LIPID IN LIFE

Lipids are nonpolar compounds that are not soluble in polar solvents like water, but he is soluble in nonpolar organic solvents such as ether. The structure shows it has a polar head and a hydrophobic tail ..
In an aqueous environment or circumstances, the head of the polar lipids are surface while the hydrophobic tails minimize contact with water. Nonpolar lipid tails formed by the lipid bilayer (two layers) and micelles. Micelles is a monolayer (one layer) that forms a circle. Micelles and lipid bilayer separating themselves from polar environments, is called the hydrophobic effect.

Lipids are usually classified by the type and number of C atoms it contains, but it can also be classified by other criteria or other compounds such as lipid binding that binds phosphorus group called phospilipid. Several classes of lipids:
a. Glycerides and fatty acids, including oil and grease,
b. Phospholipid,
c. Spingolipid,
d. Glycolipids, and
e. Terpenoids, including steroid sap.

One type of lipid is a lipid composed of fatty acids. Fatty acids are one of the raw materials for all lipids in living things. The fatty acids can be found in the free form (because fat is hydrolyzed) or in the form of glycerides.
Long chain fatty acids have C atoms, which usually amounts ranged from 14-24 carbon atoms. The longer the chain of atoms C, lipid will be more easily freeze and the sparingly soluble in water.
Fatty acids are divided into saturated fatty acids and unsaturated. Saturated fatty acids have only single bonds between atoms C compiler. While unsaturated fatty acid having at least one double bond between atoms C compiler.
Saturated fatty acids are more stable than unsaturated fatty acids. This is because the saturated fatty acids are not easily react with other compounds whereas unsaturated fatty acids more readily react because its double bond can be released and bind other compounds. The position of the double bonds also determines the reaction. The closer to the end, the double bonds react more easily.
The presence of double bonds in the unsaturated fat makes it have two forms cis and trans. Due polarisasai H atom, cis fatty acids have a chain curve. While trans fatty acids do not experience the strong polarization effects and the chain is relatively straight for his H lies opposite.
Lipid function for the body are:
1. As a composer or order the cell membrane and organelles.
2. Can be converted to oxidized saccharide as an energy source. Of lipids, ATP produced double the amount of ATP produced by Glycogen.
3. As the stored energy in fat tissue which at times can be adsorbed to oxidized.
4. Cytoplasm in order to insulate the synthesis and metabolism of substances more effectively. With the layer of fat / lipid metabolism and the chemical reaction is limited to a restricted environment only. So the use of the enzyme and the substrate becomes more efficient and the reaction becomes faster tempo.
5. As a precursor prostaglendin (prostate gland).
6. Launching adsorption of fat-soluble vitamins. For example, vitamin A, D, E, and K. Because these vitamins can only be digested, adsorbed, and distributed with the help of fat.