胸腺素α1 comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-01-18. Where a claim depends on a specific study, the study is described rather than over-claimed.
Stability depends on temperature, pH, and the number of freeze-thaw events the sample has experienced. Freeze-dried material is commonly held at -20 °C or colder, while reconstituted liquid is kept cold and used within a short window. Extreme pH and prolonged light exposure can promote deamidation, oxidation, or aggregation, particularly at asparagine and methionine positions. Adsorption to container walls can lower the measured concentration of a dilute solution even when the peptide molecules themselves remain intact.
Identity and purity are usually assessed by reversed-phase high-performance liquid chromatography, which separates the target peptide from truncated or chemically modified byproducts. Mass spectrometry confirms the expected molecular mass and can indicate acetylation state or sequence errors. Amino acid analysis and peptide mapping supply complementary sequence-level information, while endotoxin testing is relevant for preparations intended for cell or animal work. Purity figures reported by suppliers refer to the method used and are not directly comparable across laboratories unless conditions are stated.
Quantifying thymosin alpha-1 in a sample usually relies on reverse-phase high-performance liquid chromatography. The peptide lacks strong chromophores, so detection often occurs at 214 nm, where the peptide backbone absorbs. Mass spectrometry provides confirmatory identification and can detect sequence variants or truncations. Immunoassays have been used in biological matrices, but they may cross-react with related fragments. For purity assessment, chromatographic peak area gives the main component percentage, while mass accuracy verifies molecular identity.
The lyophilized peptide is generally stable for extended periods when kept cold and dry. Once dissolved, aqueous solutions are less stable; hydrolysis, oxidation, and aggregation can degrade the material. Storage at -20 °C or lower slows these processes. Repeated freeze-thaw cycles are best avoided because they can promote aggregation. The exact shelf life depends on formulation, pH, and concentration, so stability studies are typically performed for each specific product.
Quality control for thymosin alpha-1 focuses on identity, purity, and potency. Identity is confirmed by mass spectrometry and amino acid analysis, while purity is assessed by chromatography with limits on related substances and residual solvents. Potency assays may use cell-based immune readouts, but these are not standardized across laboratories. Regulatory status differs by jurisdiction; no product is approved in the United States for clinical use, whereas some other countries register injectable forms for specific indications.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white lyophilized powder | Visual description varies by batch |
| Solubility | Freely soluble in water | Aqueous buffers are commonly used |
| Typical storage temperature | -20 °C or below for powder | Reconstituted liquid kept at 2-8 °C short term |
| Purity method | Reversed-phase HPLC | Value derived from peak area integration |
| Identity method | Mass spectrometry | Confirms mass and sequence integrity |
胸腺素α1（thymosin alpha 1，Tα1）是一种由28个氨基酸组成的酸性肽，N端被乙酰化，分子量约为3108道尔顿。该肽最早从牛胸腺组织提取物中分离，属于胸腺素组分5的一个成分。其序列在不同哺乳动物中高度保守，提示其具有基本的生物学功能。名称中的“α1”指其在电泳中的迁移位置，并非表示亚型编号。它既存在于胸腺，也存在于脾脏和淋巴结等免疫组织。
20世纪70年代，研究者从胸腺提取物中纯化出多种小肽，Tα1是其中被较早表征的一种。最初的制备依赖组织匀浆和层析步骤，产量低且成分复杂。随着固相肽合成技术成熟，实验室和工业界能够生产与天然序列一致的合成版本。合成肽的纯度可达95%以上，并可通过反相高效液相色谱和质谱进行鉴定。这一转变使研究不再依赖动物胸腺来源。
市售的胸腺素α1通常以冻干粉形式提供，溶解后用于注射。其氨基酸组成包括多个酸性残基，因此在中性pH下带负电荷。该肽可溶于水和生理盐水，但在有机溶剂中溶解度有限。储存条件通常为冻干状态下负20摄氏度，溶解后需冷藏并避免反复冻融。常见的同义词包括胸腺肽α1、thymalfasin和Tα1。
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography, which separates the peptide from closely related impurities and from truncated or oxidized variants. Mass spectrometry supplies the molecular mass and confirms the expected sequence length, while amino acid analysis can be used to check composition. Because the molecule has no chromophore beyond the peptide backbone, ultraviolet detection is typically performed at a low wavelength, where baseline interference from solvents and buffers is a practical concern. Water content and counter-ion content are often reported alongside purity.
