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Waxes

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Waxes

Thar she blows!

From the 1700s up to the late 1900s, whalers searched the ocean for the sperm whale.  Whaling was a dangerous occupation – the prey averaged about fifty feet in length.  But when successful, the search was worth it.  One large whale could produce up to 500 gallons of oil, valuable for making candles, ointments, cosmetic creams, and industrial lubricants. In 1988, sperm whales (and other whale species) were placed under international protection because their numbers were diminishing rapidly.  Today, various vegetable oils are used in place of whale oils.

Waxes

Another category of lipid molecule is waxes.  Waxes are esters of long-chain fatty acids and long-chain alcohols.  Waxes are soft solids with generally low melting points and are insoluble in water.  The Figure below shows the structure of cetyl palmitate, a natural wax present in sperm whales.

Cetyl palmitate belongs to the category of compounds called waxes. It is derived from a fatty acid that is 15 carbons in length and an alcohol that contains 16 carbon atoms.

One of the best known natural waxes is beeswax, though many other animals and plants synthesize waxes naturally.  Waxes can be found on leaves of plants and on the skin, hair, or feathers of animals, where they function to keep these structures pliable and waterproof.  Humans take advantage of the protective properties of natural and synthetic waxes in such applications as floor polish and car wax.

Summary

  • The structure of waxes is shown.
  • Properties of waxes are described.
  • Common waxes are listed.

Practice

Read the material at the link below and answer the following questions:

http://lipidlibrary.aocs.org/lipids/waxes/index.htm

  1. Besides wax esters, what other organic components can be found in waxes?
  2. What is another name for wool wax?
  3. What are the three major non-polar lipids on the skin surface of humans?

Review

  1. What is a wax?
  2. Name two properties of waxes.
  3. Name a wax found in sperm whales.

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