Everything below concerns stoichiometry. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-10-27. Numbers and descriptions here follow the published literature rather than marketing material.
The sequence now called GHK was first reported in the early 1970s after isolation from human plasma, where it was noted to influence liver cell behavior in laboratory preparations. Later work described a copper-binding form and its activity in fibroblast and wound-model experiments. Review articles frequently group the substance with other copper peptides. Concentrations in blood appear to fall with age in several small surveys, although the reason for this trend is not settled. Whether such a decline carries functional consequences remains an open question.
Published work on GHK-Cu concentrates largely on cell culture systems rather than whole organisms. Frequently used endpoints include collagen synthesis, expression of matrix metalloproteinases, and migration of fibroblasts. Some reports describe antioxidant behavior, while others stress delivery of copper into cells. These mechanisms are proposed rather than demonstrated, and the relative weight of each pathway is unclear. Human trials are few and generally small, so laboratory findings should not be read as confirmed clinical results.
The compound was first isolated from human plasma in the 1970s by Loren Pickart, who later described copper-binding activity in liver and other tissues. Early reports focused on its presence in blood and its ability to carry copper between proteins. Commercial and cosmetic use of the term 'copper peptide' has since broadened, and labels rarely distinguish GHK-Cu from other copper-binding fragments. This naming overlap makes literature searching harder, because cosmetic ingredient lists, supplier catalogues and laboratory papers use different vocabularies for the same molecule.
GHK-Cu is the copper-binding complex formed by the tripeptide glycyl-L-histidyl-L-lysine and a copper(II) ion. The free peptide is usually written as GHK, and the complex is written as GHK-Cu or Cu-GHK. The sequence was identified in human plasma and later detected in saliva and urine. Its name comes from the single-letter codes of glycine, histidine and lysine. The complex is widely described as a naturally occurring carrier of copper in blood rather than as a free peptide with its own hormonal role.
Copper binds to the peptide through the histidine imidazole nitrogen and the terminal amino group, forming a stable square-planar complex. Binding constants reported for copper(II) with GHK are high, so the peptide competes effectively for copper in solution. The complex absorbs visible light, which gives solutions a blue to violet colour. Whether the metal-free peptide has a distinct biological function of its own is still an open question; some work treats it mainly as a copper delivery vehicle, while other work reports peptide-specific effects.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Copper(II) peptide complex | Peptide chain coordinated to a single metal ion |
| CAS number | 89030-95-5 | Indexed for the peptide-copper complex |
| Molecular formula | C14H22CuN6O4 | Approximate formula for a one-to-one complex |
| Appearance | Blue to violet solid | Color from copper d-d transitions |
| Solubility class | Freely soluble in water | Also dispersible in some polar solvents |
Purity assessment typically involves high-performance liquid chromatography for the peptide and atomic spectroscopy for copper content. The ratio of copper to peptide is a key quality parameter; a value near one indicates proper stoichiometry. Impurities can include free peptide, copper salts, and truncated sequences from synthesis. Because the complex is dynamic, sample preparation and mobile-phase conditions can shift the observed species. Reported purity values therefore depend on the analytical method and should be interpreted with that context.
Characterizing GHK-Cu requires methods that distinguish the intact complex from free peptide and unbound copper. UV-visible absorption around 600 nm provides a rapid check for copper coordination, while circular dichroism reports on peptide secondary structure. Mass spectrometry confirms the peptide mass and can detect copper adducts under carefully controlled conditions. Electron paramagnetic resonance is particularly informative for Cu(II) because it reveals the ligand field symmetry. No single technique fully defines the complex, so laboratories combine orthogonal methods.
Quality specifications for research material commonly state peptide purity, copper stoichiometry, counter-ion identity, and residual water content. Frequent counter-ions include acetate and trifluoroacetate, which differ in mass and in their effect on solubility and handling. Whether batch-to-batch differences in reported responses trace to these parameters or to assay conditions remains an open question, since published comparisons rarely control for all of them at once. Independent verification therefore normally pairs a purity measurement with an elemental copper measurement on the same lot.
Practical handling notes centre on limiting exposure to water, oxygen, and repeated temperature cycling. Weighed powder is often equilibrated to room temperature before opening to avoid condensation on the solid. Working solutions are typically divided into single-use aliquots and frozen rather than stored refrigerated for long periods. Reported shelf lives vary widely between laboratories, and no single set of conditions is universally treated as a reference standard, which complicates direct comparison of published stability figures.
