Abstract
Orange peels (OP) as a fruit waste is a rich source of polyphenolic compounds (PC). In this research, the different concentrations of orange peel were extracted to obtain the highest PC concentration. The aqueous orange peel extracts (OPE) were encapsulated using coacervation method. Different ratios between wall materials (whey protein concentrate (WPC) and gum arabic ((GA) 3:1, 3:2 and 3:3) were investigated. The ratios between OPE and wall materials were 1:10 and 1:20. Encapsulated OPE was supplemented in yoghurt. The encapsulation efficiency (EE) was evaluated for capsules while phenolics content (PC), physiochemical and texture properties of yoghurt samples were evaluated during cold storage (fresh, 7 and 15 days). The higher EE (95.4%) was observed when used WPC: GA at ratio 3:1 and OPE: wall materials at ratio 1:10. There aren't any significant influences on the physiochemical and texture properties of yoghurt samples. The organoleptic properties of supplemented yoghurt had gained acceptable flavor and satisfied scores from judging persons. Application of microcapsules as a carrier of orange peel extract in yoghurt (WPC: GA at ratio 3:1 and OPE: wall material at ratio 1:10) had the best potential to be successfully applied.
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