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Heptose
 
 
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A heptose is a monosaccharide
Monosaccharide

Monosaccharides are the most basic unit of carbohydrates. They are the simplest form of sugar and are usually colorless, water-soluble, crystal solids....
 with seven carbon
Carbon

Carbon is a chemical element with chemical symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalence?making four electrons available to form covalent bond chemical bonds....
 atoms.

They either have an aldehyde
Aldehyde

An aldehyde is an organic compound containing a terminal carbonyl group. This functional group, which consists of a carbon atom bonded to a hydrogen atom and double bond to an oxygen atom , is called the aldehyde group....
 functional group
Functional group

In organic chemistry, functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules....
 in position 1 (aldoheptoses), or a ketone
Ketone

In organic chemistry, a ketone is a type of organic compound which contains a carbonyl group bonded to two other carbon atoms in the form:Neither of the substituents R1 and R2 may be equal to hydrogen ....
 functional group in position 2 (ketoheptoses).

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






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Encyclopedia


A heptose is a monosaccharide
Monosaccharide

Monosaccharides are the most basic unit of carbohydrates. They are the simplest form of sugar and are usually colorless, water-soluble, crystal solids....
 with seven carbon
Carbon

Carbon is a chemical element with chemical symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalence?making four electrons available to form covalent bond chemical bonds....
 atoms.

They either have an aldehyde
Aldehyde

An aldehyde is an organic compound containing a terminal carbonyl group. This functional group, which consists of a carbon atom bonded to a hydrogen atom and double bond to an oxygen atom , is called the aldehyde group....
 functional group
Functional group

In organic chemistry, functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules....
 in position 1 (aldoheptoses), or a ketone
Ketone

In organic chemistry, a ketone is a type of organic compound which contains a carbonyl group bonded to two other carbon atoms in the form:Neither of the substituents R1 and R2 may be equal to hydrogen ....
 functional group in position 2 (ketoheptoses).

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

    Sedoheptulose or D-altro-heptulose is a ketoheptose — a monosaccharide with seven carbon atoms and a ketone functional group. It is one of the few heptoses found in nature....
     or D-altro-heptulose (a ketose) and
  • L-glycero-D-manno-heptose (an aldose).


Notice that ketoheptoses have 4 chiral centers whereas aldoheptoses have 5.

See also


  • Triose
    Triose

    A triose is a monosaccharide containing three carbon atoms. There are only two trioses, an aldotriose and a ketotriose . Trioses are important in Cellular respiration....
  • Tetrose
    Tetrose

    A tetrose is a monosaccharide with 4 carbon atoms. They either have an aldehyde functional group in position 1 or a ketone functional group in position 2 ....
  • Pentose
    Pentose

    A pentose is a monosaccharide with five carbon atoms.They either have an aldehyde functional group in position 1 , or a ketone functional group in position 2 ....
  • Hexose
    Hexose

    In organic chemistry, a hexose is a monosaccharide with six carbon atoms, having the chemical formula C6H12O6. Hexoses are classified by functional group, with aldohexoses having an aldehyde at position 1, and ketohexoses having a ketone at position 2....