DAVID ADAIR FERNÁNDEZ MORGAN

ASAEL MIGUEL LÓPEZ

OMAR JIMÉNEZ COCA

ISRAEL FERNÁNDEZ DOMÍNGUEZ

Lipids

WHAT ARE THEY?

•Water insoluble compunds usually composed of an

alcohol and one or more carboxylic acid molecules.

•They include: Animal fats, vegetable oils and waxes.

Fats and oils are esters of glycerol, an alcohol that

contains 3 (OH) Groups.

Each molecule of a fat or an oil contain three ester groups resulting

from the 3 carboxylic acid molecules joined to one glycerol

molecule.

FUNCTIONS OF LIPIDS!

•They have two major biochemycal roles in the

body:

•Store excess energy when an organism

porcesses more food than it needs.

•Form membranes surronding cells and

components

Clasification of lipids

• Lipids are divided in two groups:

Simple lipids Complex lipids

Phospholipids Vegetable oils

Glucolipids Waxes

Esteroids Fats

Cromolipids

PHOSPHOLIPIDS

• Glyceride found in living cells and cell membranes. They have two fatty acids esterified to glycerol. has an ionic “head” soluble in water, and a “tail” that is insoluble.

GLUCOLIPIDS

• Components formed by a carbohydrate that can be glucose or galactose, and a fatty acid and an alcohol. Other words lipids that contain D-glucose.

STEROIDS

• A lipid with a four-ring structure. Include cholesterol, sex hormones, vitamine D and bile salts.

OILS AND FATS

• Contain fatty acids, fats have small percentage of unsaturated fatty acids, oils contain few saturated fatty acids.

• A liquid lipid obtained from a plant source its called an oil.

• A semisolid lipid obtained from an animal source is called a fat.

• The distinction of a fat and an oil is based on the saturation of the fatty acids.

WAXES

•Obtained from heavy crude oil. Its a mixture of a long chain alkanes. A lipid wax is a mixture of naturally ocurring esters of fatty acids and long chains alcohols.

INTERNET REFERENCES

• http://www2.chemistry.msu.edu/faculty/reusch/virttxtjml/lipids.htm

• http://www.chem4kids.com/files/bio_lipids.html