The short version of thymalfasin fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-06-25 and is reviewed periodically as new material appears.
The lyophilized peptide is a white to off-white powder that dissolves freely in water and in aqueous buffers near neutral pH. Because the molecule carries a net negative charge under physiological conditions, saline and phosphate solutions are the usual vehicles, while strongly acidic media are avoided. Stock solutions are commonly divided into small aliquots so that repeated freezing and thawing can be limited, since cycling may encourage aggregation. Solubility in organic solvents is poor and those solvents are seldom used as primary diluents.
Recommended storage for the dry powder is a freezer near minus twenty degrees Celsius, kept desiccated and away from light. Once dissolved, the peptide is less stable and is usually held at two to eight degrees Celsius for short intervals or frozen for longer storage. Stability studies focus on the acetylated terminus and the disulfide linkage because those features define the intact molecule. Common degradation routes include cysteine oxidation, deamidation of asparagine or glutamine side chains, and slow formation of higher-molecular-weight species.
Storage recommendations center on low temperature, dryness, and protection from repeated freezing and thawing. The intact powder is commonly held at 20 degrees below zero Celsius or colder, while a working solution is divided into single-use aliquots to limit freeze-thaw cycles. Buffered saline or phosphate-buffered saline at neutral pH is frequently used as a diluent. Light sensitivity is not well documented, yet amber vials or foil wrapping are common practice for long-term storage of peptide stocks.
Identity and purity are assessed with a small set of standard peptide methods. Reversed-phase high-performance liquid chromatography separates the main peak from truncated or oxidized species, and its area percentage is the usual purity measure. Mass spectrometry confirms the observed molecular mass against the expected value, while amino acid analysis or peptide mapping checks composition and sequence. Specifications for research-grade material are often stated as 95 percent or higher, though the exact limit depends on the supplier and the intended use.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Assessed by visual inspection at release |
| Solubility class | Freely soluble in water | Aqueous buffers near neutral pH |
| Typical storage temperature | Minus 20 degrees Celsius | Lyophilized, desiccated, protected from light |
| Typical analytical method | Reverse-phase HPLC with mass spectrometry | Used together for purity and identity |
| Common synonyms | T-alpha-1; thymalfasin | Older reports use several designations |
Thymosin alpha-1 is supplied as a lyophilized powder in most research settings. The solid dissolves readily in water and in common aqueous buffers, and it is typically reconstituted shortly before use. Solutions are clear and colourless at ordinary working concentrations. Because the peptide is hygroscopic, weighing and reconstitution are usually performed with minimal exposure to ambient air. Aliquots are prepared to avoid repeated freeze-thaw cycles, and working solutions are kept cold.
Long-term storage is generally at minus twenty degrees Celsius or colder, preferably desiccated and protected from light. Lyophilized material is more stable than reconstituted solution, which degrades faster at room temperature. Stability depends on pH, ionic strength, and the presence of oxidising agents. Published stability data for the peptide are limited, so storage claims in catalogues should be treated as general guidance rather than measured guarantees. Freeze-thaw cycles are kept to a minimum.
Identity and purity are normally confirmed by reversed-phase high-performance liquid chromatography and mass spectrometry. The expected mass for the acetylated 28-residue peptide is close to 3108 daltons, and a mass shift indicates a modification or truncation. Peptide mapping after enzymatic digestion can resolve sequence-level questions. Counter-ion content, water content, and residual solvents are separate quality attributes that a certificate of analysis may or may not report. Aggregation is monitored by size-exclusion chromatography when relevant.
The name itself causes confusion, because several unrelated thymic peptides share the thymosin label. Thymosin beta-4, for example, is a different molecule with different functions. Naming conventions in the literature also mix descriptive research terms with assigned nonproprietary names, so a reader should confirm which entity a given paper addresses. Clarifying that point is usually the first step in interpreting any claim about this peptide.
Thymosin alpha-1 is a short peptide of 28 amino acid residues first described in the 1970s as a component of thymic extracts. Its N-terminal residue carries an acetyl group, and the sequence is highly conserved across mammalian species. The peptide is not encoded as a standalone gene product; it is released by proteolytic cleavage from the N-terminus of prothymosin alpha, a larger acidic nuclear protein. That precursor relationship places it within a broader family of thymic and immune-associated peptides that have been studied for decades.
