Lipid - wikipedia Lipid A substance of biological origin that is soluble in nonpolar solvents Structures of some common lipids. At the top are cholesterol and oleic acid. The middle structure is a triglyceride composed of oleoyl, stearoyl, and palmitoyl chains attached to a glycerol backbone. At the bottom is the common phospholipid phosphatidylcholine. In biology and biochemistry, a lipid is a biomolecule that is soluble in nonpolar solvents. Non-polar solvents are typically hydrocarbons used to dissolve other naturally occurring hydrocarbon lipid molecules that do not ( or do not easily ) dissolve in water, including fatty acids, waxes, sterols, fat - soluble vitamins ( such as vitamins A, D, E, and K ), monoglycerides, diglycerides, triglycerides, and phospholipids. The functions of lipids include storing energy, signaling, and acting as structural components of cell membranes. Lipids have applications in the cosmetic and food industries as well as in nanotechnology. Scientists sometimes broadly define lipids as hydrophobic or amphiphilic small molecules ; the amphiphilic nature of some lipids allows them to form structures such as vesicles, multilamellar / unilamellar liposomes, or membranes in an aqueous environment. Biological lipids originate entirely or in part from two distinct types of biochemical subunits or `` building - blocks '' : ketoacyl and isoprene groups. Using this approach, lipids may be divided into eight categories : fatty acids, glycerolipids, glycerophospholipids, sphingolipids, saccharolipids, and polyketides ( derived from condensation of ketoacyl subunits ) ; and sterol lipids and prenol lipids ( derived from condensation of isoprene subunits ). Although the term `` lipid '' is sometimes used as a synonym for fats, fats are a subgroup of lipids called triglycerides. Lipids also encompass molecules such as fatty acids and their derivatives ( including tri -, di -, monoglycerides, and phospholipids ), as well as other sterol - containing metabolites such as cholesterol. Although humans and other mammals use various biosynthetic pathways both to break down and to synthesize lipids, some essential lipids ca n't be made this way and must be obtained from the diet. Contents 1 History 2 Categories of Lipids 2.1 Fatty acids 2.2 Glycerolipids 2.3 Glycerophospholipids 2.4 Sphingolipids 2.5 Sterol lipids 2.6 Prenol lipids 2.7 Saccharolipids 2.8 Polyketides 3 Biological functions 3.1 Membranes 3.2 Energy storage 3.3 Signaling 3.4 Other functions 4 Metabolism 4.1 Biosynthesis 4.2 Degradation 5 Nutrition and health 6 See also 7 References 7.1 Bibliography 8 External links History In 1815, Henry Braconnot classified lipids ( graisses ) in two categories, suifs ( solid greases or tallow ) and huiles ( fluid oils ). In 1823, Michel Eugène Chevreul developed a more detailed classification, including oils, greases, tallow, waxes, resins, balsams and volatile oils ( or essential oils ). In 1827, William Prout recognized fat ( `` oily '' alimentary matters ), along with protein ( `` albuminous '' ) and carbohydrate ( `` saccharine '' ), as an important nutrient for humans and animals. For a century, chemists regarded `` fats '' as only simple lipids made of fatty acids and glycerol ( glycerides ), but new forms were described later. Theodore Gobley ( 1847 ) discovered phospholipids in mammalian brain and hen egg, called by him as `` lecithins ''. Thudichum discovered in human brain some phospholipids ( cephalin ), glycolipids ( cerebroside ) and sphingolipids ( sphingomyelin ). The terms lipoid, lipin, lipide and lipid have been used with varied meanings from author to author. In 1912, Rosenbloom and Gies proposed the substitution of `` lipoid '' by `` lipin ''. In 1920, Bloor introduced a new classification for `` lipoids '' : simple lipoids ( greases and waxes ), compound lipoids ( phospholipoids and glycolipoids ), and the derived lipoids ( fatty acids, alcohols, sterols ). The word `` lipid '', which stems etymologically from the Greek lipos ( fat ), was introduced in 1923 by Gabriel Bertrand. Bertrands included in the concept not only the traditional fats ( glycerides ), but also the `` lipoids '', with a complex constitution. In 1947, T.P. Hilditch divided lipids into `` simple lipids '', with greases and waxes ( true waxes, sterols, alcohols ), and `` complex lipids '', with phospholipids and glycolipids. Categories of lipids Fatty acids I - Prostacyclin ( an example of a prostaglandin, an eicosanoid fatty acid ) LTB ( an example of a leukotriene, an eicosanoid