Solutions of GHK-Cu respond strongly to pH, redox conditions, and the presence of competing chelators such as EDTA. Below roughly pH 4 the copper tends to dissociate, because the amide nitrogen donors become protonated and can no longer coordinate. Strongly alkaline conditions instead favour hydrolysis and precipitation of copper hydroxide. Dissolved oxygen and light accelerate breakdown of the peptide backbone, and the copper released during that process can catalyse further oxidation, so dry, cold, dark storage is the usual recommendation.
Human mitochondrial DNA encodes 13 proteins of the respiratory chain, while most of the estimated 1,500 proteins and components targeted to mitochondria are nuclear-encoded. Defects in nuclear-encoded mitochondrial genes are associated with hundreds of clinical disease phenotypes including anemia, dementia, hypertension, lymphoma, retinopathy, seizures, and neurodevelopmental disorders. A study by Yale University researchers (published in the February 12, 2004, issue of the New England Journal of Medicine) explored the role of mitochondria in insulin resistance among the offspring of patients with type 2 diabetes. Other studies have shown that the mechanism may involve the interruption of the mitochondrial signaling process in body cells (intramyocellular lipids). A study conducted at the Pennington Biomedical Research Center in Baton Rouge, Louisiana showed that this, in turn, partially disables the genes that produce mitochondria.
=== Tour === Clipse announced a United States concert tour in promotion of the album on June 9, consisting of twenty-five planned shows from August 3 to September 10. Atlanta hip-hop duo EarthGang is the planned supporting act. Four dates in Europe were added on July 14, extending the tour's window to November 10.
2A peptides are a class of 18–22 aa-long peptides, which can induce ribosomal skipping during translation of a protein in a biological cell. These peptides share a core sequence motif of DxExNPGP, and are found in a wide range of viral families. 2A peptides can be introduced artificially to help generate polyproteins from a single ORF, by causing the ribosome to fail at making a peptide bond, and then resume translation. The members of 2A peptides are named after the virus in which they have been first described. For example, F2A, the first described 2A peptide, is derived from foot-and-mouth disease virus. The name "2A" itself comes from the gene numbering scheme of this virus. These peptides are also known as "self-cleaving" peptides, which is a known misnomer, because the missing peptide bond is never synthesized by the ribosome, and is thus not cleaved.
The protein is 82.3 kDa and has a 40 amino acid long LEM domain located at its amino-terminal region. In its carboxyl end it has a RNA recognition motif (RRM). The LEM domain is also common to two other integral proteins of the INM: lamina-associated polypeptide 2 (LAP2) and emerin. The LEM segment enables LEMD3 to attach to the barrier-to-autointegration factor (BAF), and therefore, indirectly interact with the chromatin. LEMD3 also has several implications in regulating the cytokine family such as the transforming growth factor beta (TGF-β) and bone morphogenic protein (BMPs). The RRM domain in its carboxylic region attaches to the SMAD (protein) proteins, which is involved in mediating TGF-β cellular signalling. Consequently, LEMD3 indirectly regulates downstream genes. LEMD3 seems to play an important role in regulating the expression of several fundamental genes. LEMD3 has been associated with laminopathies as well as osteopoikilosis. Mutations in the LEMD3 gene have been linked to several genetic diseases such as osteopoikilosis, melorheostosis and Buschke–Ollendorff syndrome.
Because used fuel is allowed to stand for several years before reprocessing, all molybdenum-99 and technetium-99m is decayed by the time that the fission products are separated from the major actinides in conventional nuclear reprocessing. The liquid left after plutonium–uranium extraction (PUREX) contains a high concentration of technetium as TcO−4 but almost all of this is technetium-99, not technetium-99m. The vast majority of the technetium-99m used in medical work is produced by irradiating dedicated highly enriched uranium targets in a reactor, extracting molybdenum-99 from the targets in reprocessing facilities, and recovering at the diagnostic center the technetium-99m produced upon decay of molybdenum-99. Molybdenum-99 in the form of molybdate MoO2−4 is adsorbed onto acid alumina (Al2O3) in a shielded column chromatograph inside a technetium-99m generator ("technetium cow", also occasionally called a "molybdenum cow"). Molybdenum-99 has a half-life of 67 hours, so short-lived technetium-99m (half-life: 6 hours), which results from its decay, is being constantly produced. The soluble pertechnetate TcO−4 can then be chemically extracted by elution using a saline solution. A drawback of this process is that it requires targets containing uranium-235, which are subject to the security precautions of fissile materials.
