Abstract:Dialdehyde starch is prepared with yam starch as raw materials and NaIO4 as an oxidant. The effects of reaction conditions, such as temperature, reaction time, pH value, concentration of starch solution and mole ratio of sodium periodate to yam starch on the aldehyde content in the product were investigated. The experimental results showed that dialdehyde starch could be prepared at 40 ℃ for 4 h with other conditions of pH value 4, the concentration of starch solution 20%, the mole ratio of sodium periodate to yam starch 1.1:1 and the aldehyde content of final product reached 97.5%.
