Hoover and coworkers (1981; Hoover & Manuel, 1996a) claimed that amylose content and starch chain length were two significant factors determining the physical properties of the heat±moisture treated products. Not only the complex formation between amylose and lipids, but also the interactions between amylose chains and other starch chains (mainly in amorphous regions), may cause physical changes in the treated starch. The structural difference between corn and potato amylose chains and the presence of lipids in corn starch could result into the different in fluences by HMT upon the thermal characteristics of the two starches.