Type III. Type III resistant starch (RSIII) is retrograded amylose and starch (21–23). Because amylose molecules have
linear structures, they have a great tendency to form double
helices, particularly near refrigeration temperatures (4–58C)
and with adequate moisture content. Retrograded amylose
has high gelatinization temperatures, up to 1708C, and cannot be dissociated by cooking. The gelatinization temperature
of retrograded amylose, however, decreases with shortening of
the amylose chain length. After starchy foods are stored, particularly in a refrigerator, amylose molecules and long branch
chains of amylopectin form double helices and lose their water-binding capacity. The double helices of starch molecules
do not fit into the enzymatic binding site of amylase, thus
they cannot be hydrolyzed by this enzyme.
Type III. Type III resistant starch (RSIII) is retrograded amylose and starch (21–23). Because amylose molecules havelinear structures, they have a great tendency to form doublehelices, particularly near refrigeration temperatures (4–58C)and with adequate moisture content. Retrograded amylosehas high gelatinization temperatures, up to 1708C, and cannot be dissociated by cooking. The gelatinization temperatureof retrograded amylose, however, decreases with shortening ofthe amylose chain length. After starchy foods are stored, particularly in a refrigerator, amylose molecules and long branchchains of amylopectin form double helices and lose their water-binding capacity. The double helices of starch moleculesdo not fit into the enzymatic binding site of amylase, thusthey cannot be hydrolyzed by this enzyme.
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