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Lipids are hydrocarbons that are found in living systems in the environment The main classes of lipids are triglycerides waxes steroids phospholipids gylcolipids and sphingolipids Glanze The simplest lipid which makes up the backbone of all of these is the fatty acid see page 2 The main characteristics that separate the different kinds of lipids are the derivatives such as acids alcohols amines amino alcohols and aldehydes found on the end of the hydrocarbons and their solubility in water Most lipids are nonpolar and there for are not soluble in water but instead in fat solvents such as ether chloroform and benzene From these two basic distinctions there are dozens of possible lipids that can be formed in nature and synthetically Cooper Triglycerides are compounds consisting of a fatty acid oleic palmitic or stearic and a glycerol See page 2 Triglycerides make up most animal and vegetable and are the principal lipids in the blood where they circulate bound to proteins forming high- and low-density lipo-proteins examples of which are lard and butter This type of lipid is not soluble in water but is soluble in substances like ether and benzene Glycerol is an alcohol and is soluble in ethyl alcohol and water The other main component in is the fatty acid Fatty acids are any of several organic acids that are unsaturated molecules and cannot be produced by the body Therefore fatty acids have to be ingested in an animals diet Cooper Waxes are fatty esters of long-chain alcohols See page 3 Theses can be derived from insects such as beeswax plants or petroleum products There are four main uses for waxes in society There is a bone wax that is a nontoxic biocompatible wax used during surgery to plug up cavities in cranial bones and other bones to control bleeding Because waxes are insoluble in water they are very useful for the use on humans Another form of wax is the
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