Ketohexose

Ketohexose is a type of monosaccharide that contains six carbon atoms and a ketone functional group. The most common ketohexoses are fructose, psicose, sorbose, and tagatose.

Structure and Isomerism

Ketohexoses have a chemical formula of C6H12O6. They are structural isomers of aldohexoses, which are another type of hexose that contains an aldehyde group instead of a ketone group. The ketone group in a ketohexose is located at the second carbon atom, differentiating it from an aldohexose where the aldehyde group is at the end carbon atom.

Common Ketohexoses

Fructose

Fructose is the most common ketohexose and is found in many fruits and vegetables. It is also a component of sucrose, a common table sugar.

Psicose

Psicose, also known as D-allulose, is a rare sugar that has recently gained attention for its potential health benefits. It is structurally similar to fructose but has different metabolic effects.

Sorbose

Sorbose is used commercially in the production of Vitamin C and also as a food additive.

Tagatose

Tagatose is a low-calorie sweetener that is structurally similar to fructose. It is found in small amounts in some dairy products.

Health Effects

Ketohexoses, like all sugars, provide energy for the body. However, they can also contribute to health problems when consumed in excess. High intake of fructose, for example, has been linked to obesity, type 2 diabetes, and heart disease.

See Also

• Monosaccharide
• Isomer
• Ketone
• Aldohexose

Ketohexose Resources
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