Simple and Label-Free Liquid Crystal-based Optical Sensor for Highly Sensitive and Selective Endotoxin Detection by Aptamer Binding and Separation
- Authors
- An, Zongfu; Jang, Chang-Hyun
- Issue Date
- 31-Jan-2019
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- lipopolysaccharide; liquid crystal; 4-cyano-4 ' -pentylbiphenyl; optical biosensors; polarized optical microscope
- Citation
- CHEMISTRYSELECT, v.4, no.4, pp.1416 - 1422
- Journal Title
- CHEMISTRYSELECT
- Volume
- 4
- Number
- 4
- Start Page
- 1416
- End Page
- 1422
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/1958
- DOI
- 10.1002/slct.201803774
- ISSN
- 2365-6549
- Abstract
- Lipopolysaccharides (LPS), also commonly known as lipoglycans and endotoxins, can often accidentally contaminate recombinant protein therapeutics and bacteria-derived plasmid DNA vaccines. Since LPS can induce fever, hypotension, shock, and even death, their early and sensitive detection is necessary in relevant bioassays and for parenteral drug administration and/or biotherapeutics. In this study, an optical biosensor was developed using LPS-specific single-stranded DNA aptamers as LPS-selective probes. (3-Aminopropyl) triethoxysilane and glutaraldehyde were used as linkers to immobilize the LPS high-affinity aptamer on glass. Subsequently, each modification step was characterized by the optical responses obtained from liquid crystals using a polarized optical microscope. The sensor's ability to detect LPS was confirmed using a broad LPS detection range (5.5 pg/mL - 100 ng/mL). Despite the presence of plasmid DNA, RNA, and bovine serum albumin, the aptamer sensor showed high selectivity for LPS and could be regenerated for reuse at a low pH, thus, providing a promising option for detecting LPS in complex, low pH environments.
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