Determination of Hydrocortisone in Cosmetics by CdSe/CdS Quantum Dots-Based Fluoroimmunoassay Using Magnetic Fe3O4/Au Nanoparticles as Solid Carriers

2011 ◽  
Vol 29 (3) ◽  
pp. 587-591 ◽  
Author(s):  
Xiuling Wang ◽  
Lu Wei ◽  
Guanhong Tao ◽  
Long Dai
Keyword(s):  
Quantum Dots ◽  
Au Nanoparticles ◽  
Cds Quantum Dots ◽  
Magnetic Fe3o4

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

2012 ◽  
Vol 455-456 ◽  
pp. 1195-1199
Author(s):  
Yun Long Zeng ◽  
Xia Fei Li ◽  
Chun Ran Tang ◽  
Hao Wen Huang ◽  
Ya Jing Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Probe ◽  
Copper Ion ◽  
Water Soluble ◽  
Fluorescence Probes ◽  
Cds Quantum Dots ◽  
Buffer Solution ◽  
Green Protocol ◽  
Quenching Method

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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