Influence of glycerol monostearate on structural organization and digestibility of pea starch processed by superheated steam extrusion
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Published on: January 17, 2017
Xingmei Sheng1, Junjie Yi1, Huang Zhang2
1Faculty of Food Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China; Yunnan Key Laboratory of Plateau Food Advanced Manufacturing, Kunming, 650500, China; Yunnan International Joint Laboratory of Green Food Processing, Kunming, 650500, China.
Abstract:
Pea starch exhibits limited structural stability and poorly controlled digestibility, restricting its application in functional foods. This study investigated the combined effects of superheated steam (SST), twin-screw extrusion, and glycerol monostearate (GMS) on pea starch structure and digestibility. FTIR showed increased 1047/1022 cm-1 absorbance ratio (0.809 → 1.001-1.110), indicating enhanced short-range molecular order. XRD revealed partial V-type crystalline formation (crystallinity 0.112-0.230). SEM and CLSM demonstrated granular disruption and pseudo-granular assemblies with GMS addition. In vitro assays showed reduced rapidly digestible starch (33.60% → 13.20%) and slower hydrolysis kinetics (rate constant 4.9 → 3.2 × 10-2 min-1). These results highlight the synergistic effect of SST-extrusion-GMS treatment in reorganizing starch into an enzyme-resistant architecture, providing a strategy to design legume-based ingredients with tailored digestibility. This integrated approach provides an effective strategy for tailoring pea starch structure and nutritional functionality, facilitating the design of legume-based ingredients with controlled digestibility.
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