scholarly journals Spectrofluorimetric Determination of Hydrochlorothiazide by a Carbon Dots-Based Probe via Inner Filtering Effect and Resonance Rayleigh Scattering

2022 ◽  
Author(s):  
Ali Ghafarloo ◽  
Reza Sabzi ◽  
Naser Samadi ◽  
Hamed Hamishehkar
Keyword(s):  
Carbon Dots ◽  
Rayleigh Scattering ◽  
Limit Of Detection ◽  
Fluorescent Sensor ◽  
Emission Spectra ◽  
Cost Effective ◽  
Inner Filter Effect ◽  
Resonance Rayleigh Scattering ◽  
Excitation Spectra ◽  
One Pot

Synthesis of carbon dots (CDs) from natural resources not only enables green synthesis and production of environmentally friendly materials, but also provides a cost-effective probe as a fluorescence nanosensor. The proposed sensor introduces a unique one-pot hydrothermal CDs synthesis from alfalfa leaves, which is promising for sensing hydrochlorothiazide (HCTZ) via inner filter effect (IFE) and resonance Rayleigh scattering (RRS). The as-prepared CDs had wide emission spectra, excitation-dependent emission, high solubility, high stability, and visible fluorescence light with a quantum yield of up to 11%. The absorption of HCTZ overlapped with the excitation spectra of CDs. Therefore, CDs represented excellent quenching due to IFE when HCTZ was gradually added. Furthermore, this fluorescent sensor was successfully used to quantify HCTZ in the linear ranges (0.17-2.50 μg mL-1) with the limit of detection of 0.11 μg mL-1. The sensing system was simple as no surface functionalization was required for CDs, leading to less laborious steps and more cost-effective synthesis. The reaction time was short, i.e., less than 2 min, indicating a simple approach for rapid analysis of HCTZ. By optimizing conditions, successful measurements were carried out on pharmaceutical tablets.

scholarly journals One-Pot Hydrothermal Synthesis of Carbon Dots as Fluorescent Probes for the Determination of Mercuric and Hypochlorite Ions

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1831
Author(s):  
Hsin Lee ◽  
Yen-Chang Su ◽  
Hsiang-Hao Tang ◽  
Yu-Sheng Lee ◽  
Jan-Yee Lee ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Fluorescent Probes ◽  
Carbon Dots ◽  
Limit Of Detection ◽  
Tap Water ◽  
Fluorescence Emission ◽  
Emission Spectra ◽  
Excitation Wavelength ◽  
One Pot ◽  
Fluorescence Emission Spectra

Nitrogen and sulfur codoped carbon dots (NSCDs) were synthesized via a one-pot hydrothermal method, and citric acid, ethylenediamine, and methyl blue were used as precursors. The obtained NSCDs were spherical with an average size of 1.86 nm. The fluorescence emission spectra of the NSCDs were excitation independent and emitted blue fluorescence at 440 nm with an excitation wavelength at 350 nm. The quantum yield of the NSCDs was calculated to be 68.0%. The NSCDs could be constructed as fluorescent probes for highly selective and sensitive sensing mercuric (Hg2+) and hypochlorite (ClO−) ions. As the addition of Hg2+ or ClO− ions to the NSCDs, the fluorescence intensity was effectively quenched due to dynamic quenching. Under the optimal conditions, the linear response of the fluorescence intensity ranged from 0.7 μM to 15 μM with a detection limit of 0.54 μM and from 0.3 μM to 5.0 μM with a limit of detection of 0.29 μM for Hg2+ and ClO− ions, respectively. Finally, the proposed method was successfully used for quantifying Hg2+ and ClO− ions in spiked tap water samples.

