The demand for clean-label starch, perceived as environmentally friendly in terms of production and less hazardous to health, has driven the advancement of food physical processing technologies aimed at modifying starch. One of the key objectives of these modifications has been to reduce the glycaemic potency and increase resistant starch content of starch, as these properties have the potential to positively impact metabolic health. This review provides a comprehensive overview of recent updates in typical physical processing techniques, including annealing, heat-moisture, microwave and ultrasonication, and a brief discussion of several promising recent-developed methods. The focus is on evaluating the molecular, supramolecular and microstructural changes resulting from these modifications and identifying targeted structures that can foster enzyme-digestion resistance in native starch and its forms relevant to food applications. After a comprehensive search and assessment, the current physical modifications have not consistently improved starch enzymatic resistance. The opportunities for enhancing the effectiveness of modifications lie in (1) identifying modification conditions that avoid the intensive disruption of the granular and supramolecular structure of starch and (2) exploring novel strategies that incorporate multi-type modifications.
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