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Hexose sugar structures and properties, all shown in α-D-pyranose conformation

Allose

allose structure

α-D-Allose

Percentage in conformation
α-pyranose β-pyranose α-furanose β-furanose
18 70 5 7

Altrose

altrose structure

α-D-Altrose

Percentage in conformation
α-pyranose β-pyranose α-furanose β-furanose
27 40 20 13

Glucose

glucose structure

α-D-Glucose

Percentage in conformation
α-pyranose β-pyranose α-furanose β-furanose
36 64 0 0

Most common sugar type in nature. Cellulose (β-1,4-glucopyranose) and starch (α-1,4-glucopyranose) are the most common polysaccharides in nature. Glucose is also found in xanthan gum, konjac mannan,


Mannose

Mannose structure

α-D-Mannose

Percentage in conformation
α-pyranose β-pyranose α-furanose β-furanose
67 33 0 0

Mannose is found as the main backbone in the galactomannans including guar, locust bean gum, cassia tora, fenugreek and tara. It is found in konjac mannan as a co-polymer with glucose and in xanthan as part of the side chain.


Gulose

Gulose structure

α-D-Gulose

Percentage in conformation
α-pyranose β-pyranose α-furanose β-furanose
22 78 0 0

Gulose is a raw sugar in nature but is found in alginate as the uronic acid derivative.


Idose

Idose structure

α-D-Idose

Percentage in conformation
α-pyranose β-pyranose α-furanose β-furanose
31 37 16 16

Galactose

galactose structure

α-D-Galactose

Percentage in conformation
α-pyranose β-pyranose α-furanose β-furanose
27 73 0 0

Galactose is found as the sidechain in the galactomannans including guar, locust bean gum, cassia tora, fenugreek and tara. It is also the basis of the main sugars in the carrageenans and agars as sulphated and methylated sugars. It is present in the uronic acid form as the main backbone sugar in pectin and is found in gum arabic and larch gum.


Talose

Talose structure

α-D-Talose

Percentage in conformation
α-pyranose β-pyranose α-furanose β-furanose
40 29 20 11


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