对苹果渣膳食纤维脱色工艺进行了研究,将微波加热技术应用于H2O2脱色工艺中,采用响应面法得出优化条件为:pH值12.5、微波作用时间48 s和H2O2浓度为9.17%,在料液比(g∶mL)1∶14、微波功率480 W条件下,用色差计测得脱色后的白度为57.34%,脱色前原料白度为27.54%,脱色效果显著。所得回归模型拟合情况良好,达到设计要求。扫描电镜和X射线衍射分析表明微波对苹果渣纤维表面的微结构有破坏作用。

The conditions for decolorization of apple dietary fiber were established for laboratory study.The microwave method was applied to the optimal conditions for decolorization of apple dietary fiber.In this study,the optimal conditions determined by response surface methodology(RSM) were: pH 12.5、microwave time 47.75s and H2O2 concentration 9.17%,material-solution ratio 1∶ 14 and microwave power 480W.Under the above conditions,the Whiteness was 57.34%(mean value) in the final product,while 27.54% before the decolorization.The effect was significant.The empirical model developed by response surface methodology(RSM) is adequate to describe the relationships between the factors and response value.The results of the curve by scanning electron and X-ray diffraction analysis showed that microstructure of the apple dietary fiber surface was changed by microwave.