Understanding the Citric Acid–Urea Co–Directed Microwave Assisted Synthesis and Ferric Ion Modulation of Fluorescent Nitrogen Doped Carbon Dots: A Turn On Assay for Ascorbic Acid. Devi, J. S. A., Aparna, R. S., Aswathy, B., Nebu, J., Aswathy, A. O., & George, S. ChemistrySelect, 4(3):816–824, January, 2019. ![Understanding the Citric Acid–Urea Co–Directed Microwave Assisted Synthesis and Ferric Ion Modulation of Fluorescent Nitrogen Doped Carbon Dots: A Turn On Assay for Ascorbic Acid [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Abstract Herein, nitrogen doped carbon dots (NCDs) were synthesised from citric acid and urea via a previously reported microwave assisted route. The NCDs shows emission maximum at 500?nm on excitation at 400?nm. The fluorescence of NCDs decreases slightly with increase in basicity of solution up to pH?7.5 and then increases again after pH?8.5, along with a blue-shift in tested alkaline pH. This pH dependent blue-shift indicates the presence of both carboxyl?carboxylate and phenol?phenolate prototropic equilibrium in NCDs. Due to the special interaction of these phenolates and carboxylates on NCDs surface with di- or tri- valent heavy transition metal ions; it is demonstrated that ferric ion (Fe3+ ion) can quench the fluorescence of NCDs. This Fe3+ induced static quenching of NCDs is a collaborative effect of inner filter effect, aggregation and ferromagnetism. However, Ascorbic acid (AA) can recover the fluorescence of Fe3+ quenched NCD with detection limit as low as 96??M. This detection strategy has good selectivity towards AA over other antioxidants, saccharides, proteins and neurotransmitters. Furthermore, (spiked) human serum and (spiked) human urine were analysed and found good recovery percentage.
@article{devi_understanding_2019,
title = {Understanding the {Citric} {Acid}–{Urea} {Co}–{Directed} {Microwave} {Assisted} {Synthesis} and {Ferric} {Ion} {Modulation} of {Fluorescent} {Nitrogen} {Doped} {Carbon} {Dots}: {A} {Turn} {On} {Assay} for {Ascorbic} {Acid}},
volume = {4},
issn = {2365-6549},
shorttitle = {Understanding the {Citric} {Acid}–{Urea} {Co}–{Directed} {Microwave} {Assisted} {Synthesis} and {Ferric} {Ion} {Modulation} of {Fluorescent} {Nitrogen} {Doped} {Carbon} {Dots}},
url = {https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/slct.201803726},
doi = {10.1002/slct.201803726},
abstract = {Abstract Herein, nitrogen doped carbon dots (NCDs) were synthesised from citric acid and urea via a previously reported microwave assisted route. The NCDs shows emission maximum at 500?nm on excitation at 400?nm. The fluorescence of NCDs decreases slightly with increase in basicity of solution up to pH?7.5 and then increases again after pH?8.5, along with a blue-shift in tested alkaline pH. This pH dependent blue-shift indicates the presence of both carboxyl?carboxylate and phenol?phenolate prototropic equilibrium in NCDs. Due to the special interaction of these phenolates and carboxylates on NCDs surface with di- or tri- valent heavy transition metal ions; it is demonstrated that ferric ion (Fe3+ ion) can quench the fluorescence of NCDs. This Fe3+ induced static quenching of NCDs is a collaborative effect of inner filter effect, aggregation and ferromagnetism. However, Ascorbic acid (AA) can recover the fluorescence of Fe3+ quenched NCD with detection limit as low as 96??M. This detection strategy has good selectivity towards AA over other antioxidants, saccharides, proteins and neurotransmitters. Furthermore, (spiked) human serum and (spiked) human urine were analysed and found good recovery percentage.},
number = {3},
urldate = {2024-10-16},
journal = {ChemistrySelect},
author = {Devi, J. S. Anjali and Aparna, R. S. and Aswathy, B. and Nebu, John and Aswathy, A. O. and George, Sony},
month = jan,
year = {2019},
keywords = {Ascorbic Acid, Biosensor, Carbon Dots, Fluorescence, Inner Filter Effect, Iron(III)},
pages = {816--824},
}
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This pH dependent blue-shift indicates the presence of both carboxyl?carboxylate and phenol?phenolate prototropic equilibrium in NCDs. Due to the special interaction of these phenolates and carboxylates on NCDs surface with di- or tri- valent heavy transition metal ions; it is demonstrated that ferric ion (Fe3+ ion) can quench the fluorescence of NCDs. This Fe3+ induced static quenching of NCDs is a collaborative effect of inner filter effect, aggregation and ferromagnetism. However, Ascorbic acid (AA) can recover the fluorescence of Fe3+ quenched NCD with detection limit as low as 96??M. This detection strategy has good selectivity towards AA over other antioxidants, saccharides, proteins and neurotransmitters. 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