Sources: en.wikipedia.org
Phenylalkylpyrrolidines like PEP, MPEP, prolintane, α-PPP, α-PVP, pyrovalerone, and MDPV Phenylalkylpiperidines like AC927 (phenethylpiperidine), diphenidine, fentanyl, and ifenprodil Tetrahydroisoquinolines (THIQs) like anhalinine, pellotine, lophophorine, DOM-CR, nomifensine, tetrabenazine, and zelandopam Isoquinolines like perafensine, quinisocaine, and tilisolol Dihydroindoles and aminochromes like adrenochrome and adrenolutin 2-Aminoindanes (2-AIs) like 2-aminoindane, MDAI, MMAI, DOM-AI, and Pyr-AI 2-Aminotetralins (2-ATs) like 2-aminotetralin, MDAT, DOM-AT, 8-OH-DPAT, rotigotine, and UH-232 1-Aminomethylindanes (1-AMIs) like 2CB-Ind, AMMI, jimscaline, and bromojimscaline 3-Benzazepines like fenoldopam and lorcaserin Benzocyclobutenes (BCBs) like 2CBCB-NBOMe, S33005, TCB-2, tomscaline, and bromotomscaline 3-Aminochromans like CT-5126, 5-MeO-DPAC, robalzotan, and ebalzotan Benzoxepins like TFMBOX Phenylmethylpyrrolidines (benzylpyrrolidines) like APA-01 (PharmAla-1) 2-Benzylpiperidines and phenidates like 2-benzylpiperidine, methylphenidate, rimiterol, and DMBMPP Phenylcyclopropylamines like tranylcypromine, TMT, and DMCPA 3-Phenylpiperidines (3PIPs) like 3-phenylpiperidine, 3-PPP, OSU-6162 (PNU-96391), LPH-5, LPH-48, 2C-B-3PIP, 2C-B-3PIP-NBOMe, 2C-B-3PIP-POMe, and Z3517967757 (Z7757) 2-Phenylmorpholines like 2-phenylmorpholine, phenmetrazine, manifaxine, radafaxine, flumexadol, oxaflozane, and PF-219,061 Phenyloxazolamines or aminorex analogues like aminorex and pemoline Tricyclic compounds like benzoctamine and dizocilpine Ergolines and lysergamides like ergine (LSA) and LSD Partial ergolines and lysergamides like NDTDI, RU-27849, UCD0179, and UCD0120 Pyridopyrroloquinoxalines like lumateperone, IHCH-7113, IHCH-7086, and ITI-1549 Anthracenes like AMDA and SpAMDA Phenanthrenes like atherosperminine Aporphines like aporphine, apomorphine, glaucine, and nuciferine Others like 6-AB, 2-ADN, 2C-B-PYR, 2C-B-5-hemiFLY-α6 (BNAP), 2CB7 (2C-B-5-hemiFLY-β7), 2CBecca, 2CJP, 2CLisaB, 2CLisaH, 2-naphthylamine, AMMI, GYKI-52895, ivabradine, milnacipran, Org 6582, and ZC-B Some additional cyclized phenethylamines have also been described. Other related families that are not phenethylamines themselves include phenylpiperazines, benzylpiperazines, and 4-phenylpiperidines.
The Senate consisted of 90 senators, ten nominated by each of the nine provinces. It was chaired by a President of the Senate elected by the senators from among themselves. The National Assembly consists of 400 members, elected by voters on a proportional representation/party list system. There are no electoral districts, and each party is allocated a number of seats proportionate to the percentage of the votes it receives across the country. It is chaired by a Speaker elected by the MPs from among themselves. In 1997, the current Constitution of South Africa came into force, in which the Senate was replaced by a 90-member National Council of Provinces (NCOP), made up of a 10-member delegation from each province (six delegates elected by the provincial legislature, the Premier and three other members of the provincial legislature). The NCOP is chaired by a Chairperson elected by the members from among themselves. The parliamentary system uses proportional representation, with voters voting for political parties rather than for candidates. Proportional representation allows for smaller parties to have a chance of acquiring seats in parliament, although these parties often combine in order to have a stronger voice within the political system, especially against the ANC. The Electoral Commission of South Africa is charged with keeping elections fair, regular, and equal. Parties submit closed lists of candidates to the IEC, and the IEC fills the seats allotted to individual parties using the candidate lists after election results come in.
