Comparing the light response of D-glucose in polyacrylamide hydrogel and water in NIR spectral region by using an LED based portable device.


Özdemir O. B. , Gelir A., Özdemir S., Kadı Ö. F. , Seyhan S. N. , Yıldırım K. B.

OPTICAL AND QUANTUM ELECTRONICS, vol.55, no.30, pp.1-13, 2022 (SCI-Expanded)

  • Publication Type: Article / Article
  • Volume: 55 Issue: 30
  • Publication Date: 2022
  • Doi Number: 10.1007/s11082-022-04123-7
  • Journal Name: OPTICAL AND QUANTUM ELECTRONICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Page Numbers: pp.1-13
  • Istanbul Technical University Affiliated: Yes

Abstract

The spectral properties of the molecules depend on the matrix in which it is present. The
interaction of the molecule with the solute molecules affects the vibrational and rotational
modes of the molecule. In this study, an absorption-based system was designed to show how
the absorbance properties of glucose change in polyacrylamide hydrogel, and the measurements
were performed at different wavelengths; 960 nm, 1450 nm, 1550 nm, and 1950 nm. It was
observed that the system is sensitive to glucose at 1450 nm and 1950 nm wavelengths in
polyacrylamide hydrogel, whereas it is only sensitive at 1450 nm in water which is due to the
high absorbance of water at 1950 nm. In polyacrylamide hydrogel, water molecules mostly
gather around the polymer chains via electrostatic interactions and the absorbance of water
decreases which results in an increasing absorbance of glucose. According to the results, the
responsivity of the system at 960 nm and 1550 nm, which are the wavelengths commonly used
LED-based systems for measuring glucose in literature, is not high enough for reliable glucose
measurements when compared with 1450 nm and 1950 nm.