Albumin conjugation is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2025-12-08. Where a claim depends on a specific study, the study is described rather than over-claimed.
Four amino acid substitutions separate the modified backbone from the parent GRF(1-29) sequence. These changes reduce recognition by dipeptidyl peptidase IV and related proteases, extending the interval before degradation. Development work in this area sought longer-acting GHRH analogs for endocrine investigation. Published descriptions treat the substitution set as a defining property of the core sequence, while the albumin-binding linker is described separately as an optional addition to that same backbone.
CJC-1295 is a synthetic peptide analog of growth hormone-releasing hormone, constructed on the 29-amino-acid fragment designated GRF(1-29). The name began as an internal development code during the 1990s and later spread through research supply catalogs and discussion forums. The molecule does not occur in nature; its sequence is engineered rather than isolated from tissue. Two related compounds are sold under this single label, and they differ by one appended chemical group that strongly influences how long the peptide remains in circulation.
The drug affinity complex is a maleimidopropionic acid group attached to a lysine side chain. It reacts with the free thiol of cysteine-34 on circulating albumin, forming a covalent bond. This conjugation keeps the peptide in the bloodstream and shields it from rapid renal filtration and proteolysis. Reported circulation half-lives for the albumin-bound form fall in the range of roughly six to nine days in early human studies.
Binding to GHRH receptors on pituitary somatotroph cells triggers cyclic AMP signaling and stimulates growth hormone synthesis and release. Because the peptide acts upstream of the pituitary, effects are mediated through endogenous growth hormone rather than direct receptor activation in peripheral tissues. Increases in insulin-like growth factor 1 are generally described as a downstream consequence. Most published human exposure data come from small early-stage studies, and the clinical significance of the pharmacokinetic profile remains incompletely characterized.
CJC-1295 is a synthetic analogue of growth hormone-releasing hormone, built on the 29-amino-acid GHRH(1-29) fragment. Four substitutions distinguish it from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes reduce enzymatic cleavage and extend the peptide's persistence in circulation. The compound is discussed in two forms, one carrying a drug affinity complex and one without it.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | Analog of growth hormone-releasing hormone |
| Chain length | 29 amino acids | Based on the GRF(1-29) fragment |
| Appearance | White to off-white lyophilized powder | Common research supply form |
| Solubility | Soluble in water and aqueous buffers | Powder requires reconstitution before use |
| Typical storage | −20 °C or below | Kept away from light and moisture |
CJC-1295 is a synthetic peptide built as a long-acting analogue of growth hormone-releasing hormone. Its backbone matches the first twenty-nine residues of the natural human hormone, with four amino acid substitutions added to slow enzymatic breakdown. A reactive maleimide group, commonly termed the drug affinity complex, allows the peptide to attach to circulating albumin after administration. That albumin attachment keeps the molecule in the bloodstream for an extended period instead of being cleared within minutes.
The compound emerged from work at a Canadian biotechnology firm in the early 2000s. Early human studies examined its effect on growth hormone and insulin-like growth factor 1 in healthy volunteers and in people with HIV-associated fat redistribution. Reports described sustained increases in both markers after a single injection. Development did not advance to regulatory approval, and the clinical programme was later discontinued. The molecule is now encountered mainly as a research chemical rather than a marketed medicine.
CJC-1295 belongs to a family of synthetic peptides modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound is built from the first twenty-nine amino acids of the natural human sequence, a fragment that retains full receptor binding capacity. Native growth hormone-releasing hormone is degraded quickly in circulation, so the fragment alone has limited practical value. Early work therefore focused on chemical modifications that preserve receptor binding while slowing enzymatic breakdown. The result is a molecule described in the literature as a long-acting analog of the natural hormone.
Two forms circulate under the CJC-1295 name, and they differ by a single appended group. The version without a drug affinity complex carries four substitutions along the peptide chain, including a D-alanine near the amino terminus and replacements at three other positions. These changes block the enzyme dipeptidyl peptidase IV and remove a methionine residue that is prone to oxidation. The modified fragment is frequently labeled MOD GRF 1-29. Naming conventions are inconsistent across informal sources, which is a common source of confusion.
The second form adds a maleimide-bearing linker to the lysine at the carboxyl end. This group reacts with cysteine-34 on circulating serum albumin, forming a covalent bond that keeps the peptide in the bloodstream for far longer. ConjuChem developed the molecule as a way to extend the action of a peptide without frequent administration. The albumin attachment is the defining structural feature of the drug affinity complex version. Whether continuous exposure produces effects distinct from shorter pulses remains an unresolved research question.
Characterization of this peptide relies on a small set of routine techniques. Reversed-phase high-performance liquid chromatography separates the target from truncated or oxidized by-products and yields a purity estimate when paired with ultraviolet detection near 214 nanometers. Mass spectrometry, either electrospray coupled to liquid chromatography or matrix-assisted laser desorption, confirms that the observed mass matches the value calculated for the expected sequence. Amino acid analysis, and enzymatic digestion followed by fragment mapping, are used when the sequence itself rather than the mass requires verification.
