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, lipide
Biochem any of a large group of organic compounds that are esters of fatty acids (simple lipids, such as fats and waxes) or closely related substances (compound lipids, such as phospholipids): usually insoluble in water but soluble in alcohol and other organic solvents. They are important structural materials in living organisms


One of a class of compounds which contains long-chain aliphatic hydrocarbons (cyclic or acyclic) and their derivatives, such as acids (fatty acids), alcohols, amines, amino alcohols, and aldehydes. The presence of the long aliphatic chain as the characteristic component of lipids confers distinct solubility properties on the simpler members of this class of naturally occurring compounds.

The lipids are generally classified into the following groups:

  • A. Simple lipids
    • 1. Triglycerides or fats and oils are fatty acid esters of glycerol. Examples are lard, corn oil, cottonseed oil, and butter.
    • 2. Waxes are fatty acid esters of long-chain alcohols. Examples are beeswax, spermaceti, and carnauba wax.
    • 3. Steroids are lipids derived from partially or completely hydrogenated phenanthrene. Examples are cholesterol and ergosterol.
  •  B. Complex lipids
    • 1. Phosphatides or phospholipids are lipids which contain phosphorus and, in many instances, nitrogen. Examples are lecithin, cephalin, and phosphatidyl inositol.
    • 2. Glycolipids are lipids which contain carbohydrate residues. Examples are sterol glycosides, cerebrosides, and plant phytoglycolipids.
    • 3. Sphingolipids are lipids containing the long-chain amino alcohol sphingosine and its derivatives. Examples are sphingomyelins, ceramides, and cerebrosides.

Lipids are present in all living cells, but the proportion varies from tissue to tissue. The triglycerides accumulate in certain areas, such as adipose tissue in the human being and in the seeds of plants, where they represent a form of energy storage. The more complex lipids occur closely linked with protein in the membranes of cells and of subcellular particles. More active tissues generally have a higher complex lipid content; for example, the brain, liver, kidney, lung, and blood contain the highest concentration of phosphatides in the mammal. See Fat and oil, Fat and oil (food), Glycolipid, Sphingolipid, Steroid, Terpene, Triglyceride, Vitamin, Wax, animal and vegetable


One of a class of compounds which contain long-chain aliphatic hydrocarbons and their derivatives, such as fatty acids, alcohols, amines, amino alcohols, and aldehydes; includes waxes, fats, and derived compounds. Also known as lipin; lipoid.
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In the final step, each type of lipid is run through a mass spectrometer to measure the abundance of the [sup.
Lipid Structures (beta) identifies and links lipid names or synonyms in articles on SciVerse ScienceDirect, providing the user with supporting information on each particular lipid in context, such as the structure and other key information for that molecule as represented on the LIPID MAPS™ website.
Results: The proton acceptor component of surface energy was shown to correlate quantitatively with the hydration density of the lipid bilayer and its optional PEG cover.
SimLipid profiles lipids by matching the experimental MS spectra with its own comprehensive, robust and annotated database, consisting of 8 lipid categories and 21905 lipid species.
Evaluation of serum lipid levels in chronic obstructive pulmonary disease.
This finding was important because treatments for bipolar disorder, particularly some atypical antipsychotics, can increase lipid abnormalities, he said in an interview at his poster at a meeting of the New Clinical Drug Evaluation Unit sponsored by the National Institute of Mental Health.
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Another advantage of targeting bioactive lipids is, unlike protein targets, lipid structures are generally unchanged from one animal species to another.