Comparative effects of four types of resistant starch on the techno-functional properties of low-fat meat emulsions

The behavior of resistant starch (RS) in meat matrix depends largely on its type. Hence, the comparative impacts of high amylose corn starch (RS2), retrograded starch (RS3), acetylated starch (RS4) and high amylose-lauric acid complex (RS5) on water-fat binding capacities, texture, color and microstructure of low-fat meat emulsions were investigated. Four types of RS improved water retention, emulsion stability, textural properties and brightness of low-fat meat emulsions, displaying even better potential than inulin (positive control). Compared with inulin, RS2 ∼ RS5 induced the transition from free water to immobilized water, increased storage modulus G' (by 21.90 %, 38.13 %, 55.73 % and 45.92 %, respectively), hydrophobic interactions (by 36.03 %, 60.84 %, 44.40 % and 48.04 %, respectively), disulfide bonds and β-sheet, which promoted the formation of tight protein gel networks. Notably, physical or chemical modified RS (RS3, RS4, RS5) displayed preferable and more similar water-fat binding properties, making them more promising for personalized application in low-fat functional meat products.