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Chapter 8 · Products with a Little Twist - Starch
8
dehyde starch” is formed, which can then react to
the “dicarboxylic starch” (. Fig. 8.10, path C).
The distribution of the modified starches to
the corresponding fields of application is shown
in . Fig. 8.11.
If oxidation is carried out using periodic acid
or periodate, the glucose ring is cleaved between
the two vicinal (i.e. adjacent) hydroxyl groups
on the carbon atoms C2 and C3, preserving the
polymeric structure of the starch. First the “dial. Fig. 8.10 Oxidation of
starch
O
O
OH
OH
OH
OH
O
OH
OH
OH
Ox.
OH
OH
OH
OH
OH
O
O
O
OH
OH
O
O
O
OH
OH
O
HO
Ox.
Ox.
Ox.
Ox.
O
O
OH
O
O
O
OH
O
COOH
HOOC
Oxidative cleavage
of vicinal diols
Oxidation on C6
Oxidation on C1
Dicarboxylic
starch
6-Carboxy
starch
Dialdehyde
starch
Starch
Oxidative cleaved
starch
C
A
B
. Fig. 8.11 Use of
modified starches
Paper
Cardboard and
adhesives
Other food
products
Others
51%
Fruit preparations/
dairy products
17%
15%
11%
6%