This is a working overview of Lyophilized powder, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-02-12 and is reviewed periodically as new material appears.
BPC-157 is a synthetic fifteen-amino-acid peptide whose sequence is GEPPPGKPADDAGLV. Its name derives from the phrase body protection compound, a term applied to a protein fraction originally detected in human gastric juice. The short peptide is not that full protein; it corresponds to a stable fragment of the larger molecule. Researchers frequently describe it as a pentadecapeptide because it contains exactly fifteen residues. Its neutral molecular mass is approximately 1419 daltons.
The sequence places several glycine and proline residues near the middle, which may influence how the chain folds in solution. The peptide is linear rather than cyclic, and it carries no disulfide bridges. Commercial material is commonly supplied as the acetate salt, although the free base and other counterion forms also appear. Because the term BPC-157 refers to a specific sequence, samples with slight sequence variants are chemically different substances. Published work generally treats the fifteen-residue sequence as the defining structure.
Long-term storage of the dry powder is typically described at minus twenty degrees Celsius or colder, while shorter holding periods may use ordinary refrigeration. Repeated warming and cooling cycles are discouraged because they stress the material and can promote aggregation or loss. Light exposure and residual moisture are both treated as avoidable sources of degradation, and working aliquots are often prepared to limit how many times a container is opened. Sealed vials with a desiccant are the usual container.
Quality assessment rests on two separate questions: whether the chain is the intended one, and how much of the sample is that chain. Reverse-phase high-performance liquid chromatography with ultraviolet detection is the standard purity measurement, while mass spectrometry confirms identity through the observed molecular mass. Amino acid analysis and sequence verification provide further checks. A reported purity percentage describes the proportion of the sample represented by the main peak, not the amount of peptide by mass, since counter-ions and water make up part of any lyophilized lot.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C62H98N16O22 | Approximate, for sequence GEPPPGKPADDAGLV |
| Molecular mass | ~1419 Da | Neutral form |
| Appearance | White to off-white powder | Lyophilized solid |
| Solubility | Soluble in water | Also soluble in aqueous buffers |
| Typical storage | -20 C | Dry powder, protected from moisture |
BPC-157 is a synthetic peptide composed of fifteen amino acid residues, with the sequence Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val. Its name derives from body protection compound, a term used for a protein fraction identified in human gastric juice. Researchers in Zagreb first reported the pentadecapeptide in the early 1990s and described it as a stable fragment of that larger protein. The compound is also catalogued as PL 14736 and, in some commercial contexts, as bepecin. Its molecular formula is C62H98N16O22 and its monoisotopic mass is approximately 1419 daltons.
Most published work on BPC-157 consists of preclinical studies, including rodent models of tissue injury, gastrointestinal lesions, and vascular or tendon damage, together with in vitro cell assays. Reviews frequently note that the mechanisms proposed in these papers remain incompletely characterised and that findings have not been confirmed in large randomised human trials. The compound is widely sold as a research chemical rather than a licensed medicine, and labels commonly carry a statement that it is not for human use. Whether any of the reported animal effects translate to humans is an open question rather than an established result.
Terminology in the literature is not fully standardised. Papers and product listings use BPC-157, BPC 157, and the longer phrase stable gastric pentadecapeptide BPC 157 interchangeably, and synonyms such as bepecin or PL 14736 appear in older or company-linked publications. Purity claims and reported masses can also differ between sources because peptide preparations may include counterions, residual solvents, or bound water. This variability complicates direct comparison of results across studies and makes the exact identity and grade of a given sample worth verifying. Discussions of the compound should therefore specify the source, salt form, and stated purity where those are known.
Purity is ordinarily reported as a percentage from reverse-phase high-performance liquid chromatography, where the area of the main peak is compared with the total peak area. Identity is confirmed by mass spectrometry, since the measured mass can be checked against the value calculated from the sequence. Some certificates also include amino acid analysis or sequence confirmation by tandem mass spectrometry. A single purity number does not describe the profile of related impurities, so the underlying chromatogram and spectrum usually carry more information than the headline figure.
Material of this kind is sold for laboratory research, and labels typically state that it is not intended for human or veterinary use. In many countries it is not an approved medicine, and sports antidoping rules place it among prohibited non-approved substances. Buyers commonly review a certificate of analysis, an independent test report, and the declared storage conditions. Batch-to-batch variation in purity and in counterion content is possible, and how much that variation affects experimental outcomes remains an open question.
Lyophilized peptide is normally kept at minus twenty degrees Celsius or colder, away from light and moisture. Powder held under those conditions is widely treated as stable for long periods, although published stability studies for this exact sequence are sparse and often come from suppliers rather than independent laboratories. Once dissolved, solutions are generally handled cold and used within a short window, because peptide bonds can hydrolyze over time. Repeated freeze-thaw cycles are usually avoided to limit losses, and exact shelf-life figures depend on the buffer and the concentration involved.
In 1916 Kuo-Ching Li, a Chinese-American engineer, founded Wah Chang Trading Corporation in New York State, but it was based in Albany. He developed it as an international tungsten ore and concentrate trading company, leading the company until his death in 1961. He served as president until 1960 and then board chairman. The U.S. Bureau of Mines established Albany Research Center (ARC) on the former Albany College campus in 1942, focusing on the development of new metallurgical processes. First known as the Northwest Electro-development Facility, the site eventually produced titanium and zirconium, spearheaded by William Justin Kroll whom the bureau hired in 1945. The first zirconium strip was rolled out there in August 1946. In 1951, William Kroll joined the faculty of Oregon State College, ten miles away in Corvallis. The ARC fostered the growth of a new rare metals industry in Albany, led by internationally recognized companies such as the Oregon Metallurgical Company, Oremet, and Wah Chang. In the 1970s, Albany attempted to extend its city limits to include a zirconium processing plant of Wah Chang Corporation in order to increase its industrial tax base. Wah Chang responded in 1974 by sponsoring a vote to incorporate the desired properties as Millersburg. When the Bureau of Mines closed in 1996, the ARC was transferred to the United States Department of Energy's Office of Fossil Energy. In 2005 the facility became part of the National Energy Technology Laboratory.
