Cellulose

The linear polysaccharide cellulose is composed of ( + )-d-glucose units and its relative molecular mass ranges from 2.5 x 105 to 1 x 106 or more. The long chains are arranged on a partially crystalline fibre structure and held together by numerous hydrogen bonds between the hydroxyl groups. The hydrolysis of cellulose with 2.5 mol hydrochloric acid at c. 100°C removes amorphous material and yields a more crystalline polymer called 'microcrystalline cellulose' and marketed as Avicel by several companies.

The mechanism of chiral recognition is not yet completely clarified even though a significant role is attributed to the cellulose structure and to the hydr-oxyl groups, the protection of which with BrCN resulted in the loss of chiral recognition. The optical antipodes resolved are highly polar, such as amino acids, with multiple sites for hydrogen bond formation.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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