Journal
FOOD CHEMISTRY
Volume 363, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2021.130325
Keywords
Fluorescence; Colorimetric; Ascorbic acid (AA); Au clusters; Living cells; Beverages
Funding
- National Natural Science Foundation of China [21305097]
- General Project of Education Department in Sichan [035Z2270]
- Two-Way Support Programs of Sichuan Agricultural University [00770113]
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A dual-signal assay using colorimetric and fluorescence techniques was developed for determining the concentration of ascorbic acid (AA). The method showed low detection limits for AA in the range of 0.5 to 200 μM and was successfully utilized for AA detection in living cells and beverages.
A colorimetric and fluorescence turn-on dual-signal assay was developed for the determination of ascorbic acid (AA). Because the ultraviolet absorption of the oxidized 3,3 ',5,5 '-tetramethylbenzidine (oxTMB) overlapped with the fluorescence emission of glutathione stabilized Au nanoclusters (AuNCs), the fluorescence of AuNCs can be quenched by oxTMB. When AA was added, the blue oxTMB was reduced to colorless TMB, and the fluorescence of AuNCs was restored simultaneously. The decrease in absorbance and increase in fluorescence signal depended on the concentration of AA. In the determination range of 0.5 to 200 mu M, the detection limits (LOD) for AA were as low as 0.15 mu M and 0.22 mu M for fluorometric and colorimetric, respectively. The established probe was used successfully for AA detection in living cells and beverages.
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