Pomegranate peel pectin was extracted with nitric acid solution
(HNO3) (solid–liquid ratio; 1:50; g/mL). The mixture was stirred at
400 rpm (Stirrer Heidolph RZR 20051 electronic, Germany) using
optimal extraction conditions obtained in a previous work
(80 min, 86 C and 20 mmol/L nitric acid).