Switch on fluorescence mode for determination of <scp>l</scp>-cysteine with carbon quantum dots and Au nanoparticles as a probe

Chen, Yuye; Xiu, Qin; Yuan, Chunling; Wang, Yilin

doi:10.1039/c9ra09019c

Cited by 20 publications

(3 citation statements)

References 35 publications

(37 reference statements)

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“…Modification of l -Cys is confirmed by the Fourier transform-infrared (FT-IR) spectrum. As reported in previous studies, FT-IR peaks at 1386 and 1598 cm –1 represent the symmetric and asymmetric stretching of the −COO group . In addition, the peak at 2073 cm –1 is attributed to the bending vibration of the N–H bond, and the peak at 3433 cm –1 corresponds to the stretching of the OH – group .…”

Section: Resultssupporting

confidence: 68%

“…As reported in previous studies, FT-IR peaks at 1386 and 1598 cm −1 represent the symmetric and asymmetric stretching of the −COO group. 39 In addition, the peak at 2073 cm −1 is attributed to the bending vibration of the N−H bond, and the peak at 3433 cm −1 corresponds to the stretching of the OH − group. 40 The relevant peaks are evidently shown in Figure 1C, suggesting the presence of L-Cys on the surface of QDs.…”

Section: Methodsmentioning

confidence: 99%

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Formation of a Photoelectrochemical Z-Scheme Structure with Inorganic/Organic Hybrid Materials for Evaluation of Receptor Protein Expression on the Membrane of Cancer Cells

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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Quantitative analysis of receptor protein expression is essential to give new insights into tumor-related research. Benefitting from their high sensitivity and low background, photoelectrochemical (PEC) platforms are considered as powerful tools for evaluating the expression of receptor proteins. Herein, to reduce the cytotoxicity and facilitate the subsequent assembly, l-cysteine-modified Ag–ZnIn2S4 quantum dots (l-Cys AZIS QDs) are prepared and PEC responses under the irradiation of long wavelength light are obtained. To further improve the PEC behavior, iron phthalocyanine (FePc) is employed to form a Z-scheme structure with l-Cys AZIS QDs. The Z-scheme structure based on l-Cys AZIS QDs/FePc hybrid materials exhibits high photo-to-electric conversion efficiency and can be excited with near-infrared range light. Because hyaluronic acid linked to photoactive materials can recognize CD44 expressed on the membrane of cancer cells, cancer cells are immobilized onto l-Cys AZIS QDs/FePc hybrid materials, inducing a decrease of the photocurrent intensity. Consequently, a PEC cytosensor is constructed to quantify cancer cells expressing CD44. The PEC analytical platform is able to determine A549 cells in the range of 2 × 102 to 4.5 × 106 cells/mL, and a detection limit of 15 cells/mL is realized in the case of S/N = 3. In addition, the expression of CD44 in A549 and other five cancer cells is measured with this PEC method. Depending on our data, the expression of CD44 in different cancer cells is distinct, indicating great potential of this method in receptor protein-related studies.

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Section: Resultssupporting

confidence: 68%

Section: Methodsmentioning

confidence: 99%

Formation of a Photoelectrochemical Z-Scheme Structure with Inorganic/Organic Hybrid Materials for Evaluation of Receptor Protein Expression on the Membrane of Cancer Cells

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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“…Inspired by the progress achieved in the synthesis of CDs, researches have recently begun to exploit their novel properties for targeted applications by tuning and designing the structures of the surface group and/or carbon core [25,26]. Two representative strategies, i.e., surface functionalization and elemental doping, have been employed frequently to achieve the aforementioned goals [27][28][29]. As the research progresses, the application range of CDs is expanding more widely based on various surface functionalization and doping techniques, e.g., sensors, drug delivery, solar cells, catalysis, and lubricant additives [30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Tribological performance of various metal-doped carbon dots as water-based lubricant additives and their potential application as additives of poly(ethylene glycol)

