Volume 19, Issue 122 (April 2022)
Abstract
Nowadays, the necessity of using stable and high quality Pickering emulsions in the preparation of low-calorie foods has been considered by food industry researchers. In this research, the effects of oil type (sesame and corn) and its amount (20-70%) on some properties of Pickering emulsion containing amaranth protein isolates (droplet size, creaming index, protein absorption, surface tension and color indexes) were investigated. The results showed that the diameter of emulsion droplets was in the range of 0.87 to 1.5 μm. Although the increase in the oil concentration caused a very significant increase (P <0.0001) in the diameter of the emulsion droplets, protein absorption, and b* index, a notable decrease (P <0.0001) was detected in the color indexes of L* and a*. In other characteristics of prepared emulsions, the rise in oil content from 20% to 50%, effectively increased the creaming index (P<0.005) and surface tension (P<0.0001), while in samples containing 70% oil, the mentioned properties decreased. Finally, it is concluded that the samples containing 70% corn oil or 20% sesame oil had the best emulsion properties.
Volume 20, Issue 139 (September 2023)
Abstract
In this research, the effect of inlet air temperature (130 and 160°C), type and composition of carriers (maltodextrin, Arabic gum and whey protein concentrate (WPC)) on yield, moisture, bulk density and impact, solubility, wettability, flowability (angle of repose) and hygroscopicity of spray dried borage flower extract were investigated. In all tests, atomizer speed, feed flow rate, feed temperature, and atomizer air pressure were kept constant at 18000 rpm, 10 ml/min, 30 ± 1 °C, and 4 ± 0.1 bar, respectively. The minimum significant difference was calculated at less than (P<0.05) using SPSS software. The results showed that the highest production efficiency (48%) was achieved in dried samples with the combination of maltodextrin and WPC. While the use of protein as a carrier led to a decrease in the amount of moisture, mass and impact density, solubility, wettability and hygroscopicity of particles. The optimization results using the estimated models indicated that the highest solubility and the lowest hygroscopicity are created in the powder dried at 130 degrees Celsius with maltodextrin and arabic gum carriers.
