采用南瓜为原料,对微波辅助提取南瓜SDF(水溶性膳食纤维)的工艺及南瓜SDF功能特性进行了研究。通过L9(3^4)正交试验优化了提取液倍数、pH、微波功率、提取时间主要影响因素。确定了微波法提取南瓜SDF较佳工艺为pH2、提取液倍数125、提取时间为8min、提取功率为600W,此时南瓜SDF提取率为68.312mg/g;通过对提取的南瓜SDF功能特性进行研究发现,南瓜SDF平均持油力为0.6733,平均持水力为2.3213,其水溶液黏度受浓度和温度影响很大,随着浓度上升而大幅提高,随着温度升高却大幅下降,在pH7时呈现最低值,随着氯化钠浓度的提高呈现降低趋势,而随着蔗糖浓度的升高呈现黏度增加的趋势。
This topic used pumpkin as the raw material, microwave assisted extraction of soluble dietary fiber (SDF) pumpkin process and its physicochemical properties were studied. Discusses the solid- liquid ratio, pH, microwave power and extraction time on the yield of SDF. On the basis of single factor experiment, through L9(34) orthogonal test to determine the best extraction process. The best technology of pumpkin SDF extracted for pH2.0, the dilution liquid in multiples of 125, the radiation power of 600 W, extracting time 8 min. Under these conditions, the SDF extraction rate was 68.312 mg/g. Meanwhile the extract soluble dietary fiber of pumpkin was as raw materials, to explore the different factors (concentration, pH, temperature, sodium chloride content, sucrose content) aqueous solution viscosity of pumpkin dietary fiber.