Phospholipids are a class of lipids that are a major component of all cell membranes. They can form lipid bilayers because of their amphiphilic characteristic. The structure of the phospholipid molecule generally consists of two hydrophobic fatty acid "tails" and a hydrophilic "head" consisting of a phosphate group. The two components are usually joined together by a glycerol molecule. The phosphate groups can be modified with simple organic molecules such as choline, ethanolamine or serine.
The first phospholipid identified in 1847 as such in biological tissues was lecithin, or phosphatidylcholine, in the egg yolk of chickens by the French chemist and pharmacist Theodore Nicolas Gobley. Biological membranes in eukaryotes also contain another class of lipid, sterol, interspersed among the phospholipids and together they provide membrane fluidity and mechanical strength. Purified phospholipids are produced commercially and have found applications in nanotechnology and materials science.
An amphiphile (from the Greek αμφις, amphis: both and φιλíα, philia: love, friendship; also termed "amphipathic") is a term describing a chemical compound possessing both hydrophilic (water-loving, polar) and lipophilic (fat-loving, non-polar) properties; lipophilic properties can also be considered hydrophobic (water-avoiding). The phospholipid head usually contains a negatively charged phosphate group and glycerol; it is hydrophilic. The phospholipid tails usually consist of 2 long fatty acid chains; they are hydrophobic and avoid interactions with water. When placed in aqueous solutions, phospholipids are driven by hydrophobic interactions that result in the fatty acid tails aggregating to minimize interactions with water molecules. These specific properties allow phospholipids to play an important role in the phospholipid bilayer. In biological systems, the phospholipids often occur with other molecules (e.g., proteins, glycolipids, sterols) in a bilayer such as a cell membrane. Lipid bilayers occur when hydrophobic tails line up against one another, forming a membrane of hydrophilic heads on both sides facing the water.
Such movement can be described by the fluid mosaic model, that describes the membrane as a mosaic of lipid molecules that act as a solvent for all the substances and proteins within it, so proteins and lipid molecules are then free to diffuse laterally through the lipid matrix and migrate over the membrane. Sterols contribute to membrane fluidity by hindering the packing together of phospholipids. However, this model has now been superseded, as through the study of lipid polymorphism it is now known that the behaviour of lipids under physiological (and other) conditions is not simple.
- See: Glycerophospholipid
- Phosphatidic acid (phosphatidate) (PA)
- Phosphatidylethanolamine (cephalin) (PE)
- Phosphatidylcholine (lecithin) (PC)
- Phosphatidylserine (PS)
- Ceramide phosphorylcholine (Sphingomyelin) (SPH)
- Ceramide phosphorylethanolamine (Sphingomyelin) (Cer-PE)
- Ceramide phosphoryllipid
Phospholipids have been widely used to prepare liposomal, ethosomal and other nanoformulations of topical, oral and parenteral drugs for differing reasons like improved bio-availability, reduced toxicity and increased permeability across membranes. Liposomes are often composed of phosphatidylcholine-enriched phospholipids and may also contain mixed phospholipid chains with surfactant properties. The ethosomal formulation of ketoconazole using phospholipids is a promising option for transdermal delivery in fungal infections.
Phospholipids are optically highly birefringent, i.e. their refractive index is different along their axis as opposed to perpendicular to it. Measurement of birefringence can be achieved using cross polarisers in a microscope to obtain an image of e.g. vesicle walls or using techniques such as dual polarisation interferometry to quantify lipid order or disruption in supported bilayers.
There are no simple methods available for analysis of phospholipids since the close range of polarity between different phospholipid species makes detection difficult. Oil chemists often use spectroscopy to determine total Phosphorus abundance and then calculate approximate mass of phospholipids based on molecular weight of expected fatty acid species. Modern lipid profiling employs more absolute methods of analysis, with nuclear magnetic resonance spectroscopy (NMR spectroscopy), particularly 31P-NMR, while HPLC-ELSD provides relative values.
Phospholipid synthesis occurs in the cytosolic side of ER membrane  that is studded with proteins that act in synthesis (GPAT and LPAAT acyl transferases, phosphatase and choline phosphotransferase) and allocation (flippase and floppase). Eventually a vesicle will bud off from the ER containing phospholipids destined for the cytoplasmic cellular membrane on its exterior leaflet and phospholipids destined for the exoplasmic cellular membrane on its inner leaflet.
