Hydrogel Film-Forming Solutions with Jojoba Oil

Hydrogel film-forming solutions with a concentration of 8% were obtained by mixing whey protein isolate with water using a Zelmer type 371.5 mixer. The mixtures were heated at 80 °C for 30 min using an RCT basic IKAMAG magnetic stirrer (IKA-Werke GmbH & Co., Staufen, Germany) rotating at 250 rpm. Glycerol was added in an amount of 50% relative to the added protein. The solution without adding other substances was defined as the control solution. Jojoba oil was added to the remaining parts of the solution at concentrations of 0%, 0.5%, 1.0%, 1.5%, and 2.0%. The solutions with the addition of oil were homogenized using IKA Yellowline DI25 basic (IKA-Werke GmbH & Co., Staufen, Germany) for 5 min at a speed of 24,500 rpm.