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• W2140010306 abstract "The superoxide radical anion (SO) is a critical biomarker for monitoring cellular stress responses. Electrochemical SO biosensors are frequently constructed through the covalent immobilization of cytochrome c (Cyt c) onto self-assembled monolayers (SAMs); however, a detailed comparison of these systems as well as configuration influence on SO detection is needed to enable robust applications. Two reaction pathways, oxidation of SO by the SAM-modified gold electrode or electron transfer through a protein and monolayer relay, may be involved during the electrochemical detection of SO with Cyt c, depending on the SAM that is used. Although electrodes with SAMs alone can exhibit a high sensitivity and low limit of detection (LOD) for the SO, they can suffer from a strong response to the presence of interferents such as hydrogen peroxide and ascorbic acid. Electrodes with immobilized Cyt c show decreased sensitivity, but exhibit better selectivity and resistance to fouling in complex media. Considering the trade-offs between sensitivity, selectivity, and LOD for SO detection, a bioelectrode made with Cyt c immobilized on dithiobis(succinimidyl)propionate (DTSP) appears to be the most suitable configuration. In phosphate buffer, the DTSP/Cyt c electrode has a sensitivity of 410 nA μM−1 cm−2 and an LOD for SO of 73 nM. Results are also presented for the detection of SO in a complex tissue culture media (MEM) with and without serum, and the sensitivity of the DTSP/Cyt c in MEM in the absence of serum increased to 640 nA μM−1 cm−2. By measuring SO with a DTSP/Cyt c electrode before and after the addition of a bolus of the superoxide dismutase (SOD) enzyme, the specificity of the SOD enzyme can be combined with the sensitivity of Cyt c system." @default.
• W2140010306 created "2016-06-24" @default.
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• W2140010306 date "2008-11-19" @default.
• W2140010306 modified "2023-10-12" @default.
• W2140010306 title "Detection of the Superoxide Radical Anion Using Various Alkanethiol Monolayers and Immobilized Cytochrome <i>c</i>" @default.
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• W2140010306 doi "https://doi.org/10.1021/ac800796b" @default.
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