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Amino Acids

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Amino Acids (Chapter 37B) General Structures. Two contrasting groups -COOH acidic ... Less acidic and basic than normal RCOOH and RNH2. COO- C H3N. H. R ... – PowerPoint PPT presentation

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Title: Amino Acids


1
Amino Acids
  • (Chapter 37B)

2
General Structures
  • Two contrasting groups
  • -COOH acidic
  • -NH3 basic
  • ?-amino acids
  • 20 different ?-amino acids found in protein in
    nature

?
3
Some amino acids
4
Chirality
COO-
  • L-amino acid
  • Look down at H-C bond, other groups, read
    clockwise (corn law)

C
R
H3N
H
5
Special features
  • High m.p. and b.p.
  • Glycine (RH) is a solid
  • Soluble in water
  • High dipole moment
  • Less acidic and basic than normal RCOOH and RNH2

6
Amphoteric
7
Isoelectric point
pH at which the concentrations of (II) (III) is
called the isoelectric point.
8
Separating amino acids
  • Chromatography

9
Separating amino acids
  • Electrophoresis

10
Peptide Linkage
11
Proteins
  • Polypeptides
  • About 20 amino acids
  • Number of possible protein polymers is very large

12
Proteins
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