The activity of this peptide is generally described as immunomodulatory rather than directly antimicrobial. Experimental work links it to signaling through certain Toll-like receptors on dendritic cells and to downstream maturation of antigen-presenting cells. Reported effects include expansion of T cell subsets, shifts in cytokine profiles, and increased natural killer cell activity. These observations come largely from cell culture and animal models, and the precise receptor-level events in humans remain incompletely characterized.
Clinical endpoints or clinical outcomes are outcome measures referring to occurrence of disease, symptom, sign or laboratory abnormality constituting a target outcome in clinical research trials. The term may also refer to any disease or sign that strongly motivates withdrawal of an individual or entity from the trial, then often termed a humane (clinical) endpoint. The primary endpoint of a clinical trial is the endpoint for which the trial is powered. Secondary endpoints are additional endpoints, preferably also pre-specified, for which the trial may not be powered. Surrogate endpoints are trial endpoints that have outcomes that substitute for a clinical endpoint, often because studying the clinical endpoint is difficult, for example using an increase in blood pressure as a surrogate for death by cardiovascular disease, where strong evidence of a causal link exists.
== Gene == The POMC gene is located on chromosome 2p23.3. This gene encodes a 285-amino acid polypeptide hormone precursor that undergoes extensive, tissue-specific, post-translational processing via cleavage by subtilisin-like enzymes known as prohormone convertases.
Multiple theories were proposed for why earlier research was able to produce Form 2 from "pure" ingredients, ranging from the possibility that the early researchers were unintentionally working with impure materials to the possibility that seed crystals of Form 1 had become more common in the atmosphere of laboratories since the 1970s.
=== Mutagens === One of the most common base analogs is 5-bromouracil (5BU), the abnormal base found in the mutagenic nucleotide analog BrdU. When a nucleotide containing 5-bromouracil is incorporated into the DNA, it is most likely to pair with adenine; however, it can spontaneously shift into another isomer which pairs with a different nucleobase, guanine. If this happens during DNA replication, a guanine will be inserted as the opposite base analog, and in the next DNA replication, that guanine will pair with a cytosine. This results in a change in one base pair of DNA, specifically a transition mutation. Additionally, nitrous acid (HNO2) is a potent mutagen that acts on replicating and non-replicating DNA. It can cause deamination of the amino groups of adenine, guanine and cytosine. Adenine is deaminated to hypoxanthine, which base pairs to cytosine instead of thymine. Cytosine is deaminated to uracil, which base pairs with adenine instead of guanine. Deamination of guanine is not mutagenic. Nitrous acid-induced mutations also are induced to mutate back to wild-type.
Sources: en.wikipedia.org
=== Cured meat and cheese industries === The bacteria L. lactis is the primary bacteria responsible for the ripening of cheeses, and the enzymes within the bacteria play key roles in the development of flavor, texture, and aroma profiles. The branched-chain amino acid aminotransferases help to produce compounds like isovaleric acid, isobutyric acid, 2- and 3-methylbutan(al)(ol) and 2-methylpropan(al)(ol) that impart fruity or malty aromas depending on the amount of compound present. Along with the aromatic aminotransferases (AraT), BCATs in L. lactis help develop the aroma/flavor resulting from volatile sulphur compounds produced during fermentation. The bacteria Staphylococcus carnosus and Enterococcus faecalis are often used in tandem with other lactic acid bacterium to begin the meat fermentation process. BCATs in these two bacteria perform transaminations during meat fermentation, producing the corresponding α-ketoacids from amino acids. As fermentation proceeds, these α-ketoacids degrade into a class of compounds known as methyl-branched volatiles that include aldehydes, alcohols, and carboxylic acids, all of which contribute to the distinct scents and flavors of cured meats.
== Pathophysiology == Coronary occlusion is caused by plaque inside of the blood vessels that direct oxygen rich blood to the heart. Plaque is caused by fatty deposits and scar tissue that cling to the walls of coronary arteries. The development of plaque takes years and leads to stenosis of the coronary arteries and progressively reduces blood flow. Due to the slower development of this condition, the body will adapt and create small blood vessels that circumvent the blockage. The small blood vessels form a natural bypass of the blockage, but often do not supply enough blood to meet an increased demand when stressors are applied like exercise. When a plaque has a greater than 50% diameter stenosis, the reduced blood flow through the coronary artery during exertion may lead to angina. Acute coronary events occur when a thrombus forms due to disruption of a plaque. In acute heart attack, occlusion is greater than in unstable angina, where arterial occlusion is not full blockage. Downstream embolism of thrombus may also produce microinfarcts.
