响应面优化火龙果皮中水不溶性膳食纤维提取工艺

以火龙果皮为原料,采用酸碱结合法提取水不溶性膳食纤维(IDF),通过单因素实验和响应面分析,探讨Na OH质量分数、碱提时间、碱提温度、碱提液料比、酸提温度、酸提时间、酸提液料比七个因素对火龙果皮中水不溶性膳食纤维得率和纯度的影响,并对提取工艺条件进行优化。结果表明,酸碱结合法提取火龙果IDF的最佳工艺条件为Na OH质量分数4.3%、碱提温度46.5℃、碱提时间60 min、碱提液料比15∶1(m L/g)、酸提温度77.4℃、酸提时间1.5 h、酸提液料比15∶1(m L/g),在此工艺条件下,IDF得率30.29%,纯度达到94.78%,表明该工艺可行。 

Optimization of extraction technology for insoluble dietary fiber from peel of Pitaya by response surface methodology

The sequential treatment with alkaline followed by acid was applied to extract insoluble dietary fiber( IDF)from the peel of pitaya and main process conditions were optimized by single- factor experiments combined with response surface methodology. The extraction rate and purity of IDF were investigated with respect to Na OH concentration,alkaline extraction time,alkaline extraction temperature,alkaline extraction liquid- to- material ratio,acid extraction temperature,acid extraction time and acid extraction liquid- to- material ratio. The results showed that the optimal extraction conditions were Na OH concentration of 4.3%( g / g),alkaline extraction temperature46.5 ℃,alkaline extraction time 60 min,alkaline extraction material- to- liquid ratio 15 ∶ 1( m L / g),acid extraction temperature 77.4 ℃,acid extraction time 1.5 h and acid extraction material- to- liquid ratio 15∶1( m L / g).Under the optimal extraction conditions,the yield and purity of IDF were 30.29% and 94.78%,respectively.