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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.
References in periodicals archive ?
As sucrose content increasedin the presence of oil, the resulting bulky blend of molecules forming the composite film matrix showed large lipidic inclusions coarsely dispersed.
Regarding the lipidic metabolism in MSG rats, although there are some discrepancies among our data on unmodified peripheral TG concentrations, it must be mentioned that other researchers found enhanced basal TG levels where they have taken those samples at 8 or more hours after food was withdrawn (fasting condition) [40, 41].
In both species investigated there was a disordered deposition of sporopollenin on all available extracellular lipidic surfaces and also on the outside of tapetal plasma membranes.
Novel brominatecl lipidic compounds from lichens of Central Asia.
In addition, CHOL has also been shown to play a central role in the fusion mechanism by virtue of its intrinsic negative curvature; it is a critical component initiating formation of a hemifusion diaphragm (one of the lipidic structural intermediates proposed to enable membrane merger) at inter-membrane docking or contact sites (Chernomordik and Kozlov, 2008).
The analysis of the lipidic pattern showed that diabetic women generally presented higher values of all lipid fractions compared with diabetic men.
2] adrenergic receptors and (2) adoption of the lipidic cubic phase method.
The viral envelope, having a thickness of 6-7 nm, is a lipidic, trilaminar membranous structure with two electron transparent layers divided by an electron opaque layer.
However, the researchers used a high-quality preparation (a proprietary lipidic ethanolic extract) of saw palmetto at higher doses than the STEP trial and came to a similar conclusion, making it highly unlikely that another preparation would perform differently.
For instance, most recently a lipidic metabolite isolated from S.
Users break off the end of each applicator, freeing the product's active ingredients and oils to combat aging and restore the natural lipidic film of the skin.
18) many of the essential oil compounds have the ability to break or to penetrate the lipidic structure present in the outer membrane of Gramnegative bacteria.