Permethylated-β-Cyclodextrin Capped CdTe Quantum Dot and its Sensitive Fluorescence Analysis of Malachite Green

Abstract

In the present work, the CdTe quantum dots were covalently conjugated with permethylated-β-cyclodextrin (OMe-β-CD) using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride as cross-linking reagent. The obtained functional quantum dots (OMe-β-CD/QDs) showed highly luminescent, water solubility and photostability as well as good inclusion ability to malachite green. A sensitive fluorescence method was developed for the analysis of malachite green in different samples. The good linearity was 2.0 × 10(-7)-1.0 × 10(-5) mol/L and the limit of detect was 1.7 × 10(-8) mol/L. The recoveries for three environmental water samples were 92.0-108.2 % with relative standard deviation (RSD) of 0.24-1.87 %, while the recovery for the fish sample was 94.3 % with RSD of 1.04 %. The results showed that the present method was sensitive and convenient to determine malachite green in complex samples. Graphical Abstract The analytical mechanism of OMe-β-CD/QDs and its linear response to MG.

CdTe/ZnS quantum dots as fluorescent probes for ammonium determination

“…Researchers have found that water-soluble QDs could be used as selective inorganic ion probes to determining CN À , H + , Ag + , Hg 2+ , Cu 2+ , Fe 2+ , Ni 2+ , Pb 2+ , Mn 2+ , Zn 2+ , and Co 2+ (22)(23)(24)(25)(26)(27). Interestingly, cationic dyes and surfactants can quench QDs extensively (28,29). Quenching results from variations in QD surface structures.…”