Effect of twin-screw extrusion technique on the content of SDF in ginseng residue
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摘要: 以人参加工厂废弃的人参渣为原料,采用双螺杆挤出技术对其进行低聚化处理,提高人参渣中可溶性成分的含量。采用单因素实验考察了水分添加量、挤出温度和物料粒度对可溶性膳食纤维(Soluble Dietary Fiber,SDF)含量的影响,并在单因素实验的基础上,通过响应面实验对工艺进行优化。采用凝胶色谱法测定挤出前后人参渣中SDF组分的分子量分布。结果表明,双螺杆挤出的最佳工艺参数为:水分添加量142%,挤出温度162℃,物料粒度目数80目,在最佳条件下SDF得率为24.94%。挤出后人参渣中SDF多糖的分子量分布在12915和5201,均达到了高品质膳食纤维的功能活性要求。
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关键词:
- 人参渣 /
- 双螺杆挤出 /
- 可溶性膳食纤维(SDF) /
- 凝胶过滤色谱
Abstract: Ginseng residue discarded by ginseng processing factory was used as raw material and exposed to depolymerization treatment by twin- screw extrusion technique. The effects of water feed rate, extrusion temperature, and particle size of material on the content of soluble dietary fiber (SDF) were investigated by single factor experiments and the process was optimized by response surface test based on single factor experiments. The molecular weight distributions of SDF fraction in unextruded and extruded ginseng residue were determined by gel filtration chromatography. The results showed that the optimum technological parameters of twin-screw extrusion were achieved with 142% of water feed rate, 162℃ of extrusion temperature, 80-mesh of particle size of material, under which the yield of SDF was 24.94%. Molecular weight distributions of SDF fraction in extruded ginseng residue was found to be at 12915 and 5201, which reached the requirement of functional activity of high-quality dietary fiber. -
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