葡萄糖、果糖、半乳糖、蔗糖、澱粉、纖維素：α 與 β 鏈結之方式 The α and β -OH positions and linkages of monosaccharides, disaccharides, and polysaccharides

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Carbohydrates Fundamentals

 

 Haworth Formula

 

 

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Galactose

 he (這是原文的錯字, 應該是 The) Beta position is defined as the -OH being on the same side of the ring as the C # 6. In the chair structure this results in a horizontal projection (Haworth - an upwards projection 指 -OH 朝上). The Alpha position is defined as the -OH being on the opposite side of the ring as the C # 6. In the chair and Haworth structure this results in a downward projection. (指 -OH 朝下)

 

 Glucose (Dextrose)

 

 

 

 

Fructose

Compare Alpha and Beta Fructose

The Beta position is defined as the -OH being on the same side of the ring as the C # 6.

 

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Disaccharides

 

Lactose

Sucrose

The Alpha position is defined as the ether oxygen being on the opposite side of the ring as the C # 6

 

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 Polysaccharides

 

 Starch

 The Alpha position is defined as the ether oxygen being on the opposite side of the ring as the C # 6

All of the monomer units are alpha -D-glucose, and all the alpha acetal links connect C #1 of one glucose and C #4 of the next glucose.

 

 

Glycogen

All of the monomer units are alpha-D-glucose, and all the alpha acetal links connect C # 1 of one glucose to C # 4 of the next glucose.

Cellulose

All of the monomer units are beta-D-glucose, and all the beta acetal links connect C # 1 of one glucose to C # 4 of the next glucose.