Turn-off–on fluorescence probe based on 3-mercaptopropionic acid-capped CdS quantum dots for selective and sensitive lysozyme detection

RSC Advances ◽  
2016 ◽  
Vol 6 (89) ◽  
pp. 85795-85801 ◽  
Author(s):  
Xiaotong Liu ◽  
Weidan Na ◽  
Zhengyi Qu ◽  
Xingguang Su
Keyword(s):  
Quantum Dots ◽  
Fluorescence Probe ◽  
Fluorescence Assay ◽  
Cds Quantum Dots ◽  
Mercaptopropionic Acid ◽  
Cds Qds

The fluorescence of CdS QDs was first quenched by hemoglobin and then restored with the increasing concentration of the lysozyme in a certain range. Therefore, a fluorescence assay for the determination of lysozyme was established.

scholarly journals L-Aspartic Acid Capped CdS Quantum Dots as a High Performance Fluorescence Assay for Sliver Ions (I) Detection

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1165 ◽  
Author(s):  
Zhezhe Wang ◽  
Xuechun Xiao ◽  
Yue Yang ◽  
Tong Zou ◽  
Xinxin Xing ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Aspartic Acid ◽  
High Performance ◽  
Fluorescence Probe ◽  
Hydrothermal Process ◽  
Fluorescence Emission ◽  
Fluorescence Assay ◽  
Cds Quantum Dots ◽  
Relative Standard ◽  
Cds Qds

A new high performance fluorescence assay for detection of Ag+ based on CdS quantum dots (QDs) using L-Aspartic acid (L-Asp) as a stabilizer was proposed in this work. The CdS quantum dots conjugation with L-Aspartic acid (L-Asp@CdS QDs) were successfully synthesized via a simple hydrothermal process. The QDs have a fluorescence emission band maximum at 595 nm with a quantum yield of 11%. The obtained CdS QDs exhibit a particle size of 1.63 ± 0.28 nm and look like quantum dot flowers. Basically, the fluorescence intensity of L-Asp@CdS QDs can be enhanced only upon addition of Ag+ and a redshift in the fluorescence spectrum was observed. Under optimum conditions, the fluorescence enhancement of L-Asp@CdS QDs appeared to exhibit a good linear relationship in between 100–7000 nM (R2 = 0.9945) with the Ag+ concentration, with a detection limit of 39 nM. The results indicated that the L-Asp@CdS QDs were well used in detection for Ag+ as fluorescence probe in aqueous solution with high sensitivity and selectivity. Moreover, the sensing system has been applied in detection Ag+ in real water samples. The recovery test results were 98.6%~113%, and relative standard deviation (n = 5) is less than 3.6%, which was satisfactory.

Enhanced electrochemiluminescence of CdS quantum dots capped with mercaptopropionic acid activated by EDC for Zika virus detection

The Analyst ◽  
2021 ◽  
Author(s):  
Hui-Jun Zhang ◽  
Jin Zhu ◽  
Ning Bao ◽  
Shou-Nian Ding
Keyword(s):  
Quantum Dots ◽  
Zika Virus ◽  
Virus Detection ◽  
Cds Quantum Dots ◽  
Mercaptopropionic Acid ◽  
Sandwich Type ◽  
Cds Qds

The mechanism of enhanced ECL of MPA@CdS QDs by EDC activation was investigated, and a sandwich-type ECL immunosensor has been designed for Zika virus detection.

Determination of Trace Iron in Chinese Herbal Medicine Using CdS Quantum Dots as Fluorescence Probes

2012 ◽  
Vol 455-456 ◽  
pp. 1195-1199
Author(s):  
Yun Long Zeng ◽  
Xia Fei Li ◽  
Chun Ran Tang ◽  
Hao Wen Huang ◽  
Ya Jing Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Probe ◽  
Copper Ion ◽  
Water Soluble ◽  
Fluorescence Probes ◽  
Cds Quantum Dots ◽  
Buffer Solution ◽  
Green Protocol ◽  
Quenching Method

A simple A green protocol for synthesis of high quality, water-soluble and biocompatible CdS QDs have been developed in aqueous solution with amylum as stabilizing agent. The QDs were characterized by AMF and spectral methods. A fluorescence quenching method was developed for determination of iron (ΙΙΙ) with water soluble CdS quantum dots (QDs) as fluorescence probe. In pH 8.5 boric acid–borax buffer solution, the QDs show a high selective to ferric ion. The common cations, such as Ca2+, Mg2+, Zn2+, Fe2+ et al, have no effect on interference but copper ion. The fluorescence intensity of the QDs decreased linearly with the iron (QDs ) concentration in the range of 200 μM to 60 nM with a detection limit of 20 nM. It has been applied to determinate of iron in Angelica, Astragalus, Shouwu, ligusticum wallichii and radix rehmanniae recen.

Mn-doped ZnS quantum dots with a 3-mercaptopropionic acid assembly as a ratiometric fluorescence probe for the determination of curcumin

RSC Advances ◽  
2015 ◽  
Vol 5 (28) ◽  
pp. 21504-21510 ◽  
Author(s):  
Xiaojuan Zhao ◽  
Fengxia Li ◽  
Qingyan Zhang ◽  
Zengbo Li ◽  
Yehong Zhou ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Fluorescence Probe ◽  
Ratiometric Fluorescence ◽  
Mercaptopropionic Acid ◽  
Mn Doped

Mn-doped ZnS quantum dots capped with 3-mercaptopropionic acid (MPA) were synthesized by a facile method in aqueous solution as a ratiometric fluorescent (I590 nm/I458 nm) probe for curcumin.

