Journal
FOOD CHEMISTRY
Volume 390, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2022.133135
Keywords
Room temperatu r e phosphorescence; Carbon nitride quantum dots; Smartphone-based miniature device; Digital image colorimetry; Melamine
Funding
- National Natural Science Foundation of China [21707030]
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In this study, carbon nitride quantum dots (CNQDs) were embedded in a sodium carboxymethyl cellulose (CMC) matrix to form a CNQDs-CMC film, enabling rapid and quantitative detection of melamine (MEL) using a smartphone-based device. This technology provides a promising platform for on-site monitoring of analytes in complex matrices such as food safety, environmental screening, health monitoring, and disease prevention.
Carbon nitride quantum dots (CNQDs) were embedded in the sodium carboxymethyl cellulose (CMC) matrix to form CNQDs-CMC film to explore the room temperature phosphorescence (RTP) of CNQDs, which suppress the non-radiative relaxation process due to the internal hydrogen bonding interactions between CMC and CNQDs. Then, a simple, inexpensive, background-free miniature device integrating with CNQDs-CMC film and smartphone was fabricated for rapid and quantitative detection of melamine (MEL). In the present of MEL, the yellow RTP color of the CNQDs-CMC film was quenched and photographed by the smartphone. The Color Recognizer APP in the smartphone recognized the red (R) value for quantitative detection of MEL. Thus, digital image colorimetry (DIC) determination of MEL was achieved due to the visible RTP color change of CNQDs-CMC film. The smartphone-based miniature device provided a promising platform for the on-site monitoring analytes in the complex matrix including food safety, environmental screening, health monitoring, and disease prevention.
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