Biomedical Engineering Reference
In-Depth Information
2.3.2.1.2. KETOSES
Ketoses and aldoses share the same stoichiometrical formula. All sugars have a stoichiom-
etry of C
n
H
2n
O
n
. A ketose is a sugar having the C
]
O double bond located next to the end
carbon when the sugar molecule is represented linearly.
a.
Ketohexoses
CH
2
OH
CO
CH
2
OH
CO
CH
2
OH
CO
CH
2
OH
CO
HCOH
HCOH
HCOH
HOCH
HCOH
HCOH
HCOH
HOCH
HCOH
HOCH
HOCH
HCOH
CH
2
OH
CH
2
OH
CH
2
OH
CH
2
OH
D
-psicose
D
-fructose
D
-sorbose
D
-toatose
Important ketohexoses:
CH
2
OH
CO
CH
2
OH
CH
2
OH
HO
HO
C
C
HOCH
HCOH
HCOH
HOCH
HCOH
HCOH
HOCH
HCOH
HC
O
O
CH
2
OH
H
2
C
CH
2
OH
D
-fructose, linear
D
-fructose, pyranose structure
D
-fructose, furanose structure
HO
HO
O
HO
O
HO
OH
OH
OH
OH
OH
HO
β
-
D
-fructofuranose (Sweetest sugar)
β
-
D
-fructopyranose
b.
Ketopentoses
CH
2
OH
CO
CH
2
OH
CO
HOCH
HCOH
HCOH
HCOH
CH
2
OH
CH
2
OH
D
-xylulose
D
-ribulose
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