Abstract: Potato porous starch (PS) is used as a material to prepare carboxymethyl porous starch (CMPS) with better solubility and adsorption, then CMPS will be used as a carrier of biologically active substances. The experiment used N2-adsorption/desorption, scanning electron microscopy (SEM), liquid nuclear magnetic (1H NMR), adsorption performance analysis and other methods to study the characteristics of the prepared samples CMPS. The results showed that carboxymethyl porous starch (CMPS) with a degree of substitution (DS) of 0.25-1.44 was successfully prepared. The specific surface area of PS (42.88 m2/g) was the largest. After carboxymethylation, the specific surface area (12.06 m2/g) of CMPS decreased. However, compared with the specific surface area (0.87 m2/g) of carboxymethyl starch (CMS), it was still significantly increased. Both porous and carboxymethyl treatments made the starch crystal disappear, and the etherification reaction reduced the thermal stability of the starch. The loading rate of CMPS@Q was 13.71%, which was 95.84% higher than the loading rate of CMS@Q (0.57%). Compared with quercetin insoluble in water, the water solubility of CMPS@Q (34.00%) was 45.74% higher than that of CMS@Q (23.33%). The prepared CMPS has a good porous structure, specific surface area, solubility and adsorption performance, and can be used as a carrier of low water-soluble functional substances.
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