Monday , October 22

18MPMOLEC: Mon. Posters: Molecular (IR, NIR) Spectroscopy

Location: Imperial B
11:00 am
Development of SPR-NIR Spectroscopy for Highly Diluted Solutions in a nano Litter Scale
A new concept for microanalysis outperforming classical NIR spectroscopy will be introduced
Kodai Murayama1, Takuma Genkawa2, Ichiro Tanabe3, Aiko Miyamoto2, Yuki Hanase4, Fumie Watanabe1, Nobuhiro Tomosada1, Yukihiro Ozaki4; 1Yokogawa Electric Corporation, 2University of Tsukuba, 3Osaka University, 4Kwansei Gakuin University
Poster Number: 100
Microanalysis technologies are constantly being sought in various fields such as foods, pharmaceuticals, medicine, and environment, and various spectroscopic technologies are the most promising as nondestructive analysis methods. In particular, near-infrared (NIR) spectroscopy has advantages as a simple, compact, and low-cost analytical technology, but it is ill-suited to microanalysis because of its low absorptivity. The present study focuses on a highly sensitive detection by NIR spectroscopy, based on absorption-sensitive surface plasmon resonance (SPR). SPR-NIR spectroscopy is based on the internal reflection measurement method called Kretschmann arrangement, and a flat gold thin film is formed on the prism. Due to the electric field enhancement by SPR, the absorbance of the sample on the thin film of gold is enhanced about 100 times more than the absorbance of conventional attenuated total reflection NIR spectra. The enhanced NIR spectra of ethylene glycol aqueous solutions were acquired, which are minute solution samples with varying concentrations, and the lower quantification limit was calculated using chemometrics. Herein we showed that this method can estimate concentration of component having sample volume of 10 nL or less.