为使苹果膳食纤维的色泽达到感官要求,利用超声辅助臭氧脱色技术对其进行脱色处理,通过单因素试验和正交试验,得到最佳脱色工艺条件为:臭氧发生量15 g/h,超声频率70 kHz,碱液浓度6%,料液比(g∶mL)1∶25,脱色时间5 h。试验测定了脱色后膳食纤维的L值,可达到80.11,表明该工艺的脱色效果较好,与双氧水脱色技术相比较,不但解决了溶剂残留问题,而且脱色效果显著。

In order to reach the sensory requirement of the apple dietary fiber,the combination of ultrasonic irradiation and ozone technology was apply on the discoloration process of the apple dietary fiber. Through single-factor test and orthogonal test,the optimal discoloration technology parameters were as follows: 15 g / h of ozone generation, 70 kHz of ultrasonic frequency,6% of sodium hydroxide concentration,1∶ 25 of the ratio of material to liquid( g: mL),and reaction time 5 h. Under these conditions,the L value of the discolored dietary fiber reached 80. 11. Results from this study indicated that the combination of ultrasonic irradiation and ozone was an effective discoloration method. Compared with the decolorizing technology by H 2 O 2,the combination of ultrasonic irradiation and ozone technology had not only solved the problem of solvent residues,but also had a remarkable effect on discoloaration.