Dairy Chemistry And Biochemistry

MILK LIPIDS^143

Appendix 3B Structures of the principal polar lipids

O\\

I o\\

HZC -0-P -0- I

O\ H~C-0- C- R'

I o\ HC-O-C-F?

H2C- 0 - C - R1

HC-O-C-F? I 0,. +

I 0,. H,C-O-P-O-CH2CHZN(CH,),

OH I 0-

A Phosphatidic acid A phosphatidylcholine (lecithin)

O\\

O\\ H~C-0- C- R'

H~C-0-C-R' I o\\ +

I o\\ HC-O-C-R2 NH3

HC -0-c - R~ I o\\ I

H2C-O-P-O-CH2CH2NH3 I H2 I

I o\\ + HZC-0-P-0-C-CH

I 0 coo

0

A Phosphatidylethanolamine A phosphatidylserine

t

0

\\

H~C -o~c- R' '%-C-CHz

HC-O-C-R~ 1% 'R3C-CH

H~C-O~C-R' O\\

HC-O~C-R~ I\\ I

I\\ I o,\ \\ I

H2C-O-P-O-C-CH-CH20H HzC-0- P-0- C- CH- C-0- P- 0-CHp

I H2 I I H2 I Hz I

0' OH 0 OH 0

A phosphatidylglycerol A disphosphatidylglycerol (cardiolipin)

HHH HHH

I H?,

C-N-C-R

HO-C-C=C-(CH2)12CH3 HO-C-C=C-(CH2)12CH3

I

I

C-yH3

I

HzC-OH HZC-OH

Sphingosine A ceramide (R = fatty acid residue)

HHH HHH

I H?\ I Ho+

C-N-C --R C-N-C-R

HO-C-C=C-(CH2)12CH3 HO-C-C=C-(CH2)12CH3

I O,\ + I

H2C-O-P-O-CH2CH2N(CH3)3 H2C - 0 - glucose

I

A sphingomyelin A cerebroside

0