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Biological molecules Monomer – small repeating units that for a polymer
Test for reducing sugars – benedict reagent – add food sample to test tube (if not liquid
grind with water) – add benedict’s reagent – heat – colour change from blue to red.
Condensation reaction- monosaccharides join to form disaccharides – loss of water molecule
– glycosidic bond formed between sugars
Hydrolysis- addition of water breaks bonds between molecules– glycosidic bond broken
between disaccharides during hydrolysis
Glucose + glucose = maltose
Glucose + fructose = sucrose
Glucose + galactose = lactose
Test for non-reducing sugars – carried out if reducing test was negative – add HCL to sample-
neutralise with sodium hydrogen carbonate – carry out benedict’s test – if test is positive
original sample will turn from blue to brick red.
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