Effect of Alkaline Hydrogen Peroxide Modified Pretreatment on Physicochemical Properties and Functional Characteristics of Insoluble Dietary Fiber from Corncob
In this study,corncob insoluble dietary fiber(IDF)was pretreated with different mass fractions of al-kaline hydrogen peroxide(AHP),and the physicochemical properties functional properties of corncob IDF before and after AHP modification were evaluated and compared.The results evidenced that the water holding capacity(WHC),oil holding capacity(OHC),water swelling capacity(WSC)and glucose adsorption capacity(GAC)of IDF from corncob were significantly increased after modification.Compared with the untreated IDF,WHC,OHC,WSC and GAC were increased from(2.24±0.03)g/g,(1.88±0.01)g/g,(1.97±0.16)mL/g and(102.16±4.98)mg/g to(4.36±0.18)g/g,(3.18±0.04)g/g,(2.94±0.08)mL/g and(217.77±18.95)mg/g,respectively.The ni-trite adsorption capacity(NAC)of the modified corncob IDF was significantly increased at pH 2.0 and reached a maximum value of 68.45 µg/g after 2.0％AHP modification.In addition,scanning electron microscopy(SEM)ob-served apparent surface folds and porous mesh structure after AHP modification.Fourier transform infrared spectros-copy(FT-IR)and X-ray diffraction(XRD)patterns demonstrated that AHP modification was able to degrade hemicellulose and lignin in corncob IDF.Overall,AHP modification could effectively improve the properties of corn-cob IDF.
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