Real-Time Monitoring of Trastuzumab Monoclonal Antibodies Using Electrochemical Aptamer-Based Sensors.

Authors

Wei Foo, Xieshi Zhang, S Maya Vanichakorntanes, Ya-Chen Tsai, Jun-Chau Chien

Published in

ACS sensors. Jun 18, 2026. Epub Jun 18, 2026.

Abstract

The real-time monitoring of trastuzumab (Tmab), a monoclonal antibody used for cancer treatment, is critical for personalized, response-guided dosing and improved biomanufacturing quality control. Currently, Tmab concentrations are quantified using immunoassays and mass spectrometry, but these platforms provide only discrete measurements and require extensive sample preparation. Surface-tethered electrochemical aptamer-based (E-AB) sensors provide a unique alternative because they operate without free-floating reagents, enable continuous measurements, and can be engineered to achieve high sensitivity and specificity. However, using E-AB sensors to detect macromolecules such as antibodies, rather than small molecules, requires careful consideration of surface-induced steric hindrance effects. In this work, we present a surface-functionalized Tmab-targeting E-AB sensor with optimized surface density and square-wave voltammetry frequency. The Tmab E-AB sensor employs a linked displacement strand construct and achieves K_D = 70.8 nM and LoD = 0.66 nM at an estimated surface density of 15 molecules/mm² × 10^-9. We further study the use of active and passive refresh techniques to enable continuous and quasi-continuous monitoring and demonstrate direct sensing in human serum and cell culture media.

PMID:
42315975
Bibliographic data and abstract were imported from PubMed on 19 Jun 2026.

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