scholarly journals Pt Nanoparticles Anchored on NH2-MIL-101 with Efficient Peroxidase-Like Activity for Colorimetric Detection of Dopamine

Chemosensors ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 140
Author(s):  
Jing Li ◽  
Keying Xu ◽  
Yang Chen ◽  
Jie Zhao ◽  
Peiyao Du ◽  
...  
Keyword(s):  
Active Sites ◽  
Clinical Medicine ◽  
Colorimetric Assay ◽  
Colorimetric Detection ◽  
Pt Nanoparticles ◽  
Robust Detection ◽  
Color Changes ◽  
Relevant Role ◽  
Metal Organic ◽  
The Central Nervous System

Dopamine (DA) is an important catecholamine neurotransmitter that plays a highly relevant role in regulating the central nervous system, and abnormal DA content can cause many immune-related diseases. Hence, it is of significance to sensitively and specifically identify DA for clinical medicine. In this work, Pt/NH2-MIL-101 hybrid nanozymes with bimetallic catalytic centers were fabricated by forming coordinate bonds between Pt nanoparticles (Pt NPs) and –NH2 on metal–organic frameworks (MOF). The catalytic activity of Pt/NH2-MIL-101 was increased by 1.5 times via enlarging the exposure of more active sites and improving the activity of the active sites through the strategy of forming bimetallic catalytic centers. In the presence of DA, competing with 3, 3′, 5, 5′-tetramethylbenzidine (TMB) for the generated hydroxyl radicals (•OH), the blue oxidation state TMB (Ox-TMB) is reduced to colorless TMB, showing dramatic color changes. The Pt/NH2-MIL-101-based colorimetric assay enables the sensitive and robust detection of DA molecules with a detection limit of only 0.42 μM and has an observable potential in clinical applications.

Copper fumarate with high-bifunctional nanozyme activities at different pH for glucose and epinephrine colorimetric detection in human serum

The Analyst ◽  
2021 ◽  
Author(s):  
Meihui Ying ◽  
Guizeng Yang ◽  
Yuanjie Xu ◽  
Hui-Ling Ye ◽  
Xing Lin ◽  
...  
Keyword(s):  
Human Serum ◽  
Active Sites ◽  
Colorimetric Detection ◽  
Metal Organic Frameworks ◽  
High Density ◽  
Detection Methods ◽  
Metal Organic

Metal-organic frameworks (MOFs) have attracted extensive attention in the construction of colorimetric detection methods due to their easy modification and high density of active sites. However, most of the reported...

Defective Pt nanoparticles encapsulated in mesoporous metal–organic frameworks for enhanced catalysis

2018 ◽  
Vol 54 (64) ◽  
pp. 8822-8825 ◽  
Author(s):  
Qiang Wang ◽  
Xu-Sheng Wang ◽  
Chun-Hui Chen ◽  
Xue Yang ◽  
Yuan-Biao Huang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Metal Organic Frameworks ◽  
Pt Nanoparticles ◽  
Mild Conditions ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
First Time

Highly ultrafine defective Pt nanoparticles (NPs) encapsulated in the mesopores of MIL-101 (Pt(Co)@MIL-101) were achieved for the first time through a chemical dealloying approach. The obtained material could provide more active sites to contact reactants and showed superior catalytic activity towards the hydrogenation of nitroarenes under mild conditions.

Prussian blue modified metal–organic framework MIL-101(Fe) with intrinsic peroxidase-like catalytic activity as a colorimetric biosensing platform

RSC Advances ◽  
2015 ◽  
Vol 5 (119) ◽  
pp. 98215-98221 ◽  
Author(s):  
Fengjuan Cui ◽  
Qingfang Deng ◽  
Li Sun
Keyword(s):  
Catalytic Activity ◽  
Prussian Blue ◽  
Active Sites ◽  
Colorimetric Assay ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Colorimetric Biosensing ◽  
Organic Framework

Nanosized porous PB/MIL-101(Fe) was facilely prepared by growing Prussian blue (PB) on MIL-101(Fe). It has more active sites and pores for peroxidase substrates and gives a simple, sensitive colorimetric assay to detect H2O2and glucose.

Highly efficient colorimetric detection of cancer cells utilizing Fe-MIL-101 with intrinsic peroxidase-like catalytic activity over a broad pH range

RSC Advances ◽  
2015 ◽  
Vol 5 (119) ◽  
pp. 97910-97917 ◽  
Author(s):  
Daomei Chen ◽  
Bin Li ◽  
Liang Jiang ◽  
Deliang Duan ◽  
Yizhou Li ◽  
...  
Keyword(s):  
Surface Modification ◽  
Catalytic Activity ◽  
Folic Acid ◽  
Cancer Cells ◽  
Colorimetric Assay ◽  
Colorimetric Detection ◽  
Metal Organic Frameworks ◽  
Metal Organic ◽  
Iron Based ◽  
Ph Range

We take advantage of the folic acid conjugated iron-based metal–organic frameworks (Fe-MIL-101) without any surface modification to design a simple and sensitive colorimetric assay to detect cancer cells based on its intrinsic peroxidase-like activity over broad pH range.

