Abstract:

Allium chinense leaves were used as the raw materials to conduct acid hydrolysis for extracting water-soluble dietary fiber. The optimal extraction processing parameters were explored by single-factor and orthogonal experiments through evaluating the effects of material-liquid ratio, extraction pH, extraction temperature and extraction time on extraction rate of watersoluble dietary fiber. Results indicated that the optimal extraction processing parameters for water-soluble dietary fiber were material-liquid ratio of 1:15 (g/mL), pH 3.0, extraction temperature of 90 ℃and extraction time of 90 min. The extraction rate of water-soluble dietary fiber from Allium chinense leaves was up to 9.85%. The water-holding capacity and swelling power of the water-soluble dietary fiber were 5.5 g/g and 4.8 mL/g, respectively.

Key words: Allium chinense leaves, water-soluble dietary fiber, extraction