Effect of resistant starch on the physical properties and structure of wheat gel at different heating temperatures
2025
Ryoko Shimada | Miki Yoshimura
Background: The physical properties of resistant starch (RS) are similar to those of dietary fiber; thus, RS is often added to food products to provide the same health benefits as dietary fiber. Methods: In this study, four types of RS were mixed with wheat flour, and gels were prepared. RS-2, high amylose corn starch (HACS), was used alongside three types of RS-4: phosphate cross-linked tapioca starch (XLTS) and low- and high-hydroxypropylated phosphate tapioca starch (LHTS and HHTS, respectively). The flour suspension (16.7 w/w %) consisted of a mixture of medium wheat flour (1:1 mixture of low- and high-gluten wheat flour) and RS, combined in a 95:5 ratio. The suspension was heated at either 90 or 120 °C. The control sample consisted of wheat flour only. Compressive analysis, texture analysis, microscopic observations, RS measurements, and thermal properties analysis were performed. Results: The gel made with HACS was soft after heating at 90 °C, and this gel showed the highest RS content. Additionally, the control and HACS gels had increased RS content when heated at 120 °C. In contrast, while the physical properties of the RS-4 mixed gels (XLTS, LHTS, and HHTS) changed upon heating, the RS content did not increase in the gels heated at 120 °C. Therefore, the RS-4 mixed gels may inhibit wheat starch aging during retort cooking. Conclusions: These results indicate that mixing HACS into flour is the most effective way to increase the RS content in a water-dispersed flour system with high-moisture content, with higher heating temperatures facilitating this process.
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