Topic 1.2.2 - Disaccharides Flashcards

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1
Q

What are disaccharides made from?

A

2 monosaccharides

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2
Q

What reaction joins the 2 monosaccharides?

A

Condensation

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3
Q

What type of bond joins the monosaccharides together to form a disaccharide?

A

Glycosidic bond

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4
Q

What molecule is removed in the formation of a disaccharide?

A

Water

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5
Q

What 2 monosaccharides form sucrose?

A

alpha glucose and fructose

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6
Q

What 2 monosaccharides form lactose?

A

alpha glucose and beta galactose

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7
Q

What 2 monosaccharides form maltose?

A

alpha glucose and alpha glucose

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8
Q

Is sucrose a reducing sugar?

A

no

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9
Q

Name 3 reducing sugars

A

fructose
ribose
maltose
lactose

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10
Q

Test for reducing sugars

A

1) Add benedict’s solution containing copper ions
2) Heat in a water bath
3) Reducing sugar reacts with the benedict’s and reduces copper ions to a +1 charge
4) Colour change from blue to brick red

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11
Q

Test for non- reducing sugars

A

1) Heat the non reducing sugar with a few drops of HCl
2) Neutralise with sodium carbonate
3) Produces monosaccharides which will give a positive benedict’s test

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12
Q

Why do we add HCl to a non reducing sugar?

A

Hydrolyses glycosidic bonds

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13
Q

3 main disaccharides

A

Sucrose
maltose
lactose

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