fatty acid ) Fatty acids, or fatty acid residues when they are part of a lipid, are a diverse group of molecules synthesized by chain - elongation of an acetyl - CoA primer with malonyl - CoA or methylmalonyl - CoA groups in a process called fatty acid synthesis. They are made of a hydrocarbon chain that terminates with a carboxylic acid group ; this arrangement confers the molecule with a polar, hydrophilic end, and a nonpolar, hydrophobic end that is insoluble in water. The fatty acid structure is one of the most fundamental categories of biological lipids, and is commonly used as a building - block of more structurally complex lipids. The carbon chain, typically between four and 24 carbons long, may be saturated or unsaturated, and may be attached to functional groups containing oxygen, halogens, nitrogen, and sulfur. If a fatty acid contains a double bond, there is the possibility of either a cis or trans geometric isomerism, which significantly affects the molecule 's configuration. Cis - double bonds cause the fatty acid chain to bend, an effect that is compounded with more double bonds in the chain. Three double bonds in 18 - carbon linolenic acid, the most abundant fatty - acyl chains of plant thylakoid membranes, render these membranes highly fluid despite environmental low - temperatures, and also makes linolenic acid give dominating sharp peaks in high resolution 13 - C NMR spectra of chloroplasts. This in turn plays an important role in the structure and function of cell membranes. Most naturally occurring fatty acids are of the cis configuration, although the trans form does exist in some natural and partially hydrogenated fats and oils. Examples of biologically important fatty acids include the eicosanoids, derived primarily from arachidonic acid and eicosapentaenoic acid, that include prostaglandins, leukotrienes, and thromboxanes. Docosahexaenoic acid is also important in biological systems, particularly with respect to sight. Other major lipid classes in the fatty acid category are the fatty esters and fatty amides. Fatty esters include important biochemical intermediates such as wax esters, fatty acid thioester coenzyme A derivatives, fatty acid thioester ACP derivatives and fatty acid carnitines. The fatty amides include N - acyl ethanolamines, such as the cannabinoid neurotransmitter anandamide. Glycerolipids Example of an unsaturated fat triglyceride ( C H O ). Left part : glycerol ; right part, from top to bottom : palmitic acid, oleic acid, alpha - linolenic acid. Glycerolipids are composed of mono -, di -, and tri-substituted glycerols, the best - known being the fatty acid triesters of glycerol, called triglycerides. The word `` triacylglycerol '' is sometimes used synonymously with `` triglyceride ''. In these compounds, the three hydroxyl groups of glycerol are each esterified, typically by different fatty acids. Because they function as an energy store, these lipids comprise the bulk of storage fat in animal tissues. The hydrolysis of the ester bonds of triglycerides and the release of glycerol and fatty acids from adipose tissue are the initial steps in metabolizing fat. Additional subclasses of glycerolipids are represented by glycosylglycerols, which are characterized by the presence of one or more sugar residues attached to glycerol via a glycosidic linkage. Examples of structures in this category are the digalactosyldiacylglycerols found in plant membranes and seminolipid from mammalian sperm cells. Glycerophospholipids Phosphatidylethanolamine Glycerophospholipids, usually referred to as phospholipids ( though sphingomyelins are also classified as phospholipids ), are ubiquitous in nature and are key components of the lipid bilayer of cells, as well as being involved in metabolism and cell signaling. Neural tissue ( including the brain ) contains relatively high amounts of glycerophospholipids, and alterations in their composition has been implicated in various neurological disorders. Glycerophospholipids may be subdivided into distinct classes, based on the nature of the polar headgroup at the sn - 3 position of the glycerol backbone in eukaryotes and eubacteria, or the sn - 1 position in the case of archaebacteria. Examples of glycerophospholipids found in biological membranes are phosphatidylcholine ( also known as PC, GPCho or lecithin ), phosphatidylethanolamine ( PE or GPEtn ) and phosphatidylserine ( PS or GPSer ). In addition to serving as a primary component of cellular membranes and binding sites for intra - and intercellular