Ultrasensitive Impedimetric Biosensor Fabricated by a New Immobilisation Technique for Parathyroid Hormone

Abstract

This paper presents a novel ultrasensitive and rapid impedimetric biosensor with new immobilisation materials for parathyroid hormone (PTH) with the aim to determine the PTH level in serum for the diagnosis and monitoring of parathyroid diseases such as hyperparathyroidism, adenoma, and thyroid cancer. The interaction between PTH and the biosensor was investigated with an electrochemical method. The biosensor was based on the gold electrode modified by mercaptohexanol (6-MHL). Anti-parathyroid hormone (anti-PTH) was covalently immobilised onto a self-assembled monolayer (SAM) by using epiclorhidrina (EPI) with ethanolamine (EA). The EPI-EA interaction represents the first use of these for the construction of biosensors in published reports. The immobilisation of the anti-PTH was monitored by electrochemical impedance spectroscopy, cyclic voltammetry and scanning electron microscopy (SEM) techniques. After the optimisation studies of immobilisation materials such as 6-MHL, EPI, EA and glutaraldehyde, linearity, repeatability and sensitivity of biosensor were evaluated as the performance of biosensor. PTH was detected within a linear range of 0.1-0.6 pg/ml, and the detection limit was 0.1 fg/ml. The specificity of the biosensor was also investigated. Finally, the described biosensor was used to detect the PTH levels in artificial serum samples.

Electrochemical Methods for the Analysis of Clinically Relevant Biomolecules

“…A variety of electrochemical sensors have been developed for the detection of many hormones, such as testosterone, androsterone, cortisol, 17-α-ethinyl estradiol, 17-β-estradiol, estrogen, progesterone, norethisterone, human growth hormone, parathyroid hormone, thyroxine, thyroid-stimulating hormone, adrenocorticotropic hormone, prolactin, vasopressin, procalcitonin, insulin, epinephrine, norepinephrine, human chorionic gonadotropin, insulin-like growth factor, and B-type natriuretic peptide . However, the last five hormones were discussed in the Neurotransmitters and Tumor Markers and Inflammatory Markers sections.…”

An ultrasensitive electrochemical immunosensor platform based on disposableITO electrode modified by 3-CPTMS for early detection of parathyroid hormone

“…The EPI-EA interaction represents the first use of these for the construction of biosensors in published reports. PTH was detected within a linear range of 0.1-0.6 pg/mL, and the detection limit was 0.1 fg/mL [24].…”