This study investigated the changes of structure and functional properties of insoluble dietary fiber(IDF)from lotus root residue before and after alkaline hydrogen peroxide(AHP)treatment.Results showed that D-glucose content of lotus root residue IDF increased significantly by 9.52％(P＜0.05),while the contents of other monosaccharides decreased significantly(P＜0.05)by AHP treatment.Scanning electron microscopy analysis showed that IDF had fluffy structure and wrinkled surface after AHP treatment.The results of X-ray diffraction indicated the crystal structure of IDF did not change after AHP treatment,but the diffraction intensity increased from 13.09％to 16.13％(P＜0.05).Infrared spec-troscopy indicated the breakage of some chemical bonds of IDF after AHP treatment,and the characteristic adsorption peaks weakened or disappeared.Thermogravimetric analysis showed that after AHP treatment,the peak pyrolysis tempera-ture of IDF decreased,but the mass residue rate increased from 10.43％to 15.94％(P＜0.05).Moreover,the water hold-ing capacity,oil holding capacity,cholesterol adsorption capacity,Cu2+adsorption capacity and cation exchange power of IDF were effectively enhanced(P＜0.05)after AHP treatment,sodium nitrite adsorption capacity of did not change signif-icantly(P＞0.05),while the expansion capacity was greatly reduced(P＜0.05).These results suggested that AHP treatment can change the structure of lotus root residue IDF and improve its functional properties.
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