Study on adsorption conditions of corn protein and starch

Abstract

This paper mainly measured the adsorption of corn protein on corn starch, studied the changes of protein adsorption under different conditions, and discussed the adsorption mechanism of corn starch and protein. The results showed that when the adsorption time was 1h, the amount of adsorbed protein was the largest. Heating will increase the adsorption capacity; In the range of pH3-9, with the increase of pH value, the adsorption amount of protein firstly increases and then decreases, and the adsorption amount is the largest when pH value is about 6. Adsorption decreases with the increase of ionic strength. The addition of acid pulp can reduce the occurrence of protein adsorption, and the amount of protein adsorption is the least when the acid pulp is added to 50%. Increasing the number of pores and pore size on the surface of starch particles can increase protein adsorption. The adsorption isotherm of corn protein used in this experiment on corn starch granules is S-type, belonging to type II adsorption isotherm.