Zetmeel en zetmeelderivaten - Chemische Feitelijkheden
Zetmeel en zetmeelderivaten - Chemische Feitelijkheden
Zetmeel en zetmeelderivaten - Chemische Feitelijkheden
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197–4 <strong>Zetmeel</strong><br />
6<br />
CH2OH<br />
5<br />
H<br />
O<br />
H<br />
4<br />
OH H<br />
H<br />
1<br />
O 1<br />
C<br />
2<br />
H C<br />
3<br />
HO C<br />
4<br />
H C<br />
H<br />
OH<br />
H<br />
OH<br />
6<br />
CH2OH 5<br />
H<br />
O<br />
H<br />
4<br />
OH H<br />
OH<br />
1<br />
HO<br />
3<br />
H<br />
OH<br />
2<br />
OH<br />
H<br />
5<br />
C OH<br />
6<br />
CH2OH HO<br />
3<br />
H<br />
H<br />
2<br />
OH<br />
α-D-glucose aldehyde-vorm<br />
β-D-glucose<br />
Figuur 1. De lineaire <strong>en</strong> ringvormige structur<strong>en</strong> van glucose. De koolstofatom<strong>en</strong><br />
in glucose word<strong>en</strong> altijd op dezelfde manier g<strong>en</strong>ummerd: C1 t/m C6.<br />
2.2 Amylose <strong>en</strong> amylopectine<br />
<strong>Zetmeel</strong> k<strong>en</strong>t twee verschill<strong>en</strong>de chemische vorm<strong>en</strong>: amylose <strong>en</strong><br />
amylopectine (zie Figuur 2).<br />
O<br />
CH2OH<br />
O<br />
OH<br />
OH<br />
CH2OH O<br />
OH<br />
HO<br />
6<br />
CH2OH 5 O<br />
CH2OH<br />
O<br />
4<br />
OH 1<br />
O<br />
O<br />
2<br />
3<br />
OH<br />
CH2OH O<br />
41 <strong>Chemische</strong> Feitelijkhed<strong>en</strong> september 2003<br />
O<br />
O<br />
OH<br />
OH<br />
CH2OH<br />
O<br />
OH<br />
O<br />
OH<br />
O<br />
OH<br />
CH2 O<br />
OH<br />
O<br />
OH<br />
OH<br />
OH<br />
CH2OH<br />
O<br />
OH<br />
O<br />
OH<br />
O<br />
CH2OH O<br />
OH<br />
O<br />
CH2OH O<br />
OH<br />
OH<br />
OH<br />
CH2OH<br />
O<br />
OH<br />
O<br />
OH<br />
O<br />
CH2OH O<br />
O<br />
amylopectine<br />
amylose<br />
OH<br />
O<br />
OH<br />
CH2OH O<br />
OH<br />
OH<br />
CH2<br />
O<br />
OH<br />
OH<br />
O<br />
O<br />
CH2OH O<br />
OH<br />
OH<br />
CH2OH<br />
O<br />
OH<br />
OH<br />
O<br />
O<br />
CH2OH O<br />
OH<br />
OH<br />
CH2OH<br />
O<br />
Figuur 2. De structur<strong>en</strong> van amylose (lineair glucoseket<strong>en</strong>) <strong>en</strong> amylopectine<br />
(vertakte glucoseket<strong>en</strong>).<br />
OH<br />
OH<br />
O<br />
O<br />
0886-0352<br />
0886-0353