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2-Furaldehyde (2-FAL) is a furan compound that can be found in various environmental and food contexts, including food, wine, and milk. It is often analyzed as a quality marker, but its potential health risks make it a concern. In industrial liquids, like natural esters, which are used in oil-filled transformers, 2-FAL concentrations can be high due to insulating paper degradation, making it essential to monitor solid insulation. An SPR optical sensor has been previously reported for this aim. It is based on a plastic optical fiber and a sensing receptor for 2-FAL, specifically a Molecular Imprinted Polymer layer, which directly performs in the ester matrix. However, natural ester is also subjected to hydrolysis, releasing fatty acids. In this work, as a first step, the response of the SPR sensors to 2-FAL in standard solutions of virgin ester and in the presence of different stearic acid content has been investigated. It turns out that the response to 2-FAL only varies with high levels of fatty acid, which are typical for an oil that has lost its functionality.

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Detection of 2-Furaldehyde in Transformer Oil in the Presence of Fatty Acids by SPR Sensor Modified with Molecularly Imprinted Polymer

  • 会议论文

  • 发表日期：

    2025年

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  • S. Prosperi,
  • L. De Maria,
  • D. Merli,
  • G. Alberti

摘要

2-Furaldehyde (2-FAL) is a furan compound that can be found in various environmental and food contexts, including food, wine, and milk. It is often analyzed as a quality marker, but its potential health risks make it a concern. In industrial liquids, like natural esters, which are used in oil-filled transformers, 2-FAL concentrations can be high due to insulating paper degradation, making it essential to monitor solid insulation. An SPR optical sensor has been previously reported for this aim. It is based on a plastic optical fiber and a sensing receptor for 2-FAL, specifically a Molecular Imprinted Polymer layer, which directly performs in the ester matrix. However, natural ester is also subjected to hydrolysis, releasing fatty acids. In this work, as a first step, the response of the SPR sensors to 2-FAL in standard solutions of virgin ester and in the presence of different stearic acid content has been investigated. It turns out that the response to 2-FAL only varies with high levels of fatty acid, which are typical for an oil that has lost its functionality.