TY - JOUR
T1 - Old silver mirror in qualitative analysis with new shoots in quantification
T2 - Nitrogen-doped carbon dots (N-CDs) as fluorescent probes for “off-on” sensing of formalin in food samples
AU - Naksen, Puttaraksa
AU - Jarujamrus, Purim
AU - Anutrasakda, Wipark
AU - Promarak, Vinich
AU - Zhang, Liyuan
AU - Shen, Wei
N1 - Funding Information:
This work is also supported by the National Research Council of Thailand ( IRN/502/2563 ) chaired by Assoc. Prof. Dr. Duangjai Nacapricha. The research scholarships of the Ubon Ratchathani University.
Funding Information:
The research scholarships and instrumental facility of the Department of Chemistry, Faculty of Science, Ubon Ratchathani University, are gratefully acknowledged. Science Achievement Scholarship of Thailand (SAST) given to Puttaraksa Naksen is also gratefully acknowledged. The Center of Excellence for Innovation in Chemistry (PERCH-CIC), Ministry of Higher Education, Science, Research and Innovation is also gratefully acknowledged.
Funding Information:
This work is also supported by the National Research Council of Thailand (IRN/502/2563) chaired by Assoc. Prof. Dr. Duangjai Nacapricha. The research scholarships of the Ubon Ratchathani University.
Publisher Copyright:
© 2021 Elsevier B.V.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2022/1/1
Y1 - 2022/1/1
N2 - A novel fluorometric assay for selective and sensitive determination of formalin (FA) was developed based on nitrogen-doped carbon dots (N-CDs) coupled with silver mirror reaction. N-CDs was synthesized using the hydrothermal method with the ethylene glycol and ammonia solution as carbon and nitrogen precursors, respectively. The detection principle was based on “off-on” fluorescence switching. Specifically, the fluorescence signal of N-CDs was first turned off after incorporating the Ag+ and Tollens’ reagents. Then, in the presence of FA, the Ag+ species on the N-CDs surface were reduced to Ag0 species and the fluorescence signal of N-CDs was switched back on. The fluorescence intensity due to the N-CDs signal linearly increased with the increasing FA concentrations in the range of 5–100 mg L−1, with the detection limit of 1.5 mg L−1. The proposed approach provides rapid, simple, sensitive, and selective detection of FA in various food samples.
AB - A novel fluorometric assay for selective and sensitive determination of formalin (FA) was developed based on nitrogen-doped carbon dots (N-CDs) coupled with silver mirror reaction. N-CDs was synthesized using the hydrothermal method with the ethylene glycol and ammonia solution as carbon and nitrogen precursors, respectively. The detection principle was based on “off-on” fluorescence switching. Specifically, the fluorescence signal of N-CDs was first turned off after incorporating the Ag+ and Tollens’ reagents. Then, in the presence of FA, the Ag+ species on the N-CDs surface were reduced to Ag0 species and the fluorescence signal of N-CDs was switched back on. The fluorescence intensity due to the N-CDs signal linearly increased with the increasing FA concentrations in the range of 5–100 mg L−1, with the detection limit of 1.5 mg L−1. The proposed approach provides rapid, simple, sensitive, and selective detection of FA in various food samples.
KW - Fluorometric assay
KW - Formalin (FA)
KW - Nitrogen-doped carbon dots (N-CDs)
KW - Silver mirror reaction
KW - Tollens' reagent
UR - http://www.scopus.com/inward/record.url?scp=85114793445&partnerID=8YFLogxK
U2 - 10.1016/j.talanta.2021.122862
DO - 10.1016/j.talanta.2021.122862
M3 - Article
C2 - 34635244
AN - SCOPUS:85114793445
SN - 0039-9140
VL - 236
JO - Talanta
JF - Talanta
M1 - 122862
ER -