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Table 2 Structural composition of different dietary fibres (note- “soluble” may indicate “partially soluble” (modified from [9])

From: “Dietary fibre”: moving beyond the “soluble/insoluble” classification for monogastric nutrition, with an emphasis on humans and pigs

DF Solubility Main unit Branch units References
Cellulose Insoluble β- (1,4) Glucose [53]
Lignin Insoluble Polyphenols Polyphenols [54]
Resistant starches Insoluble Helical amylose 1,6 glucose in amylopectin [55]
Mix-linkage glucans Soluble β- (1,3) glucose [56,57,58]
β- (1,4) glucose
Hemicelluloses
Arabinoxylan
Xyloglucan
Galactomannans
Soluble
Soluble
Soluble
Xylose
Glucose
Mannose
Arabinose
Xylose
Galactose
Glucose
[56]
Pectins Soluble Galacturonic acid with methoxy groups Arabinose
Galactose
[59]
Gums
Guar
Agar
Soluble
Soluble
β −1,4-linked mannose
D-galactose & (3,6) anhydro-L-galactose
Galactose
-
[60]
Non-digestible oligosaccharides
Fructooligosaccharide
Galactooligosaccharide
Soluble
Soluble
D-fructose residues
Galactose, with terminal glucose unit.
-
-
[61, 62]