Tang

Zhu

2021

Friction

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Advances in nano-lubricant additives are vital to the pursuit of energy efficiency and sustainable development. Carbon dots (CDs) have been widely investigated in the domain of lubricant additives owing to their extraordinary tribological properties, in particular, their friction-reducing and anti-wear properties. Metal-doped CDs are a new type of CDs, and their friction-reducing and anti-wear properties are attracting increasing attention. Therefore, a series of CDs doped with various divalent metal ions have been successfully synthesized via one-pot pyrolysis. The tribological properties of the synthesized CDs as water-based lubricant additives are in the following order: Zn-CDs > Cu-CDs ≫ Mg-CDs > Fe-CDs > U-CDs. Specifically, adding 1.0 wt% of Zn-CDs into water-based lubricant results in 62.5% friction and 81.8% wear reduction. Meanwhile, the load-carrying capacity of the water-based lubricant increases from 120 N to at least 500 N. Zn-CDs as an additive have long service life. Additionally, anion-tuned Zn-CDs fabricated via anion exchange exhibit promise as lubricant additives for poly(ethylene glycol). Based on the results of wear scar surface analyses, it is discovered that tribochemical films, primarily composed of iron oxides, nitrides, metal carbonates, zinc oxides, zinc carbonates, organic compounds, and embedded carbon cores, formed on the rubbing surfaces with a thickness of approximately 270 nm when Zn-CDs are used as additives. This film combined with the “ball-bearing” and third-particle effects of Zn-CDs contributed to excellent lubrication performance.

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Polymer Electrochemiluminescence Featuring Thermally Activated Delayed Fluorescence

Huang

Zhang

et al. 2021

ChemPhysChem

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Electrochemiluminescence (ECL) based on conjugated polymers or oligomers is persistently being pursued owing to its huge application scope ranging from ultra-sensitive bioanalysis to ultra-resolution imaging and spectroscopy. Because of the theoretical limit in radiative exciton generation yield (typicallỹ 25 %) of those polymers or oligomers, the corresponding ECL efficiency is still limited, which hampers its ECL performance and its related applications. Herein, we report ECL based on a thermally activated delayed fluorescence (TADF) polymer scaffold, which is characteristic of all-exciton harvesting in the ECL process, and thus potentially capable of achieving~100 % ECL efficiency. These desired properties of the TADF polymer ECL is attributed to a fast and efficient up-conversion process from non-radiative triplet to radiative singlet states under thermal activation, which is absent in conventional fluorescent polymers/oligomers, such as F8BT. In this study, various ECL modes, including annihilation or co-reactant mode using TPrA or S 2 O 8 2À as co-reactant, are confirmed for our model TADF polymer ECL system, which was different from fluorescent polymer ECL counterpart. Furthermore, solid-state ECL sensing on L-cysteine (an important marker of disease) is also evaluated by using the model TADF polymer. Ultralow detection limit in combination with high sensitivity and good specificity are achieved for this model system, indicative of a high potential of the TADF polymer scaffold for applications in the broad field of ECL.

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Switch on fluorescence mode for determination of l-cysteine with carbon quantum dots and Au nanoparticles as a probe

Abstract: We demonstrated a fluorescence probe composed of CQDs and AuNPs for switch on detection of Cys, where CQDs as fluorescence reporters and AuNPs as fluorescence quenchers were chosen.

Cited by 20 publications

References 35 publications

Formation of a Photoelectrochemical Z-Scheme Structure with Inorganic/Organic Hybrid Materials for Evaluation of Receptor Protein Expression on the Membrane of Cancer Cells

Formation of a Photoelectrochemical Z-Scheme Structure with Inorganic/Organic Hybrid Materials for Evaluation of Receptor Protein Expression on the Membrane of Cancer Cells

Tribological performance of various metal-doped carbon dots as water-based lubricant additives and their potential application as additives of poly(ethylene glycol)

Polymer Electrochemiluminescence Featuring Thermally Activated Delayed Fluorescence

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