Practical handling focuses on limiting adsorption and contamination. The peptide dissolves readily in water, and dilute solutions tend to adhere to plastic and glass surfaces, so an inert carrier protein or a defined buffer can reduce losses in laboratory work. Workers also record the counter-ion form, since an acetate or trifluoroacetate salt changes the mass balance of the weighed powder. Documentation of lot number, purity value, and storage history supports reproducibility when results from different laboratories are compared.
Globally, about 2 percent of soybean meal is used for soy flour and other products for human consumption. Soy flour is used to make some soy milks and textured vegetable protein products, and is marketed as full-fat, low-fat, defatted, and lecithinated types.
She eventually succeeded in purifying components of the coat that were not clathrin and are now known as adaptor proteins. These proteins sit between clathrin, which forms the vesicle's outer shell and also the vesicle membrane. Continuing, Margaret discovered that there were two different populations of clathrin-coated vesicles, one that uses AP-2 at the plasma membrane and one that uses AP-1 and was associated with intracellular membranes. AP-1 and AP-2 are both heterotetramers with related subunits. They both have two large subunits and the other subunit is closely related in AP-1 and AP-2.
Glycogen storage disease type II (GSD-II), also called Pompe disease, and formerly known as GSD-IIa or Limb–girdle muscular dystrophy 2V, is an autosomal recessive metabolic disorder which damages muscle and nerve cells throughout the body. It is caused by an accumulation of glycogen in the lysosome due to a deficiency of the lysosomal acid alpha-glucosidase enzyme (GAA). The inability to break down glycogen within the lysosomes of cells leads to progressive muscle weakness throughout the body and affects various body tissues, particularly in the heart, skeletal muscles, liver, and the nervous system. GSD-II and Danon disease are the only glycogen storage diseases characterised by a defect in lysosomal metabolism. It was first identified in 1932 by Dutch pathologist Joannes Cassianus Pompe, making it the first glycogen storage disease to be discovered.
Sources: en.wikipedia.org
=== Structural relationships === Much reference has been made in the literature (both lay and professional) of the structural kinship of synephrine with ephedrine, or with phenylephrine, often with the implication that the perceived similarities in structure should result in similarities in pharmacological properties. However, from a chemical perspective, synephrine is also related to a very large number of other drugs whose structures are based on the phenethylamine skeleton, and although some properties are common, others are not, making unqualified comparisons and generalizations inappropriate. Thus, replacement of the N-methyl group in synephrine with a hydrogen atom gives octopamine; replacement of the β-hydroxy group in synephrine by a H atom gives N-methyltyramine; replacement of the synephrine phenolic 4-OH group by a –H gives halostachine. If the synephrine phenolic 4-OH group is shifted to the meta-, or 3-position on the benzene ring, the compound known as phenylephrine (or m-synephrine, or "Neo-synephrine") results; if the same group is shifted to the ortho-, or 2-position on the ring, o-synephrine results. Addition of another phenolic –OH group to the 3-position of the benzene ring produces the neurotransmitter epinephrine; addition of a methyl group to the α-position in the side-chain of synephrine gives oxilofrine (methylsynephrine). Four stereoisomers (two pairs of enantiomers) are possible for this substance.
Also in the year 1808, at the conclusion of the Spanish reconquest of Santo Domingo and the repossession of the Eastern half of Hispaniola by Spain, the Governor General of Cuba sent all of the recent arrived refugees back to that colony. In so doing, these immigrants then dismantled their two Lodges they had been operating, Concordia and Perseverancia, and left the island. Many of these refugees moved to New Orleans, Louisiana District by 1809, and the next year, established the Concorde Lodge, No. 117, chartered under the Grand Lodge of Pennsylvania. Later in 1810, with three other Lodges in New Orleans, they established the Grand Lodge of Louisiana. Perseverancia was also reorganized in New Orleans under the name Perseverance Lodge No. 118. The only one of these Lodges that remained in Cuba was the Temple of the Theologic Virtues, and it also changed its name to Spanish; Templo de las Virtudes Teologales. The French members mostly having left the island, the remaining members were mostly Creole.
