期刊
ACS NANO
卷 10, 期 1, 页码 723-729出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b05781
关键词
electron beam lithography; antibody patterning; trehalose glycopolymer; biosensor; localized surface plasmon resonance; dark-field microscopy
类别
资金
- Center for Scalable and Integrated NanoManufacturing (SINAM) [CMMI-0751621]
- NIH Chemistry Biology Interface Training Program [T32 GM 008496]
- NIH Biotechnology Training Grant [T32 GM067555]
- Swiss National Science Foundation [PBEZP2-133211]
- Netherlands Organization for Scientific Research
- Marie Curie Cofund Action (Rubicon Grant) [680-50-1101]
- Swiss National Science Foundation (SNF) [PBEZP2-133211] Funding Source: Swiss National Science Foundation (SNF)
Simultaneous detection of multiple biomarkers, such as extracellular signaling molecules, is a critical aspect in disease profiling and diagnostics. Precise positioning of antibodies on surfaces, especially at the micro- and nanoscale, is important for the improvement of assays, biosensors, and diagnostics on the molecular level, and therefore, the pursuit of device miniaturization for parallel, fast, low-volume assays is a continuing challenge. Here, we describe a multiplexed cytokine immunoassay utilizing electron beam. lithography and a trehalose glycopolymer as a resist for the direct writing of antibodies on silicon substrates, allowing for micro- and nanoscale precision of protein immobilization. Specifically, anti-interleukin 6 (IL-6) and antitumor necrosis factor alpha (TNF alpha) antibodies were directly patterned. Retention of the specific binding properties of the patterned antibodies was shown by the capture of secreted cytokines from stimulated RAW 264.7 macrophages. A sandwich immunoassay was employed using gold nanoparticles and enhancement with silver for the detection and visualization of bound tytokines to the patterns by localized surface plasmon resonance detected with dark-field microscopy. Multiplexing with both IL-6 and TNF alpha on, a single chip was also successfully demonstrated with high specificity and in relevant cell culture conditions and at different times after cell stimulation. The direct fabrication of capture antibody patterns for cytokine detection described here could be useful for biosensing applications.
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