A green synthetic route for the surface-passivation of carbon dots as an effective multifunctional fluorescent sensor for the recognition and detection of toxic metal ions from aqueous solution

2019 ◽  
Vol 11 (4) ◽  
pp. 490-506 ◽  
Author(s):  
K. Radhakrishnan ◽  
P. Panneerselvam ◽  
M. Marieeswaran
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Carbon Dots ◽  
Surface Passivation ◽  
Fluorescent Sensor ◽  
Toxic Metal ◽  
Carbon Quantum Dots ◽  
Synthetic Route ◽  
One Pot ◽  
Hydrothermal Methods

In this work, a green synthetic route was used to create a number of surface passivated fluorescent carbon quantum dots, which are explored as promising sensing probes, via facile one-pot hydrothermal methods.

A reliable and facile fluorescent sensor from carbon dots for sensing 2,4,6-trinitrophenol based on inner filter effect

2020 ◽  
Vol 720 ◽  
pp. 137680 ◽  
Author(s):  
Xin Wang ◽  
Yongli Liu ◽  
Qingxiang Zhou ◽  
Xueying Sheng ◽  
Yi Sun ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Fluorescent Sensor ◽  
Inner Filter Effect ◽  
Filter Effect

Efficient one-pot synthesis of carbon dots as a fluorescent probe for the selective and sensitive detection of rifampicin based on the inner filter effect

2018 ◽  
Vol 10 (33) ◽  
pp. 4085-4093 ◽  
Author(s):  
Zhu Han ◽  
Yuwei Long ◽  
Shuang Pan ◽  
Hui Liu ◽  
Jidong Yang ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Carbon Dots ◽  
Low Cost ◽  
Ammonium Thiocyanate ◽  
Inner Filter Effect ◽  
Ammonium Citrate ◽  
Blue Fluorescence ◽  
One Pot ◽  
One Pot Synthesis ◽  
Hydrothermal Approach

In this paper, carbon dots (CDs) emitting blue fluorescence were prepared using ammonium citrate and ammonium thiocyanate through a low-cost hydrothermal approach.

One-Pot Synthesis of Cost Effective Carbon Dots from Bio-Degradable Waste

2015 ◽  
Vol 7 (6) ◽  
pp. 473-479
Author(s):  
P. S. Karthik ◽  
A. L. Himaja ◽  
Surya Prakash Singh
Keyword(s):  
Carbon Dots ◽  
Cost Effective ◽  
One Pot ◽  
One Pot Synthesis

scholarly journals Graphitic-Phase C3N4 Nanosheets Combined with MnO2 Nanosheets for Sensitive Fluorescence Quenching Detection of Parathion-Methyl

2021 ◽  
Author(s):  
Bicheng Liu ◽  
Sihao Wu ◽  
Zoujun Peng ◽  
Jiahan Rui ◽  
Ping Qiu
Keyword(s):  
Fluorescence Quenching ◽  
Limit Of Detection ◽  
Organophosphorus Pesticides ◽  
Cost Effective ◽  
Inner Filter Effect ◽  
Enzymatic Hydrolysate ◽  
Analytical Instruments ◽  
Dimethyl Phosphate ◽  
User Friendly

Abstract In this study, we have developed a sensitive approach to measure organophosphorus pesticides (OPs) using graphitic-phase C3N4 nanosheets (g-C3N4) combined with a nanomaterial-based quencher MnO2 nanosheets (MnO2 NS). Because MnO2 NS could quench the fluorescence of g-C3N4 via the inner-filter effect (IFE), the enzymatic hydrolysate (thiocholine, TCh) can efficiently trigger the decomposition of MnO2 nanosheets in the presence of acetylcholinesterase (AChE) and acetylthiocholine, resulting in the fluorescence recovery of g-C3N4. OPs, as inhibitors for AChE activity, can prevent the generation of TCh and decomposition of MnO2 nanosheets, accompanied by fluorescence quenching again. So the AChE-ATCh-MnO2-g-C3N4 system can be utilized to detect OPs quantitatively based on the g-C3N4 fluorescence. Under the optimum conditions, the linear range for the determination of parathion-methyl (PM) and 2,2-dichlorovinyl dimethyl phosphate (DDVP) were found in the range of 0.1-2.1 ng/mL with a limit of detection of 0.069 ng/mL, and 0.5-16 ng/mL with a limit of detection of 0.069 ng/mL, respectively. Finally, this method was exploited for the monitoring of PM in real samples. The advantages of the assay are user-friendly, easy-to-ease, cost-effective compared to sophisticated analytical instruments.

