Screening and Determinations of Tissue Polypeptide Antigen by Label-Free Optical Immunosensing Method
Abstract:Based on the specificity of the immunoreaction of anti-body and antigen, and the resulting localized surface plasmon resonance extinction response of functionalized nano-Au monolayer on glass chip, a novel label-free optical immunosensor with amplified sensitivity has been developed for the detection of tissue polypeptide antigen (TPA). The nano-Au monolayer on glass chip was controllably prepared using 3-mercaptopropyltrimethoxysilane (MPTMOS) as linker by a solution self-assembly method. To analyze its quality, the nano-Au monolayer was characterized by UV-visible spectrum and atomic force microscopy (AFM). The resulting chip was modified by tissue polypeptide antigen antibody (anti-TPA), and then bovine serum albumin (BSA) was employed to block the possible remaining active sites of the nano-Au monolayer. An immunosensor was constructed with biocompatible monolayer nano-Au membrane and the desirable TPA antibody/BSA composite membrane, and it showed good selectivity, high sensitivity and a wide linear response to TPA in the range of 1–1000 ng L−1 with a detection limit of 1.2 × 10−3 ng L−1, as well as good stability and long-term life. Owing to its ease of operation, low detection limit and low cost, it is expected that the proposed procedure may hold great promise in both research-based and clinical assays.
Document Type: Research Article
Publication date: 2012-01-01
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