Multifunctionalized reduced graphene oxide biosensors for simultaneous monitoring of structural changes in amyloid-β 40

Dahye Jeong, Jinsik Kim, Myung Sic Chae, Wonseok Lee, Seung Hoon Yang, Youngsoo Kim, Seung Min Kim, Jin San Lee, Jeong Hoon Lee, Jungkyu Choi, Dae Sung Yoon, Kyo Seon Hwang

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Determination of the conformation (monomer, oligomer, or fibril) of amyloid peptide aggregates in the human brain is essential for the diagnosis and treatment of Alzheimer’s disease (AD). Accordingly, systematic investigation of amyloid conformation using analytical tools is essential for precisely quantifying the relative amounts of the three conformations of amyloid peptide. Here, we developed a reduced graphene oxide (rGO) based multiplexing biosensor that could be used to monitor the relative amounts of the three conformations of various amyloid-β 40 (Aβ40) fluids. The electrical rGO biosensor was composed of a multichannel sensor array capable of individual detection of monomers, oligomers, and fibrils in a single amyloid fluid sample. From the performance test of each sensor, we showed that this method had good analytical sensitivity (1 pg/mL) and a fairly wide dynamic range (1 pg/mL to 10 ng/mL) for each conformation of Aβ40. To verify whether the rGO biosensor could be used to evaluate the relative amounts of the three conformations, various amyloid solutions (monomeric Aβ40, aggregated Aβ40, and disaggregated Aβ40 solutions) were employed. Notably, different trends in the relative amounts of the three conformations were observed in each amyloid solution, indicating that this information could serve as an important parameter in the clinical setting. Accordingly, our analytical tool could precisely detect the relative amounts of the three conformations of Aβ40 and may have potential applications as a diagnostic system for AD.

Original languageEnglish
Article number1738
JournalSensors (Switzerland)
Volume18
Issue number6
DOIs
Publication statusPublished - 2018 Jun

Bibliographical note

Funding Information:
Funding: The authors are grateful for financial support from Kyung Hee University in 2017 (KHU-20171744), the Korea Health Industry Development Institute (KHIDI, grant no. HI14C3319), National Research Foundation of Korea (NRF, grant no. NRF-2017M3A9E2058046 & NRF-2016R1A2B4010269), Korea Institute of Industrial Technology (Project No. EO170047) and Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology (2015R1A6A3A04058568).

Publisher Copyright:
© 2018 by the authors. Licensee MDPI, Basel, Switzerland.

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering

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