Vol. 11, Issue 11 (2022)

Sweet orange (Citrus sinensis) belongs to the family Rutaceae. A 50-60% useful by-product is created during the sweet orange juice extraction process, which is a waste. When the peel is the primary by-product of sweet orange juice extraction. Currently, the peel is extensively utilized in animal feeds and biogas production. It might be a fascinating source of health advantages and medicinal material. Efforts were made to investigate the effect of drying temperature (50 °C, 70 °C, and 90 °C). Drying time (90 min., 120 min. and 150 min.) and grinding temperature (-15 °C, 5 °C and 25 °C) on changes in color properties (Colour L*, Colour a*, color b*, hue angle, chroma and ∆E) of sweet orange peel. The results revealed that parameters dropped as drying time and temperature increased, however, color analyses revealed the contrary. The grinding temperature was a crucial factor in the study, with lower grinding temperatures exhibiting the higher color parameters. Among all treatment combinations, the optimal treatment is 71 °C drying temperature, 150min drying time, and -15 °C grinding condition, which exhibited greater color properties.