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Brainina KZ, Shpigun LK. State‐of‐the‐art electrochemistry for the assessment of oxidative stress and integral antioxidant activity of biological environments. ELECTROCHEMICAL SCIENCE ADVANCES 2022. [DOI: 10.1002/elsa.202100219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Khiena Z. Brainina
- Laboratory of analytical chemisty and separation methods N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences Moscow Russia
| | - Liliya K. Shpigun
- Laboratory of analytical chemisty and separation methods N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences Moscow Russia
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Fu Y, You Z, Xiao A, Liu L, Zhou W. Electrochemical evaluation of the antioxidant capacity of natural compounds on glassy carbon electrode modified with guanine-, polythionine-, and nitrogen-doped graphene. OPEN CHEM 2020. [DOI: 10.1515/chem-2020-0157] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
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.
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Affiliation(s)
- Yafen Fu
- Characteristic Fruit and Vegetable Research Office, Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, 410205, People's Republic of China
| | - Zongyi You
- Characteristic Fruit and Vegetable Research Office, Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, 410205, People's Republic of China
| | - Aiping Xiao
- Characteristic Fruit and Vegetable Research Office, Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, 410205, People's Republic of China
| | - Liangliang Liu
- Characteristic Fruit and Vegetable Research Office, Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha, 410205, People's Republic of China
| | - Weien Zhou
- Hunan Fangsheng Pharmaceutical Co., Ltd, Changsha, 410205, People's Republic of China
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