Infrared spectroscopic analysis for agricultural materials and its application
2003
Kameoka, T. (Mie Univ., Tsu (Japan). Faculty of Bioresources) | Hashimoto, A.
Summary Optical sensing in agriculture is very powerful because it gets all information of agricultural products on physical and chemical level. In this paper, however, we deal with only mid-infrared (MIR) spectroscopy. Theoretically speaking, mid-infrared spectroscopy has more advantages on the spectral information than nearinfrared one, while it has been very difficult to extract the solute spectrum from the water solution such as foods and agricultural products of high moisture content because of the strong absorption of MIR radiation by water. In parallel with the development of Fourier transform infrared (FT-IR) technology, various sampling techniques: attenuated total reflection (ATR), diffuse reflection, and photoacoustic methods, have been developed. Especially the FT-IR/ATR method has substantial potential as a qualitative and quantitative analytical tool for food processing. In this review, recent developments in mid-infrared spectroscopy, focusing on FT-IR/ATR method, have been taken. As an overview of the spectroscopic research on sugars, fundamental research on both the qualitative and quantitative analysis of foods and agricultural products has been reviewed. In addition, this paper also reviews some applications of FT-IR/ATR methods to monitoring metabolism during cultivation process. These works shows an important first step toward the development of nonintensive on-line monitoring devices for food processing and bioprocesses. Furthermore, we survey the importance of infrared spectroscopic characteristics of foods in order to evaluate the effects when infrared irradiation is applied to the thermal operations of food process such as heating and drying.
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