abstract
- Decoction residues (DR) of Roselle are a waste with high polyphenol content. The remaining polyphenols are resistant to thermal treatments and have antioxidant properties. An alternative for the use of the DR is the extrusion with wall material that can preserve the antioxidant capacity of the polyphenols. The present study aimed to produce a functional ingredient with the Roselle DR by extrusion with different commercial starchy wall materials (Capsul, N-Lok, and Globe). The extrudates were analyzed for morphology, bioaccessibility of polyphenols, antioxidant capacity (AC), and starch digestion rate. The confocal microscopy showed the presence of fiber with polyphenols. The extruded with Capsul and Globe showed the highest slowly digestible starch (SDS) and resistant starch (RS) content. The bioaccessibility of polyphenols was higher in the Capsul and Globe extrudates indicating gradual release during the intestinal digestion. Capsul and Globe showed the best results in protecting the polyphenols. © 2024 Elsevier Ltd