=== First trial === The case attracted nationwide publicity in the United States. The trial began in February 1982. Evidence presented by the prosecution consisted of circumstantial evidence, imputation of financial motive, extensive testimony by various maids, including Maria Schrallhammer who was a prominent witness at both trials, chauffeurs, doctors, and personal exercise trainers, a black bag with drugs, and a used syringe, reported to contain traces of insulin, found in Claus von Bülow's mansion. There was much evidence of excessive use of sedatives, vitamins, and other drugs by her, including testimony of alcohol and substance abuse problems. Harvard endocrinologist George Cahill testified that he was convinced that her brain damage was the result of injected insulin. Claus von Bülow was convicted.
Steroid hormones are transported through the blood by being bound to carrier proteins—serum proteins that bind them and increase the hormones' solubility in water. Some examples are sex hormone-binding globulin (SHBG), corticosteroid-binding globulin, and albumin. Most studies say that hormones can only affect cells when they are not bound by serum proteins. In order to be active, steroid hormones must free themselves from their blood-solubilizing proteins and either bind to extracellular receptors, or passively cross the cell membrane and bind to nuclear receptors. This idea is known as the free hormone hypothesis. This idea is shown in Figure 1 to the right.
Agouti-related protein (AgRP), also called agouti-related peptide, is a neuropeptide produced in the brain by the AgRP/NPY neuron. It is synthesized in neuropeptide Y (NPY)-containing cell bodies located in the ventromedial part of the arcuate nucleus in the hypothalamus. AgRP is co-expressed with NPY and acts to increase appetite and decrease metabolism and energy expenditure. It is one of the most potent and long-lasting of appetite stimulators. In humans, the agouti-related peptide is encoded by the AGRP gene.
Sources: en.wikipedia.org
wheat germ or reticulocyte extracts) Wheat germ extract contains functional ribosomes. It can be used to translate mRNA outside of a cell. Using purified membrane-bounded organelles Mitochondria and chloroplasts can be isolated from cells while preserving their function. Using purified macromolecular complexes (such as ribosomes) Functional ribosomes have been assembled in vitro. Using purified molecules (such as proteins, DNA, or RNA) Polymerase chain reaction is a method for selective replication of specific DNA and RNA sequences in the test tube. It uses pure isolated enzymes. The action of DNA replication has been analyzed in vitro on a single-molecule basis.
=== Onset and duration === The onset of action of psilocybin taken orally is 0.5 to 0.8 hours (30 to 50 minutes) on average, with a range of 0.1 to 1.5 hours (5 to 90 minutes). Peak psychoactive effects occur at about 1.0 to 2.2 hours (60 to 130 minutes). The time to offset of psilocybin orally is about 6 to 7 hours on average. The duration of action of psilocybin is about 4 to 6 hours (range 3–12 hours) orally. A small dose of 1 mg by intravenous injection had a duration of 15 to 30 minutes. In another study, 2 mg psilocybin by intravenous injection given over 60 seconds had an immediate onset, reached a sustained peak after 4 minutes, and subsided completely after 45 to 60 minutes.
Agrobacterium tumefaciens overwinters in infested soils. Agrobacterium species live predominantly saprophytic lifestyles, so its common even for plant-parasitic species of this genus to survive in the soil for lengthy periods of time, even without host plant presence. When there is a host plant present, however, the bacteria enter the plant tissue via recent wounds or natural openings of roots or stems near the ground. These wounds may be caused by cultural practices, grafting, insects, etc. Once the bacteria have entered the plant, they occur intercellularly and stimulate surrounding tissue to proliferate due to cell transformation. Agrobacterium performs this control by inserting the plasmid T-DNA into the plant's genome. See above for more details about the process of plasmid DNA insertion into the host genome. Excess growth of the plant tissue leads to gall formation on the stem and roots. These tumors exert significant pressure on the surrounding plant tissue, which causes this tissue to become crushed and/or distorted. The crushed vessels lead to reduced water flow in the xylem. Young tumors are soft and therefore vulnerable to secondary invasion by insects and saprophytic microorganisms. This secondary invasion causes the breakdown of the peripheral cell layers as well as tumor discoloration due to decay. Breakdown of the soft tissue leads to release of the Agrobacterium tumefaciens into the soil allowing it to restart the disease process with a new host plant.
Sources: en.wikipedia.org
The letters BPC stand for body protection compound. The number 157 refers to a specific fragment designation from early work on gastric proteins. The full name is a label for a synthetic fifteen-amino-acid peptide rather than a naturally isolated drug.
No. The gastric protein is larger, while BPC-157 is a short fragment sequence. The peptide is produced synthetically for research use. The relationship is one of sequence origin, not chemical identity.
It is most often supplied as a lyophilized powder, frequently as the acetate salt. The powder is reconstituted with water or a buffer before use. Free-base and other salt forms also exist but are less common in catalogs.
The dry powder is the stable form and the dissolved form is comparatively fragile. Freezing a solution slows degradation but does not stop it, and repeated freezing and thawing adds further stress. Many laboratories therefore prepare small single-use portions rather than storing one large volume.