AI Article Synopsis
- Starch has a complex, semi-crystalline structure, influencing its properties in food and bioplastics, and various methods, including FTIR, are used to analyze it.
- The study analyzes 61 starch samples and finds that while FTIR can detect changes in molecular order related to hydration, the relationship between FTIR peaks and starch structure is non-linear and complex.
- The research shows that FTIR effectively examines short-range interactions in starch, but the assumption of simple linear relationships in this context is not accurate.
Article Abstract
Starch has a heterogeneous, semi-crystalline granular structure and the degree of ordered structure can affect its behaviour in foods and bioplastics. A range of methodologies are employed to study starch structure; differential scanning calorimetry, (13)C nuclear magnetic resonance, X-ray diffraction and Fourier transform infrared spectroscopy (FTIR). Despite the appeal of FTIR as a rapid, non-destructive methodology, there is currently no systematically defined quantitative relationship between FTIR spectral features and other starch structural measures. Here, we subject 61 starch samples to structural analysis, and systematically correlate FTIR spectra with other measures of starch structure. A hydration dependent peak position shift in the FTIR spectra of starch is observed, resulting from increased molecular order, but with complex, non-linear behaviour. We demonstrate that FTIR is a tool that can quantitatively probe short range interactions in starch structure. However, the assumptions of linear relationships between starch ordered structure and peak ratios are overly simplistic.
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| http://dx.doi.org/10.1016/j.carbpol.2015.11.066 | DOI Listing |
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