火龙果(Hylocereus undulatus)果皮可以作为一种优良的膳食纤维来源, 且其膳食纤维具有良好的理化性能。为提高火龙果果皮的综合利用水平, 该研究以火龙果果皮为原料, 首先采用纤维素酶水解法对火龙果果皮中的可溶性膳食纤维进行提取, 然后采用单因素试验和响应面法优化酶提取工艺。结果表明, 纤维素酶法提取火龙果果皮中可溶性膳食纤维的优化工艺条件为: 纤维素酶浓度0.54%, 酶解温度50°C, pH5.2。在此条件下, 可溶性膳食纤维的提取率可达19.81%; 膳食纤维的持水力为31.25 g∙g^-1, 溶胀性为29.11 mL∙g^-1。

Pitaya peel can be a good source for preparing dietary fibers, and such dietary fibers has excellent physicochemical properties. To stimulate the comprehensive utilization of pitaya, we optimized the extraction of soluble dietary fibers (SDF) from pitaya peel. The cellulase digestion method was used with single-factor experiments and the response surface method. The optimized extraction conditions were cellulase concentration of 0.54%, enzymolysis temperature at 50°C and solvent pH of 5.2. Under the optimal conditions, the extraction rate of SDF from pitaya peel was up to 19.81%, the water holding capacity was 31.25 g∙g^-1 and the swelling capacity was 29.11 mL∙g^-1.