scholarly journals A Fluorescence Inner-Filter Effect Based Sensing Platform for Turn-On Detection of Glutathione in Human Serum

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 228 ◽  
Author(s):  
Shurong Tang ◽  
Xiuhua You ◽  
Quanhui Fang ◽  
Xin Li ◽  
Guangwen Li ◽  
...  
Keyword(s):  
Human Serum ◽  
Limit Of Detection ◽  
Cost Effective ◽  
Inner Filter Effect ◽  
Disease Diagnosis ◽  
Fluorescent Properties ◽  
Serum Samples ◽  
Turn On ◽  
Filter Effect ◽  
Sensing Platform

A novel turn-on fluorescence assay was developed for the rapid detection of glutathione (GSH) based on the inner-filter effect (IFE) and redox reaction. Molybdenum disulfide quantum dots (MoS2 QDs), which have stable fluorescent properties, were synthesized with hydrothermal method. Manganese dioxide nanosheets (MnO2 NSs) were prepared by exfoliating the bulk δ-MnO2 material in bovine serum albumin (BSA) aqueous solution. The morphology structures of the prepared nanoparticles were characterized by transmission electron microscope (TEM). Studies have shown that the fluorescence of MoS2 QDs could be quenched in the presence of MnO2 NSs as a result of the IFE, and is recovered after the addition of GSH to dissolve the MnO2 NSs. The fluorescence intensity showed a good linear relationship with the GSH concentration in the range 20–2500 μM, the limit of detection was 1.0 μM. The detection method was applied to the analysis of GSH in human serum samples. This simple, rapid, and cost-effective method has great potential in analyzing GSH and in disease diagnosis.

Lysosome-targeted ratiometric fluorescent sensor for monitoring pH in living cells based on one-pot-synthesized carbon dots

2020 ◽  
Vol 187 (8) ◽  
Author(s):  
Shaomei Xu ◽  
Xu He ◽  
Yibing Huang ◽  
Xin Liu ◽  
Lihe Zhao ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Fluorescent Sensor ◽  
Living Cells ◽  
One Pot

scholarly journals Carboxyl-Rich Carbon Dots as Highly Selective and Sensitive Fluorescent Sensor for Detection of Fe3+ in Water and Lactoferrin

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4317
Author(s):  
Xinxin Wang ◽  
Yanan Zhao ◽  
Ting Wang ◽  
Yan Liang ◽  
Xiangzhong Zhao ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Density Functional ◽  
Limit Of Detection ◽  
Fluorescent Sensor ◽  
Low Cost ◽  
Hydrothermal Process ◽  
Blue Emission ◽  
Disease Diagnosis ◽  
Obvious Effect ◽  
Physiological Processes

As lactoferrin (LF) plays an essential role in physiological processes, the detection of LF has attracted increasing attention in the field of disease diagnosis. However, most current methods require expensive equipment, laborious pretreatment, and long processing time. In this work, carboxyl-rich carbon dots (COOH-CDs) were facilely prepared through a one-step, low-cost hydrothermal process with tartaric acid as the precursor. The COOH-CDs had abundant carboxyl on the surface and showed strong blue emission. Moreover, COOH-CDs were used as a fluorescent sensor toward Fe3+ and showed high selectivity for Fe3+ with the limit of detection (LoD) of 3.18 nM. Density functional theory (DFT) calculations were performed to reveal the mechanism of excellent performance for Fe3+ detection. Meanwhile, COOH-CDs showed no obvious effect on lactobacillus plantarum growth, which means that COOH-CDs have good biocompatibility. Due to the nontoxicity and excellent detection performance for Fe3+, COOH-CDs were employed as a fluorescent sensor toward LF and showed satisfying performance with an LoD of 0.776 µg/mL, which was better than those of the other methods.

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