Inheritance of physico-chemical properties and ROS generation by carbon quantum dots derived from pyrolytically carbonized bacterial sources

Wu, Yanyan; Wei, Hao; Mei, Henny C. van der; Vries, J. de; Busscher, Henk J.; Ren, Yijin

doi:10.1016/j.mtbio.2021.100151

Cited by 8 publications

(11 citation statements)

References 52 publications

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“…This indicates that the mesoporous silica layer is the main contributing factor to the porosity of the shells. Additional attachment of bacterially-derived CQDs did not yield significant blocking of the pores, because the CQDs had considerably smaller diameters (2–3 nm) [ 15 ] than the pores.…”

Section: Resultsmentioning

confidence: 99%

“…Bacterially-derived CQDs were synthesized, as described before [ 15 ]. Briefly, bacterial pellets of L. acidophilus or E. coli suspension were heated in ceramic crucibles at a rate of 5 °C min −1 to 220 °C and kept for 2 h at 220 °C.…”

Section: Methodsmentioning

confidence: 99%

“…Finally, CQDs suspended in water were collected by freeze-drying. Quantum yields of thus derived CQDs were shown by analysis of their integrated fluorescence intensity as a function of absorbance, to be 1.0% and 1.5% relative to quinine sulfate for L. acidophilus and E. coli , respectively [ 15 ].…”

Section: Methodsmentioning

confidence: 99%

“…Carbon quantum dots (CQDs) are nanoparticles with extremely small size that can be derived from carbonization of suitable carbon sources, amongst which bacteria. Recently it has been shown that CQDs synthesized by pyrolytic carbonization of bacteria at intermediate temperatures between 200 °C and 220 °C inherit amide groups and nitrogen hetero-atoms from their source bacteria [ 15 ]. This chemical inheritance was accompanied by more extensive generation of ROS.…”

Section: Introductionmentioning

confidence: 99%

“…This chemical inheritance was accompanied by more extensive generation of ROS. CQDs derived from bacteria exhibited up to 100-fold higher generation of ROS than their source bacteria due to hetero-atoms in CQDs that increase free electron incorporation in carbon dots and therewith ROS generation [ 15 ]. Based on these observations, we here forward the hypothesis that attachment of CQDs derived from bacteria to a passive, protective surface-engineered shell may actively enhance the functionality of encapsulated, probiotic bacteria while maximally maintaining viability of the encapsulated bacteria.…”

Section: Introductionmentioning

confidence: 99%

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Activation of a passive, mesoporous silica nanoparticle layer through attachment of bacterially-derived carbon-quantum-dots for protection and functional enhancement of probiotics

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Activation of a passive, mesoporous silica nanoparticle layer through attachment of bacterially-derived carbon-quantum-dots for protection and functional enhancement of probiotics

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Carbon quantum dots for efficient hydrogen production: A critical review

Sharma,

Kafle,

Singh

et al. 2024

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Fluorescent carbon nanoparticles, also known as carbon quantum dots (CQDs), have piqued the interest of researchers due to their numerous uses in chemical sensing, biomedical imaging, nanotechnology, photovoltaics, LEDs, and hydrogen generation. Aside from their optical brilliance, CQDs have benefits like low toxicity, environmental friendliness, cost‐effectiveness, and ease of manufacture, with adjustable properties via surface passivation and functionalization. This review article goes over CQDs in depth, addressing synthesis advances, benefits, limits, various synthesis processes, and prospective hydrogen generation applications. While CQDs have photocatalytic properties, they confront a few challenges, including low quantum yields, spectrum limitations, photostability limitations, limited catalytic activity, scaling difficulties, and environmental issues. Thorough research is required to use CQDs in sustainable hydrogen generation. Despite obstacles, CQD research remains appealing, with transformational promise for a cleaner and more sustainable energy future through controlled synthesis approaches displaying CQDs' many uses.

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Efficient Synthesis of Highly Photo‐stable N‐doped Carbon Quantum Dots and their Applications in Detection and Cellular Imaging of Mercury Ions

Yin

Sun

et al. 2022

ChemistrySelect

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In this work, the nitrogen doped carbon quantum dots (N‐CQDs) were synthesized by a simple microwave hydrothermal method using citric acid (carbon source) and urea (dopant) and optimized the preparation conditions by orthogonal tests. The synthesized N‐CQDs emitted a bright blue fluorescence with specific selectivity for Hg2+. The study revealed a static quenching mechanism of Hg2+ on the N‐CQDs. The N‐CQDs showed good linear correlation in the range of 0–120 μM for the detection of Hg2+ with a low detection limit of 22.50 nM. We also demonstrated the suitability of the N‐CQDs for the detection of Hg2+ in tap water and industrial wastewater with spiked recoveries of 97.56 %–103.58 %. In addition, the synthesized N‐CQDs with high fluorescence intensity, good optical stability and biocompatibility were successfully applied to fluorescent inks and imaging of Hela cells. This indicated that the synthesized N‐CQDs have promising applications in Hg2+ detection, bioimaging, and fluorescence anti‐counterfeiting.

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Inheritance of physico-chemical properties and ROS generation by carbon quantum dots derived from pyrolytically carbonized bacterial sources

Cited by 8 publications

References 52 publications

Activation of a passive, mesoporous silica nanoparticle layer through attachment of bacterially-derived carbon-quantum-dots for protection and functional enhancement of probiotics

Activation of a passive, mesoporous silica nanoparticle layer through attachment of bacterially-derived carbon-quantum-dots for protection and functional enhancement of probiotics

Carbon quantum dots for efficient hydrogen production: A critical review

Efficient Synthesis of Highly Photo‐stable N‐doped Carbon Quantum Dots and their Applications in Detection and Cellular Imaging of Mercury Ions

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