Abstract
A natural isorhamnetin-based fluorescent sensor for highly sensitive and selective detection of copper ions had been studied. The fluorescent sensor isorhamnetin (Iso) after binding to Cu2+ ions in pH 7.40 buffer solution generated quenching in fluorescent emission intensity. The binding constant value was obtained 1.79×106. The sensor Iso can be applied to the quantification of Cu2+ ion with a linear range of 1.0×10−8–1.9×10−6molL−1, the detection limit of 4.0×10−9molL−1, and the reproducibility of the sensor is good. The sensor showed high selectivity toward Cu2+. As a result, the isorhamnetin fluorescent sensor was successfully applied for determination of Cu2+ in rivers, lakes, vegetables and fruits with good recovery.
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