In vitro starch digestion of flat dough pieces with and without fiber

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2022-2-09

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Güler, Nilay

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The digestive behavior of starch, which supplies most of our daily energy needs, is vital for health. Starch-rich foods that provoke a high glycemic response are alterable risk factors for obesity, type-2 diabetes, and cardiovascular disease. Therefore, it is crucial to promote staple foods that provide a controlled glucose release in the blood. Incorporating different cooking methods and dietary fiber into regularly eaten products is a food design strategy that leads to several advantages to decrease chronic disease by changing starch digestibility. This study aimed to investigate the effect of psyllium fiber addition on in vitro starch digestibility of steamed and roasted wheat-based flat dough pieces. Doughs were prepared as control and fiber-enriched samples, where wheat flour was replaced with 10 % psyllium fiber. Specimens were steamed at 100˚C for two different times (2 min and 10 min) and roasted for 2 min at two different temperatures (100˚C and 250˚C) separately. Fiber addition significantly lowered rapidly digestible starch (RDS) fractions in steamed and roasted samples. Adding psyllium fiber increased the SDS fractions for only the samples roasted at 100 °C and samples steamed for 2 min. Roasted samples had a lower RDS fraction than the steamed samples only for the fiber added samples. This study showed that processing method, time, temperature, and psyllium fiber addition affected in vitro starch digestion. The processing method could alter the starch gelatinization, development of the gluten network, and structure. Then, this structure and psyllium fiber could affect the enzyme’s accessibility to the substrates.

Subject Keywords

Psyllium Fiber, Roasting, Steaming, Starch Digestibility

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https://hdl.handle.net/11511/96809

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

N. Güler, “In vitro starch digestion of flat dough pieces with and without fiber,” M.S. - Master of Science, Middle East Technical University, 2022.