Dictionary » P » Polysaccharide



noun, plural: polysaccharides

(1) Any of a class of carbohydrates formed by repeating units linked together by glycosidic bonds.

(2) A complex carbohydrate composed of a chain of monosaccharides joined together by glocosidic bonds.


Polysaccharides (e.g. cellulose, starch, or glycogen) are characterized by the following chemical properties: (1) not sweet in taste, (2) insoluble in water, (3) do not form crystals when desiccated, (4) compact and not osmotically active inside the cells, (5) can be extracted to form white powder, and (6) general chemical formula of Cx(H2O) y.

Polysaccharides may be a homopolysaccharide or a heteropolysaccharide depending on their monosaccharide components. A homopolysaccharide consists of same types of monosaccharides whereas a heteropolysaccharide is composed of different types of monosaccharides.

Word origin: poly (many) + saccharide (sugar).


Compare: oligosaccharide, monosaccharide, disaccharide

See also: carbohydrate

Related terms:

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adherence to host cell-capsule hindrance

... resist attachment of complement to their cellular surfaces, and can evade these mechanisms of the host immune system. However, the bacterial polysaccharide is directly antigenic, so antibody response against different capsular polysaccharides will eventually be built by the host, rendering ...

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by PsycoCarrot
Fri Jul 06, 2012 11:48 pm
Forum: Microbiology
Topic: adherence to host cell-capsule hindrance
Replies: 1
Views: 4142


Eukaryotes: Animalia - No cell wall Plantae - Cellulose Fungi - Chitin Protoctista - Sometimes a cell wall, polysaccharide Prokaryotes: Bacteria - Peptidoglycan Archaea - Sometimes a cell wall, but never peptidoglycan If you accidentally had Caps Lock on, I apologise for the ...

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by billyfisher100
Sat Jan 21, 2012 1:26 pm
Forum: General Discussion
Replies: 2
Views: 7181

Bacterial Polysaccharides Cellular Localization

Hello all, I'm currently involved in a research that deals with polysaccharides degradation/utilization by bacteria in the human gut. I used a tool called pSORTb which predicts the cellular localization of proteins. In the results I get, many enzymes which ...

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by omereilam
Wed Dec 21, 2011 3:11 pm
Forum: Microbiology
Topic: Bacterial Polysaccharides Cellular Localization
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Views: 3305

Re: fructose as a monomer for a polysaccharide

I'm really appreciate it dear Daniel.kurz.

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by Maatomaat
Wed Nov 23, 2011 3:12 am
Forum: Cell Biology
Topic: fructose as a monomer for a polysaccharide
Replies: 9
Views: 13755

Re: fructose as a monomer for a polysaccharide

So I went back to my biochemistry textbook to find the exact wording that will satisfy everyone. I was using an incomplete explanation. The way that it goes is that the anomeric carbon (the carbon adjacent to the oxygen in the sugar ring is the one that makes the ketone group in the open ring form a...

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by daniel.kurz
Tue Nov 22, 2011 11:44 pm
Forum: Cell Biology
Topic: fructose as a monomer for a polysaccharide
Replies: 9
Views: 13755
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