压热及酶解脱支处理对莲藕淀粉品质的影响OA北大核心CSTPCD

Starch is the main component of lotus root.Starch modification was carried out through auto-claving treatment and enzymolysis debranching treatment,and the modified starch quality was compared.The results showed that the binding ability of amylase and iodine in modified lotus root starch increased significant-ly,and the iodine binding capacity of the starch modified by enzymolysis debranching treatment with pullula-nase(ELRS)was the highest,which meaned that the soluble amylase content in lotus root starch was the highest.The hydration capacity of the modified lotus root starch was significantly enhanced,and the starch modified by autoclaving treatment(HLRS)showed the highest capacity of water retention,oil retention and swelling(21.766%),and the lowest water extraction rate(14.300%).The solubility(63.555%)and trans-parency(0.717%)of the starch modified by autoclaving first and then enzymolysis debranching treatment(HELRS)were the highest.After modification,the initial gelatinization temperature(T0),enthalpy value(ΔH)and gelatinization point(ΔT)of the lotus root starch decreased,and the ΔH of HELRS was the lowest,indicating that the energy required to dissolve lotus root starch decreased after modification.The test results on gel properties of modified starch showed that the hardness,elasticity,cohesiveness,viscosity and resilience of the modified lotus root starch decreased.The conclusion of this study provided a theoretical basis for starch modification according to different requirement in food production,and provided guidance for the development of high value-added products of lotus root starch.