Stability depends heavily on physical state. A lyophilized powder kept dry, desiccated, and shielded from light typically holds its integrity for months to years at minus twenty degrees Celsius, and longer at minus eighty. Once dissolved, the peptide becomes far more vulnerable, since peptide bond hydrolysis, oxidation of susceptible residues, and aggregation all proceed faster in solution. Buffers near neutral pH are generally gentler than strongly acidic or alkaline conditions. Repeated freeze-thaw cycles and exposure to air-liquid interfaces during vigorous mixing cause losses that are easy to overlook.
14 June Vodafone and Three announce a merger, pending approval from regulators, to create the largest mobile company in the UK. Thousands of people gather for a vigil to mourn the victims of the attacks in Nottingham. Police continue questioning a suspect, as the BBC obtains CCTV footage of a man believed to be the perpetrator. Researchers at the University of Cambridge report the creation of the first synthetic human embryo from stem cells, without the need for sperm or egg cells. 15 June Partygate: A 13-month investigation by the House of Commons' Privileges Committee concludes that ex-Prime Minister Johnson deliberately misled the Commons over gatherings during pandemic restrictions at 10 Downing Street and Chequers. The report proposes that he would be suspended for 90 days if still an MP. It states that he deliberately misled the House and the committee, impugned the committee and was "complicit in the campaign of abuse and attempted intimidation of the Committee". The Parole Board announces that double child killer and rapist Colin Pitchfork has been granted parole and will be released from prison. Alberto Costa, MP for South Leicestershire where the girls were killed, writes to the Justice Secretary to seek "an immediate and urgent review" of the decision. 16 June A hosepipe and sprinkler ban is announced for Kent and Sussex, beginning on 26 June, after water demand hits record levels.
1833: English phycologists Amelia Griffiths and Mary Wyatt published two books on local British seaweeds. Griffiths had an internationally respected reputation as a skilled seaweed collector and scholar, and Swedish botanist Carl Agardh had earlier named the seaweed genus Griffithsia in her honour. 1833: American botanical and scientific illustrator Orra White Hitchcock was best known for illustrating the scientific works of her husband, geologist Edward Hitchcock (1793–1864), but was also notable for her own artistic and scientific work. The most well known appear in her husband's seminal works, the 1833 Report on the Geology, Mineralogy, Botany, and Zoology of Massachusetts and its successor, the 1841 Final Report produced when he was State Geologist. For the 1833 edition, Pendleton's Lithography (Boston) lithographed nine of Hitchcock's Connecticut River Valley drawings and printed them as plates for the work. In 1841, B. W. Thayer and Co., Lithographers (Boston) printed revised lithographs and an additional plate. The hand-colored plate "Autumnal Scenery. View in Amherst" is Hitchcock's most frequently seen work. 1835: Scottish polymath Mary Somerville and German astronomer Caroline Herschel were elected the first female members of the Royal Astronomical Society. 1836: Early English geologist and paleontologist Etheldred Benett, known for her extensive collection of several thousand fossils, was appointed a member of the Imperial Natural History Society of Moscow.
In 2003 the Americana Music Awards awarded Parsons with the President's Award, which was accepted by his daughter. The 2003 film Grand Theft Parsons stars Johnny Knoxville as Phil Kaufman and chronicles a farcical version of the theft of Parsons' corpse. In 2006, Gandulf Hennig released the documentary Gram Parsons: Fallen Angel. In 2004, Parsons' daughter Polly produced two tribute concerts titled "Return to Sin City: A Tribute to Gram Parsons". Artists included Keith Richards, James Burton, Lucinda Williams, Norah Jones, Dwight Yoakam, John Doe, Steve Earle, Jim Lauderdale, Kathleen Edwards, Jay Farrar, Jim James, Raul Malo, Susan Marshall, and the Sin City All Stars. The concert produced a DVD and 100% of the concerts was donated through the Gram Parsons Foundation to the Musician's Assistance Program (now MusiCares), which aids musicians in crisis. Despite his influence, Parsons has yet to be inducted into the Country Music Hall of Fame. The Gram Parsons Petition Project (later named Gram Parsons InterNational) was begun in May 2008 in support of a drive to induct Parsons into the Country Music Hall of Fame. On September 19, 2008, the 35th anniversary of Parsons' death, it was presented to the Country Music Association (CMA) with the official Nomination Proposal. Parsons was inducted in the Rock and Roll Hall of Fame in 2026 through the influence category. In November 2009, the musical theatre production Grievous Angel: The Legend of Gram Parsons premiered, starring Anders Drerup as Gram Parsons and Kelly Prescott as Emmylou Harris.
