Electroanalysis of the interaction between (-)-epigallocatechin-3-gallate (EGCG) and amyloid-β in the presence of copper.

The misfolding of amyloid-beta (Aβ) peptide is one of the pathological hallmarks of Alzheimer's disease (AD). Polyphenols are strong antioxidants and metal chelators, with characteristics that are of beneficial therapeutic values for their development as candidates targeting neurodegenerative and metal-induced diseases. We have demonstrated here the electrochemical properties of a green tea component, (-)-epigallocatechin-3-gallate (EGCG), and its potent activity on Aβ peptides.

Tattoo-based potentiometric ion-selective sensors for epidermal pH monitoring.

This article presents the fabrication and characterization of novel tattoo-based solid-contact ion-selective electrodes (ISEs) for non-invasive potentiometric monitoring of epidermal pH levels. The new fabrication approach combines commercially available temporary transfer tattoo paper with conventional screen printing and solid-contact polymer ISE methodologies. The resulting tattoo-based potentiometric sensors exhibit rapid and sensitive response to a wide range of pH changes with no carry-over effects.

Disposable immunochips for the detection of Legionella pneumophila using electrochemical impedance spectroscopy.

The rapid diagnosis of Legionellosis is crucial for the effective treatment of this disease. Currently, most clinical laboratories utilize rapid immunoassays that are sufficient for the detection of Legionella serogroup 1, but not other clinically relevant serogroups. In this report, the development of a disposable immunochip system is described in connection with electrochemical impedance spectroscopy and fluorescence microscopy.

Electrochemical oxidation of benzothiazole dyes for monitoring amyloid formation related to the Alzheimer's disease.

Alzheimer's disease (AD) is associated with the formation and deposition of amyloid fibrils. A better understanding of the oligomeric intermediates on the pathway to fibrilization is highly desired, but efficient methods for their detection are lacking. We have studied the interfacial properties of amyloid peptides (Abeta-40 and Abeta-42) and the course of their aggregation in vitro in the presence of the benzothiazole dyes Thioflavin T (4-(3,6-dimethyl-1,3-benzothiazol-3-ium-2-yl)-N,N-dimethylaniline) chloride, ThT) and BTA-1 ([2-(4'-(methylamino)phenyl) benzothiazole]) using electrochemical techniques.