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IodinePotassium Test Presence of Starch

Iodine solution reacts with starch
Results in a colour change from orangebrown to blueblack
Qualitative test accurate concentration cannot be determined
The depth of blueblack gives an idea of relative concentration
Like Benedict's, it is qualitative

IF STARCH IS PRESENT IN THE SOLUTION BEING TESTED:…

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Liner, unbranched molecules
Consists of alpha1, 4 glycosidic bonds
Coils into an alphahelix

AMYLASE

Chains of glucose monomers joined with alpha 1,4 glycosidic bonds
Crosslinked with alpha1, 6 glycosidic bonds. Results in a branched structure

Polysaccharides Glycogen

Main storage product in animals
Similar to amylopectin in that it has both…

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Building blocks for larger molecules (i.e. disaccharides and polysaccharides)
Intermediates in reactions
Constituents of nucleotides (e.g. deoxyribose in DNA and ribose in RNA, ATP and ADP)
Intermediates in reactions (trioses are intermediates in reactions of respiration)

Polysaccharides Chitin

STRUCTURE

Structural polysaccharide
Resembles cellulose, but has added amino acids forming a…

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Gives an accurate measurement of blood glucose


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