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Talanta. 2018 Jul 1;184:507-512. doi: 10.1016/j.talanta.2018.03.027. Epub 2018 Mar 12.

A facile route to glycated albumin detection.

Author information

1
Carthage University, UR17ES22 Research Unit of Nanobiotechnology and Valorisation of Medicinal Plants, National Institute of Applied Science and Technology, Bp 676, Centre Urbain Nord, 1080 Charguia Cedex, Tunisia. Electronic address: ndbohli@gmail.com.
2
Université de La Réunion, INSERM, UMR 1188 Diabète athérothrombose réunion Océan Indien (DéTROI), Saint-Denis de La Réunion, France; CHU de La Réunion, Saint-Denis de La Réunion, France.
3
Université de La Réunion, INSERM, UMR 1188 Diabète athérothrombose réunion Océan Indien (DéTROI), Saint-Denis de La Réunion, France.
4
Carthage University, UR17ES22 Research Unit of Nanobiotechnology and Valorisation of Medicinal Plants, National Institute of Applied Science and Technology, Bp 676, Centre Urbain Nord, 1080 Charguia Cedex, Tunisia.
5
Université Paris13, Inserm, U1148, Laboratory for Vascular Transitional Science, Institut Galilée, Sorbonne Paris Cité, F-93430 Villetaneuse, France.

Abstract

In this paper we propose an easy way to detect the glycated form of human serum albumin which is biomarker for several diseases such as diabetes and Alzheimer. The detection platform is a label free impedimetric immunosensor, in which we used a monoclonal human serum albumin antibody as a bioreceptor and electrochemical impedance as a transducing method. The antibody was deposited onto a gold surface by simple physisorption technique. Bovine serum albumin was used as a blocking agent for non-specific binding interactions. Cyclic voltammetry and electrochemical impedance spectroscopy were used for the characterization of each layer. Human serum albumin was glycated at different levels with several concentrations of glucose ranging from 0 mM to 500 mM representing physiological, pathological (diabetic albumin) and suprapathological concentration of glucose. Through the calibration curves, we could clearly distinguish between two different areas related to physiological and pathological albumin glycation levels. The immunosensor displayed a linear range from 7.49% to 15.79% of glycated albumin to total albumin with a good sensitivity. Surface plasmon resonance imaging was also used to characterize the developed immunosensor.

KEYWORDS:

Electrochemical impedance spectroscopy; Glycated albumin; Immunosensor; SPRi

PMID:
29674076
DOI:
10.1016/j.talanta.2018.03.027
[Indexed for MEDLINE]

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