An ultrasensitive and selective method for the determination of Ceftriaxone using cysteine capped cadmium sulfide fluorescence quenched quantum dots as fluorescence probes

A simple A green protocol for synthesis of high quality, water-soluble and biocompatible CdS QDs have been developed in aqueous solution with amylum as stabilizing agent. The QDs were characterized by AMF and spectral methods. A fluorescence quenching method was developed for determination of iron (ΙΙΙ) with water soluble CdS quantum dots (QDs) as fluorescence probe. In pH 8.5 boric acid–borax buffer solution, the QDs show a high selective to ferric ion. The common cations, such as Ca2+, Mg2+, Zn2+, Fe2+ et al, have no effect on interference but copper ion. The fluorescence intensity of the QDs decreased linearly with the iron (QDs ) concentration in the range of 200 μM to 60 nM with a detection limit of 20 nM. It has been applied to determinate of iron in Angelica, Astragalus, Shouwu, ligusticum wallichii and radix rehmanniae recen.

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A novel method for iodate determination using cadmium sulfide quantum dots as fluorescence probes

Analytica Chimica Acta ◽

10.1016/j.aca.2010.08.034 ◽

2010 ◽

Vol 678 (2) ◽

pp. 203-207 ◽

Cited By ~ 48

Author(s):

Chun-Ran Tang ◽

Zhong-hua Su ◽

Bao-Gang Lin ◽

Hao-Wen Huang ◽

Yun-Long Zeng ◽

...

Keyword(s):

Quantum Dots ◽

Cadmium Sulfide ◽

Fluorescence Probes ◽

Novel Method

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Determination of Silver Ion with Cadmium Sulfide Quantum Dots Modified by Bismuthiol II as Fluorescence Probe

Annali di Chimica ◽

10.1002/adic.200690080 ◽

2007 ◽

Vol 97 (1-2) ◽

pp. 109-121 ◽

Cited By ~ 11

Author(s):

Shoujun Lai ◽

Xijun Chang ◽

Jie Mao ◽

Yunhui Zhai ◽

Ning Lian ◽

...

Keyword(s):

Quantum Dots ◽

Cadmium Sulfide ◽

Fluorescence Probe ◽

Silver Ion

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CdSe/ZnS Quantum Dots As a Fluorescence Probes For Determination of Vitamin B1

10.21203/rs.3.rs-824400/v1 ◽

2021 ◽

Author(s):

Reza Tirbandpaya ◽

Abdolraouf Samadi-Maybodi

Keyword(s):

Quantum Dots ◽

Limit Of Detection ◽

Vitamin B1 ◽

Fluorescence Probes ◽

Fast Method ◽

Excitonic Absorption ◽

Wet Chemical ◽

Excitonic Absorption Peak

Abstract This paper presents a new and fast method for determination of vitamin B1 (thiamine) using functionalized CdSe/ZnS quantum dots (QDs) as a sensor. In this study the core-shell CdSe/ZnS QDs with thioglycolic acid capping agents were synthesized by wet chemical method in aqueous solution. Electronic absorption was applied for size determination of the QDs, the average diameters of the synthesized quantum dots were calculated using wavelength of the first excitonic absorption peak. The methods of FESEM and FTIR were also used for characterization of the prepared samples. The results indicated that vitamin B1 could effectively quench the QDs emission and the fluorescence intensity decreased linearly with the concentration of vitamin B1 ranging from 10-7 to 10-4 molL−1 with limit of detection of 2×10-8 mol L−1. Determination of vitamin B1in pills from two pharmaceutical companies were used as real samples using this method .

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