Saturated and Unsaturated Fatty Acids

Notes on Saturated and Unsaturated Fatty Acids. Phospholipid bilayer.

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Pooja Patel
Saturated and Unsaturated Fatty Acids
Saturated: All carbon-carbon bonds are single
Triglycerides with saturated fatty acids have a high melting point and tend
to be found in warm-blooded animals. At room temperature they are solids
(fats), e.g. butter, lard.
Monounsaturated: One carbon-carbon double bond
Polyunsaturated: It has more then one carbon-carbon double bond
Triglycerides with unsaturated fatty acids have a low melting point and
tend to be found in cold-blooded animals and plants.
At room temperature they are liquids (oils), e.g. fish oil, vegetable oils.
Phospholipid molecules consist of two fatty acids and a phosphate group
bonded to a molecule of glycerol.
When mixed with water, phospholipids form
droplet spheres with a double-layered
phospholipid bilayer. The hydrophilic heads
facing the water, and the hydrophobic tails
facing each other. They are the basis of
biological membranes.

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