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Stachyose is a tetrasaccharide consisting of two α--galactose units, one α--glucose unit, and one β--fructose unit sequentially linked as Gal(α1→6)Gal(α1→6)Glc(α1↔2β)Fruf.. Together with related such as raffinose, stachyose occurs naturally in numerous (e.g. , and other beans) and other plants.
Stachyose is less sweet than sucrose, at about 28% on a weight basis. It is mainly used as a bulk sweetener or for its functional oligosaccharide properties. Stachyose is not completely digestible by humans and delivers 1.5 to 2.4 calorie/g (6 to 10 kilojoule/g).
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