Disaccharides

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6 Terms

1
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disaccharide

  • two monosaccharides formed by condensation reaction

2
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what type of bond

glycosidic - forms between 2 monosacc.

3
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Maltose

  • glucose + glucose

  • amylase breaks down starch forming maltose

  • alpha 1,4 glycosidic linkage

<ul><li><p>glucose + glucose </p></li><li><p>amylase breaks down starch forming maltose </p></li><li><p> alpha 1,4 glycosidic linkage </p></li></ul><p></p>
4
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lactose

  • glucose + galactose

  • reducing sugar

  • b - 1,4 glycosidic bond

<ul><li><p>glucose + galactose </p></li><li><p>reducing sugar </p></li><li><p>b - 1,4 glycosidic bond </p></li></ul><p></p>
5
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sucrose

  • glucose + fructose

  • non - reducing sugar

  • alpha 1,2 glycosidic linkage

HAS A PENTAGON

<ul><li><p>glucose + fructose </p></li><li><p>non - reducing sugar </p></li><li><p>alpha 1,2 glycosidic linkage </p></li></ul><p><strong>HAS A PENTAGON </strong></p><p></p>
6
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Test for Non-Reducing

  • reducing sugars have a free carbonyl which donates electrons to reduce cu2+ into a red precipitate of cu+

  • sucrose is a non-reducing sugar - boil with dilute hcl, the neutralize with NaHCO3 until effervescence stops, then heat with benedicts