Hg(II) Raman Sensor of Poly-L-Lysine Conformation Change on Gold Nanoparticles
- Authors
- Ly, Nguyen Hoang; Joo, Sang-Woo
- Issue Date
- 20-Dec-2014
- Publisher
- KOREAN BIOCHIP SOCIETY-KBCS
- Keywords
- Raman sensor; Hg(II); Gold nanoparticles; Poly-L-lysine; Conformational change
- Citation
- BIOCHIP JOURNAL, v.8, no.4, pp.303 - 309
- Journal Title
- BIOCHIP JOURNAL
- Volume
- 8
- Number
- 4
- Start Page
- 303
- End Page
- 309
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/9863
- DOI
- 10.1007/s13206-014-8409-3
- ISSN
- 1976-0280
- Abstract
- In order to develop optical Hg(II) sensors, the adsorption characteristics of poly-L-lysine (PLL) after the conjugation of various ions on gold nanoparticles (AuNPs) were examined by means of Raman spectroscopy, UV-Vis absorption, and quasi-elastic light scattering (QELS). The intensities of the two bands at 458 and 1115 cm(-1) appeared to decrease, in comparison with that at 1150 cm(-1) in the presence of 100 mu M of Hg(II). The other ions of Cr3+, Pb2+, Mn2+, Zn2+, Co2+, Ni2+, Cd2+, Fe2+, Na+, K+, Ca2+, Mg2+, Cu2+, NH4+, and Fe3+ did not show such spectral changes. The prominent band at 1150 cm(-1), which may be ascribed to the C-N or gamma (NH3+) band, suggests that a conformational change of poly-L-lysine (PLL) occurs after its interaction with Hg(II) ions. The Hg(II) concentration-dependent SERS spectra indicated that the relative intensities of the two bands at 458 and 1115 cm(-1) decreased and that at 1150 cm(-1) increased above 1 mu M. These vibrational fingerprints may be useful to discriminate the Hg(II) ion above 1 mu M using AuNPs and Raman spectroscopy. On the basis of the presented spectroscopic study, we plan to develop an efficient method of detecting the Hg(II) ion at lower concentrations by introducing a variety of SERS platforms.
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