proteins, some glycerophospholipids in eukaryotic cells, such as phosphatidylinositols and phosphatidic acids are either precursors of or, themselves, membrane - derived second messengers. Typically, one or both of these hydroxyl groups are acylated with long - chain fatty acids, but there are also alkyl - linked and 1Z - alkenyl - linked ( plasmalogen ) glycerophospholipids, as well as dialkylether variants in archaebacteria. Sphingolipids Sphingomyelin Sphingolipids are a complicated family of compounds that share a common structural feature, a sphingoid base backbone that is synthesized de novo from the amino acid serine and a long - chain fatty acyl CoA, then converted into ceramides, phosphosphingolipids, glycosphingolipids and other compounds. The major sphingoid base of mammals is commonly referred to as sphingosine. Ceramides ( N - acyl - sphingoid bases ) are a major subclass of sphingoid base derivatives with an amide - linked fatty acid. The fatty acids are typically saturated or mono - unsaturated with chain lengths from 16 to 26 carbon atoms. The major phosphosphingolipids of mammals are sphingomyelins ( ceramide phosphocholines ), whereas insects contain mainly ceramide phosphoethanolamines and fungi have phytoceramide phosphoinositols and mannose - containing headgroups. The glycosphingolipids are a diverse family of molecules composed of one or more sugar residues linked via a glycosidic bond to the sphingoid base. Examples of these are the simple and complex glycosphingolipids such as cerebrosides and gangliosides. Sterol lipids Sterol lipids, such as cholesterol and its derivatives, are an important component of membrane lipids, along with the glycerophospholipids and sphingomyelins. The steroids, all derived from the same fused four - ring core structure, have different biological roles as hormones and signaling molecules. The eighteen - carbon ( C18 ) steroids include the estrogen family whereas the C19 steroids comprise the androgens such as testosterone and androsterone. The C21 subclass includes the progestogens as well as the glucocorticoids and mineralocorticoids. The secosteroids, comprising various forms of vitamin D, are characterized by cleavage of the B ring of the core structure. Other examples of sterols are the bile acids and their conjugates, which in mammals are oxidized derivatives of cholesterol and are synthesized in the liver. The plant equivalents are the phytosterols, such as β - sitosterol, stigmasterol, and brassicasterol ; the latter compound is also used as a biomarker for algal growth. The predominant sterol in fungal cell membranes is ergosterol. Prenol lipids Prenol lipid ( 2E - geraniol ) Prenol lipids are synthesized from the five - carbon - unit precursors isopentenyl diphosphate and dimethylallyl diphosphate that are produced mainly via the mevalonic acid ( MVA ) pathway. The simple isoprenoids ( linear alcohols, diphosphates, etc. ) are formed by the successive addition of C5 units, and are classified according to number of these terpene units. Structures containing greater than 40 carbons are known as polyterpenes. Carotenoids are important simple isoprenoids that function as antioxidants and as precursors of vitamin A. Another biologically important class of molecules is exemplified by the quinones and hydroquinones, which contain an isoprenoid tail attached to a quinonoid core of non-isoprenoid origin. Vitamin E and vitamin K, as well as the ubiquinones, are examples of this class. Prokaryotes synthesize polyprenols ( called bactoprenols ) in which the terminal isoprenoid unit attached to oxygen remains unsaturated, whereas in animal polyprenols ( dolichols ) the terminal isoprenoid is reduced. Saccharolipids Structure of the saccharolipid Kdo - lipid A. Glucosamine residues in blue, Kdo residues in red, acyl chains in black and phosphate groups in green. Saccharolipids describe compounds in which fatty acids are linked directly to a sugar backbone, forming structures that are compatible with membrane bilayers. In the saccharolipids, a monosaccharide substitutes for the glycerol backbone present in glycerolipids and glycerophospholipids. The most familiar saccharolipids are the acylated glucosamine precursors of the Lipid A component of the lipopolysaccharides in Gram - negative bacteria. Typical lipid A molecules are disaccharides of glucosamine, which are derivatized with as many as seven fatty - acyl chains. The minimal lipopolysaccharide required for growth in E. coli is Kdo - Lipid A, a hexa - acylated disaccharide of