Investigating the structural changes of ß-amyloid peptide aggregation using attenuated-total-reflection surface-enhanced Raman spectroscopy

K. C. Chiu, L. Y. Yu, J. N. Yih, Shean-Jen Chen*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

This study utilizes a surface-enhanced Raman spectroscopy (SERS) based on the attenuated-total-reflection (ATR) method to investigate that the structural information of the biomolecular monolayer on sensing surface can be dynamically observed with a higher signal-to-noise ratio signal. The secondary structures of long oligonucleotides and their influence on the DNA hybridization on the sensing surface are investigated. The SERS spectrum provides the structural information of the oligonucleotides with the help of a silver colloidal nanoparticle monolayer by control of the size and distribution of the nanoparticles adapted as a Raman active substrate. It is found that the ring-breathing modes of adenine, thymine, guanine, and cytosine in Raman fingerprint associated with three 60mer oligonucleotides with prominent secondary structures are lower than those observed for the two oligonucleotides with no obvious secondary structures. It is also determined that increasing the DNA hybridization temperature from 35°C to 45°C reduces secondary structure effects. The ATR-SERS biosensing technique will be used to provide valuable structural information regarding the short-term reversible interactions and long-term polymerization events in the Aβ aggregates on the sensing surface.

Original languageEnglish
Title of host publicationPlasmonics in Biology and Medicine IV
DOIs
StatePublished - 30 Apr 2007
EventPlasmonics in Biology and Medicine IV - San Jose, CA, United States
Duration: 23 Jan 200723 Jan 2007

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume6450
ISSN (Print)1605-7422

Conference

ConferencePlasmonics in Biology and Medicine IV
CountryUnited States
CitySan Jose, CA
Period23/01/0723/01/07

Keywords

  • DNA secondary structure
  • Metal nanoparticles
  • Structural change
  • Surface-enhanced Raman scattering

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    Chiu, K. C., Yu, L. Y., Yih, J. N., & Chen, S-J. (2007). Investigating the structural changes of ß-amyloid peptide aggregation using attenuated-total-reflection surface-enhanced Raman spectroscopy. In Plasmonics in Biology and Medicine IV [64500R] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 6450). https://doi.org/10.1117/12.701757