N-methylimidazole is slightly more basic than imidazole but is otherwise similar, if more lipophilic. Many salts of [M(imidazole-1-R)6]2+ are known (R = alkyl, vinyl, etc.). 2-Methylimidazoles are somewhat bulky ligands owing to the steric clash between the 2-methyl group and other ligands in octahedral complexes. A modified benzimidazole ligand is found in all versions of vitamin B12.
Sources: en.wikipedia.org
Keratolytic () therapy is a type of medical treatment to remove warts, calluses and other lesions in which the epidermis produces excess skin. In this therapy, acidic topical medicines, such as Whitfield's ointment or Jessner's solution, are applied to the lesion in order to thin the skin on and around it. This therapy causes the outer layer of the skin to loosen and shed. Keratolytics can also be used to soften keratin, a major component of the skin. This serves to improve the skin's moisture binding capacity, which is beneficial in the treatment of dry skin. Such agents (keratolytics) include alkalis (by swelling and hydrolysis of skin), salicylic acid, urea, lactic acid, allantoin, glycolic acid, and trichloroacetic acid. While cytostatic agents such as zinc pyrithione are first line, keratolytics (salicylic acid and sulfur) can also be used in the treatment of dandruff and seborrheic dermatitis. Sulfur and salicylic acid can also be used to effectively treat acne and cradle cap in some patients. Resorcinol is another keratolytic that is usually combined with sulfur. Urea acts as a keratolytic due to its hygroscopic property.
However, it was found that the timers controlling the broadcasts could drift and the broadcasts from one station would begin to be seen at others, a phenomenon known as "running rabbits". To avoid this, power from the National Grid was used to provide a convenient phase-locked 50 Hz signal that was available across the entire nation. Each CH station was equipped with a phase-shifting transformer that triggered it at a different point on the grid waveform. The output of the transformer was fed to a Dippy oscillator that produced sharp pulses at 25 Hz, phase-locked to the output from the transformer. The locking was "soft", so short-term variations in the phase or frequency of the grid were filtered out. During times of strong ionospheric reflection, especially at night, it was possible that the receiver would see reflections from the ground after one reflection. To address this problem, the system was later provided with a second pulse repetition frequency at 12.5 pps, which meant that a reflection would have to be from further than 6,000 miles (9,700 km) away before it would be seen during the next reception period.
=== Jewish === Ahavas Israel - Founded in New York in 1890. Paid sick and death benefits for members and their wives. The emblem was a pair of clasped hands. Founders included Masons, Oddfellows, members of the Sons of Benjamin and the Independent Order of B'rith Abraham. American Star Order - Founded in New York in 1884, this was an order for Romanian American Jews and their wives. In 1899 had 5,500 members, half of which were female. Paid sickness and death benefits. Motto: "Charity, Harmony, and Brotherly Love". The emblem was a five-pointed star containing three Hebrew letters with the Roman numeral XIII below and the letter G above. B'nai Zion - also known as the Order of the Sons of Zion, B'nai Zion was founded in 1908 as the first explicitly Zionist fraternal order. Membership open to non-Jews since at least 1979. Had a benefit membership of 3,619 in 57 lodges in 1923. Had 24,000 members in the late 1960s, 40,000 in 115 chapters in 1979. 34,000 members in 1989. Headquarters in 1923 at 44 E. 23rd Street, New York City. Current headquarters at 136 East 39th Street. Licensed to sell insurance in 11 states, benefits include hospitalization and medical policies and retirement plans. Zionist work through B'nai Zion Foundation: sells Israel Bonds, sponsored Kfar B'nau Zion agricultural settlement with 500 members, an artist colony near Haifa, school of applied arts and hostel for art students, also built home for mentally challenged children in Israel.
Sources: en.wikipedia.org
Reconstituted solutions are typically kept refrigerated at two to eight degrees Celsius when used within a short window, or frozen in aliquots for longer periods. Repeated freeze-thaw cycles are avoided because they can reduce recovery of intact peptide.
It establishes that the measured mass matches the expected value for the intact molecule. It also helps detect modifications such as oxidation or truncation that shift the mass by a known amount.
Cycling between frozen and liquid states can promote aggregation and adsorption to container walls. Dividing a stock into single-use aliquots limits the number of cycles a given vial undergoes.
Aliquots are typically frozen well below zero Celsius and thawed only once, since repeated cycles promote aggregation and loss. Dilution into a neutral buffer limits degradation during short working periods, and prolonged storage at room temperature is avoided.