1. ZnCdSe-CdTe quantum dots: A "turn-off" fluorescent probe for the detection of multiple adulterants in an herbal honey.
- Author
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Xu, Lu, Lu, Daowang, Shi, Qiong, Chen, Hengye, Xie, Shunping, Li, Gangfeng, Fu, Hai-Yan, and She, Yuan-Bin
- Subjects
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QUANTUM dots , *FLUORESCENT probes , *HIGH-fructose corn syrup , *ADULTERATIONS , *HONEY , *FOOD chemistry , *LEAST squares - Abstract
To enhance the power of untargeted detection, a "turn-off" fluorescent probe with double quantum dots (QDs) was developed and coupled with chemometrics for rapid detection of multiple adulterants in an herbal (Rhus chinensis Mill., RCM) honey. The double water-soluble ZnCdSe-CdTe QDs have two separate and strong fluorescent peaks, which can be quenched by honey and extraneous adulterants with varying degrees. Class models of pure RCM honey samples collected from 6 different producing areas (n = 122) were developed using one-class partial least squares (OCPLS). Four extraneous adulterants, including glucose syrup, sucrose syrup, fructose syrup, and glucose-fructose syrup were added to pure honey samples at the levels of 0.5% to 10% (w/w). As a result, the OCPLS model using the second-order derivative (D2) spectra could detect 1.0% (w/w) of different syrups in RCM honey, with a sensitivity of 0.949. The double water-soluble QDs, which can be adjusted for analysis of other water-soluble food samples, has largely extended the capability of traditional fluorescence and will provide a potentially more sensitive and specific analysis method for food frauds. Unlabelled Image • A fluorescent probe of double quantum dots was used for analysis of honey frauds. • Untargeted detection of multiple sugar syrups was performed using chemometrics. • The method is highly sensitive and the lowest detected doping level was 1.0%. • The double quantum dots are water-soluble and useful for many other food systems. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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