rhodamines for the application as indicator dyes in fluorescent pH sensors is presented. Their pH-sensitivity derives from photoinduced electron transfer between non-protonated amino groups and the excited chromophore which results in effective fluorescence quenching at increasing pH. The new indicator class carries a pentafluorophenyl group at the 9-position of the xanthene core where...
Magnetic optical sensor particles were prepared using a mini-emulsion solvent evaporation (MESE) technique. The resulting nanoparticles (NPs) have diameters around 100 nm and relatively narrow size distribution (PDI < 0.2). Incorporation of probes for oxygen or pH resulted in magnetic sensor particles for bioprocess monitoring and imaging applications. The MESE technique yields sensing NPs in higher...
An optical sensor platform based on (ferro)magnetic sensor macrospheres (MagSeMacs) was established. In contrast to existing technologies such sensors can be magnetically controlled. A simple coating procedure enables technology transfer from conventional sensor patches to MagSeMacs. Oxygen and pH sensitive spheres were prepared and their sensor characteristics were investigated. The benefits of magnetic...
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