== Screening == Because it can be difficult to measure weight-for-height Z scores (WHZ) frequently, screening is performed by physical exam, with careful examination of the child's feet to detect the presence of bilateral pitting edema. Screening for edema is essential for the diagnosis of kwashiorkor, since nearly two-thirds of kwashiorkor cases do not have evidence of acute wasting (i.e. mid-upper arm circumference (MUAC) < 125 mm, or WHZ < -2) when diagnosed with kwashiorkor.
Sources: en.wikipedia.org
The other settings were available to block out interference, but did so by also blocking some of the signal which reduced the overall sensitivity of the system. The output of the mixer was sent to the Y-axis deflection plates in a specially designed high-quality CRT. For reasons not well explained in the literature, this was arranged to deflect the beam downward with increasing signal. When combined with the X-axis signal from the time base generator, echoes received from distant objects caused the display to produce blips along the display. By measuring the centre point of the blip against a mechanical scale along the top of the display, the range to the target could be determined. This measurement was later aided by the addition of the calibrator unit or strobe, which caused additional sharp blips to be drawn every 10 miles (16 km) along the display. The markers were fed from the same electronic signals as the time base, so it was always properly calibrated.
A more recent application of bone grafting is its use as an antibiotic carrier. Infected bone is poorly perfused, making it difficult to achieve an appropriate antibiotic concentration at the site of infection when intravenous administration is used, especially for antibiotics with large molecules such as vancomycin. In such cases, impacted morcellized bone allografts (IBG), impregnated with local antibiotics can achieve much higher concentrations of antibiotics locally than the minimum inhibitory concentration (MIC).
One example of a paper-based microfluidic device utilizing electrochemical detection has a dumbbell shape to isolate plasma from whole blood. The current from the hydrogen peroxide produced in the aforementioned catalytic cycle is measured and converted into concentration of glucose.
Sources: en.wikipedia.org
Member, National Teaching School Council and Lead, South-West National Teaching School Council Representative. For services to Education. Chitralekha Bolar. Dancer, Choreographer and Teacher. For services to South Asian Dance. Emily Josephine Bolton. Founder, Our Future. For services to Social Mobility. Thomas Stewart Bosworth. For services to Race Walking. Richard James Bottomley. Headteacher, Bradford Alternative Provision Academy. For services to Vulnerable Children and Young People. James David Boyes. Team UK Gold Medal Winner, WorldSkills UK. For services to Further Education. Nicholas Boys Smith. Founder and Director, Create Streets and Chair, Office for Place. For services to Planning and Design. Samuel James Braddick. For services to the community in Gillingham, Dorset. Mark Richard Brett. For services to Charity and to the community in Wallingford, Oxfordshire. Anne Brewster. 50 Plus Lead, Yorkshire and the Humber, Department for Work and Pensions. For services to the Welfare of Older People. Debbie Hazel Brown. Advanced Nurse Practitioner and Clinical Director, Lewisham Community Education Provider Network Training Hub. For services to Nursing and the NHS. Joanna Esther Brown (Joanna Cram). Lately Chair, Scottish Osteopathic Society. For services to Musculoskeletal Healthcare in Scotland. Patricia Ann Brown. Director and Founder, Central. For services to the Built Environment. Penelope Jane Brown. For services to Charity and to the community in Salisbury, Wiltshire. Sara Margaret Browne (Sally Browne).
== External links == American Association for Clinical Chemistry American Society for Clinical Pathology American Board of Pathology College of American Pathologists European Federation of Clinical Chemistry and Laboratory Medicine Academy of Clinical Laboratory Physicians and Scientists
== Safety == Due to reclassification as UN0508, a class 1.3C explosive, hydroxybenzotriazole and its monohydrate crystal are no longer allowed to be transported by sea or air as per 49CFR (USDOT hazardous materials regulations). However, UNECE draft proposal ECE/TRANS/WP.15/AC.1/HAR/2009/1 has been circulated to UN delegates and, if implemented, would amend current regulations thus allowing for the monohydrate crystal to be shipped under the less-stringent code of UN3474 as a class 4.1 desensitized explosive. HOBt was demonstrated to not exhibit dermal corrosion or irritation but did exhibit eye irritation. The sensitization potential of HOBt was shown to be low (non-sensitizing at 1% in LLNA testing according to OECD 429).
Sources: en.wikipedia.org
No. It is a laboratory-synthesized analog built on a fragment of the natural hormone. The natural peptide is shorter-lived and lacks the stabilizing substitutions found in the synthetic version.
DAC stands for drug affinity complex, a chemical group that binds the peptide to serum albumin. The binding slows clearance and lengthens the time the molecule stays in plasma compared with the unmodified analog.
Because two distinct molecules are discussed under one informal label. The albumin-binding version clears over several days, while the form without that group clears within roughly half an hour. Mixing results from both creates inconsistent figures.
The two share the same 29-amino-acid backbone. CJC-1295 carries an additional albumin-binding moiety that markedly extends its residence time in circulation, while the form without that moiety clears faster. Literature sometimes applies the name loosely to either variant.