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Nature-Inspired Adhesive Catecholamine for Colorimetric Bioassays

Title
Nature-Inspired Adhesive Catecholamine for Colorimetric Bioassays
Authors
Kim, Seunghwi
DGIST Authors
Kim, Seunghwi; Hong, SeonkiSeo, Daeha
Advisor(s)
홍선기
Co-Advisor(s)
Seo, Daeha
Issue Date
2020
Available Date
2020-08-06
Degree Date
2020/08
Type
Thesis
Description
Biomarker, Catecholamine, Melanogenesis, Adhesive colorant, Colorimetric assay
Abstract
Biomarkers are biological indicators of specific pathological conditions. By monitoring biomarkers, early disease diagnosis, and immediate treatment are possible. In conventional biomarker detection methods, complex protocols, additional equipment, and trained personnel are essential, limiting its application to a laboratory setting. Therefore, the colorimetric bioassay, which generates a visible signal in the presence of a target biomarker, has attracted attention. However, limitations of this assay type include low sensitivity and/or diffusion of the colorant resulting in the loss of spatial information. To address this limitation, we developed an enzyme-mediated adhesive colorant (EAC) platform. Unlike previous biomarker detection platforms that require additional equipment for the readout, in the EAC platform, pyrocatechol (PC) is oxidized/polymerized by horseradish peroxidase (HRP) to generate a colorimetric signal that can be detected with the naked eye. As a large number of PC are oxidized by a single HRP, signal amplification occurs. In addition, the chemical structure of the colorant is similar to polydopamine, a well-known universal surface adhesive, resulting in a unique adhesion property. That is, the generated adhesive colorant is attached in the vicinity of the HRP labeled target, allowing spatial analysis of the target. The broad use of the EAC platform was confirmed by applying the protocol to single-cell staining assays and paper-based bioassays.
Table Of Contents
I. INTRODUCTION II. EXPERIMENTAL SECTION III. RESULTS AND DISCUSSION 3.1 Advantage of enzyme-mediated adhesive colorant (EAC) platform 3.2 Catechol oxidation via representative oxidases 3.3 Colorant generation of potential adhesive colorants 3.4 Limitations of conventional colorimetric bioassay using TMB 3.5 Adhesive property of potential adhesive colorant 3.6 EAC platform for ELISA 3.7 Single cell staining using adhesive colorant 3.8 EAC platform for paper-based bioassays IV. CONCLUSION V. REFERENCE
URI
http://dgist.dcollection.net/common/orgView/200000320753
http://hdl.handle.net/20.500.11750/12173
DOI
https://doi.org/10.22677/thesis.200000320753
Degree
Master
Department
Department of Emerging Materials Science
University
DGIST
Related Researcher
  • Author Hong, Seonki Biomaterials & Biointerface Engineering Laboratory
  • Research Interests Bio-inspired organic materials; Polymeric biomaterials; Surface biofunctionalization; biochip fabrication
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Collection:
Department of Emerging Materials ScienceThesesMaster


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