A practical reference on GRF(1-29): what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
The dividing feature between the two forms is a maleimide-based drug affinity complex, abbreviated DAC. In the DAC-bearing version, a linker attaches the peptide to serum albumin after administration, and that association slows removal from plasma. The version lacking DAC appears in catalogs as MOD GRF(1-29) or tetrasubstituted GRF(1-29). Because informal writing treats both as one item, comparisons drawn from such sources routinely blend measurements taken from two molecules with substantially different behavior.
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.
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.
| 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 |
The core sequence keeps the receptor-binding region of GHRH while replacing four positions that are vulnerable to dipeptidyl peptidase-4 and other proteases. Substitutions at positions 2, 8, 15, and 27 raise metabolic stability relative to the natural hormone. The N-terminal residues remain essential for activity, so changes there generally lower potency. Molecular weight sits near 3368 daltons for the tetrasubstituted analog without the linker, while the albumin-binding form is heavier because of the added maleimide group.
CJC-1295 is a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. Its sequence corresponds to the first twenty-nine residues of human GHRH, with four substitutions that slow enzymatic breakdown. Early descriptions placed the compound in research on growth hormone deficiency and related conditions, and later literature groups it with the long-acting GHRH analogs. The name appears in both laboratory and popular fitness writing, where it sometimes labels chemically different peptides.
Two related forms circulate in technical discussion under the same family name. The original version carries a drug affinity complex (DAC) that binds covalently to serum albumin after administration, and this linkage substantially extends circulation time. A second form, frequently written as modified GRF(1-29) or CJC-1295 without DAC, lacks that linker and clears much faster. The naming is a frequent source of confusion because the shorthand CJC-1295 can refer to either form depending on the source. Reports sometimes fail to specify which variant was studied.
The peptide backbone includes a D-alanine at position two, which resists cleavage by dipeptidyl peptidase IV, and several other substitutions that reduce degradation. Its molecular weight is roughly 3.4 kDa without the linker and about 3.6 kDa with it. The molecule is water soluble and is normally supplied as a lyophilized powder. Precise sequence and mass values depend on which variant is described, so technical documents usually state the exact form being referenced.
CJC-1295 is a synthetic peptide designed as a long-acting analogue of growth hormone-releasing hormone (GHRH). Its structure derives from the first 29 amino acids of native GHRH, a fragment often called GRF(1-29). Four substitutions were introduced to slow enzymatic breakdown and extend activity relative to the natural sequence. The compound was developed by ConjuChem as part of a broader effort to improve the pharmacokinetic profile of peptide hormones. It is studied in laboratory and clinical research settings rather than appearing as a naturally occurring substance.
=== France === This data pertains to reported medical cases of 23 specific pathogens in the 1990s, as opposed to total population estimates of all foodborne illness for the United States. In France, for 735,590 to 769,615 cases of infection identified as being with the 23 specific pathogens, 238,836 to 269,085 were estimated to have been contracted from food:
The açaí palm ( ə-SY-ee, Brazilian Portuguese: [asaˈi] ; from Nheengatu asai), Euterpe oleracea, is a species of palm tree (Arecaceae) cultivated for its fruit (açaí berries, or simply açaí), hearts of palm (a vegetable), leaves, and trunk wood. Global demand for the fruit has expanded rapidly in the 21st century, and the tree is cultivated for that purpose primarily. The species is native to eastern Amazonia, especially in Brazil, mainly in swamps and floodplains. Açaí palms are tall, slender trees growing to more than 25 m (82 ft) tall, with pinnate leaves up to 3 m (9.8 ft) long. The fruit is small, round, and black-purple in color. The fruit became a staple food in floodplain areas around the 18th century, but its consumption in urban areas and promotion as a health food only began in the mid-1990s along with the popularization of other Amazonian fruits outside the region.
Type 1 diabetes (T1D), or type 1 diabetes mellitus, is an autoimmune disease that occurs when the body's immune system destroys beta cells in the pancreas that produce the hormone insulin. Insulin is used by the body to store and convert blood sugar into energy. T1D results in high blood sugar levels in the body prior to treatment due to the lack of insulin. Common symptoms include frequent urination (polyuria), increased thirst (polydipsia), increased hunger (polyphagia), weight loss, and other changes. Additional symptoms may include blurry vision, tiredness, and slow wound healing (owing to impaired blood flow). While some cases take longer, symptoms usually appear within weeks to a few months. The cause of type 1 diabetes is not completely understood, but it is believed to involve an autoimmune attack caused by a combination of genetic and environmental factors. The underlying mechanism involves an autoimmune destruction of the insulin-producing beta cells in the pancreas. Diabetes is diagnosed by testing the level of sugar or glycated hemoglobin (HbA1C) in the blood. Type 1 diabetes can be distinguished from type 2 by testing for the presence of autoantibodies and/or declining levels/absence of C-peptide. C-peptide is a product cleaved from proinsulin in the production of insulin. In type 1 diabetes its levels are low or absent. In type 2 diabetes the blood levels are high, as insulin production is high due to insulin resistance. There is currently no known way to prevent type 1 diabetes. Treatment with insulin is required for survival.