glucosamine that is glycosylated with two 3 - deoxy - D - manno - octulosonic acid ( Kdo ) residues. Polyketides Polyketides are synthesized by polymerization of acetyl and propionyl subunits by classic enzymes as well as iterative and multimodular enzymes that share mechanistic features with the fatty acid synthases. They comprise a large number of secondary metabolites and natural products from animal, plant, bacterial, fungal and marine sources, and have great structural diversity. Many polyketides are cyclic molecules whose backbones are often further modified by glycosylation, methylation, hydroxylation, oxidation, or other processes. Many commonly used anti-microbial, anti-parasitic, and anti-cancer agents are polyketides or polyketide derivatives, such as erythromycins, tetracyclines, avermectins, and antitumor epothilones. Biological functions Membranes Eukaryotic cells feature compartmentalized membrane - bound organelles that carry out different biological functions. The glycerophospholipids are the main structural component of biological membranes, such as the cellular plasma membrane and the intracellular membranes of organelles ; in animal cells, the plasma membrane physically separates the intracellular components from the extracellular environment. The glycerophospholipids are amphipathic molecules ( containing both hydrophobic and hydrophilic regions ) that contain a glycerol core linked to two fatty acid - derived `` tails '' by ester linkages and to one `` head '' group by a phosphate ester linkage. While glycerophospholipids are the major component of biological membranes, other non-glyceride lipid components such as sphingomyelin and sterols ( mainly cholesterol in animal cell membranes ) are also found in biological membranes. In plants and algae, the galactosyldiacylglycerols, and sulfoquinovosyldiacylglycerol, which lack a phosphate group, are important components of membranes of chloroplasts and related organelles and are the most abundant lipids in photosynthetic tissues, including those of higher plants, algae and certain bacteria. Plant thylakoid membranes have the largest lipid component of a non-bilayer forming monogalactosyl diglyceride ( MGDG ), and little phospholipids ; despite this unique lipid composition, chloroplast thylakoid membranes have been shown to contain a dynamic lipid - bilayer matrix as revealed by magnetic resonance and electron microscope studies. Self - organization of phospholipids : a spherical liposome, a micelle, and a lipid bilayer. A biological membrane is a form of lamellar phase lipid bilayer. The formation of lipid bilayers is an energetically preferred process when the glycerophospholipids described above are in an aqueous environment. This is known as the hydrophobic effect. In an aqueous system, the polar heads of lipids align towards the polar, aqueous environment, while the hydrophobic tails minimize their contact with water and tend to cluster together, forming a vesicle ; depending on the concentration of the lipid, this biophysical interaction may result in the formation of micelles, liposomes, or lipid bilayers. Other aggregations are also observed and form part of the polymorphism of amphiphile ( lipid ) behavior. Phase behavior is an area of study within biophysics and is the subject of current academic research. Micelles and bilayers form in the polar medium by a process known as the hydrophobic effect. When dissolving a lipophilic or amphiphilic substance in a polar environment, the polar molecules ( i.e., water in an aqueous solution ) become more ordered around the dissolved lipophilic substance, since the polar molecules can not form hydrogen bonds to the lipophilic areas of the amphiphile. So in an aqueous environment, the water molecules form an ordered `` clathrate '' cage around the dissolved lipophilic molecule. The formation of lipids into protocell membranes represents a key step in models of abiogenesis, the origin of life. Energy storage Triglycerides, stored in adipose tissue, are a major form of energy storage both in animals and plants. They are a major source of energy because carbohydrates are fully reduced structures. In comparison to glycogen which would contribute only half of the energy per its pure mass, carbohydrate carbons are all bounded to hydrogens unlike in carbohydrates. The adipocyte, or fat cell, is designed for continuous synthesis and breakdown of triglycerides in animals, with breakdown controlled mainly by the activation of hormone - sensitive enzyme lipase. The complete