Use of FT-IR spectroscopy as a tool for the analysis of polysaccharide food additives |
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Authors: | Marcela ern , Ant nio S. Barros, Alexandra Nunes, Sí lvia M. Rocha, Ivonne Delgadillo, Jana opí kov ,Manuel A. Coimbra |
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Affiliation: | a Department of Carbohydrate Chemistry and Technology, Institute of Chemical Technology, Technická 5, 166 28, Prague, Czech Republic b Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal |
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Abstract: | This work purposes the characterisation of food additive polysaccharides such as starch, glucomannan and carrageenan by the use of the information of the principal components of the FT-IR spectra in the 1200–800 cm−1 wavenumber region. The application of a PCA to this spectral region showed that several features could be obtained: (a) Separation between Glc and Gal, both monomeric and polymeric, and identification of their characteristic wavenumbers. (b) Identification of the specific absorbance wavenumbers for sucrose, Fru, Ara, and Man. (c) Distinction of pectic polysaccharides from the remaining carbohydrate samples. (d) Separation within κ-, ι-, and λ-carrageenans. These results show that the FT-IR spectroscopy in the 1200–800 cm−1 wavenumber region can be a very reliable technique for food authentication of polysaccharide-based additives and be used for a quick screening of polysaccharides used as additives in foodstuffs. |
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Keywords: | FT-IR spectroscopy Additives Glucan Carrageenan Pectin Additives Guican Carrageenan Pectin |
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