Photoluminescent carbon dots derived from sugarcane molasses: synthesis, properties, and applications

Huang, Guohong; Chen, Xing; Wang, Wenwen; Zheng, Huajun; Huang, Zuqiang; Chen, Dong; Xie, Hao

doi:10.1039/c7ra09002a

Cited by 121 publications

(55 citation statements)

References 41 publications

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“…In the spectrum, lower cutoff wavelengths for the CQDs were observed at 235 and 332 nm. Absorption of the CQDs was attributed to the π–π * transition of aromatic C=C bonds and the n–π * transition of surface functional groups such as C=O . A broad peak at 332 nm in the visible absorption spectrum of the CQDs appeared due to trapping of large amounts of excitation energy, leading to huge amounts of emission at 365 nm excitation and indicated that the prepared CQDs were fluorescent .…”

Section: Resultsmentioning

confidence: 99%

Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

et al. 2019

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A facile and eco‐friendly hydrothermal method was used to prepare carbon quantum dots (CQDs) using orange waste peels. The synthesized CQDs were well dispersed and the average diameter was 2.9 ± 0.5 nm. Functional group identification of the CQDs was confirmed by Fourier transform infrared spectrum analysis. Fluorescence properties of the synthesized CQDs exhibited blue emission. The fluorescence quantum yield of the CQDs was around 11.37% at an excitation wavelength of 330 nm. The higher order nonlinear optical properties were examined using a Z‐scan technique and a continuous wave laser that was operated at a wavelength of 532 nm. Results demonstrated that the synthesis of CQDs can be considered as promising for optical switching devices, bio‐scanning, and bio‐imaging for optoelectronic applications.

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Section: Resultsmentioning

confidence: 99%

Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

et al. 2019

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“…CDots are small carbon nanoparticles of an average diameter of ,10 nm that are functionalized with organic molecules such as those containing amino groups for effective surface passivation. 5 Due to their biocompatibility and low toxicity in vitro and in vivo, CDots have been widely pursued for a broad range of promising biological applications, including biosensors, gene transmission, drug delivery, and fluorescence labeling. 6 It is known that the optical absorption of CDots is associated with π-plasmon transitions in the core carbon nanoparticles of the dots, while the fluorescence emissions over the visible to near-infrared spectral region are attributed to photogenerated electrons and holes trapped at diverse surface sites and their associated radiative recombinations.…”

Section: Introductionmentioning

confidence: 99%

Synergistic photoactivated antimicrobial effects of carbon dots combined with dye photosensitizers

Dong¹,

Bond²,

Pan³

et al. 2018

IJN

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BackgroundCarbon quantum dots (CDots) have recently been reported as a new class of visible light activated antimicrobial nanomaterials. This study reports the synergistic photoactivated antimicrobial interactions of CDots with photosensitizers on bacterial cells.MethodsThe antimicrobial effects of the CDots with surface passivation molecules 2,2′-(ethylenedioxy)bis(ethylamine) in combination with photosensitizer methylene blue (MB) or toluidine blue (TB) at various concentrations were evaluated against Escherichia coli cells with and without 1-hour visible light illumination. The broth microdilution checkerboard method and isobologram analysis were used for determining if synergistic effect existed between CDots and MB or TB.ResultsThe results showed that CDots alone at a concentration of 5 μg/mL did not display antimicrobial effects, 1 μg/mL MB alone only decreased 1.86 log of viable cell numbers, but the combination treatment with 5 μg/mL CDots combined with 1 μg/mL MB completely inhibited bacteria growth, resulted in 6.2 log viable cell number reduction, suggesting synergistic interaction between the two. The antimicrobial effects of CDots/TB combination exhibited similarly synergistic effects on E. coli cells. These synergistic effects between CDots and MB or TB were further confirmed using the checkerboard microdilution methods, where the fractional inhibitory concentration index value (0.5) and the isobologram analyses. The synergistic interactions were also correlated to the increased generation of intracellular reactive oxygen species in E. coli cells upon the combination treatments of CDots/MB or CDots/TB.ConclusionThe study demonstrated the synergistic photoactivated antimicrobial effects of CDots in combination with other photosensitizers. Such synergistic effect may open new strategies for developing highly effective antimicrobial methods.

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“…The same authors showed promising biocompatibility properties of fluorescent CDs conjugated with hyperbranched polyglycerol, which had improved performances in terms of RBCs morphology and hemolysis respect to bare unmodified CDs [117]. Minimum RBC toxicity and negligible hemolytic effect were confirmed by different experimental in vitro studies with CDs at concentration up to 2.0 mg/mL [118,119], while only slight effects were observed on the α-helix structure of BSA following incubation with CDs derived from sugarcane molasses [119]. An in vivo toxicology testing showed normal values for the hematology parameters, including white blood cells, red blood cells, hemoglobin concentration, and platelet count following CDs injection in female Balb/c mice over 90 days [17].…”

Section: Carbon Dotsmentioning

confidence: 84%

Hemocompatibility of Carbon Nanostructures

Fedel

2020

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Carbon nanostructures (CNs), such as carbon nanotubes, fullerenes, carbon dots, nanodiamonds as well as graphene and its derivatives present a tremendous potential for various biomedical applications, ranging from sensing to drug delivery and gene therapy, biomedical imaging and tissue engineering. Since most of these applications encompass blood contact or intravenous injection, hemocompatibility is a critical aspect that must be carefully considered to take advantage of CN exceptional characteristics while allowing their safe use. This review discusses the hemocompatibility of different classes of CNs with the purpose of providing biomaterial scientists with a comprehensive vision of the interactions between CNs and blood components. The various complex mechanisms involved in blood compatibility, including coagulation, hemolysis, as well as the activation of complement, platelets, and leukocytes will be considered. Special attention will be paid to the role of CN size, structure, and surface properties in the formation of the protein corona and in the processes that drive blood response. The aim of this review is to emphasize the importance of hemocompatibility for CNs intended for biomedical applications and to provide some valuable insights for the development of new generation particles with improved performance and safety in the physiological environment.

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Photoluminescent carbon dots derived from sugarcane molasses: synthesis, properties, and applications

Abstract: Photoluminescent carbon dots derived from sugarcane molasses were investigated via cellular imaging and sensing for Fe3+ or sunset yellow. The underlying mechanism of fluorescence quenching in the C-dots/sunset yellow system was also studied.

Cited by 121 publications

References 41 publications

Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

Facile preparation of high fluorescent carbon quantum dots from orange waste peels for nonlinear optical applications

Synergistic photoactivated antimicrobial effects of carbon dots combined with dye photosensitizers

Hemocompatibility of Carbon Nanostructures

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