Red pitaya peels-based carbon dots for real-time fluorometric and colorimetric assay of Au3+, cellular imaging, and antioxidant activity.

Analytical and Bioanalytical Chemistry
Ying GuoShuyun Shi

Abstract

The synthesis of fascinating multifunctional carbon dots (CDs) attracted immense attention. Here, a facile solvothermal treatment of red pitaya peels in acetic acid produced CDs (designated as ACDs, excitation/emission wavelengths at 357/432 nm). ACDs with high sp2-hybridized carbon and carboxylic group contents can rapidly and selectively reduce Au3+ to Au0, and stabilize produced Au nanoparticles (AuNPs). The synergetic effect of electron transfer from ACDs to Au3+ and inner filter effect (IFE) from ACDs to AuNPs quenches the fluorescence within 30 s. Simultaneously, the resulting AuNPs have a purple color with a maximum absorption at 545 nm for visual detection. Therefore, for the first time, we reported a fluorometric and colorimetric dual-mode sensing system for real-time, highly sensitive and selective detection of Au3+. The fluorescence quenching ratio and absorbance change linearly with the increase of Au3+ concentration in the range of 0.3-8.0 μM and 3.3-60.0 μM with limits of detection (LODs) at 0.072 μM and 2.2 μM, respectively. The assay was applied for Au3+ determination in spiked real water samples with recoveries from 95.5 to 105.0%, and relative standard deviation (RSD) of less than 6.5%. Furthermore, ACDs with ...Continue Reading

References

Apr 27, 2007·Analytical Chemistry·Wolfgang HaissDavid G Fernig
Oct 10, 2015·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Mohammad AmjadiTooba Hallaj
Feb 23, 2020·Analytical and Bioanalytical Chemistry·Wang LiYibing Ji
Mar 7, 2020·Advances in Colloid and Interface Science·Umairah Abd RaniEbrahim Mahmoudi
May 8, 2020·Journal of Food Biochemistry·Monica Joshi, Bala Prabhakar

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