A5084220482- Free Radicals and Antioxidants
- Electrochemical sensors and biosensors
- Antioxidant Activity and Oxidative Stress
- Advanced Chemical Sensor Technologies
- Advanced Nanomaterials in Catalysis
- Phytochemicals and Antioxidant Activities
- Electrochemical Analysis and Applications
- Advanced biosensing and bioanalysis techniques
- Advanced oxidation water treatment
- Protein Hydrolysis and Bioactive Peptides
- Molecular Sensors and Ion Detection
- Analytical chemistry methods development
- Pesticide Residue Analysis and Safety
- Water Quality Monitoring and Analysis
- Extraction and Separation Processes
- Analytical Chemistry and Chromatography
- Computational Drug Discovery Methods
- Analytical Chemistry and Sensors
- Biosensors and Analytical Detection
- Algal biology and biofuel production
- Phytochemical and Pharmacological Studies
- Animal Nutrition and Physiology
- Radioactive element chemistry and processing
- Sulfur Compounds in Biology
- Tea Polyphenols and Effects
Istanbul University-Cerrahpaşa
2019-2025
Istanbul University
2006-2024
Faculty (United Kingdom)
2020
Engineering (Italy)
2020
Orient-Institut Istanbul
2020
Abstract This project was aimed to identify the quenching chemistry of biologically important reactive oxygen and nitrogen species (ROS/RNS, including radicals), show antioxidant action against through H‐atom electron transfer reactions, evaluate ROS/RNS scavenging activity antioxidants with existing analytical methods while emphasizing underlying chemical principles advantages/disadvantages these methods. In this report, we focused on applications impact assays potentiating future research...
Abstract Due to inadequacies in analytical methodology of total antioxidant capacity (TAC) measurement, proteins are initially separated from the human serum matrix by precipitation and left unmeasured, thereby causing an important "antioxidant gap." The aim this work is measure TAC with modified CUPric Reducing Antioxidant Capacity (CUPRAC) method, identify contribution proteins, especially thiol-containing TAC. CUPRAC results were statistically compared those found reference methods,...
Although both antioxidant capacity and oxidative conversion (hazard) are important in food bioanalytical chemistry, there is considerable confusion the literature between results of these two types assays. After generation ROS medium via Fe(III)-H₂O₂ reaction, attenuation total (TOC; as measured by thiobarbituric acid-reactive substances (TBARS) N,N-dimethyl-p-phenylenediamine (DMPD) assays) was tested for possible correlation with (TAC; cupric reducing (CUPRAC) trolox equivalent (ABTS/TEAC)...
Optical sensors, with or without unlabeled ligand-modified nanoparticles, can measure antioxidant and energetic analytes by altering the visual absorbance fluorescence signal intensities wavelengths.
Abstract This study was carried out to determine the main pigments in some different selected seaweeds and reveal their antioxidant potential regarding ever-increasing demand for utilization of marine human health nutrition. The individual amounts algal were found by reverse phase high-performance liquid chromatography (HPLC) total capacities (TAC) two spectrophotometric TAC assays, namely: CUPRAC (CUPric ion Reducing Antioxidant Capacity) ABTS/TEAC (2,2′-azinobis [3-ethyl benzo...
The main objective of this study is to propose standard analytical methods for the determination and comparison plant-specific antioxidant components found in some herbal products (sold as dietary supplements). Numerous studies indicate that nutritional supplements can offer medical benefits due their content hydrophilic lipophilic molecules well natural extracts or synthetic compounds with properties. While these are marketed boosters, there a limited amount data available on activity...
Biological enzymes have high catalytic activity and unique substrate selectivity; their immobilization may provide cost reduction reusability. Using magnetic nanoparticles (MNPs) as support materials for ensures easy separation from reaction media by an external field. Thus, MNPs were prepared the coprecipitation method, coated with silanol groups, then -NH2-functionalized, finally activated glutaraldehyde. Finally, three different oxidase enzymes, i.e., uricase, glucose oxidase, choline...
Development of easy, practical, and low-cost spectrophotometric methods is required for the selective determination phenolic antioxidants in presence other similar substances. As electron transfer (ET)-based total antioxidant capacity (TAC) assays generally measure reducing ability compounds, thiols phenols cannot be differentiated since they are both responsive to probe reagent. In this study, three most common TAC methods, namely cupric ion (CUPRAC),...
In the present paper, conventional spectrophotometry in conjunction with cloud point extraction-preconcentration were investigated as alternative methods for paracetamol (PCT) assay urine samples. Cloud extraction (CPE) was employed preconcentration of p-aminophenol (PAP) prior to spectrophotometric determination using non-ionic surfactant Triton X-114 (TX-114) an extractant. The developed based on acidic hydrolysis PCT PAP, which reacted at room temperature...
The optical sensor for "tea catechins" was built by immobilizing 2,2'-(1,4-phenylenedivinylene)bis-8-hydroxyquinoline (PBHQ) on TiO₂ nanoparticles (NPs). worked "indophenol blue" dye formation PBHQ-immobilized NPs as a result of p-aminophenol (PAP) autoxidation with dissolved O₂ at pH 10. Among quercetin, rutin, naringenin, naringin, gallic acid, caffeic ferulic p-coumaric catechin, epicatechin, epicatechin gallate, epigallocatechin, epigallocatechin and trolox, only catechin group...
Most milk-applied antioxidant assays in literature are based on the isolation and quantification of individual antioxidative compounds, whereas total capacity (TAC) gives a more holistic picture due to cooperative action antioxidants. Recently, cupric reducing (CUPRAC) method has been modified measure capacities thiol-containing proteins, where classical ammonium acetate buffer – that may otherwise precipitate proteins– was replaced with concentrated urea (able expose embedded thiol groups...