METABOLISM OF LIPIDS
, Functions:
• Energy source: 1 gram of fat releases 9 kcal of energy.
• Energy storage (triglycerides).
• Cell membrane structural components: phospholipids,
sphingolipids, and steroids.
• Hormones: steroid hormones and prostaglandins.
• Vitamin absorption. Dietary fat serves as a carrier of the
lipid-soluble vitamins.
• Protection. Fats serve as a shock absorber, or protective
layer, for the vital organs.
• Insulation. Fat stored beneath the skin (subcutaneous
fat) serves to insulate the body from extremes of cold
temperatures.
,CLASSIFICATION OF LIPIDS
, Simple lipids
Fatty acids. Saturated fatty acids.
СН3 ̶ (СН2)14 – СООН palmitic acid (С16)
СН3 − (СН2)16 – СООН stearic acid (С18)
Monounsaturated fatty acids
СН3-(СН2)5-СН=СН-(СН2)7 – СООН
palmitooleic acid
СН3-(СН2)7-СН=СН-(СН2)7 – СООН oleic acid
, Functions:
• Energy source: 1 gram of fat releases 9 kcal of energy.
• Energy storage (triglycerides).
• Cell membrane structural components: phospholipids,
sphingolipids, and steroids.
• Hormones: steroid hormones and prostaglandins.
• Vitamin absorption. Dietary fat serves as a carrier of the
lipid-soluble vitamins.
• Protection. Fats serve as a shock absorber, or protective
layer, for the vital organs.
• Insulation. Fat stored beneath the skin (subcutaneous
fat) serves to insulate the body from extremes of cold
temperatures.
,CLASSIFICATION OF LIPIDS
, Simple lipids
Fatty acids. Saturated fatty acids.
СН3 ̶ (СН2)14 – СООН palmitic acid (С16)
СН3 − (СН2)16 – СООН stearic acid (С18)
Monounsaturated fatty acids
СН3-(СН2)5-СН=СН-(СН2)7 – СООН
palmitooleic acid
СН3-(СН2)7-СН=СН-(СН2)7 – СООН oleic acid
