What is a beta glycosidic linkage?

The glycosidic linkage between sugars 1 and 2 is β because the bond is directed up from the anomeric carbon. The glycosidic linkage between sugars 2 and 3 is α because the bond is directed down from the anomeric carbon. To Your Health: Lactose Intolerance and Galactosemia.

There are are two types of glycosidic bonds – 1,4 alpha and 1,4 beta glycosidic bonds. 1,4 alpha glycosidic bonds are formed when the OH on the carbon-1 is below the glucose ring; while 1,4 beta glycosidic bonds are formed when the OH is above the plane.

Glycosidic bonds can be of the alpha or the beta type. An alpha-glycosidic bond is formed when both carbons have the same stereochemistry, whereas a beta-glycosidic bond occurs when the two carbons have different stereochemistry.

Lactose Is a disaccharide of two galactose and glucose. It has beta 1,4-glycosidic linkages.

Alpha linkage has the oxygen (on the aldehyde or ketone) below the ring and the beta has it above the ring. Down the page, it shows beta-Maltose. The label beta (for the right most oxygen) is unimportant since the link has to be alpha for it to be maltose. A beta link would result in a molecule of cellobiose.

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The alpha-1,4-glycosidic bond is the more common bond and it gives glycogen a helical structure that is suitable for energy storage. The alpha-1,6-glycosidic bond bonds are found about every ten or so sugars and these create branching points. Therefore, glycogen is a very branched polysaccharide.

Cellulose Is linear homopolysaccharide of D-glucose units, which are linked together by beta-1,4 glycosidic bonds. This makes option D correct answer.

A glycosidic bond (also known as glycosidic linkage)is created When the hemiacetal of a saccharide (or a molecule generated from a saccharide) reacts with the hydroxyl group of another substance, such as alcohol. Only sugars with the cyclic forms have an anomeric carbon and are capable of forming a glycosidic link.

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The glycosidic linkage between sugars 1 and 2 is β Because the bond is directed up from the anomeric carbon. The glycosidic linkage between sugars 2 and 3 is α because the bond is directed down from the anomeric carbon.

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