Journal
NANOMATERIALS
Volume 10, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/nano10101924
Keywords
Maillard reaction; carbon dots; L-tryptophan; D-glucose; pH dependence; Cr(VI) detection
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Funding
- National Key Research and Development Program of China [2018YFC1604204]
- Natural Science Foundation of Heilongjiang Province [LH2019C020]
- Harbin Science and Technology Innovation Talent Fund [2017RALXJ002]
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The Maillard reaction involves a series of complex reactions; fluorescent compounds have been considered as vital intermediate products of the reaction. In this article, carbon dots (CDs) based on the Maillard reaction (MR-CDs) were prepared with L-tryptophan and D-glucose, and they had excellent photoluminescence stability. MR-CDs showed stable pH-dependence behavior and exhibited an excellent linear response to pH in the range of 4.0-7.5 and 7.5-13.0, respectively. Under the masking effect of sodium fluoride for Fe(III), MR-CDs showed excellent selectivity and sensitivity for Cr (VI). The linear range of Cr(VI) was 0.2-50 mu M and the limit of detection was 20 nM. (S/N >= 3). Furthermore, MR-CDs were used to detect Cr(VI) in tap water samples. The recoveries were between 95.8% and 98.94%, and RSDs were less than 3.17%.
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