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 p
Ka of 10.28, will only deprotonate at high pH, so is marginally less stable than
aldohexose in solution.