Effects of Adding Blueberry Residue Powder and Extrusion Processing on Nutritional Components, Antioxidant Activity and Volatile Organic Compounds of Indica Rice Flour

SIMPLE SUMMARY: The aim of this study was to investigate the effects of adding blueberry residue and extrusion processing on nutritional components, antioxidant activity and volatile organic compounds of indica rice flour. The results showed that, after adding blueberry residue and extruding, the content of fat and total starch decreased significantly, while the content of total dietary fiber and anthocyanins increased significantly, and the effect of scavenging DPPH and ABTS+ free radicals was enhanced, and the antioxidant capacity in vitro was improved. In addition, GC—IMS analysis detected 104 volatile compounds in indica rice expanded powder containing blueberry residue and indica rice expanded powder, and 86 volatile organic compounds were successfully identified. The contents of 16 aldehydes, 17 esters, 10 ketones and 8 alcohols were significantly increased. Therefore, it is an efficient and innovative processing method to add blueberry residue powder to indica rice flour and extrude it, which can significantly improve its nutritional value, antioxidant properties and flavor substances, and has broad application prospects in the production of nutritious food and functional food. ABSTRACT: Using indica rice flour as the main raw material and adding blueberry residue powder, the indica rice expanded powder (REP) containing blueberry residue was prepared by extrusion and comminution. The effects of extrusion processing on the nutritional components, color difference, antioxidant performance and volatile organic compounds (VOCs) of indica rice expanded powder with or without blueberry residue were compared. The results showed that the contents of fat and total starch decreased significantly after extrusion, while the contents of total dietary fiber increased relatively. Especially, the effect of DPPH and ABTS+ free radical scavenging of the indica rice expanded flour was significantly improved by adding blueberry residue powder. A total of 104 volatile compounds were detected in the indica rice expanded powder with blueberry residue (REPBR) by Electronic Nose and GC—IMS analysis. Meanwhile, 86 volatile organic compounds were successfully identified. In addition, the contents of 16 aldehydes, 17 esters, 10 ketones and 8 alcohols increased significantly. Therefore, adding blueberry residue powder to indica rice flour for extrusion is an efficient and innovative processing method, which can significantly improve its nutritional value, antioxidant performance and flavor substances.