== Contraindications == Artesunate is typically a well tolerated medicine. Known contraindications include a previous severe allergic reaction to artesunate. Drugs that should be avoided while on artesunate are the drugs that inhibit the liver enzyme CYP2A6. These drugs include amiodarone, desipramine, isoniazid, ketoconazole, letrozole, methoxsalen and tranylcypromine.
=== Journal articles === —— (1927). "The Theoretical Prediction of the Physical Properties of Many-Electron Atoms and Ions. Mole Refraction, Diamagnetic Susceptibility, and Extension in Space". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 114 (767): 181–211. Bibcode:1927RSPSA.114..181P. doi:10.1098/rspa.1927.0035. —— (1929). "The Principles Determining the Structure of Complex Ionic Crystals". Journal of the American Chemical Society. 51 (4): 1010–1026. Bibcode:1929JAChS..51.1010P. doi:10.1021/ja01379a006. —— (1931). "The Nature of the Chemical Bond. I. Application of Results Obtained from the Quantum Mechanics and from a Theory of Paramagnetic Susceptibility to the Structure of Molecules". Journal of the American Chemical Society. 53 (4): 1367–1400. Bibcode:1931JAChS..53.1367P. doi:10.1021/ja01355a027. —— (1931). "The Nature of the Chemical Bond. II. The One-Electron Bond and the Three-Electron Bond". Journal of the American Chemical Society. 53 (9): 3225–3237. Bibcode:1931JAChS..53.3225P. doi:10.1021/ja01360a004. —— (1932). "The Nature of the Chemical Bond. III. The Transition from One Extreme Bond Type to Another". Journal of the American Chemical Society. 54 (3): 988–1003. Bibcode:1932JAChS..54..988P. doi:10.1021/ja01342a022. —— (1932). "The Nature of the Chemical Bond. IV. The Energy of Single Bonds and the Relative Electronegativity of Atoms". Journal of the American Chemical Society. 54 (9): 3570–3582. Bibcode:1932JAChS..54.3570P. doi:10.1021/ja01348a011. ——; Wheland, G. W. (1933). "The Nature of the Chemical Bond. V.
The same property causes ultraviolet sunlight to dissociate volatile organobromine compounds in the atmosphere to yield free bromine atoms, causing ozone depletion. As a result, some organobromine compounds—such as the pesticide methyl bromide—are no longer used. Bromine compounds are still used in well drilling fluids, in photographic film, and as an intermediate in the manufacture of organic chemicals. Large amounts of bromide salts are toxic from the action of soluble bromide ions, causing bromism. However, bromine is beneficial for human eosinophils, and is an essential trace element for collagen development in all animals. Hundreds of known organobromine compounds are generated by terrestrial and marine plants and animals, and some serve important biological roles. As a pharmaceutical, the simple bromide ion (Br−) has inhibitory effects on the central nervous system, and bromide salts were once a major medical sedative, before replacement by shorter-acting drugs. They retain niche uses as antiepileptics.
Sources: en.wikipedia.org
== Procedure == IEF involves adding an ampholyte solution into immobilized pH gradient (IPG) gels. IPGs are the acrylamide gel matrix co-polymerized with the pH gradient, which result in completely stable gradients except the most alkaline (>12) pH values. The immobilized pH gradient is obtained by the continuous change in the ratio of immobilines. An immobiline is a weak acid or base defined by its pK value. A protein that is in a pH region below its isoelectric point (pI) will be positively charged and so will migrate toward the cathode (negatively charged electrode). As it migrates through a gradient of increasing pH, however, the protein's overall charge will decrease until the protein reaches the pH region that corresponds to its pI. At this point it has no net charge and so migration ceases (as there is no electrical attraction toward either electrode). As a result, the proteins become focused into sharp stationary bands with each protein positioned at a point in the pH gradient corresponding to its pI. The technique is capable of extremely high resolution with proteins differing by a single charge being fractionated into separate bands. Molecules to be focused are distributed over a medium that has a pH gradient (usually created by aliphatic ampholytes). An electric current is passed through the medium, creating a "positive" anode and "negative" cathode end. Negatively charged molecules migrate through the pH gradient in the medium toward the "positive" end while positively charged molecules move toward the "negative" end.
