Starch Gelatinisation
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Origin
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Description
Starch — the storage carbohydrate in grains, legumes, and root vegetables — transforms when heated in the presence of water through a process called gelatinisation: the starch granules absorb water, swell, and eventually rupture, releasing their amylose and amylopectin chains into the surrounding liquid. This transformation is what thickens sauces, gives bread its structure, produces the texture of perfectly cooked pasta and rice, and allows starch-based gels to form. Every sauce thickened with flour, cornstarch, or arrowroot is exploiting starch gelatinisation.
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The Thread
—Japanese kuzu (arrowroot) in ankake sauces: a starch gel that achieves clarity impossible with wheat starch
—Korean ttok (rice cake) exploits glutinous (waxy) rice starch's unique gelatinisation behaviour
—French velouté sauce's particular texture compared to cornstarch-thickened sauce reflects exactly the amylose-amylopectin difference between wheat flour and cornstarch
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Flavour Context
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Pillars V — VII
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