超声辅助双氧水脱色苹果膳食纤维的研究

Study on the decoloration of apple dietary fiber by the combination of ultrasonic irradiation and H_2O_2

利用超声辅助双氧水脱色技术对苹果膳食纤维进行了脱色处理,通过分光测色计测定了脱色后膳食纤维的白度,结果用L值表示.研究了双氧水浓度、碱液浓度、料液比、脱色时间和超声频率对脱色效果的影响.通过单因素和正交试验,得到最佳脱色条件为:双氧水浓度1.3%,碱液浓度1.3%,料液比1∶15,脱色时间45min,超声频率60KHz.测得脱色后膳食纤维的L值达80.79,其持水力、膨胀力、持油力分别为13.29g/g、15.10mL/g、2.89g/g,与未经脱色的苹果渣膳食纤维相比,有了显著地提高.

The combination of ultrasonic irradiation and H2O2 was applied in the decoloriza-tion of apple dietary fiber ,color of dietary fiber was determined according using a color ana-lyzer ,the value of L was measured .The influences of the concentration of H2O2 ,the con-centration of sodium hydroxide ,the radio between material and the solution ,the reaction time and the ultrasonic frequency was investigated .Through single-factor test and orthogonal test ,the optimal decolorization conditions were ：1 .3% of H2O2 concentration ,1 .3% of the sodium hydroxide concentration ,1∶15 of the radio of material and solution ,45 min of reac-reaction time and 60 KHz of ultrasonic frequency .Under these conditions ,L value of the discolored dietary fiber reached 80 .79 ,and the water holding capacity ,the expansion force and oil holding force were 13 .29 g/g 、15 .10 mL/g and 2 .89 g/g .Compared with the material ,the effect of discoloration was in evidence .