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Carbon Dots - Europe PMC

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Last Updated: 02 January 2023

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Metal-organic framework with dual-loading of nickel/nitrogen-doped carbon dots and magnetic nanoparticles for fluorescence detection of fenitrothion in food samples

The development of precise methods for the adherence assay of organophosphate toxin, fenitrothion, is of utmost importance in minimizing human life and the environment. A magnetic fluorimetric nanosensor for fenitrothion was made herein by embedding the nickel and nitrogen-doped carbon dots and Fe2084 nanoparticles with Fe-2083Ou2084 nanoparticles into the zeolitic imidazolate framework-8. The manufactured nanosensor combines the advantages of Fe2083Ou2084 nanoparticles and ZIF-8 with increased sensitivity of Ni,N-carbon dots, delivering the desired nanosensor. By the electron transfer reaction step, we found that the fluorescence signal of the ZIF-based nanocomposite was dynamically quenched by fenitrothion.

Source link: https://europepmc.org/article/MED/IND607921229


A Robust Switchable Oil-In-Water Emulsion Stabilized by Electrostatic Repulsions between Surfactant and Similarly Charged Carbon Dots.

One of the key questions for scientists working in colloidal systems is how to monitor the stability of oil-in-water emulsions. Carbon dots have earned a lot of attention recently as smart materials due to their dependable physicochemical stability and versatile applications. In the formulated emulsion, the cationic surfactant molecules are adsorbed at the oil and water interface to reduce interfacial tension and increase the drops with a positive charge to encourage vigorous electrostatic repulsions among them. On the contrary, cationic CDs are included in the droplets' water phase to reduce the water secrecy and prevent flocculation and droplet coalescence.

Source link: https://europepmc.org/article/MED/36581561


Effect of precursor molecular structure on the facile synthesis of efficient red-emissive two-photon carbon dots: real-time cellular imaging and high-resolution deep-tissue imaging

The creation of carbon dot-based fluorescent nanoparticles for bioimaging applications has captured the interest of the scientific community in recent years. In the development of red-emissive carbon dots, our comprehensive review of the effects of synthesis parameters on carbon dots' photophysical and physicochemical characteristics demonstrated the importance of precursor selection and analysis of the biophysical and physicochemical structure. The present research reveals the great potential of D-CD as an effective bioimaging agent for cell culture, long-term and real-time cellular imaging, and high-resolution deep tissue imaging in complex biological systems.

Source link: https://europepmc.org/article/PPR/PPR589793


Energy-efficient Preparation of Amino and Sulfhydryl Functionalized Biomass Carbon Dots via a Reverse Microemulsion for Specific Recognition of Fe 3+ and L-cysteine.

Following the adsorption of Fe 3+ on the surfaces of BCDs-NH 2 and BCDs-SH, the fluorescence responses were reduced step by step, while adding L-Cys to the BCDs-NH 2 /Fe 3+ system restored the fluorescence. BCDs-NH2 and BCDs-SH methods demonstrated remarkably low detection rates for Fe 3+ of 3. 2 and 3. 8 nM, respectively, within a broad linear range from 0. 006-200 u03bcM and 0. 004-200 bcM, respectively. BCDs-NH2/Fe 3+ systems were used as an optosensor for L-Cys in the concentration ranges of 0. 08-30 and 30-1000 nM with a detection threshold of 65 nM. The BCDs-NH 2+ and BCDs-BH 2+ systems were also able to respond to Fe 3+ in water samples, ranging from 87. 3% to 98. 8%, respectively.

Source link: https://europepmc.org/article/MED/36580202


Near-Infrared Blinking Carbon Dots Designed for Quantitative Nanoscopy.

Blinking carbon dots have piqued curiosity as a tool for single molecule localization microscopy, but quantitative analysis has been limited due to inept blinking and low signal-to-noise ratios. The NIR-CDs enable conversion to monovalent antibody fragments for labeling and imaging of cellular receptors, as well as yield increases of 52% in SNR and 33% over visible CDs. We demonstrate oligomerization and internalization of programmed cell death-ligand 1 by a small molecule inhibitor for checkpoint blockade using NIR-CDs-based SMLM.

