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Du Y, Guo M, Chen Y, Mo X, Cao J, Hu F. Ultrasensitive cortisol electrochemical immunosensor amplifying by Au single-atom nanozymes and HRP enzymes. Anal Chim Acta 2024; 1303:342462. [PMID: 38609277 DOI: 10.1016/j.aca.2024.342462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 03/06/2024] [Accepted: 03/07/2024] [Indexed: 04/14/2024]
Abstract
Cortisol, a corticosteroid hormone as a primary stress hormone response to internal and external stress, has been regarded as a gold standard reliable biomarker to evaluate human mental stress. The double enzymes strategy, using nanozyme and enzyme amplifying the electrochemical signal, has been widely used to improve the performance of electrochemical biosensors. An ultra-sensitive electrochemical cortisol sensor based on Au single-atom nanozymes had been fabricated through HRP labeled anti-cortisol antibody binding with Au by Au-S bond. Based on the high catalytic activity of Au single-atom nanozymes and the high selectivity of HRP-labeled anti-cortisol antibodies, the cortisol electrochemical sensor-based Au single-atom nanozymes had an excellent response to cortisol, such as high electrochemical activity, high sensitivity, high selectivity, and wide linear range (0.15-300 ng mL-1) and low detection (0.48 pg mL-1) through the four-parameter logistic model with 95% confidence. The electrochemical cortisol sensor was used to determine the cortisol concentration of human saliva at different times.
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Affiliation(s)
- Yongling Du
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, China.
| | - Min Guo
- School of Pharmacy, Lanzhou University, State Key Laboratory of Applied Organic Chemistry, Codonopsis Radix Industrial Technology Engineering Research Center, Gansu Province, Lanzhou, Gansu, 730000, China
| | - Yan Chen
- School of Pharmacy, Lanzhou University, State Key Laboratory of Applied Organic Chemistry, Codonopsis Radix Industrial Technology Engineering Research Center, Gansu Province, Lanzhou, Gansu, 730000, China
| | - Xiaohui Mo
- School of Pharmacy, Lanzhou University, State Key Laboratory of Applied Organic Chemistry, Codonopsis Radix Industrial Technology Engineering Research Center, Gansu Province, Lanzhou, Gansu, 730000, China
| | - Junlei Cao
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, 730000, China
| | - Fangdi Hu
- School of Pharmacy, Lanzhou University, State Key Laboratory of Applied Organic Chemistry, Codonopsis Radix Industrial Technology Engineering Research Center, Gansu Province, Lanzhou, Gansu, 730000, China.
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