响应面法优化玫瑰花渣不溶性膳食纤维双氧水脱色工艺

Optimization of Hydrogen Peroxide Decolorization Process of Insoluble Dietary Fiber from Rose Pomace by Reponse Surface Method

通过酶-化学法提取玫瑰花渣中的膳食纤维,利用双氧水对玫瑰花渣中的不溶性膳食纤维(insoluble dietary fiber, IDF)进行脱色。对双氧水浓度、脱色温度、pH值、脱色时间4个因素进行单因素试验,然后进行响应面试验。响应面试验及验证试验结果表明,IDF的最佳脱色条件为双氧水浓度(质量分数)11%、pH值10、脱色时间80 min、脱色温度71℃,在此条件下色差值ΔE为51.37。产品颜色为黄绿色,无任何异味,呈细小颗粒状。脱色后IDF性质得到一定程度的提高,持水力为6.857 4 g/g,持油力为1.837 9 g/g,膨胀力为3.17 mL/g。

The dietary fiber is extracted from rose pomace by enzyme-chemical method,and the insoluble dietary fiber(IDF)in rose pomace is decolorized by using hydrogen peroxide.Single factor test is conducted on the four factors such as hydrogen peroxide concentration,decolorization temperature,pH value and decolorization time,and then response surface test is carried out.The results of response surface test and validation test show that the optimal decolorization conditions for IDF are hydrogen peroxide concentration(mass fraction)of 11%,pH value of 10,decolorization time of 80 min and decolorization temperature of 71℃,under such conditions,the color difference valueΔE is 51.37.The color of the product is yellowish green,without any odor,in the form of fine particles.After decolorization,the properties of IDF are improved to a certain extent,the water holding capacity is 6.8574 g/g,the oil holding capacity is 1.8379 g/g,and the water swelling capacity is 3.17 mL/g.