oxidation of fatty acids provides high caloric content, about 38 kJ / g ( 9 kcal / g ), compared with 17 kJ / g ( 4 kcal / g ) for the breakdown of carbohydrates and proteins. Migratory birds that must fly long distances without eating use stored energy of triglycerides to fuel their flights. Signaling In recent years, evidence has emerged showing that lipid signaling is a vital part of the cell signaling. Lipid signaling may occur via activation of G protein - coupled or nuclear receptors, and members of several different lipid categories have been identified as signaling molecules and cellular messengers. These include sphingosine - 1 - phosphate, a sphingolipid derived from ceramide that is a potent messenger molecule involved in regulating calcium mobilization, cell growth, and apoptosis ; diacylglycerol ( DAG ) and the phosphatidylinositol phosphates ( PIPs ), involved in calcium - mediated activation of protein kinase C ; the prostaglandins, which are one type of fatty - acid derived eicosanoid involved in inflammation and immunity ; the steroid hormones such as estrogen, testosterone and cortisol, which modulate a host of functions such as reproduction, metabolism and blood pressure ; and the oxysterols such as 25 - hydroxy - cholesterol that are liver X receptor agonists. Phosphatidylserine lipids are known to be involved in signaling for the phagocytosis of apoptotic cells or pieces of cells. They accomplish this by being exposed to the extracellular face of the cell membrane after the inactivation of flippases which place them exclusively on the cytosolic side and the activation of scramblases, which scramble the orientation of the phospholipids. After this occurs, other cells recognize the phosphatidylserines and phagocytosize the cells or cell fragments exposing them. Other functions The `` fat - soluble '' vitamins ( A, D, E and K ) -- which are isoprene - based lipids -- are essential nutrients stored in the liver and fatty tissues, with a diverse range of functions. Acyl - carnitines are involved in the transport and metabolism of fatty acids in and out of mitochondria, where they undergo beta oxidation. Polyprenols and their phosphorylated derivatives also play important transport roles, in this case the transport of oligosaccharides across membranes. Polyprenol phosphate sugars and polyprenol diphosphate sugars function in extra-cytoplasmic glycosylation reactions, in extracellular polysaccharide biosynthesis ( for instance, peptidoglycan polymerization in bacteria ), and in eukaryotic protein N - glycosylation. Cardiolipins are a subclass of glycerophospholipids containing four acyl chains and three glycerol groups that are particularly abundant in the inner mitochondrial membrane. They are believed to activate enzymes involved with oxidative phosphorylation. Lipids also form the basis of steroid hormones. Metabolism The major dietary lipids for humans and other animals are animal and plant triglycerides, sterols, and membrane phospholipids. The process of lipid metabolism synthesizes and degrades the lipid stores and produces the structural and functional lipids characteristic of individual tissues. Biosynthesis In animals, when there is an oversupply of dietary carbohydrate, the excess carbohydrate is converted to triglycerides. This involves the synthesis of fatty acids from acetyl - CoA and the esterification of fatty acids in the production of triglycerides, a process called lipogenesis. Fatty acids are made by fatty acid synthases that polymerize and then reduce acetyl - CoA units. The acyl chains in the fatty acids are extended by a cycle of reactions that add the acetyl group, reduce it to an alcohol, dehydrate it to an alkene group and then reduce it again to an alkane group. The enzymes of fatty acid biosynthesis are divided into two groups, in animals and fungi all these fatty acid synthase reactions are carried out by a single multifunctional protein, while in plant plastids and bacteria separate enzymes perform each step in the pathway. The fatty acids may be subsequently converted to triglycerides that are packaged in lipoproteins and secreted from the liver. The synthesis of unsaturated fatty acids involves a desaturation reaction, whereby a double bond is introduced into the fatty acyl chain. For example, in humans, the desaturation of stearic acid by stearoyl - CoA desaturase - 1 produces oleic acid. The doubly unsaturated fatty acid linoleic acid as well as the triply unsaturated α - linolenic acid can not be synthesized in mammalian