己酮糖是分子中有酮基的己糖，主要有阿洛酮糖、果糖、山梨糖、塔格糖等。

果聚糖： 菊粉 · 果聚糖β2→6

甘露聚糖

半乳聚糖

A ketohexose is a ketone-containing hexose (a six-carbon monosaccharide). The most common ketohexoses, each of which represents a pair of enantiomers (D- and L-isomers), include psicose, fructose, sorbose, and tagatose. Ketohexose is stable over a wide pH range, and with a primary pK_a of 10.28, will only deprotonate at high pH, so is marginally less stable than aldohexose in solution.