Thứ tư, 24/04/2024 | 13:18
ABSTRACT PRODUCTION OF ROSELLE POWDER FROM DRY ROSELLE CALYCES Dang Huynh Duc, Vo Pham Phuong Trang, Dao Thanh Khe, Nguyen Van Tung Ho Chi Minh City University of Food Industry The roselle powder was produced by spray drying from condensed liquid extraction of roselle. In this article, the spray drying method was used to produce roselle powder from dried samples of roselle calyces grown in Vietnam. Based on the results of assessing the effect of extract conditions compound from dried roselle calyces, survey of technological parameters affecting the spray drying of the roselle powder. The optimum conditions for roselle extracts were 1/10 ratio (g/mL) of dried calyces to water and the extraction temperature of 50°C for 30 min. The method of evaporation the vacuum of -710 mmHg at the coat temperature of 70°C was an appropriate selection. The product after concentration was mix maltodextrin at the ratio of 15% (by weight), spray dry at the temperature of 160°C with the pumping speed of input at 4 rpm and the pressure of 2.5 bar. The roselle powder product has a moisture content of 3.74 ± 0.03%, the ash content of 1.82 ± 0.07%, the anthocyanin content of 10178.87 ± 37.65 (mg/100g), solubility good, bright red color, and no sedimentation. Keyword: Roselle powder, roselle, anthocyanin, vacuum concentrate, spray drying. |
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