Food Biochemistry and Food Processing (2 edition)

BLBS102-c04 BLBS102-Simpson March 21, 2012 11:59 Trim: 276mm X 219mm Printer Name: Yet to Come

70 Part 1: Principles/Food Analysis

HOH 2 C

HOH 2 C

HOCH

HOCH O O

OH

HOH 2 C

HOCH

L-Ascorbic acid

L-Dehydroascorbic acid

OO

O

O O

O

O

Keto-form

2,3-Diketogulonic acid

O

O

HO

OH

OH

O

O O

HO

3-Deoxypentosone

Furfural

O

HO

Brown polymers 2,5-Dihydrofuroic acid

O

C

+ Amino acids

O

CHO

OH

H

O O

HO

OHHO

OH

Xylosone

Reductones

HO

HO

O

HO

Figure 4.10.Pathways of ascorbic acid degradation (solid line, anaerobic route; dashed line, aerobic route).