Author(s) Chen, H.; Shao, S.; Yu, Y.; Huang, Y.; Zhu, X.; Zhang, S.; Fan, J.; Yin, G.Yong; Chi, B.; Wan, M.; Mao, C.
Journal Anal Chim Acta
Date Published 2020 Jan 06

Simple and accurate detection of trace heavy metals in blood is very important. A novel dual-responsive electrochemical/fluorescent biosensor based on magnetic hyperbranched polyamide with heparin modification (MHPAM-H) for blood lead detection has been successfully developed. Upon conjugated with blood lead ions, dual-biosensor could not only display electrochemical signal but also fluorescence signal owing to the enriched amino groups, cavity structure, and good fluorescence properties of HPAM. Blood biocompatibility, construction of the dual-responsive biosensor, electrochemical/fluorescent detection of lead ions in water phase and blood condition, selectivity and stability of the dual-responsive biosensor were investigated in detail. The proposed dual-responsive biosensor displays good linear relationship (1.5 pM- 4.8 × 10 pM for electrochemical detection and 0.5 pM-4.8 × 10 pM for fluorescent detection) with low detection limit (4.4 pM for electrochemical detection and 1.0 pM for fluorescent detection) for blood lead, providing potential application for blood lead detection in the future.

DOI 10.1016/j.aca.2019.09.062
ISSN 1873-4324
Citation Anal Chim Acta. 2020;1093:131141.