Metal-organic-framework derived hollow manganese nickel selenide spheres confined with nanosheets on nickel foam for hybrid supercapacitors

2021 ◽  
Author(s):  
Bahareh ameri ◽  
Akbar Mohammadi Zardkhoshoui ◽  
Saied Saeed Hosseiny Davarani
Keyword(s):  
Active Sites ◽  
Nickel Foam ◽  
Metal Organic Framework ◽  
High Surface ◽  
Metal Organic Frameworks ◽  
High Surface Area ◽  
Supercapacitive Performance ◽  
Hybrid Supercapacitors ◽  
Porous Networks ◽  
Metal Organic

Metal-organic frameworks (MOFs) derived nanoarchitectures have special features, such as high surface area (SA), abundant active sites, exclusive porous networks, and remarkable supercapacitive performance when compared to traditional nanoarchitectures. Herein,...

A small molecular, a big scissoring effect: sodium dodecyl sulfate working on two-dimensional metal organic frameworks

CrystEngComm ◽  
2021 ◽  
Author(s):  
Qing Luo ◽  
Zhen Ding ◽  
Huamin Sun ◽  
Zhen Cheng ◽  
Naien SHI ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Active Sites ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Sodium Dodecyl ◽  
Advanced Materials ◽  
Controlled Synthesis ◽  
Two Dimensional ◽  
Dodecyl Sulfate ◽  
Metal Organic

Ultrathin two-dimensional (2D) metal-organic framework (MOF) nanosheets are prosperous advanced materials due to their particularly thin thickness and exposed active sites. The difficulty in the controlled synthesis of 2D MOF...

scholarly journals Ce-MOF with Intrinsic Haloperoxidase-Like Activity for Ratiometric Colorimetric Detection of Hydrogen Peroxide

Biosensors ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 204
Author(s):  
Yanyan Cheng ◽  
Ling Liang ◽  
Fanggui Ye ◽  
Shulin Zhao
Keyword(s):  
Structural Characteristics ◽  
Metal Organic Framework ◽  
Colorimetric Detection ◽  
Mixed Valence ◽  
Bromophenol Blue ◽  
Phenol Red ◽  
Chromogenic Substrate ◽  
Colorimetric Sensing ◽  
Sensing Platform ◽  
Metal Organic

Metal–organic framework (MOF) nanozymes, as emerging members of the nanozymes, have received more and more attention due to their composition and structural characteristics. In this work, we report that mixed-valence state Ce-MOF (MVCM) has intrinsic haloperoxidase-mimicking activity. MVCM was synthesized by partial oxidation method using Ce-MOF as a precursor. In the presence of H2O2 and Br−, MVCM can catalyze oxidative bromination of chromogenic substrate phenol red (PR) to produce the blue product bromophenol blue (Br4PR), showing good haloperoxidase-like activity. Because of the special chromogenic substrate, we constructed a ratiometric colorimetric-sensing platform by detecting the absorbance of the MVCM-(PR, Br−) system at wavelengths of 590 and 430, for quantifying H2O2, where the detection limit of the H2O2 is 3.25 μM. In addition, the haloperoxidase-mimicking mechanism of the MVCM is proposed. Moreover, through enzyme kinetics monitoring, the Km (H2O2 and NH4Br) of the MVCM is lower than that of cerium oxide nanomaterials, indicating that the MVCM has a stronger binding affinity for H2O2 and NH4Br than other materials. This work provides more application prospects for the development of nanozymes in the field of biosensors in the future.

scholarly journals Molecularly imprinted electrospun fiber membrane for colorimetric detection of hexanoic acid

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 500-510
Author(s):  
Xiaoguang Ying ◽  
Jieyuan He ◽  
Xiao Li
Keyword(s):  
Low Cost ◽  
Electrospun Fiber ◽  
Colorimetric Detection ◽  
Hexanoic Acid ◽  
Bromocresol Purple ◽  
Fiber Membrane ◽  
Color Changes ◽  
Before And After ◽  
The Difference ◽  
Imagej Software

Abstract An imprinted electrospun fiber membrane was developed for the detection of volatile organic acids, which are key components of human body odor. In this study, hexanoic acid (HA) was selected as the target, polymethyl methacrylate (PMMA) was used as the substrate, and colorimetric detection of HA was achieved by a bromocresol purple (BCP) chromogenic agent. The results showed that the morphology of the fiber membrane was uniform and continuous, and it showed excellent selectivity and specificity to HA. Photographs of the color changes before and after fiber membrane adsorption were recorded by a camera and quantified by ImageJ software by the difference in gray value (ΔGray). This method is simple, intuitive, and low cost and has great potential for application in human odor analysis.

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