tissues, and are therefore essential fatty acids and must be obtained from the diet. Triglyceride synthesis takes place in the endoplasmic reticulum by metabolic pathways in which acyl groups in fatty acyl - CoAs are transferred to the hydroxyl groups of glycerol - 3 - phosphate and diacylglycerol. Terpenes and isoprenoids, including the carotenoids, are made by the assembly and modification of isoprene units donated from the reactive precursors isopentenyl pyrophosphate and dimethylallyl pyrophosphate. These precursors can be made in different ways. In animals and archaea, the mevalonate pathway produces these compounds from acetyl - CoA, while in plants and bacteria the non-mevalonate pathway uses pyruvate and glyceraldehyde 3 - phosphate as substrates. One important reaction that uses these activated isoprene donors is steroid biosynthesis. Here, the isoprene units are joined together to make squalene and then folded up and formed into a set of rings to make lanosterol. Lanosterol can then be converted into other steroids such as cholesterol and ergosterol. Degradation Beta oxidation is the metabolic process by which fatty acids are broken down in the mitochondria or in peroxisomes to generate acetyl - CoA. For the most part, fatty acids are oxidized by a mechanism that is similar to, but not identical with, a reversal of the process of fatty acid synthesis. That is, two - carbon fragments are removed sequentially from the carboxyl end of the acid after steps of dehydrogenation, hydration, and oxidation to form a beta - keto acid, which is split by thiolysis. The acetyl - CoA is then ultimately converted into ATP, CO, and H O using the citric acid cycle and the electron transport chain. Hence the citric acid cycle can start at acetyl - CoA when fat is being broken down for energy if there is little or no glucose available. The energy yield of the complete oxidation of the fatty acid palmitate is 106 ATP. Unsaturated and odd - chain fatty acids require additional enzymatic steps for degradation. Nutrition and Health Most of the fat found in food is in the form of triglycerides, cholesterol, and phospholipids. Some dietary fat is necessary to facilitate absorption of fat - soluble vitamins ( A, D, E, and K ) and carotenoids. Humans and other mammals have a dietary requirement for certain essential fatty acids, such as linoleic acid ( an omega - 6 fatty acid ) and alpha - linolenic acid ( an omega - 3 fatty acid ) because they can not be synthesized from simple precursors in the diet. Both of these fatty acids are 18 - carbon polyunsaturated fatty acids differing in the number and position of the double bonds. Most vegetable oils are rich in linoleic acid ( safflower, sunflower, and corn oils ). Alpha - linolenic acid is found in the green leaves of plants, and in selected seeds, nuts, and legumes ( in particular flax, rapeseed, walnut, and soy ). Fish oils are particularly rich in the longer - chain omega - 3 fatty acids eicosapentaenoic acid ( EPA ) and docosahexaenoic acid ( DHA ). A large number of studies have shown positive health benefits associated with consumption of omega - 3 fatty acids on infant development, cancer, cardiovascular diseases, and various mental illnesses, such as depression, attention - deficit hyperactivity disorder, and dementia. In contrast, it is now well - established that consumption of trans fats, such as those present in partially hydrogenated vegetable oils, are a risk factor for cardiovascular disease. Fats that are good for you can be turned into trans fats by overcooking. A few studies have suggested that total dietary fat intake is linked to an increased risk of obesity and diabetes. However, a number of very large studies, including the Women 's Health Initiative Dietary Modification Trial, an eight - year study of 49,000 women, the Nurses ' Health Study and the Health Professionals Follow - up Study, revealed no such links. 