==== Male reproductive system ==== The effect of estradiol (and estrogens in general) upon male reproduction is complex. Estradiol is produced by action of aromatase mainly in the Leydig cells of the mammalian testis, but also by some germ cells and the Sertoli cells of immature mammals. It functions (in vitro) to prevent apoptosis of male sperm cells. While some studies in the early 1990s claimed a connection between globally declining sperm counts and estrogen exposure in the environment, later studies found no such connection, nor evidence of a general decline in sperm counts. Suppression of estradiol production in a subpopulation of subfertile men may improve the semen analysis. Males with certain sex chromosome genetic conditions, such as Klinefelter's syndrome, will have a higher level of estradiol.
== Methods of preparation == Various methods used to prepare liposomes are also suitable for niosome preparation, such as the ether injection method, the handshaking method, the reverse phase evaporation method, the trans-membrane pH gradient method, the "bubble" method, the microfluidization method, formation from proteasomes, the thin-film hydration method, the heating method, the freeze and thaw method, and the dehydration-rehydration method.
Sources: en.wikipedia.org
The tropylium ion or cycloheptatrienyl cation is an aromatic species with a formula of [C7H7]+. Its name derives from the molecule tropine from which cycloheptatriene (tropylidene) was first synthesized in 1881. Salts of the tropylium cation can be stable, even with nucleophiles of moderate strength e.g., tropylium tetrafluoroborate and tropylium bromide (see below). Its bromide and chloride salts can be made from cycloheptatriene and bromine or phosphorus pentachloride, respectively. It is a regular heptagonal, planar, cyclic ion. It has 6 π-electrons (4n + 2, where n = 1), which fulfills Hückel's rule of aromaticity. It can coordinate as a ligand to metal atoms. The structure shown is a composite of seven resonance contributors in which each carbon atom carries part of the positive charge.
=== Notable individuals === Charlie "Bird" Parker, the jazz saxophonist, is said to have used nutmeg recreationally. Malcolm X once tried nutmeg while in prison in 1946, remarking that it "had the kick of three or four reefers". Richard Meltzer, the rock critic, is known to have tried nutmeg, expressing that it caused him to experience all music as identical. William S. Burroughs tried nutmeg once and found it vaguely similar to cannabis but with more side effects.
Artistic Achievement – Hellblade: Senua's Sacrifice Audio Achievement – Hellblade: Senua's Sacrifice Best Game – What Remains of Edith Finch British Game – Hellblade: Senua's Sacrifice Debut Game – Gorogoa Evolving Game – Overwatch Family – Super Mario Odyssey Game Beyond Entertainment – Hellblade: Senua's Sacrifice Game Design – Super Mario Odyssey Game Innovation – The Legend of Zelda: Breath of the Wild Mobile Game – Golf Clash Multiplayer – Divinity: Original Sin II Music – Cuphead Narrative – Night in the Woods Original Property – Horizon Zero Dawn Performer – Melina Juergens (as Senua, Hellblade: Senua's Sacrifice) Special Award: Nolan North
The revisionist interpretation produced a critical reaction of its own. In a variety of ways, "post-revisionist" scholarship before the fall of Communism challenged earlier works on the origins and course of the Cold War. During the period, "post-revisionism" challenged the "revisionists" by accepting some of their findings, but rejecting most of their key claims. Another current attempt to strike a balance between the "orthodox" and "revisionist" camps, identifying areas of responsibility for the origins of the conflict on both sides. For example, Thomas G. Paterson in Soviet-American Confrontation (1973) viewed Soviet hostility and United States efforts to dominate the postwar world as equally responsible for the Cold War. The seminal work of this approach was John Lewis Gaddis's The United States and the Origins of the Cold War, 1941–1947 (1972). The account was immediately hailed as the beginning of a new school of thought on the Cold War claiming to synthesize a variety of interpretations. Gaddis then maintained that "neither side can bear sole responsibility for the onset of the Cold War". However, he emphasized the constraints imposed on United States policymakers by the complications of domestic politics. In addition, Gaddis has criticized some revisionist scholars, particularly Williams, for failing to understand the role of Soviet policy in the origins of the Cold War. Gaddis's 1983 distillation of post-revisionist scholarship became a major channel for guiding subsequent Cold War research.
== History and Synthesis == Phenoperidine was first synthesized in 1957 by Paul Janssen, of the company now known as Janssen Pharmaceutica, who was seeking better opioid pain-killers. His two prototype drugs were methadone and pethidine, each which had been invented in 1930s by Otto Eisleb, who worked for IG Farben. His initial work starting with methadone yielded dextromoramide in 1954. Janssen then turned to making pethidine analogues, due in part to the less complicated chemistry of the compound. During his explorations, he replaced the methyl group attached to the pethidine nitrogen with a phenylhydroxypropyl group, and this yielded phenoperidine, in 1957. Phenoperidine was determined to have decreased stability and enhanced lipophilicity compared to pethidine. Soon after, studies in mice showed that phenoperidine was over 100 times more potent than pethidine. In 1958, the same line of work yielded "one of the greatest advances of the 20th century psychiatry", haloperidol, as well as diphenoxylate, which lacked the opioid's analgesic properties but still stopped peristalsis in the intestines, a typical side effect of opioids; Janssen brought diphenoxylate to market as a drug to treat diarrhea. And through further advances, Janssen created fentanyl in 1960, which proved to be ten times more potent than phenoperidine.
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.
Natural GHRH is degraded quickly by dipeptidyl peptidase-4 and related enzymes, giving it a half-life measured in minutes. CJC-1295 carries substitutions that slow that breakdown, so it stays intact longer. Both act at the same pituitary receptor and produce the same class of signal.