Starch modification with microbial alpha-glucanotransferase enzymes

► Enzymes can replace chemical modification to synthesize resistant starches. ► α-Glucanotransferases modify starch structures without decreasing molecular weight. ► Starches are converted in thermoreversible starch gels by 4-α-glucanotransferases. ► α-Glucanotransferases are increasingly used to make value-added starch derivatives.