Heptose

A heptose is a monosaccharide with seven carbon atoms.

They have either an aldehyde functional group in position 1 (aldoheptoses) or a ketone functional group in position 2 (ketoheptoses).

Examples

There are few examples of C-7 sugars in nature, among which are:

Sedoheptulose or D-altro-heptulose (a ketose), an early intermediate in lipid A biosynthesis
Mannoheptulose, found in avocados
L-glycero-D-manno-heptose (an aldose), a late intermediate in lipid A biosynthesis.

Ketoheptoses have 4 chiral centers, whereas aldoheptoses have 5.

References

Types of carbohydrates

General

Geometry

Monosaccharides

Dioses	Aldodiose Glycolaldehyde

Trioses	Aldotriose Glyceraldehyde Ketotriose Dihydroxyacetone

Tetroses	Aldotetroses Erythrose Threose Ketotetrose Erythrulose

Pentoses	Aldopentoses Arabinose Lyxose Ribose Xylose Ketopentoses Ribulose Xylulose Deoxy sugars Deoxyribose

Hexoses	Aldohexoses Allose Altrose Galactose Glucose Gulose Idose Mannose Talose Ketohexoses Fructose Psicose Sorbose Tagatose Deoxy sugars Fucose Fuculose Rhamnose

Heptoses	Ketoheptoses Mannoheptulose Sedoheptulose

Above 7	Octoses Nonoses Neuraminic acid

Multiple

Disaccharides	Cellobiose Isomaltose Lactose Lactulose Maltose Sucrose Trehalose Turanose

Trisaccharides	Maltotriose Melezitose Raffinose

Tetrasaccharides	Stachyose

Other oligosaccharides	Acarbose Fructooligosaccharide (FOS) Galactooligosaccharide (GOS) Isomaltooligosaccharide (IMO) Maltodextrin Mannan-oligosaccharides (MOS)

Polysaccharides	Beta-glucan Oat beta-glucan Lentinan Sizofiran Zymosan Cellulose Chitin Chitosan Dextrin / Dextran Fructose / Fructan Inulin Galactose / Galactan Glucose / Glucan Glycogen Hemicellulose Levan beta 2→6 Lignin Mannan Pectin Starch Amylopectin Amylose Xanthan gum

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