Abstract:

The optimal technology of extracting soluble dietary fiber (SDF) from stems of Lonicera japonica by cellulose method was investigated and the properties of SDF were also analyzed. Based on singlefactor experiments, orthogonal experiments were performed to optimize the extractive conditions, and the results showed the optimum conditions were pH 4.8, at 45 ℃, 1∶12（g/mL）of material and water, cellulase 1.2% by volume, extracting for 6 h, 3 times.Under the above conditions, the yield of SDF was 3.57%, whose water holding capacity was 6.1 g/g, expansion force was 5.3 mL/g, oil holding capacity was 4.53 g/g, cation exchange capacity was 0.58 mmol/g, highest free radical scavenging rate on DPPH was 80.13%, and the SDF had excellent physical and chemical properties. The study indicated that the cellulose method can be used to extracting SDF from stems of Lonicera japonica.

Key words: stems of Lonicera japonica, cellulase, water soluble dietary fiber, properties