MoOx quantum dots with peroxidase-like activity on microfluidic paper-based analytical device for rapid colorimetric detection of H2O2 released from PC12 cells

2020 ◽  
Vol 305 ◽  
pp. 127512 ◽  
Author(s):  
Meng-Meng Liu ◽  
Shan-Hong Li ◽  
Dan-Dan Huang ◽  
Zhi-Wei Xu ◽  
Ya-Wei Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Pc12 Cells ◽  
Colorimetric Detection ◽  
Analytical Device

NiAg-graphene quantum dot-graphene hybrid with high oxidase-like catalytic activity for sensitive colorimetric detection of malathion

2021 ◽  
Author(s):  
Xu Dan ◽  
Ruiyi Li ◽  
Qinsheng Wang ◽  
Yongqiang Yang ◽  
Haiyan Zhu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Quantum Dot ◽  
Colorimetric Detection ◽  
Graphene Quantum Dots ◽  
Functionalized Graphene ◽  
Graphene Quantum Dot ◽  
Nickel Silver

The paper reports the synthesis of nickel-silver-graphene quantum dot-graphene hybrid. Histidine-functionalized graphene quantum dots (His-GQDs) were bonded to graphene oxide (GO) and then combined with Ni2+ and Ag+ to form...

Colorimetric detection of cholesterol based on highly efficient peroxidase mimetic activity of graphene quantum dots

2015 ◽  
Vol 218 ◽  
pp. 42-50 ◽  
Author(s):  
Narsingh R. Nirala ◽  
Shiju Abraham ◽  
Vinod Kumar ◽  
Anushka Bansal ◽  
Anchal Srivastava ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Colorimetric Detection ◽  
Graphene Quantum Dots ◽  
Highly Efficient ◽  
Peroxidase Mimetic

A promising design of microfluidic electromembrane extraction coupled with sensitive colorimetric detection for colorless compounds based on quantum dots fluorescence

Talanta ◽  
2019 ◽  
Vol 194 ◽  
pp. 298-307 ◽  
Author(s):  
Shahram Seidi ◽  
Mirsina Hashemi Ranjbar ◽  
Mahroo Baharfar ◽  
Maryam Shanehsaz ◽  
Mohammad Tajik
Keyword(s):  
Quantum Dots ◽  
Colorimetric Detection ◽  
Electromembrane Extraction

Colorimetric detection of 1,5-anhydroglucitol based on graphene quantum dots and enzyme-catalyzed reaction

2018 ◽  
Vol 112 ◽  
pp. 1217-1224 ◽  
Author(s):  
Zhide Zhou ◽  
Le Zhao ◽  
Zhihong Wang ◽  
Wen Xue ◽  
Yunxiao Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Colorimetric Detection ◽  
Graphene Quantum Dots

scholarly journals Molecular Diagnostic of Ochratoxin A with Specific Aptamers in Corn and Groundnut via Fabrication of A Microfluidic Device

2021 ◽  
Author(s):  
Deepshikha Shahdeo ◽  
Azmat Ali Khan ◽  
Amer M Alanazi ◽  
Yun Suk Huh ◽  
Shruti Shukla ◽  
...  
Keyword(s):  
Ochratoxin A ◽  
Limit Of Detection ◽  
Colorimetric Assay ◽  
Animal Health ◽  
Colorimetric Detection ◽  
Molecular Diagnostic ◽  
Detection Range ◽  
Vis Spectroscopy ◽  
Wide Range ◽  
Analytical Device

Abstract Ochratoxin A (OTA) is one of the predominant mycotoxins that contaminate a wide range of food commodities. In the present study, a 36-mer aptamer was used as a molecular recognition element coupled with gold nanoparticles (AuNPs) for colorimetric detection of OTA in a microfluidic paper-based analytical device (µPADs). The µPADs consisted of three zones: control, detection, and sample, interconnected by channels. The biophysical characterizations of aptamer conjugated AuNPs were done by UV-vis spectroscopy (UV-vis), dynamic Light Scattering (DLS), and transmission electron microscopy (TEM). The developed colorimetric assay for OTA showed a limit of detection of 242, 545, and 95.69 ng/mL in water, corn, and groundnut, respectively. The HPLC detection method achieved acceptable coefficient in standard curves (r2 = 0.9995), better detection range, and recovery rates in spiked corn and groundnut samples as 43.61 ± 2.18% to 87.10 ± 1.82% and 42.01 ± 1.31% to 86.03 ± 2.64% after multiple sample extractions and cleanup steps. However, the developed µPADs analytical device had the potent ability to rapidly detect OTA without any extraction pre-requirement, derivatization, and cleanup steps, thus illustrating its feasibility in the animal health sector, agricultural, and food industries.

Peroxidase mimetic activity of fluorescent NS-carbon quantum dots and their application in colorimetric detection of H2O2 and glutathione in human blood serum

2018 ◽  
Vol 6 (32) ◽  
pp. 5256-5268 ◽  
Author(s):  
Vikas Kumar Singh ◽  
Pradeep Kumar Yadav ◽  
Subhash Chandra ◽  
Daraksha Bano ◽  
Mahe Talat ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Blood Serum ◽  
Human Blood ◽  
Colorimetric Detection ◽  
Carbon Quantum Dots ◽  
Human Blood Serum ◽  
Peroxidase Mimetic

Synthesis of nitrogen–sulphur dual-doped carbon quantum dots and their peroxidase like mimetic activity for the colorimetric detection of H2O2 and glutathione in human blood serum.

scholarly journals A Microfluidic Paper-Based Analytical Device for Type-II Pyrethroid Targets in an Environmental Water Sample

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4107 ◽  
Author(s):  
Sumate Pengpumkiat ◽  
Jintana Nammoonnoy ◽  
Watcharaporn Wongsakoonkan ◽  
Pajaree Konthonbut ◽  
Pornpimol Kongtip
Keyword(s):  
Water Sample ◽  
Detection System ◽  
Low Cost ◽  
Colorimetric Detection ◽  
Environmental Water ◽  
Type Ii ◽  
Environmental Water Sample ◽  
Detection Approach ◽  
Hydrophobic Barrier ◽  
Analytical Device

A detection method for type-II pyrethroids in an environmental water sample using a microfluidic paper-based analytical device (µPAD) is reported here. The detection approach is based on the formation of cyanide from the hydrolysis of type-II pyrethroids and the colorimetric detection of cyanide on a layer-based µPAD. Parafilm and inexpensive laminating pouches were used to create a hydrophobic barrier for the assay on the µPAD. This detection approach was selective to type-II pyrethroids in water for which an environmental water sample was tested. The calibration curves for cypermethrin, deltamethrin, cyhalothrin, and fenvalerate ranged from 2 to 40 µg/mL without sample preconcentration. The lower concentrations of type-II pyrethroids can be assessed by including a preconcentration step prior to the detection on a µPAD. This detection system provides an alternative platform for fast, semiquantitative testing for pesticide contamination in environmental surface water by allowing for portability, low reagent/sample consumption, and low-cost testing.

Sign in / Sign up

Export Citation Format

Share Document