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ISBN 978 - 0 - 7167 - 8724 - 2. van Holde KE, Mathews CK ( 1996 ). Biochemistry ( 2nd ed. ). Menlo Park, California : Benjamin / Cummings Pub. Co. ISBN 978 - 0 - 8053 - 3931 - 4. External links Look up lipid in Wiktionary, the free dictionary. Wikimedia Commons has media related to Lipids. Introductory List of lipid - related web sites Nature Lipidomics Gateway -- Round - up and summaries of recent lipid research Lipid Library -- General reference on lipid chemistry and biochemistry Cyberlipid.org -- Resources and history for lipids. Molecular Computer Simulations -- Modeling of Lipid Membranes Lipids, Membranes and Vesicle Trafficking -- The Virtual Library of Biochemistry, Molecular Biology and Cell Biology Nomenclature IUPAC nomenclature of lipids IUPAC glossary entry for the lipid class of molecules Databases LIPID MAPS -- Comprehensive lipid and lipid - associated gene / protein databases. LipidBank -- Japanese database of lipids and related properties, spectral data and references. General ApolloLipids -- Provides dyslipidemia and cardiovascular disease prevention and treatment information as well as continuing medical education programs National Lipid Association -- Professional medical education organization for health care professionals who seek to prevent morbidity and mortality stemming from dyslipidemias and other cholesterol - related disorders. Types of lipids General Saturation : Saturated fat Unsaturated fat Monounsaturated fat Polyunsaturated fat Essential fatty acid Other : Fat Oil Geometry Trans fat Omega - 3 fatty acid Omega - 6 fatty acid Omega - 9 fatty acid Eicosanoids Arachidonic acid Prostaglandins Prostacyclin Thromboxane Leukotrienes Fatty acids Caprylic acid Capric acid Lauric acid Myristic acid Palmitic acid Stearic acid Arachidic acid Behenic acid Lignoceric acid Glycerides Monoglyceride Diglyceride Triglyceride Triheptanoin Trimyristin Tripalmitin Tristearin Trilinolein Triolein Phospholipids Phosphatidylserine Phosphatidylinositol Phosphatidyl ethanolamine Cardiolipin Dipalmitoylphosphatidylcholine Sphingolipids Ceramide Steroids Cholesterol Corticosteroids Sex steroids Secosteroids Lipids : fatty acids Saturated Acetic ( C2 ) Propionic ( C3 ) Butyric ( C4 ) Valeric ( C5 ) Caproic ( C6 ) Enanthic ( C7 ) Caprylic ( C8 ) Pelargonic ( C9 ) Capric ( C10 ) Undecylic ( C11 ) Lauric ( C12 ) Tridecylic ( C13 ) Myristic ( C14 ) Pentadecanoic ( C15 ) Palmitic ( C16 ) Margaric ( C17 ) Stearic ( C18 ) Nonadecylic ( C19 ) Arachidic ( C20 ) Heneicosylic ( C21 ) Behenic ( C22 ) Tricosylic ( C23 ) Lignoceric ( C24 ) Pentacosylic ( C25 ) Cerotic ( C26 ) Heptacosylic ( C27 ) Montanic ( C28 ) Nonacosylic ( C29 ) Melissic ( C30 ) Hentriacontylic ( C31 ) Lacceroic ( C32 ) Psyllic ( C33 ) Geddic ( C34 ) Ceroplastic ( C35 ) Hexatriacontylic ( C36 ) Heptatriacontanoic ( C37 ) Octatriacontanoic ( C38 ) Nonatriacontanoic ( C39 ) Tetracontanoic ( C40 ) ω − 3 Unsaturated Octenoic ( 8 : 1 ) Decenoic ( 10 : 1 ) Decadienoic ( 10 : 2 ) Lauroleic ( 12 : 1 ) Laurolinoleic ( 12 : 2 ) Myristovaccenic ( 14 : 1 ) Myristolinoleic ( 14 : 2 ) Myristolinolenic ( 14 : 3 ) Palmitolinolenic ( 16 : 3 ) Palmitidonic ( 16 : 4 ) α - Linolenic ( 18 : 3 ) Stearidonic ( 18 : 4 ) Dihomo - α - linolenic ( 20 : 3 ) Eicosatetraeonic ( 20 : 4 ) Eicosapentaenoic ( 20 : 5 ) Clupanodonic ( 22 : 5 ) Docosahexaenoic ( 22 : 6 ) 9, 12, 15, 18, 21 - Tetracosapentaenoic ( 24 : 5 ) 6, 9, 12, 15, 18, 21 - Tetracosahexaenoic ( 24 : 6 ) ω − 5 Unsaturated Myristoleic ( 14 : 1 ) Palmitovaccenic ( 16 : 1 ) α - Eleostearic ( 18 : 3 ) β - Eleostearic ( trans - 18 : 3 ) Punicic ( 18 : 3 ) 7, 10, 13 - Octadecatrienoic ( 18 : 3 ) 9, 12, 15 - Eicosatrienoic ( 20 : 3 ) β - Eicosatetraenoic ( 20 : 4 ) ω − 6 Unsaturated 8 - Tetradecenoic ( 14 : 1 ) 12 - Octadecenoic ( 18 : 1 ) Linoleic ( 18 : 2 ) Linolelaidic ( trans - 18 : 2 ) γ - Linolenic ( 18 : 3 ) Calendic ( 18 : 3 ) Pinolenic ( 18 : 3 ) Dihomo - linoleic ( 20 : 2 ) Dihomo - γ - linolenic ( 20 : 3 ) Arachidonic ( 20 : 4 ) Adrenic ( 22 : 4 ) Osbond ( 22 : 5 ) ω − 7 Unsaturated Palmitoleic ( 16 : 1 ) Vaccenic ( 18 : 1 ) Rumenic ( 18 : 2 ) Paullinic ( 20 : 1 ) 7, 10, 13 - Eicosatrienoic ( 20 : 3 ) ω − 9 Unsaturated Oleic ( 18 : 1 ) Elaidic ( trans - 18 : 1 ) Gondoic ( 20 : 1 ) Erucic ( 22 : 1 ) Nervonic ( 24 : 1 ) 8, 11 - Eicosadienoic ( 20 : 2 ) Mead ( 20 : 3 ) ω − 10 Unsaturated Sapienic ( 16 : 1 ) ω − 11 Unsaturated Gadoleic ( 20 : 1 ) ω − 12 Unsaturated 4 - Hexadecenoic ( 16 : 1 ) Petroselinic ( 18 : 1 ) 8 - Eicosenoic ( 20 : 1 ) Lipids : lipoprotein particle metabolism Lipoprotein particle classes and subclasses delivery of TGs : Chylomicron VLDL delivery of C and CE : IDL LDL lb LDL sd LDL Lp ( a ) HDL Remnant cholesterol Apolipoproteins APOA 5 APOB APOC APOD APOE APOH SAA SAA1 Extracellular enzymes LCAT LIPC LPL Lipid transfer proteins CETP MTTP PLTP Cell surface receptors HDL : SCARB1 IDL : LRP LRP1 LRP1B LRP2 LRP3 LRP4 LRP5 LRP5L LRP6 LRP8 LRP10 LRP11 LRP12 LDL : LDLR LRPAP1 ATP - binding cassette transporter ABCA1 ABCG5 ABCG8 Lipids : phospholipids Glycerol backbone ( Glycerophospholipids / Phosphoglycerides ) Phosphatidyl - : - ethanolamine / cephalin ( PE ) - choline / lecithin ( PC ) - serine ( PS ) - glycerol ( PG ) - inositol ( PI ) glyco - ( GPI ) Phosphoinositides : PIP PI ( 3 ) P PI ( 4 ) P PI ( 5 ) P PIP PI ( 3, 4 ) P PI ( 3, 5 ) P PI ( 4, 5 ) P PIP Ether lipids : Plasmalogen Platelet - activating factor Cardiolipin Sphingosine backbone Sphingomyelin Metabolites Inositol phosphate Inositol Lysophosphatidic acid Choline Phosphocholine Citicoline Glycoconjugates, lipids and glycolipids : sphingolipids and glycosphingolipids, and metabolic intermediates Ceramide Cerebroside Galactocerebroside Glucocerebroside Lactosylceramide Ganglioside pathway From ganglioside GM1 GM2 GM3 GD2 From globoside Globotriaosylceramide From sphingomyelin Glucocerebroside From sulfatide Galactocerebroside To sphingosine Ceramide Other Sphingosine - 1 - phosphate Metabolism, catabolism, anabolism General Metabolic pathway Metabolic network Primary nutritional groups Energy metabolism Aerobic respiration Glycolysis → Pyruvate decarboxylation → Citric acid cycle → Oxidative phosphorylation ( electron transport chain + ATP synthase ) Anaerobic respiration Electron acceptors are other than oxygen Fermentation Glycolysis → Substrate - level phosphorylation ABE Ethanol Lactic acid Specific paths Protein metabolism Protein synthesis Catabolism Carbohydrate metabolism ( carbohydrate catabolism and anabolism ) Human Glycolysis ⇄ Gluconeogenesis Glycogenolysis ⇄ Glycogenesis Pentose phosphate pathway Fructolysis Galactolysis Glycosylation N - linked O - linked Nonhuman Photosynthesis Anoxygenic photosynthesis Chemosynthesis Carbon fixation Xylose metabolism Radiotrophism Lipid metabolism ( lipolysis, lipogenesis ) Fatty acid metabolism Fatty acid degradation ( Beta oxidation ) Fatty acid synthesis Other Steroid metabolism Sphingolipid metabolism Eicosanoid metabolism Ketosis Reverse cholesterol transport Amino acid Amino acid synthesis Urea cycle Nucleotide metabolism Purine metabolism Nucleotide salvage Pyrimidine metabolism Other Metal metabolism Iron metabolism Ethanol metabolism Food chemistry Additives Carbohydrates Coloring Enzymes Essential fatty acids Flavors Fortification Lipids `` Minerals '' ( Chemical elements ) Proteins Vitamins Water Science of underwater diving Diving physics Ambient pressure Amontons ' law Archimedes ' principle Atmospheric pressure Boyle 's law Breathing performance of regulators Buoyancy Charles 's law Combined gas law Dalton 's law Diffusion Force Gay - Lussac 's law Henry 's law Hydrophobe Hydrostatic pressure Ideal gas law Metre sea water Molecular diffusion Neutral buoyancy Oxygen fraction Partial pressure Permeation Pressure Psychrometric constant Saturation Snell 's law Solubility Solution Supersaturation Surface tension Surfactant Torricellian chamber Underwater vision Weight Diving physiology Artificial gills ( human ) Blood -- air barrier Blood shift Breathing Circulatory system CO2 retention Cold shock response Dead space ( physiology ) Decompression ( diving ) Decompression theory Diving reflex Equivalent narcotic depth Gas exchange Hypocapnia Lipid Maximum operating depth Metabolism Normocapnia Oxygen window in diving decompression Patent foramen ovale Perfusion Physiological response to water immersion Physiology of decompression Pulmonary circulation Respiration ( physiology ) Respiratory exchange ratio Respiratory quotient Respiratory system Systemic circulation Tissue ( biology ) Underwater vision Work of breathing Diving environment Diving environment classification Altitude diving Benign water diving Cave diving Confined water diving Deep diving Ice diving Muck diving Night diving Open water diving Penetration diving Recreational dive sites Wreck diving Oceanographic factors Algal bloom Breaking wave Ocean current Current ( stream ) Ekman transport Halocline List of diving hazards and precautions Longshore drift Rip current Stratification Surf Surge ( wave action ) Thermocline Tidal race Tides Turbidity Undertow ( water waves ) Upwelling Categories : Underwater diving physiology Underwater diving physics Physical oceanography Commons Glossary Indexes : dive sites divers diving Outline Portal Food portal Biology portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=Lipid&oldid=866468376 '' Categories : Lipids Underwater diving physiology Hidden categories : Webarchive template wayback links Wikipedia indefinitely move - 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Question: cholesterol is an example of what type of lipid
Answer: sterol-containing metabolites