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Home , Glycogen

STORAGE

Mrs. B. Dorka Vijaya Kumari Asst. Prof. in Govt. College for women (A), Guntur Polysaccharides

Storage Muco Polysaccharides Structural Polysaccharides Polysaccharides

Starch Glycogen

Cellulose

Chondroi Heparin Hyaluron tin ic acid Sulfate

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur STORAGE POLYSACCHARIDES

• These are which store reserve food material in & .

Ex: . in plants . Glycogen in animals . Inulin in some plants.

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur STARCH • Homopolymer of . • Reserve food material in plants.

• Arranged in concentric layers in the grains.

• When boiled, the central part dissolves and passes out.

• This soluble part is “”.

STARCH

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur • Insoluble portion is “". It absorbs water & swells.

• generally contain 10-20% Amylose & 80-90% Amylopectin.

• Starch on complete hydrolysis gives Glucose & partial hydrolysis gives .

STARCH

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur http://www.biologydiscussion.com/eukaryotic-cell/notes-on-cell-inclusions-with-diagram/6004

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur S T A R MRS. B. DORKA, ASST. PROF. IN BIOCHEMISTRY, GCW(A), C GUNTUR http://www.periodni.com/gallery/starch.png H STRUCTURE & PROPERTIES

• Starch is a of Glucose.

• α- D- glucose units are linked by α (1→4) linkage.

• Amylose is an unbranched chain.

• Amylopectin is branched. It has α (1→4) & α (1→6) linkage also.

STARCH

Mrs. B. Dorka, Asst. Prof. In Biochemistry, GCW(A), Guntur

• gives blue-black colour with Iodine.

• Amylopectin gives violet-red colour with Iodine.

• “Amylases” are the that hydrolyze starch.

• Amylases act on starch & gives maltose.

STARCH

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur https://ketopentose.files.wordpress.com/2013/02/starch.jpg

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur GLYCOGEN

• A storage in animals.

• Homoglycan, made of D- Glucose units.

• D- Glucose units are joined by α (1→4) and α (1→6) glycoside bonds like that of amylopectin.

GLYCOGEN

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur

Structure Of Glycogen

http://www.periodni.com/gallery/download_image.php?name=glycogen.png

• Glycogen is more branched than amylopectin.

• Stored in & muscle in compact form.

• Glycogen particles are spherical in shape.

• Acts as reserve food material during fasting

GLYCOGEN

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur INULIN • Inulin is a storage polysaccharide found is tubers of chicory, Dahlia and in the bulb of Onion. • A white crystalline powder.

• Made of D – units.

• Very easily hydrolyzed by acids. • Readily soluble in hot water.

• Doesn’t give characteristic colour with Iodine.

INULIN

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur Structure of Inulin

http://www.dynamicscience.com.au/tester/solutions1/chemistry/foodchemistry/inulin.htm

• Inulin is hydrolyzed by inulinase.

• It is levorotatory.

• It is an unbranched structure.

• Linkage is β (1 →2) between two fructose units.

• Inulin is used as commercial source of fructose.

INULIN

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur Points to Remember: . The sugars which store reserve food material in plants and animals are Storage Poly saccharides. Ex: Starch, Glycogen, Inulin etc

. Starch is S.P.S in plants, composed of D- Glucose. . Starch grain Contains Amylose α (1→4) & Amylopectin is α (1→4) & α (1→6).

. Glycogen is S.P.S in animals, composed of D- Glucose. Structure is similar to starch, but with extensive branching with both α (1→4) & α (1→6) linkages.

. Inulin is S.P.S in some plants, composed of D- Fructose linked by β (1 →2) . . Used as commercial source of fructose

Gist

M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur M r s . B . D o r k a , Asst. Prof. In Biochemistry, GCW(A), Guntur