藕渣不溶性膳食纤维提取工艺及其理化性质分析
Extraction Process of Insoluble Dietary Fiber from Lotus Root Residue and Its Physicochemical Properties Analysis
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摘要: 利用莲藕加工的副产物藕渣为原料,在单因素实验的基础上采用响应面分析法优化藕渣不溶性膳食纤维(IDF)的提取工艺,并对其最优提取条件下得到的藕渣IDF的理化性质进行分析。结果表明,藕渣IDF最佳提取工艺条件:NaOH浓度0.60 mol/L、碱解时间90 min、热稳定α-淀粉酶酶解时间60 min、碱性蛋白酶添加量2%,此工艺条件下藕渣IDF得率29.90%±0.06%,藕渣IDF的纯度为91.93%±1.16%,持水性(6.58±0.25) g/g,持油性(4.73±0.33) g/g,膨胀性(3.03±0.12) mL/g;同时,藕渣IDF的亮度值(L*)为38.266±0.187,红度值(a*)为3.412±0.027,黄度值(b*)值为5.268±0.042。研究表明该法所制得的藕渣IDF得率、纯度较高,理化性质较好。Abstract: The lotus pomace was used as raw material to extract insoluble dietary fiber (IDF), and the extraction process was optimized by single factor test and response surface methodology, and the physicochemical properties of the product under its optimal extraction conditions were analyzed.The results showed that, the optimum conditions of extraction of lotus residue IDF as follows:NaOH concentration of 0.60 mol/L, alkaline hydrolysis time of 90 min, amylase hydrolysis time of 60 min and the alkaline protease addition of 2% (g/g).The extraction rate and purity of lotus residue IDF were 29.90% ±0.06% and 91.93% ±1.16%.The water holding capacity of IDF was (6.58 ±0.25) g/g, the oil holding capacity was (4.73 ±0.33) g/g, and the swelling property was (3.03 ±0.12) mL/g.Meanwhile, the values of L*, a* and b* were spearately 38.266 ±0.187, 3.412 ±0.027 and 5.268 ±0.042.It showed that the root residue IDF obtained by this method had high yield, high purity and good physicochemical properties.
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