Authors: Jung, Youngeui; Hwang, Jungseek

Source: Applied Spectroscopy, Volume 67, Issue 2, Pages 36A-49A and 117-213 (February 2013) , pp. 171-180(10)

Publisher: Society for Applied Spectroscopy

Abstract:

We used near infrared spectroscopy to obtain concentration dependent glucose absorption spectra in aqueous solutions in the near-infrared range (3800-7500 cm⁻¹). Here we introduce a new method to obtain reliable glucose absorption bands from aqueous glucose solutions without measuring the water displacement coefficients of glucose separately. Additionally, we were able to extract the water displacement coefficients of glucose, and this may offer a new general method using spectroscopy techniques applicable to other water-soluble materials. We also observed red shifts in the absorption bands of water in the hydration shell around solute molecules, which comes from the contribution of the interacting water molecules around the glucose molecules in solutions. The intensity of the red shift gets larger as the concentration increases, which indicates that as the concentration increases more water molecules are involved in the interaction. However, the red shift in frequency does not seem to depend significantly on the concentration. We also performed the same measurements and analysis with sucrose instead of glucose as solute and compared.

Keywords: Near infrared spectroscopy; Water displacement coefficient; Glucose solution; Sucrose solution

Document Type: Research article

DOI: http://dx.doi.org/10.1366/12-06635

Affiliations: 1: Department of Physics, Pusan National University, Busan 609-735, Republic of Korea

Publication date: 2013-02-01

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