Formation of porous Cu hydroxy double salt nanoflowers derived from metal–organic frameworks with efficient peroxidase-like activity for label-free detection of glucose

Nanoscale ◽  
2018 ◽  
Vol 10 (25) ◽  
pp. 11948-11954 ◽  
Author(s):  
Ali Li ◽  
Xijiao Mu ◽  
Tianrong Li ◽  
Huang Wen ◽  
Wanchong Li ◽  
...  
Keyword(s):  
Colorimetric Detection ◽  
Metal Organic Frameworks ◽  
Copper Acetate ◽  
Double Salt ◽  
Label Free ◽  
Label Free Detection ◽  
Metal Organic

With a leaf-like MOF-5 as both a precursor and a template and copper acetate as a second precursor, CuHDS nanoflowers have been prepared for colorimetric detection of glucose.

Encapsulation of hemin in Fe-based metal-organic frameworks and its application for the direct determination of aflatoxin M1

2021 ◽  
pp. 1-10
Author(s):  
F. Jahangiri-Dehaghani ◽  
H.R. Zare ◽  
Z. Shekari
Keyword(s):  
Electrochemical Impedance ◽  
Metal Organic Frameworks ◽  
Direct Determination ◽  
Differential Pulse ◽  
Aflatoxin M1 ◽  
Label Free ◽  
Electrochemical Aptasensor ◽  
Selective Determination ◽  
Metal Organic

A label-free electrochemical aptasensor was constructed for the sensitive and selective determination of AFM1. For preparation of the aptasensor, the AFM1 aptamer was immobilised on the surface of a glassy carbon electrode modified with hemin encapsulated in Fe-based metal-organic frameworks (hemin@Fe-MIL-101). The morphology and the structure of Fe-MIL-101 and hemin@Fe-MIL-101 were evaluated by scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray powder diffraction and Brunauer-Emmett-Teller-N2 sorption methods. Electrochemical impedance spectroscopy and cyclic voltammetry were performed to monitor the fabrication process of the electrochemical aptasensor. The electrochemical reduction current of hemin encapsulated in Fe-MIL-101 serves as a signal for the quantitative determination of AFM1. Differential pulse voltammetry was done to determine the AFM1 concentration in the linear range of 1.0×10-1-100.0 ng/ml. The detection limit of AFM1 was estimated to be 4.6×10-2 ng/ml. Finally, the fabricated aptasensor was applied to determine AFM1 in raw and boiled milk samples.

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...

Fe–Ni metal–organic frameworks with prominent peroxidase-like activity for the colorimetric detection of Sn2+ ions

The Analyst ◽  
2020 ◽  
Vol 145 (19) ◽  
pp. 6349-6356
Author(s):  
Ye Hu ◽  
Chaochao Yue ◽  
Jing Wang ◽  
Yuhua Zhang ◽  
Wenhui Fang ◽  
...  
Keyword(s):  
Colorimetric Detection ◽  
Metal Organic Frameworks ◽  
Blue Color ◽  
Metal Organic

The synthesized Fe–Ni-MOF could oxidize TMB to produce oxTMB with blue color. The presence of Sn2+ ions could make the oxTMB color lighter, hence colorimetric detection of Sn2+ ions is realized.

A functional FePt@MOFs (MIL-101(Fe)) nano-platform for high efficient colorimetric determination of H2O2

The Analyst ◽  
2019 ◽  
Vol 144 (8) ◽  
pp. 2716-2724 ◽  
Author(s):  
Zunfu Hu ◽  
Yongheng Yin ◽  
Qingyun Liu ◽  
Xiuwen Zheng
Keyword(s):  
Colorimetric Detection ◽  
Metal Organic Frameworks ◽  
Fept Nanoparticles ◽  
Colorimetric Determination ◽  
High Efficient ◽  
Metal Organic ◽  
Surface Modified

Surface-modified FePt nanoparticles were loaded into metal–organic frameworks in a facile in situ way and the resulting material (FePt@MOFs NCs) acted as a high efficient colorimetric detection agent for H2O2.

scholarly journals An Aptamer-Based Biosensor for Direct, Label-Free Detection of Melamine in Raw Milk

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3227 ◽  
Author(s):  
Naoto Kaneko ◽  
Katsunori Horii ◽  
Joe Akitomi ◽  
Shintaro Kato ◽  
Ikuo Shiratori ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Background Noise ◽  
Colorimetric Detection ◽  
Raw Milk ◽  
Detection Methods ◽  
Label Free ◽  
Label Free Detection ◽  
High Concentrations ◽  
Direct Label ◽  
Urinary Problems

Melamine, a nitrogen-rich compound, has been used as a food and milk additive to falsely increase the protein content. However, melamine is toxic, and high melamine levels in food or in milk can cause kidney and urinary problems, or even death. Hence, the detection of melamine in food and milk is desirable, for which numerous detection methods have been developed. Several methods have successfully detected melamine in raw milk; however, they require a sample preparation before the analyses. This study aimed to develop an aptamer-DNAzyme conjugated biosensor for label-free detection of melamine, in raw milk, without any sample preparation. An aptamer-DNAzyme conjugated biosensor was developed via screening using microarray analysis to identify the candidate aptamers followed by an optimization, to reduce the background noise and improve the aptamer properties, thereby, enhancing the signal-to-noise (S/N) ratio of the screened biosensor. The developed biosensor was evaluated via colorimetric detection and tested with raw milk without any sample preparation, using N-methylmesoporphyrin IX for fluorescence detection. The biosensor displayed significantly higher signal intensity at 2 mM melamine (S/N ratio, 20.2), which was sufficient to detect melamine at high concentrations, in raw milk.

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