Chem 30B Homework 7
Name __________________
1. Name and draw the structure of the two essential fatty acids.
O
OH
Linolenic acid
O
OH
Linoleic
2. Rank the following fatty acids in terms of their melting points.
Lowest
___B___ ___C___ ___D___ ___A___ ___E___
A
B
OH
C
D
OH
O
Highest
O
O
3. Draw a lecithin using the two fatty acids below.
O
CH3 CH
CH
CH2 CH
CH
CH2 CH
CH
C
OH
O
CH3 CH2 CH
CH
CH2 CH
CH
CH
C
CH
CH2 C
OH
O
CH2 O
C
CH
CH
CH2 CH
CH
CH2 CH
CH
CH3
O
CH O
C
CH2 CH
O
CH2 O
P
O-
C
CH
CH
CH3
O
CH2 CH2 N+
CH3
CH3
CH
OH
OH
OH
O
E
CH2 CH
CH
CH2 CH3
O
4. Define fat and oil.
Fat – triglyceride that is solid at room temperature
Oil – triglyceride that is liquid at room temperature
5. Complete the following reaction. There is more than one possible answer.
O
CH2 O
C
CH
CH
CH2 CH
CH
CH2 CH
CH
CH2 CH2 CH3
O
CH
O
C
CH2 CH
CH
CH2 CH
CH
CH2 CH
CH
CH2 CH3
O
CH2 O
C
CH2 CH2 CH2 CH2 CH2 CH
CH
CH2 CH3
+ 3 H2
(Pt)
O
CH2 O
C
CH2 CH2 CH2 CH2 CH2 CH2 CH2 CH2 CH2 CH2 CH3
O
CH
O
C
CH2 CH
CH
CH2 CH
CH
CH2 CH
CH
CH2 CH3
O
CH2 O
C
CH2 CH2 CH2 CH2 CH2 CH
CH
CH2 CH3
6. Complete the following reaction.
O
CH2 O
C
CH
CH
CH2 CH
CH
O
C
CH2 CH
CH
CH2 CH
CH
CH3
9
O
CH2 O
CH2
7
O
C
CH2 CH3
10
+ 3 NaOH
O
Na+
CH2 OH
O-
C
CH
CH
CH2 CH
CH
OH
+
Na+ O-
C
CH2 CH
Na+ O-
C
CH
CH2 CH
9
O
CH2 OH
CH2
7
O
CH2 CH3
10
CH
CH3
7. Complete the following reaction.
O
CH2 O
C
CH
CH
CH2 CH
CH
O
C
CH2 CH
CH
C
CH2 CH
CH
CH3
9
O
CH2 O
CH2
7
O
CH2 CH3
10
+ 3 H2O
(H+)
O
CH2 OH
HO
C
CH
CH
CH2 CH
CH
OH
+
HO
C
CH2 CH
CH
CH2 CH
HO
C
CH
CH3
9
O
CH2 OH
CH2
7
O
CH2 CH3
10
8. Circle which of the following fatty acids are trans fatty acids.
OH
O
OH
O
OH
O
9. Construct a phospholipid containing two of the three fatty acids from problem #8 and
serine.
O
CH2 O
O
CH O
O
CH2 O
P
O
CH2 CH
O-
NH3+
C
O
O-