scholarly journals Nanozymes with reductase-like activities: antioxidant properties and electrochemical behavior

RSC Advances ◽  
2022 ◽  
Vol 12 (4) ◽  
pp. 2026-2035
Author(s):  
Nataliya Stasyuk ◽  
Galina Gayda ◽  
Taras Kavetskyy ◽  
Mykhailo Gonchar
Keyword(s):  
Electrochemical Behavior ◽  
Antioxidant Properties ◽  
Amperometric Biosensor

Novel Zn/Cd/Cubd nanozymes possesses the ability to mimic coenzyme-dependent selenite reductase. A new amperometric biosensor for determination of selenite was constructed.

scholarly journals Electrochemical Determination of β-Lactoglobulin Employing a Polystyrene Bead-Modified Carbon Nanotube Ink

Biosensors ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 109 ◽  
Author(s):  
Judith Molinari ◽  
Laura Florez ◽  
Anahí Medrano ◽  
Leandro Monsalve ◽  
Gabriel Ybarra
Keyword(s):  
Carbon Nanotube ◽  
Electrochemical Behavior ◽  
Electrochemical Determination ◽  
Amperometric Biosensor ◽  
Polystyrene Bead ◽  
Carboxylic Groups ◽  
Carbon Nanotube Ink ◽  
Β Lactoglobulin ◽  
Sensing Performance

In this article, we introduce the use of a carboxy-functionalized waterborne carbon nanotube ink for the fabrication of an amperometric biosensor aimed at the quantification of β-lactoglobulin. Detection of this protein from cow’s milk was performed by a sandwich immunoassay onto printed carbon nanotube electrodes. The electrodes were printed using a carbon nanotube ink modified with polystyrene beads containing a high amount of carboxylic groups for protein immobilization. This strategy showed enhanced sensing performance compared to the use of oxidative treatments for the functionalization of electrodes. These electrodes showed an excellent electrochemical behavior, and proteins could be immobilized on their surface via the carbodiimide reaction. These antibody-immobilized carbon nanotube electrodes allowed for the detection of β-lactoglobulin in sub-ppm concentrations.

DETERMINATION OF FIG FRUIT EXTRACTS (FICUS CARICA) ANTIOXIDANT PROPERTIES

2012 ◽  
pp. 391-396 ◽  
Author(s):  
I. Mujić ◽  
S. Dudas ◽  
Z. Zeković ◽  
Z. Lepojević ◽  
M. Radojković ◽  
...  
Keyword(s):  
Antioxidant Properties ◽  
Ficus Carica ◽  
Fruit Extracts

Application of polypyrrole nanowires for the development of a tyrosinase biosensor

2015 ◽  
Vol 69 (8) ◽  
Author(s):  
Jolanta Kochana ◽  
Katarzyna Hnida ◽  
Grzegorz Sulka ◽  
Paweł Knihnicki ◽  
Joanna Kozak ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Matrix Composite ◽  
Electrochemical Behavior ◽  
Structural Component ◽  
Operational Stability ◽  
Amperometric Biosensor ◽  
Polypyrrole Nanowires ◽  
Tyrosinase Biosensor ◽  
Scanning Electron

AbstractPolypyrrole nanowires (PPyNWs) were fabricated and examined as a structural component of amperometric biosensor matrix. An enzyme, tyrosinase (TYR), was immobilized onto PPyNWs using glutaraldehyde (GA). Matrix composite morphology was investigated using scanning electron microscopy. Electrochemical behavior of the prepared PPyNWs/GA/TYR biosensor towards catechol was studied and the assessment of its analytical characteristics was carried out taking into account linear range, sensitivity, repeatability, reproducibility and operational stability.

Comparative Evaluation of Onion Germplasm (Allium Cepa L.) Of Bangladesh for Physical And Antioxidant Properties

2021 ◽  
Vol 19 (1) ◽  
pp. 113-123
Author(s):  
PK Dash ◽  
S Das ◽  
MA Mannan ◽  
M Jahan
Keyword(s):  
Free Radicals ◽  
Antioxidant Properties ◽  
Biological Properties ◽  
Physicochemical Analysis ◽  
The Other ◽  
Antioxidant Compounds ◽  
Visual Methods ◽  
Ic50 Value ◽  
Onion Germplasm

Determination of antioxidant activity is one of the key elements for understanding the biological properties of a widely used spice onion (A. cepa). In contrast, physical properties help understand the textural quality of onion necessary for postharvest operations of sorting and grading in particular. Considering the physicochemical importance of onion, the present study focused on the determination of physical attributes and antioxidant content of the onion germplasm in Bangladesh using visual methods and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, respectively. The five-onion germplasms (BARI Piaz-2, BARI Piaz-3, BARI Piaz-4, BARI Piaz-5, Faridpuri Vati) collected from selected onion growers of the Department of Agricultural Extension (DAE) of the southwestern part of Bangladesh were used as treatments for physicochemical analysis at the Horticulture laboratory of the Agrotechnology Discipline, Khulna University, Khulna, Bangladesh during the period from February to August 2019. The laboratory study was laid out in Completely Randomized Design (CRD) with three replications. Most of the physical characteristics of onion were highest in germplasm-1 than those of the other germplasm tested. The results showed that the DPPH free radicals were scavenged by all onion germplasm extracts in a concentration-dependent pattern. The highest IC50 value (238.10 ppm) was noticed in germplasm-3 and the lowest in germplasm-5 (161.29 ppm) with no statistical difference from germplasm-4 (172.41 ppm). The lower IC50 value indicating that onion germplasms-5 and -4 extracts were more potent in scavenging free radicals than the other onion germplasms. Thus, the low IC50 value facilitated the germplasm-5 and -4 to be enriched with antioxidant compounds significantly in higher amounts than the others. SAARC J. Agric., 19(1): 113-123 (2021)

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