Common sources of industrially produced phospholipids are soya, rapeseed, sunflower, chicken eggs, bovine milk, fish eggs etc. Each source has a unique profile of individual phospholipid species and consequently differing applications in food, nutrition, pharmaceuticals, cosmetics and drug delivery.
In signal transduction
Some types of phospholipid can be split to produce products that function as second messengers in signal transduction. Examples include phosphatidylinositol (4,5)-bisphosphate (PIP2), that can be split by the enzyme Phospholipase C into inositol triphosphate (IP3) and diacylglycerol (DAG), which both carry out the functions of the Gq type of G protein in response to various stimuli and intervene in various processes from long term depression in neurons to leukocyte signal pathways started by chemokine receptors.
Phospholipids also intervene in prostaglandin signal pathways as the raw material used by lipase enzymes to produce the prostaglandin precursors. In plants they serve as the raw material to produce Jasmonic acid, a plant hormone similar in structure to prostaglandins that mediates defensive responses against pathogens.
Phospholipids can act as emulsifiers, enabling oils to form a colloid with water. Phospholipids are one of the components of lecithin which is found in egg-yolks, as well as being extracted from soybeans, and is used as a food additive in many products, and can be purchased as a dietary supplement. Lysolecithins are typically used for water-oil emulsions like margarine, due to their higher HLB ratio.
- See table below for an extensive list.
- Natural phospholipid derivates:
- Synthetic phospholipid derivates:
- Phosphatidic acid (DMPA, DPPA, DSPA)
- Phosphatidylcholine (DDPC, DLPC, DMPC, DPPC, DSPC, DOPC, POPC, DEPC)
- Phosphatidylglycerol (DMPG, DPPG, DSPG, POPG)
- Phosphatidylethanolamine (DMPE, DPPE, DSPE DOPE)
- Phosphatidylserine (DOPS)
- PEG phospholipid (mPEG-phospholipid, polyglycerin-phospholipid, funcitionalized-phospholipid, terminal activated-phospholipid)
Abbreviations used and chemical information of glycerophospholipids
|DEPA-NA||80724-31-8||1,2-Dierucoyl-sn-glycero-3-phosphate (Sodium Salt)||Phosphatidic acid|
|DEPG-NA||1,2-Dierucoyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Sodium Salt)||Phosphatidylglycerol|
|DLPA-NA||1,2-Dilauroyl-sn-glycero-3-phosphate (Sodium Salt)||Phosphatidic acid|
|DLPG-NA||1,2-Dilauroyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Sodium Salt)||Phosphatidylglycerol|
|DLPG-NH4||1,2-Dilauroyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Ammonium Salt)||Phosphatidylglycerol|
|DLPS-NA||1,2-Dilauroyl-sn-glycero-3-phosphoserine (Sodium Salt)||Phosphatidylserine|
|DMPA-NA||80724-3||1,2-Dimyristoyl-sn-glycero-3-phosphate (Sodium Salt)||Phosphatidic acid|
|DMPG-NA||67232-80-8||1,2-Dimyristoyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Sodium Salt)||Phosphatidylglycerol|
|DMPG-NH4||1,2-Dimyristoyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Ammonium Salt)||Phosphatidylglycerol|
|DMPG-NH4/NA||1,2-Dimyristoyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Sodium/Ammonium Salt)||Phosphatidylglycerol|
|DMPS-NA||1,2-Dimyristoyl-sn-glycero-3-phosphoserine (Sodium Salt)||Phosphatidylserine|
|DOPA-NA||1,2-Dioleoyl-sn-glycero-3-phosphate (Sodium Salt)||Phosphatidic acid|
|DOPG-NA||62700-69-0||1,2-Dioleoyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Sodium Salt)||Phosphatidylglycerol|
|DOPS-NA||70614-14-1||1,2-Dioleoyl-sn-glycero-3-phosphoserine (Sodium Salt)||Phosphatidylserine|
|DPPA-NA||71065-87-7||1,2-Dipalmitoyl-sn-glycero-3-phosphate (Sodium Salt)||Phosphatidic acid|
