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Reversible Detection and Quantification of Hydrogen Sulfide by Fluorescence Using the Hemoglobin I from Lucina pectinata.
ACS Sensors 2018 October 27
A new detection system for the endogenous gaseous transmitter and environmental pollutant hydrogen sulfide is presented. It is based on the modulation of the fluorescence spectrum of a coumarin dye by the absorption spectrum of the recombinant hemoglobin I from clam Lucina pectinata upon coordination of the analyte. While we establish that the reported affinity of rHbI for H2 S has been overestimated, the association of the protein with an appropriate fluorophore allows fast, easy, and reversible detection and quantification of hydrogen sulfide in buffer as well as biological fluids such as human plasma, with a quantification limit around 200 nM at pH 7.4.
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