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Two forms of starch
Amylose Amylopectin
Amylose is a polymer of glucose Amylopectin is a polymer of
joined together by -1,4- glucoses joined by -1,4-
glycosidic bonds. Forms a glycosidic bonds but with
helix with 6 glucose branches of -1,6-glycosidic
molecules per turn and about bonds. This causes the
300 per helix. molecule to be branched
rather than helical.
Amylopectin molecules may
contain up to two million
glucose units.
Amylose double helical crystal structure…read more

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Similarities & Differences between
Amylose and Amylopectin
Similarities Differences
Both Amylose and Amylopectin are Amylose is an unbranched chain of
mainly stored in polysaccharides in glucose where the bond connects carbon
atom number 1 in one glucose to carbon
plants. atom number 4 in the other glucose.
Whereas Amylopectin is a branched
polymer as it has a glycosidic link from
carbon atom number 6 to carbon atom
number 1 in a new glucose molecule.
Amylose is a long unbranched chain of
glucose, it has a cylinder like structure
which it good for storage.
Amylopectin is a long branched chain of
glucose, its structure is a benefit
because enzymes that break glycosidic
bonds to break down the molecule get to
it faster. This means glucose is released
faster.…read more

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Glycogen
Glucose is stored as glycogen in
animal tissues by the process of
glycogenesis. Like Amylopectin, it
also consists of a-1,4 linkages and
a-1,6 linkages, however it has even
more branching and more glucose
units are present than in
Amylopectin. The structure of
glycogen consists of long polymer Section of Glycogen Showing ­1,4­ and
chains of glucose units connected ­1,6­Glycosidic Linkages
by an alpha acetal linkage.
Glycogen molecule has many side
branches which means it can be
broken down very rapidly.…read more

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