"Off-on" fluorescence probe based on green emissive carbon dots for the determination of Cu²⁺ ions and glyphosate and development of a smart sensing film for vegetable packaging.

ABSTRACT: An ultra-sensitive glyphosate nanosensor, based on carbon dots (CDs), was successfully developed with excellent long-wavelength emission (530 nm), a high quantum yield (41.3%), and an impressive detection limit (0.8 ng·mL^-1). This is the lowest value for glyphosate detection achieved by CD-based fluorescence analysis. The sensor was derived from a separate precursor, 1,4-dihydroxyanthraquinone, and was based on the "off-on" fluorescence analysis, where Cu²⁺ acts as a dynamic quencher and glyphosate as a fluorescence restorer (excitation wavelength 460 nm). Trace detection of glyphosate is possible with a wide detection range of 50-1300 ng·mL^-1 and spiked recoveries between 93.3 and 110.0%. Exploration in depth confirmed that (1) the fluorescence of CDs was

SUBMITTER: Wu J 

PROVIDER: S-EPMC8893061 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature