What does amylose mean?
Amylose is a naturally occurring carbohydrate: a long, essentially unbranched chain of glucose molecules joined end to end by what chemists call alpha-1,4 linkages. Together with its branched relative amylopectin, it makes up starch, the chief energy store of plants such as potatoes, rice, wheat, and maize. Typically accounting for about twenty to thirty percent of ordinary starch, amylose gives starch much of its useful behaviour in the kitchen and the laboratory: it forms gels and films, thickens sauces, and causes cooked starch to firm up as it cools. Its proportion varies between plant varieties — high-amylose rice cooks up dry and separate, while low-amylose rice turns sticky and glossy — which makes the word important in food science, plant breeding, and nutrition research. Because it is a technical term, amylose appears mainly in scientific, culinary-professional, and educational contexts rather than everyday conversation.
nounA linear polysaccharide made of glucose units linked by alpha-1,4 bonds; it is the soluble, straight-chain component of starch.
- (Biochemistry) A linear polymer of glucose linked by α(1→4) glycosidic bonds, constituting roughly one-fifth to one-third of most starches and responsible for starch's gelling and film-forming properties.
"The iodine turned the solution deep blue, confirming that amylose was present in the starch sample."
"Rice varieties with high amylose content stay separate and fluffy after cooking rather than turning sticky."
"In the lab, the students hydrolysed the amylose fraction into maltose using dilute acid."
Rarely pluralised; the singular is used even when discussing amylose from different sources, since samples differ in degree of polymerisation rather than kind.
"Amyloses isolated from different cereals varied widely in chain length."
The difference between a runny sauce and a firm gel often comes down to how much amylose your starch contains — it's the strand of starch that snaps back into structure as food cools.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of amylose
The name derives from Latin amylum, meaning fine starch or starch powder, itself borrowed from Greek amylon, referring to finely milled grain. The term was coined in the nineteenth century when chemists were separating starch into distinct fractions and needed names for each component. It shares this root with related terms such as amylase, the starch-digesting enzyme, and the chemical family known as amyl compounds.
How amylose is actually used
A technical term confined chiefly to biochemistry, nutrition, and food science; not used in everyday speech. In food-science writing it almost always appears alongside amylopectin, its branched partner in starch.
Easily confused with amylose
Amylose is the straight, unbranched chain of starch, whereas amylopectin is its highly branched counterpart.
Amylose is a starch molecule itself, while amylase is an enzyme that digests it.