苦杏仁皮水不溶性膳食纤维提取工艺优化及其特性分析

以苦杏仁皮为原料，选取NaOH溶液浓度、超声时间和超声温度为试验因素，采用响应面法优化苦杏仁皮中水不溶性膳食纤维的提取工艺，并对影响其持水性和溶胀性的因素进行研究。结果表明，苦杏仁皮中水不溶性膳食纤维提取的最佳工艺条件为NaOH溶液浓度0.70 mol/L、超声时间51 min、超声温度86 ℃，此时水不溶性膳食纤维提取率为49.73%。在研究范围内，其持水性和溶胀性受葡萄糖质量分数的影响较小，受酸碱度和超声温度的影响较为显著。

Optimization of Insoluble Dietary Fiber Extraction from Apricot Kernel Skin and Its Physicochemical Characteristics

The extraction conditions of insoluble dietary fiber (IDF) from apricot kernel skins were optimized using
response surface methodology by modeling extraction yield with respect to three variables including alkali concentration,
ultrasonication time and extraction temperature. Furthermore, factors affecting the water-holding capacity and swelling
capacity of IDF were also studied. The results showed that the optimal extraction conditions were as follows: sodium
hydroxide concentration, 0.70 mol/L; ultrasound-assisted extraction time, 51 min; and extraction temperature, 86 ℃. The
extraction yield of IDF was 49.73% under these conditions. In addition, this study found that the water-holding capacity and
swelling capacity of the IDF were affected less by glucose concentration, but significantly by pH and temperature within the
investigated ranges.