A simple and sensitive flow injection method based on the catalytic activity of CdS quantum dots in an acidic permanganate chemiluminescence system for determination of formaldehyde in water and wastewater

2016 ◽  
Vol 15 (4) ◽  
pp. 496-505 ◽  
Author(s):  
Alireza Khataee ◽  
Roya Lotfi ◽  
Aliyeh Hasanzadeh ◽  
Mortaza Iranifam
Keyword(s):  
Quantum Dots ◽  
Catalytic Activity ◽  
Flow Injection ◽  
Cds Quantum Dots ◽  
Injection Method ◽  
Water And Wastewater ◽  
Cds Qds

The intensity of emitted light from KMnO4–HCHO–CdS QDs system is linearly proportional to HCHO concentration.

Highly sensitive determination of copper (II) ions using fluorescence and chemiluminescence emissions of modified CdS quantum dots after it’s preconcentration by dispersive liquid–liquid microextraction

2017 ◽  
Vol 95 (6) ◽  
pp. 704-709 ◽  
Author(s):  
Zohreh Saeedi ◽  
Ali Lotfi ◽  
Javad Hassanzadeh ◽  
Nafiseh Bagheri
Keyword(s):  
Quantum Dots ◽  
High Yield ◽  
Cds Quantum Dots ◽  
Quenching Effect ◽  
Highly Sensitive ◽  
Cds Qds ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction ◽  
Determination Of Copper

Two highly sensitive and selective methods based on fluorescence (FL) and chemiluminescence (CL) emissions of 8-mercaptoquinoline-capped CdS quantum dots (MCQ-CdS QDs) were described for the determination of copper (II) after it’s preconcentration. High fluorescent CdS QDs, synthesized in an aqueous medium, generated a relatively intense CL emission in the presence of potassium permanganate as an oxidant. Furthermore, low quantities of copper (II) ions showed a remarkable quenching effect on both of the CL and FL emissions of MCQ-CdS QDs. Based on this effect, two selective and simple methods were established for Cu2+, and the detection limits of 0.28 and 0.026 ng mL−1 were obtained for the FL and CL methods, respectively. Also, due to the high propensity of MCQ to Cu2+, good selectivity was obtained and no sensible interfering effects from other metal ions were observed. To more sensitize the developed method, an efficient preconcentration process was designed based on the high-yield ultrasound-assisted temperature-controlled ionic liquid dispersive liquid–liquid microextraction (UA-TIL-DLLME) method. Under the optimum conditions, the extracted Cu2+ showed a suppressing effect on the FL and CL emissions of CdS QDs proportional to its initial concentration over the ranges of 0.008–1.4 and 0.001–1.4 ng mL−1, respectively. The limits of detection of 3.7 and 0.37 pg mL−1, respectively, were also achieved. The established methods showed great features and were satisfactorily applied to the monitoring of ultratrace Cu2+ in some different environmental samples.

scholarly journals Sensitive Determination of Cetirizine Using CdS Quantum dots as Oxidase Mimic-mediated Chemiluminescence of Sulfite

2016 ◽  
Vol 5 (7) ◽  
pp. 59-62 ◽  
Author(s):  
Reza Hoseinpour Kouhestany ◽  
Seyed Naser Azizi ◽  
Parmis Shakeri ◽  
Shaghyegh Rahmani
Keyword(s):  
Quantum Dots ◽  
Limit Of Detection ◽  
Ultra Violet ◽  
Cost Effective ◽  
Pharmaceutical Journal ◽  
Water Soluble ◽  
Cds Quantum Dots ◽  
Study Results ◽  
Cds Qds

A new chemiluminescence (CL) method using cadmium sulfide quantum dots (QDs) as sensitizers is proposed for the chemiluminometric determination of cetirizine pharmaceutical formulation. CdS QDs were synthesized by using water soluble route. The nanoparticles were structurally and optically characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Ultra Violet-Visible (UV–Vis) absorption spectroscopy and scanning electron microscopy (SEM). In this study results shows that CdS quantum dots are enhancers of the weak CL emission. Trace amounts of cetirizine improved the sensitize effect of CdS quantum dots yielding a significant chemiluminescence enhancement of the Ce(IV)–SO32?–CdS QDs system. So, a new CL analysis system was selected for the determination of cetirizine. There is a good linear relationship between the relative chemiluminescence intensity and the concentration of cetirizine in the range of 1×10?9– 1×10?6 molL?1 with a correlation coefficient (R2) of 0.9963 at the optimum conditions. The limit of detection (LOD) of this system was found to be 5×10?11 M. This method is simple, sensitive and cost effective, and also is accommodating for pharmaceutical applications.Kouhestany et al., International Current Pharmaceutical Journal, June 2016, 5(7): 59-62

Thioglycolic Acid-Capped CdS Quantum Dots Conjugated to α-Amylase as a Fluorescence Probe for Determination of Starch at Low Concentration

2016 ◽  
Vol 26 (5) ◽  
pp. 1787-1794 ◽  
Author(s):  
Mahnoush Tayebi ◽  
Mohammad Tavakkoli Yaraki ◽  
Azadeh Mogharei ◽  
Mahnaz Ahmadieh ◽  
Mohammadreza Tahriri ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Probe ◽  
Thioglycolic Acid ◽  
Cds Quantum Dots ◽  
Low Concentration
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