1. Chapter 18 Naturally Occurring Nitrogen-Containing Compounds
Amino Acids: Structure and Properties
Hydrophobic, Hydrophilic, acidic and basic side groups
Essential Amino acids - not synthesized in the body, must be ingested
Non-essential Amino acids - synthesized internally
Titration of Amino Acids 3 1

2. Chapter 18 Naturally Occurring Nitrogen-Containing Compounds
Amino Acids: Structure and Properties
Structure of Amino Acids (20 common amino acids found in proteins)
hydrophobic side chain groups (nonpolar side chain)
ala, gly, ile, met, phe, pro, trp, val
hydrophilic side chain groups (polar side chain)
asn, gln, ser, thr
Acidic side chain groups
asp, glu, cys, tyr
Basic side chain groups
arg, his, lys
Properties of Amino Acids
pKa of -CO2H, pKa of -NH3+, pKa of side chain and isoelectric point called PI
Electrophoresis -separation based on electric charge. Positive charged moves towards negative electrode and negative charged towards positive electrode 3 3