[논문]Noninvasive Label-Free Detection of Cortisol and Lactate Using Graphene Embedded Screen-Printed Electrode

Tuteja, Satish K.; Ormsby, Connor; Neethirajan, Suresh

doi:10.1007/s40820-018-0193-5

Noninvasive Label-Free Detection of Cortisol and Lactate Using Graphene Embedded Screen-Printed Electrode 원문보기

Nano-micro letters, v.10 no.3, 2018년, pp.41 -

Tuteja, Satish K. (BioNano Lab, School of Engineering, University of Guelph, Guelph, ON N1G 2W1 Canada) , Ormsby, Connor (BioNano Lab, School of Engineering, University of Guelph, Guelph, ON N1G 2W1 Canada) , Neethirajan, Suresh (BioNano Lab, School of Engineering, University of Guelph, Guelph, ON N1G 2W1 Canada)

Abstract ▼ AI-Helper

Abstract A sensitive and specific immunosensor for the detection of the hormones cortisol and lactate in human or animal biological fluids, such as sweat and saliva, was devised using the label-free electrochemical chronoamperometric technique. By using these fluids instead of blood, the biosensor becomes noninvasive and is less stressful to the end user, who may be a small child or a farm animal. Electroreduced graphene oxide (e-RGO) was used as a synergistic platform for signal amplification and template for bioconjugation for the sensing mechanism on a screen-printed electrode. The cortisol and lactate antibodies were bioconjugated to the e-RGO using covalent carbodiimide chemistry. Label-free electrochemical chronoamperometric detection was used to analyze the response to the desired biomolecules over the wide detection range. A detection limit of 0.1 ng mL−1 for cortisol and 0.1 mM for lactate was established and a correlation between concentration and current was observed. A portable, handheld potentiostat assembled with Bluetooth communication and battery operation enables the developed system for point-of-care applications. A sandwich-like structure containing the sensing mechanisms as a prototype was designed to secure the biosensor to skin and use capillary action to draw sweat or other fluids toward the sensing mechanism. Overall, the immunosensor shows remarkable specificity, sensitivity as well as the noninvasive and point-of-care capabilities and allows the biosensor to be used as a versatile sensing platform in both developed and developing countries.Graphical AbstractElectronic supplementary materialThe online version of this article (10.1007/s40820-018-0193-5) contains supplementary material, which is available to authorized users.

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Noninvasive Label-Free Detection of Cortisol and Lactate Using Graphene Embedded Screen-Printed Electrode 원문보기

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