|DPPG-NA||67232-81-9||1,2-Dipalmitoyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Sodium Salt)||Phosphatidylglycerol|
|DPPG-NH4||73548-70-6||1,2-Dipalmitoyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Ammonium Salt)||Phosphatidylglycerol|
|DPPS-NA||1,2-Dipalmitoyl-sn-glycero-3-phosphoserine (Sodium Salt)||Phosphatidylserine|
|DSPA-NA||108321-18-2||1,2-Distearoyl-sn-glycero-3-phosphate (Sodium Salt)||Phosphatidic acid|
|DSPG-NA||67232-82-0||1,2-Distearoyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Sodium Salt)||Phosphatidylglycerol|
|DSPG-NH4||108347-80-4||1,2-Distearoyl-sn-glycero-3[Phospho-rac-(1-glycerol...) (Ammonium Salt)||Phosphatidylglycerol|
|DSPS-NA||1,2-Distearoyl-sn-glycero-3-phosphoserine (Sodium Salt)||Phosphatidylserine|
|HEPC||Hydrogenated Egg PC||Phosphatidylcholine|
|HSPC||Hydrogenated Soy PC||Phosphatidylcholine|
|Milk Sphingomyelin MPPC||1-Myristoyl-2-palmitoyl-sn-glycero 3-phosphocholine||Phosphatidylcholine|
|POPG-NA||81490-05-3||1-Palmitoyl-2-oleoyl-sn-glycero-3[Phospho-rac-(1-glycerol)...] (Sodium Salt)||Phosphatidylglycerol|
- Mashaghi S.; Jadidi T.; Koenderink G.; Mashaghi A. (2013). "Lipid Nanotechnology". Int. J. Mol. Sci. 14 (2): 4242–4282. doi:10.3390/ijms14024242. PMC 3588097. PMID 23429269.
- Campbell, Neil A.; Brad Williamson; Robin J. Heyden (2006). Biology: Exploring Life. Boston, Massachusetts: Pearson Prentice Hall. ISBN 978-0-13-250882-7.[page needed]
- Ketoconazole Encapsulated Liposome and Ethosome: GUNJAN TIWARI
- N. Culeddu; M. Bosco; R. Toffanin & P. Pollesello (1998). "High resolution 31P NMR of extracted phospholipids". Magnetic Resonance in Chemistry. 36 (12): 907–912. doi:10.1002/(sici)1097-458x(199812)36:12<907::aid-omr394>3.0.co;2-5.
- Furse, Samuel; Liddell, Susan; Ortori, Catharine A.; Williams, Huw; Neylon, D. Cameron; Scott, David J.; Barrett, David A.; Gray, David A. (2013). "The lipidome and proteome of oil bodies from Helianthus annuus (common sunflower)". Journal of Chemical Biology. 6 (2): 63–76. doi:10.1007/s12154-012-0090-1. PMC 3606697. PMID 23532185.
- T.L. Mounts; A.M. Nash (1990). "HPLC analysis of phospholipids in crude oil for evaluation of soybean deterioration". Journal of the American Oil Chemists' Society. 67 (11): 757–760. doi:10.1007/BF02540486.
- Prinz, William A.; Choudhary, Vineet; Liu, Li-Ka; Lahiri, Sujoy; Kannan, Muthukumar (2017-03-01). "Phosphatidylserine synthesis at membrane contact sites promotes its transport out of the ER". Journal of Lipid Research. 58 (3): 553–562. doi:10.1194/jlr.M072959. ISSN 0022-2275. PMC 5335585. PMID 28119445.
- Lodish H, Berk A, et al. (2007). Molecular Cell Biology (6th ed.). W. H. Freeman. ISBN 978-0-7167-7601-7.
- Zheng L, Lin Y, Lu S, Zhang J, Bogdanov M (November 2017). "Biogenesis, transport and remodeling of lysophospholipids in Gram-negative bacteria". Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids. 1862 (11): 1404–1413. doi:10.1016/j.bbalip.2016.11.015. PMC 6162059. PMID 27956138.
- Choi, S.-Y.; Chang, J; Jiang, B; Seol, GH; Min, SS; Han, JS; Shin, HS; Gallagher, M; Kirkwood, A (2005). "Multiple Receptors Coupled to Phospholipase C Gate Long-Term Depression in Visual Cortex". Journal of Neuroscience. 25 (49): 11433–43. doi:10.1523/JNEUROSCI.4084-05.2005. PMC 6725895. PMID 16339037.
- Cronshaw, D. G.; Kouroumalis, A; Parry, R; Webb, A; Brown, Z; Ward, SG (2006). "Evidence that phospholipase C-dependent, calcium-independent mechanisms are required for directional migration of T lymphocytes in response to the CCR4 ligands CCL17 and CCL22". Journal of Leukocyte Biology. 79 (6): 1369–80. doi:10.1189/jlb.0106035. PMID 16614259.