Physicochemical Properties and Antioxidant Activity of Quinoa Soluble Dietary Fiber by Different Drying Methods
Soluble dietary fiber(SDF)was prepared from quinoa bran by enzymatic method,and then dried by freeze drying,vacuum drying,hot air drying and spray drying.The effects of drying methods on the structure,physi-cochemical properties and in vitro antioxidant activity of SDF were investigated.The results indicated that the water holding capacity and oil holding capacity of spray-dried SDF were(3.95±0.14)g/g and(5.82±0.12)g/g,re-spectively,the highest among the four drying methods,followed by freeze-drying.The drying method had different types of SDF functional groups,but it would lead to changes in the strength of the absorption peak;the freeze-dried SDF particles were uniform,the aggregates were the smallest,and there were a large number of pores.The bound water in SDF treated by freeze-drying was weak,and the binding strength of immobilized water was high,and the content was low.The DPPH free radical scavenging ability,ABTS+free radical scavenging ability and hydroxyl radi-cal scavenging ability of SDF treated by freeze-drying were the strongest,and the antioxidant activity was the high-est.The IC50 were 1.88,1.38 and 8.18 mg/mL,respectively.In summary,freeze-dried SDF improved its antioxi-dant capacity,water and oil holding capacity,and improved its biological activity.
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