Nsr

ch2oh

D-Erythrulose

Dihydroxyacetone

FIGURE 7-3 Aldoses and ketoses. The series of (a) d-aldoses and (b) d-ketoses having from three to six carbon atoms, shown as projection formulas. The carbon atoms in red are chiral centers. In all these d isomers, the chiral carbon most distant from the carbonyl carbon has the same configuration as the chiral carbon in d-glyceraldehyde. The sugars named in boxes are the most common in nature; you will encounter these again in this and later chapters.

Six carbons

ch2oh

ch2oh

C=°

C=°

H—C—OH

HO—C—H

H—C—OH

H—C—OH

H—C—OH

H—C—OH

CH2OH

CH2OH

D-Psicose

D-Fructose

ch2oh

ch2°h

C=°

C=°

H—C—OH

HO—C—H

HO—C—H

HO—C—H

H—C—OH

H—C—OH

CH2OH

CH2OH

D-Sorbose

D-Tagatose

Essentials of Human Physiology

Essentials of Human Physiology

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