Determination of Trace Iron in Chinese Herbal Medicine Using CdS Quantum Dots as Fluorescence Probes

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 455-456)
• Pages: 1195-1199
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.455-456.1195
• Online since: January 2012
• Authors: Yun Long Zeng, Xia Fei Li, Chun Ran Tang, Hao Wen Huang, Ya Jing Wang, Zhong Hua Su, Huan Zhao, Ya Mei Hu, Jin Li
• Keywords: Amylum Modified CdS Quantum Dots, Chinese Herbal Medicine, Fluorescence Probe, Quantum Dot (QD), Trace Iron

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