Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Development of a Fluorescent Sensor Based on Resazurin and Hydrotalcite for the Determination of Ethanol in Alcoholic Beverages

  • Hong Dinh Duong (School of Chemical Engineering, Chonnam National University) ;
  • Juyeon Kim (School of Chemical Engineering, Chonnam National University) ;
  • Jong Il Rhee (School of Chemical Engineering, Chonnam National University)
  • Received : 2023.12.15
  • Accepted : 2024.01.23
  • Published : 2024.03.31
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Abstract

In this study, a fluorescent ethanol sensor is developed to determine the ethanol concentration in the liquid phase. The sensor is developed using a complex of resazurin (RA)/resorufin (RO) and a hydrotalcite (HT) catalyst in a sol-gel matrix of methyltrimethoxysilane (MTMS) to produce a fluorescent ethanol-sensing membrane (RA/RO*HT membrane). The operation mechanism of the RA/RO*HT membrane is based on (i) the oxidation of ethanol to acetaldehyde and (ii) the reduction of RA to RO, through electron flows followed by EtOH ↔ HT ↔ RA/RO ↔ EtOH interactions. These possible redox reactions can lead to an increased fluorescence intensity of the RA/RO*HT membrane as the ethanol concentration increases. The RA/RO*HT membrane shows a linear detection range of 1-20 vol.% EtOH with limit of detection (LOD) of 0.178%. Additionally, the RA/RO*HT membrane has high sensitivity and accuracy for determining the alcohol content in several Korean alcoholic beverages.

Keywords

Acknowledgement

This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (NRF2019R1I1A3A01057222).

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