Source link: https://europepmc.org/article/MED/36579734


Synthesis, characterization and potential sensing application of carbon dots synthesized via the hydrothermal treatment of cow milk.

In this research, carbon quantum dots were synthesized by hydrothermically treating cow milk. When they were first produced and had an average size of 7 nm, they were practically circular. Because luminescence quenching methods are sensitive to and selective for Sn 2+, they can be used to build a nanosensor for detection Sn 2+.

Source link: https://europepmc.org/article/MED/36577768


Rapid One-Pot Microwave Assisted Green Synthesis Nitrogen Doped Carbon Quantum Dots as Fluorescent Precursor for Estimation of Modafinil as Post-Covid Neurological Drug in Human Plasma with Greenness Assessments.

MODAFINL, a neuro-stimulant anti-narcoleptic drug, is used to treat neurological disorders caused by COVID-19. Mod was used to treat narcolepsy, shift-work sleep disorder, and obstructive sleep apnea-related sleepiness. The quantity yield of the synthesized N@CQDs was found to be 41. 3 percent after a 4 minute reaction. Typical Range 50 - 700 ng mL -1 with a lower limit of quantitation equal to 45. 00 ng mL -1.

Source link: https://europepmc.org/article/MED/36576682


One-Step Colloidal Synthesis of Non-Toxic Electroactive Carbon Dots with a Better Threshold Cytotoxicity and Cytocompatibility.

The cytocompatibility and cell uptake of CDs in human mesenchymal stem cells are both dependent on the type of functionalization and concomitantly on the type of precursors. At a 488 nm excitation and were found to be agglomerated when internalized in hMSCs, the type II CDs, synthesized using citric acid and deionized water, have agglomeration-free appearance. Type III CDs have a wide range of particle sizes, wide emission bandwagon range of 280-700 nm, threshold toxicity of 1 mg/mL, and excellent cytocompatibility with hMSCs, much better than those in the published studies. When compared to commercial graphene quantum dots, the as-synthesized type III CDs have increased electrical conductivity and cytocompatibility in a given dosage.

Source link: https://europepmc.org/article/MED/36576301


Computer chip-inspired design of nanocellulose/carbon dots hydrogel as superior intensifier of nano-sized photocatalyst for effective Cr(VI) removal.

Adsorption and photocatalysis experiments demonstrated superior removal results of the NCH containing STN, as shown by a theoretical maximum adsorption capacity of 425. 74 mg/g and a kinetic constant of 0. 0374 min-1 in the photocatalytic process, which was nearly 6. 6 and 7. 3 times of STN.

Source link: https://europepmc.org/article/MED/36586334


Surfactant-mediated mobility of carbon dots in saturated soil: comparison between anionic and cationic surfactants.

Understanding the mobility, retention, and fate of carbon dots is crucial for risk analysis of this new carbon material. The CDs' transport in water-saturated soil was tested by column experiments to investigate the different effects of an anionic surfactant, sodium dodecylbenzene sulfonate, and a cationic surfactant, cetylmethylammonium bromide. Interestingly, SDBS suppressed CDs' mobility in the divalent cation field electrolytes, whereas CTAB had the opposite effect. SDBS' transport-inhibited effect was primarily due to anionic surfactant precipitation with metal cations and the emergence of adsorbed SDBS-Cu 2+ /Ca 2+ complexes. The improved effect of CTAB resulted from the CTAB coating on soil grains, which reduced the cation bridging between CDs and soil, which decreased the cation bridging between CDs and soil. Surprisingly, CTAB could decrease CDs' mobility at pH 9. 0, owing to the binding cationic surfactant's strong hydrophobicity property on the soil surface.

Source link: https://europepmc.org/article/MED/36572776

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions