What does maltose mean?
Maltose is a sugar made from two glucose molecules linked together. Enzymes create it when they break down starch, a process especially important in germinating grains, brewing, and digestion. Because maltose is less sweet than table sugar, it is valued in brewing partly for the flavour and fermentation characteristics it contributes rather than sweetness alone. It also occurs naturally in ripening fruit and is used as a food ingredient in syrups and formulations intended for people with limited tolerance of other carbohydrates. In laboratory and clinical settings, the word usually refers specifically to the naturally occurring disaccharide whose glucose units are connected by an alpha-1,4 bond. Maltose can be broken down into glucose by the enzyme maltase. The term should not be confused with maltodextrin, which consists of longer, variable-length chains of glucose units. Maltose is consequently a useful word for understanding how starch, digestion, fermentation, and food processing are chemically connected.
nounMaltose is a disaccharide sugar composed of two glucose molecules joined by an alpha-1,4 glycosidic bond. It occurs naturally in malted grains and ripening fruits and is produced when enzymes break down starch.
- The disaccharide sugar formed by the enzymatic breakdown of starch and consisting of two linked glucose molecules.
"The brewery measured the maltose content of the wort before beginning fermentation."
"Maltose gives malted barley its characteristic sweetness."
"The study reported a marked increase in maltose concentration during starch digestion."
Maltose is normally used as an uncountable noun; the plural appears chiefly when referring to distinct forms or samples of the compound.
"The researchers compared the two maltoses using spectroscopy."
Maltose can be split back into two glucose molecules—making it a tiny molecular recipe for sweetness.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of maltose
The English word was borrowed from French maltose in the nineteenth century. Its name combines malt with the chemical suffix -ose, a form of the Greek word for sugar. The older English word malt, meaning the grain used for brewing and fermentation, comes from Old English and ultimately from a Germanic root shared by words such as malting, maltster, and malthouse.
How maltose is actually used
Maltose is primarily a technical term in biochemistry, brewing, nutrition, and food science. Outside those contexts, it is uncommon, although it may appear on ingredient labels.
Easily confused with maltose
Maltose is a specific disaccharide made of two linked glucose molecules, whereas maltodextrin is a variable-length polymer made from chains of glucose units.