=== Multiple Reaction Monitoring (MRM) === Although MRM has been used extensively in metabolomics and proteomics, its high sensitivity and linear response over a wide dynamic range make it especially suited for glycan biomarker research and discovery. MRM is performed on a triple quadrupole (QqQ) instrument, which is set to detect a predetermined precursor ion in the first quadrupole, a fragmented in the collision quadrupole, and a predetermined fragment ion in the third quadrupole. It is a non-scanning technique, wherein each transition is detected individually and the detection of multiple transitions occurs concurrently in duty cycles. This technique is being used to characterize the immune glycome. Table 1: Advantages and disadvantages of mass spectrometry in glycan analysis
We have begun to clear Nuevo Laredo of Zetas because we want a free city and so you can live in peace. We are narcotics traffickers and we don't mess with honest working or business people. I'm going to teach these scums to work Sinaloa style—without kidnapping, without payoffs, without extortion. As for you, 40, I tell you that you don't scare me. I know you sent H to toss heads here in my turf, because you don't have the stones nor the people to do it yourself. Don't forget that I'm your true father. Nuevo Laredo is considered a stronghold of Los Zetas, although there were incursions by the Sinaloa Cartel in March 2012. Consequently, Los Zetas responded two days later with incursions to Sinaloa, the home state of the Sinaloa Cartel. The Sinaloa Cartel's first attempt to take over Nuevo Laredo happened in 2005, when Los Zetas was working as the armed wing of the Gulf Cartel.
== Awards == Major Awards 1. Young Scientist Medal (1988), by the Indian Science Congress Association, India. 2. INSA Young Scientist Medal (1991), by the Indian National Science Academy, New Delhi. 3. CRSI Bronze Medal (2002), by the Chemical Research Society of India. 4. MRSI Medal (2007), by Material Research Society of India. 5. Shanti Swarup Bhatnagar Prize (2007), awarded by CSIR, Govt. India. 6. DAE Outstanding Researcher Award (2009), awarded by Dept. Atomic Energy, Govt. India. 7. Thomson Reuters Research Excellence-India Research Front Award (2009). 8. The Infosys Prize for Physical Sciences 2012 by Infosys Science Foundation. 9. Khwarizmi International Award 2012 by Iranian Organisation for Science and Technology. 10. Swadeshi Innovation Award 2012 by the Swadeshi Science Movement, Kerala. 11. Sri Vidyadhiraja Samskrithi Puraskaram 2013 by Panmana Ashram, Quilon, Kerala. 12. CRSI Silver Medal 2013 by Chemical Research Society of India. 13. TWAS Chemistry Prize 2013 by The World Academy of Sciences, Trieste, Italy. 14. ISAS National Award for Excellence in Science and Technology 2014 by Indian Society of Analytical Scientists. 15. CHEMTECH CEW Award 2015 for Leadership and Excellence in Research and Development. 16. J. C. Bose National Fellowship, 2015, DST, Govt. India. 17. Web of Science-India Research Excellence-Citation Award 2017 by Clarivate Analytics. 18. MRSI Distinguished Lectureship Award, 2019-20, by Materials Research Society of India. 19. Goyal Prize for Chemical Science, 2019, by Kurukshetra University. Other Honors 1.
Advasil Conform: Polyurethane film backing and self-adhesive Bapscarcare T: Self-adhesive Cica-care: Soft, self-adhesive, and semi-occlusive with backing Ciltech: Polyurethane film backing and self-adhesive Dermatix: Self-adhesive (transparent or fabric-backed) Mepiform: Polyurethane film backing and self-adhesive Myscar: Medical grade silicone Scar FX: Self-adhesive and transparent Silgel: Thin and transparent Scarcura: Self-adhesive, soft
Sources: en.wikipedia.org
It is the copper complex of the tripeptide glycyl-L-histidyl-lysine. The metal ion is held by the histidine imidazole group and the peptide N-terminus. Most research on it concerns skin and wound models.
The tripeptide was first isolated from human plasma and has also been reported in saliva and urine. Plasma levels appear to decline with age in some small studies. Those observations rest on limited sample sizes.
It is not authorized as a systemic medicine in most countries. Cosmetic preparations list it as an ingredient rather than an active pharmaceutical substance. Legal status therefore differs by jurisdiction.
The letters GHK are the one-letter codes for glycine, histidine and lysine, the three amino acids in the peptide. The suffix Cu indicates that the peptide is bound to a copper ion, normally copper(II).