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Carbohydrate

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Carbohydrate You will need to memorize the structures of the following monosaccharides: D OH CH2OH ... – PowerPoint PPT presentation

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Title: Carbohydrate


1
Carbohydrate
  • You will need to memorize the structures of the
    following monosaccharides

??? D ????? ???? OH ???????? ??? CH2OH ??
????? ?????? ????? Dextro ?? ?? ????? ??????
????? ?? ????? ????? ??????.
2
L Levo ????? ?? ???????? ???? ??? OH ???
??????? ?? ????? ??????.????? ?? ??? isomers ??
???????? ???????? 2n ??? n ?? ??? asymmetric
carbons.
3
II. Glucose
  • Structure elucidation of glucose
  • 1- Molecular formulae C6H12O6
  • 2-

The reaction indicate that glucose contain
carbonyl groups
4
  • 3- Mild oxidation of glucose with bromine water
    gives gluconic acid, also glucose gives positive
    with tollens reagent, this means that glucose
    contains CHO group.
  • 4- Mild oxidation of glucose gives gluconic
    acid

5
  • 5-Strong oxidation gives glucaric acid (sacchric
    acid)

This reaction indicates that glucose contain
terminal primary alcohol
6
  • 6-

The above reaction showed that glucose is not
branched
7
  • 7-

The reaction shows that glucose contains five OH
groups
8
  • 8- glucose react with HCN to give cyanohydrin
    which gives heptanoic acid on hydrolysis
    followed by heating with HI

9
  • From above reactions, glucose has the
    following structure.
  • ???? ?? ????????? ??????? ???????? ????? ?????
    ?????
  • ??????Glucose ????? ???? ???? ?? ???? ???
    ???????
  • Glucose ????? ????? ????? ????? Osazone ?????
  • ????????? ???? ??? ???? ????? ???????? ???
    ?????? ???? .

10
  • Action of phenylhydrazine on glucose and fructose
    (formation of Osazone)
  • (A) Glucose

11
  • (B) Fructose

12
  • Question
  • write on the following
  • Action of phenylhydrazine on glucose.
  • Glucose and fructose give the same osazone.
  • Complete the following equation
  • Glucose 3 PhNHNH2

13
Conversion of glucose to fructose or conversion
of aldoses to ketoses
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