采用碱法提取茶末水溶性膳食纤维(soluble dietary fibre,SDF),研究提取SDF的工艺以及茶末SDF的品质特性。结果表明,碱法提取SDF的适宜工艺为:NaOH的质量分数为8%,提取温度为90℃,提取时间为75min。影响SDF提取的因素依次是温度,碱浓度与时间。SDF在pH值2.0时NO2-的吸附量达到19.70μmol/g,显著高于pH值7.0的吸附量(15.83μmol/g)。SDF在pH值7.0时对胆固醇的吸附量为82.09 g/g,高于pH值2.0下的吸附量71.28 g/g。

The analysis of quality and extraction of soluble dietary fiber(SDF) from tea dust by alkali treatment were investigated.The results showed that the optimum conditions of extraction were obtained on the basis of single factor and orthogonal test: NaOH concentration 8%,temperature 90℃,time 75 min.The effect of temperature was the most significant,followed by NaOH concentration and time.The amounts of NO2-absorbed by SDF at pH 2.0 were 19.70 μmol/g,significantly higher than that at pH 7.0(15.83 μmol/g),while the amounts of cholesterol absorbed at pH 2.0 was 71.28 g/g and 82.09 g/g at pH 7.0.The data indicated that the characteristic of SDF extracted from tea dust is perfect,and it will have the potential using in the healthy food products.