Study on the Characteristics of Water Absorbance, Infrared Spectroscopic Analysis and Extraction Technology of Mucilage from Salvia przewalskii Seeds

Taking Salvia przewalskii seeds as the raw materials, the conditions for extraction, water absorbance characteristics, and infrared spectroscopy of mucilage were studied. Based on single factor experiments, mucilage conditions from Salvia przewalskii seeds were optimized using response surface methodology. A central composite design was used to investigate the effects of three independent variables, namely, extraction time, liquid-to-solid ratio, and extraction temperature on the yield of mucilage. Results showed that mucilage absorbed water well, and dehydrated slowly. Infrared spectroscopy demonstrated that the seed mucilage was a compound of polysaccharides. Optimum extraction conditions were an extraction time of 3.2 h, liquid-to-solid ratio of 54:1 (mL:g), and extraction temperature of 68℃. The maximum extraction yield of mucilage was 4.93%.