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• W3167164767 abstract "Abstract Fluorescence probes have widely been used for detecting and imaging Ca 2+ ‐enriched parts of cells but more rarely for quantitative determination of concentrations. In this study we show how this can be achieved by a novel approach using hydrogel particles. In a microfluidic co‐flow arrangement spherical droplets were generated from an aqueous solution of acrylamide, N,N '‐methylenebisacrylamide crosslinker and photoinitiator and subsequently photo‐cured in situ yielding gel particles in a sub millimeter range. These particles were separated, dried under reduced pressure and re‐swollen in water containing Rhod‐5N tri potassium salt as calcium ion selective fluorescence probe. After that the particles were dried again and stored for further investigations. Upon exposure of dried particles to calcium chloride solutions they swell and take up Ca 2+ ‐ions forming a strong fluorescing complex with Rhod‐5N. Thus, fluorescence intensity increases with calcium ion concentration. Up to ca. 0.50 mM the enhancement effect is strong and then becomes considerably weaker. The intensity‐concentration‐dependence is well described by an equation derived from the equilibrium of the formation of a 1:1 Ca 2+ :Rhod‐5N complex. The particles allow for a fast optical determination of Ca 2+ ‐concentrations up to 0.50 mM in analyte volumes down to below 10 μL." @default.
• W3167164767 created "2021-06-22" @default.
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• W3167164767 date "2021-06-04" @default.
• W3167164767 modified "2023-10-17" @default.
• W3167164767 title "Micro flow photochemical synthesis of Ca‐sensitive fluorescent sensor particles" @default.
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• W3167164767 doi "https://doi.org/10.1002/elsc.202100023" @default.
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