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Determination of soluble CD44 in serum by using a label-free aptamer based electrochemical impedance biosensor

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Abstract

CD44 is a promising biomarker in the diagnosis and prognosis of malignancies. The serum CD44 level is closely related to disease progression and metastasis of malignancies. It is of great clinical significance for the detection of serum soluble CD44. In this study, a facile, label-free aptamer based electrochemical impedance sensor for serum CD44 has been proposed. The aptamer showing high affinity to CD44 was immobilized on the gold electrodes through Au–S interaction. The interaction between target CD44 and the immobilized aptamer will cause a complex structure change of the aptamer, which makes the diffusion of [Fe(CN)6]3−/4− toward the electrode surface easy, thus resulting in the decrease of the impedance of the system. The decreased degree of the impedance had a good linear relationship with the logarithm of the CD44 concentration in the range of 0.1–1000 ng mL−1 with a detection limit of 0.087 ng mL−1 (S/N = 3). The developed biosensor has been applied to detect CD44 in serum samples with satisfactory results.

Graphical abstract: Determination of soluble CD44 in serum by using a label-free aptamer based electrochemical impedance biosensor

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Publication details

The article was received on 08 Sep 2019, accepted on 07 Nov 2019 and first published on 08 Nov 2019


Article type: Paper
DOI: 10.1039/C9AN01764J
Analyst, 2020, Advance Article

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    Determination of soluble CD44 in serum by using a label-free aptamer based electrochemical impedance biosensor

    J. Zhou, K. Cheng, X. Chen, R. Yang, M. Lu, L. Ming, Y. Chen, Z. Lin and D. Chen, Analyst, 2020, Advance Article , DOI: 10.1039/C9AN01764J

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