These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Polyethylenimine-capped silver nanoclusters as fluorescent sensors for the rapid detection of ellagic acid in cosmetics.
    Author: Hsu CC, Chao YY, Wang SW, Chen YL.
    Journal: Talanta; 2019 Nov 01; 204():484-490. PubMed ID: 31357323.
    Abstract:
    Polyethylenimine-capped silver nanoclusters (PEI-AgNCs) are being developed as fluorescent sensors because of their high fluorescence, excellent photostability and large Stokes shift. In this study, PEI-AgNCs demonstrate characteristic absorption peaks at 268 and 360 nm with the strongest blue fluorescence emission at 436 nm. The PEI-AgNCs are spherical, and their average diameter is 3.7 ± 1.8 nm. In addition, the quantum yield of the PEI-AgNCs is 3.03%. A sensitive, selective and rapid detection technique for ellagic acid has been developed utilizing a fluorescent PEI-AgNC sensor. Ellagic acid exhibits tyrosinase inhibition and antioxidative properties and is hence always added in cosmetics as a skin whitening ingredient. The reaction can be completed within 60 s in Britton-Robinson buffer at pH 11. The fluorescence quenching mechanism is assumed to be static quenching because the fluorescence lifetime of PEI-AgNCs without and with ellagic acid did not obviously change. Moreover, the quenching intensity of the PEI-AgNCs is linearly related to the ellagic acid concentration over the range from 0.1 μg/mL to 30.0 μg/mL with good linear correlation (r = 0.999), and the detection limit is 33.5 ng/mL. Finally, PEI-AgNCs have also been applied in the detection of a cosmetics containing ellagic acid.
    [Abstract] [Full Text] [Related] [New Search]