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Updated: May 31, 2026
Photopatterning Proteins and Cells in Aqueous Environment Using TiO2 Photocatalysis
Published on: October 26, 2015
Photoelectrochemical Biosensor Based on TiO2/P5FIn with a Cascade Amplification Strategy for Simultaneous Detection
Lu Zhang1, Dandan Liu1, Aoze Wang1
1Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P R China.
Abstract:
In this work, a photoelectrochemical (PEC) sensor for ovarian cancer detection was constructed based on TiO2/poly(5-formylindole) (P5FIn)heterojunction using cascade amplification. The combined detection of multiple markers instead of a single detection mode can improve diagnostic accuracy. The photoelectron conversion efficiency and photocurrent response were significantly improved by the reaction of the detector glutathione (GSH) with cystine. 17β-Estradiol (E2) had a negative effect on the PEC response, reducing the photocurrent signal, and ultimately realizing the sensitive detection of GSH and E2. The PEC sensor had good detection performance for GSH and E2, with a linear detection range (LDR) of 0.5-1000 μM, and the limits of detection (LOD) were 0.167 μM and 0.1224 pM, respectively, with a detection range of 0.0003671-36.71 nM. Meanwhile, the PEC sensor also has good analytical capability, and this cascade signal amplification strategy has a potential development prospect in disease detection.
