Wine Chemistry and Biochemistry

7 Carbohydrates 233

CHO

H OH

HO H

H OH

H OH

CH 2 OH

O

HO

HO

OH

OH

OH

O

HO

HO

OH

OH

OH

OH

OH

HO

HO O

HO

OH

H

O

OH

HO O

HO

a-D-Glucopyranose b-D-Glucopyranose

a-D-Glucofuranose b-D-Glucofuranose

CH 2 OH

O

HO H

H OH

H OH

CH 2 OH

O

HO

HO

OH

OH

O

HO

HO

OH

OH

OH

OH

HO

O

OH

HO

OH

O

a-D-Fructopyranose b-D-Fructopyranose

a-D-Fructofuranose b-D-Fructofuranose

OH

HO HO

OH

OH

OH

A

B

Fig. 7.1Glucose (A) and fructose (B) tautomeric forms