Establishing SIUT, Sukkur, was an innovative response to the need of the people of Sindh was planned in the year 2009. Rizvi anticipates the needs of his patients and responds accordingly. To make dialysis accessible, he conceptualized a network of satellite centers in various parts of Pakistan to save patients the trouble of commuting from far-flung areas of Sindh, southern parts of Punjab and Baluchistan to go for this procedure twice a week as far as Karachi. On 2 February 2012 Adibul Hasan Rizvi, Director Sindh Institute of Urology and Transplantation, along with a team of doctors and paramedical staff inaugurated SIUT-Chablani Medical Center Sukkur. Initially as a day care Dialysis Center with 16 Haemodialysis machines and OPD, which shall facilitate a large number of underprivileged patients of Upper Sindh, Lower Punjab & Baluchistan.
Sources: en.wikipedia.org
Hong Kong is represented in the National People's Congress by 36 deputies chosen through an electoral college and 203 delegates in the National Committee of the Chinese People's Political Consultative Conference appointed by the central government.
==== Absorption ==== 2C-B appears to have relatively low oral bioavailability. The time to peak levels is 2.0 to 2.4 hours. Peak levels of 2C-B have been reported to be 2.5 ng/mL with 10 mg orally, 3.3 to 4.6 ng/mL with 20 mg orally, and 5.4 to 6.4 ng/mL with 30 mg orally. The peak levels of 2C-B metabolites have also been described.
When the mixed sulfates were pure enough, they were once more converted to mixed chlorides; barium and radium thereafter were separated by fractional crystallisation while monitoring the progress using a spectroscope (radium gives characteristic red lines in contrast to the green barium lines), and the electroscope. After the isolation of radium by Marie and Pierre Curie from uranium ore from Jáchymov, several scientists started to isolate radium in small quantities. Later, small companies purchased mine tailings from Jáchymov mines and started isolating radium. In 1904, the Austrian government nationalised the mines and stopped exporting raw ore. Until 1912, when radium production increased, radium availability was low. The formation of an Austrian monopoly and the strong urge of other countries to have access to radium led to a worldwide search for uranium ores. The United States took over as leading producer in the early 1910s, producing 70 g total from 1913 to 1920 in Pittsburgh alone. The Curies' process was still used for industrial radium extraction in 1940, but mixed bromides were then used for the fractionation. If the barium content of the uranium ore is not high enough, additional barium can be added to carry the radium. These processes were applied to high grade uranium ores but may not have worked well with low grade ores. Small amounts of radium were still extracted from uranium ore by this method of mixed precipitation and ion exchange as late as the 1990s, but as of 2011, it is extracted only from spent nuclear fuel.
== Awards and honors == 1936 – Became a member of the United States National Academy of Sciences 1939–1941 – President of the American Society of Biological Chemists 1945–1946 – President of the American Institute of Nutrition 1949 – Osborne and Mendel Award of the American Institute of Nutrition 1952 – Honorary Doctor of Sciences Degree from the University of Illinois 1952 – Willard Gibbs Medal of the American Chemical Society 1957 – Kenneth A. Spencer award of the American Chemical Society 1961 – Twentieth Anniversary Award of the Nutrition Foundation 1966 – Received National Medal of Science 1979 – William C. Rose Award initiated
Sources: en.wikipedia.org
Cold storage slows the chemical degradation reactions that occur in solution. Lyophilized powder is more stable than reconstituted liquid and tolerates longer storage periods. Repeated temperature cycling should still be avoided because it can drive aggregation and loss of material.
Mass spectrometry is the standard confirmation of molecular mass and acetylation state. Chromatography establishes purity but does not identify the molecule on its own. The two techniques are normally applied together during verification.
No, because the reported value reflects the detection method and wavelength used, which vary between laboratories. A number stated without method details cannot be compared directly with another supplier's figure. Requesting the chromatogram and the method conditions is a common way to interpret it.
Reverse-phase HPLC with ultraviolet detection at 214 nm is common. Mass spectrometry is used to confirm molecular identity and detect modifications. Immunoassays exist but may not distinguish the intact peptide from fragments.