Abstract
The aim of this study was to optimize the preparation of whey protein concentrate (WPC)-pectin nanocomplexes as a carrier for rose essential oil (REO) via response surface methodology (RSM); with initial concentrations of WPC (4–8%) and pectin (0.5–1%) at different pH values (3–9). The highest encapsulation efficiency of REO was 96.97% for 4.0:0.5 ratio of WPC:pectin at pH = 3. The highest viscosity was obtained at 4:1 ratio of WPC:pectin and pH = 3, and the highest stability (96.5%) was related to 4:1 ratio of WPC:pectin at pH = 9; the lowest stability (81%) was observed at 4:1 ratio of WPC:pectin at pH = 3. Finally, the highest solubility occurred at pH = 9 while the lowest solubility was seen in the treatments prepared at pH = 3 due to the creation of a strong WPC-pectin coacervate complex.
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