Feature analysis of structure of potato dietary fibre

Potato dietary fibre (PDF) was prepared by steam explosion and oxidation with the waste residue of potatoes, the structure and morphology of potato dietary fibre were investigated by IR, SEM, TGA and chemical methods. After a series of physical and chemical treatments, the long chains of galactan in potato residue changed into short chains and the original block forms became ruleless net-bedded structure, the aldehyde of galactose was changed into carboxyl. PDF has characteristics of larger ratio specific surface area and thermodynamics stabilization. The adsorption of PDF for Cholesterol was investigated, the adsorptive capacity is 1.4 mg/g, the adsorption mode corresponds with Freundlich model. The results indicate that PDF maybe have adsorption to morbigenous substances in vivo.