High-maltose_corn_syrup
High-maltose corn syrup (HMCS) is a food additive used as a sweetener and preservative. The majority sugar is maltose. It is less sweet than high-fructose corn syrup[1] and contains little to no fructose.[1] It is sweet enough to be useful as a sweetener in commercial food production, however.[2] To be given the label "high", the syrup must contain at least 50% maltose.[3] Typically, it contains 40–50% maltose, though some have as high as 70%.[4][5]
By using β-amylase or fungal α-amylase, glucose syrups containing over 50% maltose, or even over 70% maltose (extra-high-maltose syrup) can be produced.[6]p. 465 This is possible because these enzymes remove two glucose units, that is, one maltose molecule at a time from the end of the starch molecule.