title: Quantum dot based probing of mannitol: an implication in clinical diagnostics.
abstract: We demonstrate that mannitol, an important diuretic, can be determined with cysteine-capped CdS quantum dots (QDs) using optical spectroscopy. Unique luminescence enhancement of QDs was observed on interaction with mannitol. The binding between QDs and mannitol was monitored by UV-vis, Fourier transform infra-red and Raman spectroscopy. The binding constant was determined following the Langmuir binding isotherm. A quantitative correlation between mannitol concentration and PL enhancement of CdS QDs has been established. We also observed that possible interfering agents, such as, urea, uric acid, creatinine, some metal ions, glucose, sorbitol or sucrose had no significant effect on luminescence of CdS QDs. The proposed strategy can be a very fast, simple and potential tool for the monitoring of diuretics and assaying intestinal permeability.
authors.affiliation: UGC-DAE Consortium for Scientific Research, Kolkata Centre, III/LB-8 Bidhannagar, Kolkata 700098, India.
authors.forename: Debasmita
authors.initials: D
authors.lastname: Ghosh
authors.forename: Srabanti
authors.initials: S
authors.lastname: Ghosh
authors.forename: Abhijit
authors.initials: A
authors.lastname: Saha