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Chemical structure of stachyose
Chemical structure of stachyose

A tetrasaccharide is a carbohydrate which gives upon hydrolysis four molecules of the same or different monosaccharides. For example, stachyose upon hydrolysis gives one molecule each of glucose and fructose and two molecules of galactose. The general formula of a tetrasaccharide is typically C24H42O21.

Structure and occurrence of tetrasaccharides
Name chemical compound function/occur
Lychnose (1-α-Galactosyl-raffinose) O-α-D-Galp-(1→6)-O-α-D-Glup-(1→2)-O-β-D-Fruf-(1→1)-O-α-D-Galp
Maltotetraose O-α-D-Glcp-(1→4)-O-α-D-Glcp-(1→4)-O-α-D-Glcp-(1→4)-D-Glcp in Starchsyrup
Nigerotetraose O-α-D-Glcp-(1→3)-O-α-D-Glcp-(1→3)-O-α-D-Glcp-(1→3)-D-Glcp
Nystose (β-D-Fructosyl-1-kestose) O-α-D-Glcp-(1→2)-β-D-Fruf-(1→2)-β-D-Fruf-(1→2)-β-D-Fruf
Sesamose O-α-D-Galp-(1→6)-O-α-D-Galp-(1→6)-O-β-D-Fruf-(2→1)-O-α-D-Glcp
Stachyose O-α-D-Galp-(1→6)-O-α-D-Galp-(1→6)-O-α-D-Glcp-(1→2)-β-D-Fruf widespread in plants (artichoke, soybean)