Disaccharides Flashcards
1
Q
what are disaccharides made of
A
two monosaccharides
2
Q
what are they joined together by
A
glycosidic bonds via a condensation reaction
3
Q
glucose+glucose–>
A
maltose
4
Q
glucose+galactose–>
A
lactose
5
Q
glucose+ fructose–>
A
sucrose
6
Q
define condensation reaction
A
joining two molecules together by removing water
7
Q
define hydrolysis reaction
A
splitting apart molecules through the addition of water
8
Q
Reducing Sugars test
A
1) add Benedicts reagent to the sample
2) Heat
3) if reducing sugar is present then sample will turn green, yellow or red depending on the concentration
9
Q
Non reducing sugar test
A
1) heat the new sample with dilute hydrochloric acid
2) neutralise the acid – adding sodium hydrocarbonate
3) heat the sample with Benedicts reagent
4) Non reducing: green, yellow or brick red
