Innovations upon antioxidant capacity evaluation for cosmetics: A photoelectrochemical sensor exploitation based on N-doped graphene/TiO2 nanocomposite

2018 ◽  
Vol 259 ◽  
pp. 963-971 ◽  
Author(s):  
Shuang Ni ◽  
Fangjie Han ◽  
Wei Wang ◽  
Dongfang Han ◽  
Yu Bao ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Capacity Evaluation ◽  
Photoelectrochemical Sensor ◽  
Doped Graphene

Electrochemical evaluation of the antioxidant capacity of natural compounds on glassy carbon electrode modified with guanine-, polythionine-, and nitrogen-doped graphene

2020 ◽  
Vol 18 (1) ◽  
pp. 1054-1063
Author(s):  
Yafen Fu ◽  
Zongyi You ◽  
Aiping Xiao ◽  
Liangliang Liu ◽  
Weien Zhou
Keyword(s):  
Antioxidant Capacity ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Nitrogen Doped ◽  
Oxidation Peak Current ◽  
Capacity Evaluation ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

AbstractAn electrochemical sensor based on guanine-, polythionine-, and nitrogen-doped graphene modified glassy carbon electrode (G/PTH/NG/GCE) was fabricated and applied for antioxidant capacity evaluation of natural compounds and complexes in electrochemical method since natural sources of active compounds exhibited various antioxidant activities. When the antioxidants existed in the system, the generated hydroxyl radicals were scavenged and the damage to guanine immobilized on the electrode was reduced less resulting in the oxidation peak current increased in square wave voltammetry. After the modifications of polythionine- and nitrogen-doped graphene, the oxidation peak current was improved. The effects of pH, incubation time, and concentrations of guanine and Fe2+ ions on the performances of the electrode were investigated and optimized. The G/PTH/NG/GCE showed good linearity, reproducibility, and storage stability for antioxidant capacity evaluation of ascorbic acid at the optimum conditions. The antioxidant capacities of three flavonoids and three plant extracts were measured using the G/PTH/NG/GCE and DPPH methods. Myricetin showed the highest antioxidant capacity in both electrochemical and DPPH methods. The proposed G/PTH/NG/GCE exhibited easy fabrication procedure, rapid detection time, and low cost for the detection of antioxidant activity for various kinds of samples.

Total antioxidant capacity evaluation: Critical steps for assaying berry antioxidant features

BioFactors ◽  
2005 ◽  
Vol 23 (4) ◽  
pp. 221-227 ◽  
Author(s):  
Jessica Scalzo ◽  
Bruno Mezzetti ◽  
Maurizio Battino
Keyword(s):  
Antioxidant Capacity ◽  
Total Antioxidant Capacity ◽  
Capacity Evaluation ◽  
Total Antioxidant

Antioxidant Capacity Evaluation In Different Extravirgin Olive Oils

2010 ◽  
Vol 42 ◽  
pp. 793
Author(s):  
Giorgio Galanti ◽  
Matteo Becatti ◽  
Niccolò Taddei ◽  
Laura Stefani ◽  
Claudia Fiorillo
Keyword(s):  
Antioxidant Capacity ◽  
Olive Oils ◽  
Capacity Evaluation

Flavonoids electrochemical detection in fruit extracts and total antioxidant capacity evaluation

Talanta ◽  
2016 ◽  
Vol 154 ◽  
pp. 284-291 ◽  
Author(s):  
Sara M.C. Gomes ◽  
Mariana-Emilia Ghica ◽  
Isaide Araujo Rodrigues ◽  
Eric de Souza Gil ◽  
Ana Maria Oliveira-Brett
Keyword(s):  
Antioxidant Capacity ◽  
Electrochemical Detection ◽  
Total Antioxidant Capacity ◽  
Fruit Extracts ◽  
Capacity Evaluation ◽  
Total Antioxidant

Engineered Photoelectrochemical Platform for Rational Global Antioxidant Capacity Evaluation Based on Ultrasensitive Sulfonated Graphene–TiO2 Nanohybrid

2014 ◽  
Vol 86 (20) ◽  
pp. 10171-10178 ◽  
Author(s):  
Lingnan Wang ◽  
Weiguang Ma ◽  
Shiyu Gan ◽  
Dongxue Han ◽  
Qixian Zhang ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Capacity Evaluation ◽  
Sulfonated Graphene

scholarly journals Fermented beverages based on Hylocereus lemairei (Hook.) fruits: Chemical characterization and antioxidant capacity evaluation

2021 ◽  
Vol 10 (6) ◽  
pp. e12010615490
Author(s):  
Anne Caroline de Albuquerque Sales ◽  
Lizeth Mercedes Garcia Jaimes ◽  
Marcos Batista Machado ◽  
Edgar Aparecido Sanches ◽  
Pedro Henrique Campelo ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Phenolic Content ◽  
Chemical Characterization ◽  
Chemical Compounds ◽  
Total Phenolic ◽  
Fermented Beverages ◽  
Physical Chemical ◽  
Capacity Evaluation ◽  
Dragon Fruit

Hylocereus lemairei (Hook.) is a plant popularly known as pitaya-purple, whose fruits are known as dragon fruit. This paper aimed to carry out the physical-chemical and chemical characterization of fermented beverages based on H. lemairei fruits. Fermented beverages were elaborated using two different commercial yeasts of Saccharomyces cerevisiae [Biolievito Bayanus (BB) and Arom Cuvée (AC)] and were characterized by NMR. In addition, the antioxidant capacity (DPPH and ABTS) and Total Phenolic Content (TPC) based on the Folin Ciocalteu method were determined. According to the legislation, the fermented beverages from BB and AC showed alcoholic levels of 12.9 and 12.5% (v/v) and pH of 3.9 and 3.8, respectively. The chemical compounds of both beverages were similar, whose major organic compounds are glycerol, myo-inositol, tyrosol, and citric and succinic acids. According to the DPPH and TPC evaluation, BB beverage (248.3 µM TE and 117.6 mg GAE L-1) presented higher antioxidant capacity when compared to the BC beverage (219.8 µM TE and 108.4 mg GAE L-1). In the ABTS assay, both beverages were not statistically different (p < 0.05). Tyrosol may be responsible for increasing the antioxidant capacity and phenolic compounds content when compared to the control juice used to prepare fermented beverages.

scholarly journals Interaction effects on a gold nanoparticle-based colorimetric assay for antioxidant capacity evaluation of polyphenols

RSC Advances ◽  
2020 ◽  
Vol 10 (25) ◽  
pp. 14705-14713
Author(s):  
Yanhui Wang ◽  
Shiqi Liu ◽  
Mengnan Yang ◽  
Ahmed Aboueloyoun Taha ◽  
Jing Wang ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Gold Nanoparticle ◽  
Colorimetric Assay ◽  
Interaction Effects ◽  
Capacity Evaluation

Interaction effects of endogenous polyphenols remarkably influenced the performance of gold nanoparticle-based colorimetric assay for antioxidant capacity evaluation.

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