lyophilized powder 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.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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。
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。
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.
| Property | Value | Notes |
|---|---|---|
| 化学分类 | 线性肽 | 由28个氨基酸组成 |
| 分子量 | 约3108 Da | 合成版本一致 |
| 外观 | 白色至类白色粉末 | 冻干品 |
| 溶解度 | 易溶于水 | 微溶于有机溶剂 |
| 储存温度 | -20°C（冻干） | 溶解后2-8°C |
Thymosin alpha-1 is a 28-residue peptide first isolated from thymus tissue in the 1970s. It corresponds to the N-terminal portion of thymosin beta-4, from which it is cleaved in vivo. The peptide carries an acetyl group at its N-terminus, a modification that affects its charge and stability. Synthetic material produced by solid-phase peptide synthesis is chemically identical to the natural fragment and is the form used in research and clinical studies.
Laboratory work indicates that the peptide acts on cells of both the innate and adaptive immune systems. Reported effects include signalling through Toll-like receptors on dendritic cells, enhanced T-cell maturation, and increased natural killer cell activity. These actions are described largely from cell-culture and animal experiments, and the precise receptor-level events remain incompletely defined. Studies in humans have generally measured immune markers rather than a single defined molecular target. The resulting picture remains partly descriptive.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Results across trials have been mixed, and several studies were small or conducted under differing protocols. Regulatory status varies by country, and the compound is not approved in every jurisdiction where it is studied. Evidence for any single indication should be read with attention to sample size and endpoint choice.
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.
Overall evidence quality varies considerably. A large share of published reports come from single centers, rely on surrogate immunological markers, or lack adequate control groups. Systematic reviews have highlighted this heterogeneity as a barrier to pooling results. Open questions include which patients, if any, might benefit, what treatment duration is appropriate, and whether any effect is independent of standard care. The peptide is often described as an immune modulator rather than a therapy for one disease, which complicates confirmatory trial design.
Thymosin alpha 1 was identified in 1977 as a component of thymosin fraction 5, a heterogeneous preparation used in early studies of thymic function. Investigators purified the active material and determined its amino acid sequence, which enabled chemical synthesis. Work in the following decades concentrated on T-cell maturation and immune reconstitution in animals and small human cohorts. Early preparations varied in composition, so results from that period are difficult to compare with studies using defined synthetic peptide.
Clinical research has examined the peptide in chronic hepatitis B and C, as a vaccine adjuvant, and in sepsis and oncology settings. Findings across trials are mixed; some report changes in selected immune markers, while others find no clear clinical benefit. Many studies are small and define outcomes differently, which limits comparison. Regulatory approval is confined to a few countries, and the compound is not an approved drug in the United States or most of Europe.
== Contamination incidents == The company has been involved in several controversial incidents of proven and alleged corporate crimes, including exposing workers and residents of an entire town to asbestos contamination in Libby and Troy, Montana, water contamination (the basis of the book and film A Civil Action) in Woburn, Massachusetts, and an Acton, Massachusetts, Superfund site.
=== September === 17 September – President Lula signs a decree to increase the benefits of the Bolsa Familia program by 15%. 20 September – The Superior Electoral Court rejects a petition to extend voting time amidst Simchat Torah, which falls on 4 October, the day of the nation's first round of elections. 21 September – A helicopter crashes in Santa Catarina, killing all five people on board including singer Rick Sollo. 25 September – President Lula issues a provisional order banning online gambling and sports betting.
== Selected publications == Carsten Grashoff; Brenton D Hoffman; Michael D Brenner; Ruobo Zhou; Parsons, Maddy; Michael T Yang; Mark A McLean; Sligar, Stephen; Chen, Christopher; Taekjip Ha; Martin A Schwartz (2010). "Measuring mechanical tension across vinculin reveals regulation of focal adhesion dynamics". Nature. 466 (7303): 263–266. Bibcode:2010Natur.466..263G. doi:10.1038/nature09198. PMC 2901888. PMID 20613844. Wikidata Q29615714. Caswell, Patrick; Heather J Spence; Parsons, Maddy; White, Dominic; Katherine Clark; Kwai Wa Cheng; Mills, Gordon; Humphries, Martin James; Anthea J Messent; Anderson, Kurt; Mary W McCaffrey; Bradford W Ozanne; Norman, Jim (2007). "Rab25 associates with alpha5beta1 integrin to promote invasive migration in 3D microenvironments". Developmental Cell. 13 (4): 496–510. doi:10.1016/j.devcel.2007.08.012. PMID 17925226. Wikidata Q24296948. I A Akers; M Parsons; M R Hill; M D Hollenberg; S Sanjar; G J Laurent; McAnulty, Robin (2000). "Mast cell tryptase stimulates human lung fibroblast proliferation via protease-activated receptor-2". American Journal of Physiology - Lung Cellular and Molecular Physiology. 278 (1): L193-201. doi:10.1152/ajplung.2000.278.1.l193. PMID 10645907. Wikidata Q73382005.
Sources: en.wikipedia.org
=== Mycolic acid analysis === Mycolic acid analysis has been an evolving field of study for gas-liquid chromatography, as it offers a solution to slow growth rates in Mycobacterium. Mycolic acid is a fatty acid found in the disease tuberculosis, offering a chemical target for diagnosticians to look for.
Thus from the autumn of 2007, the political debate began to focus on the "slowdown", as the government called the economic crisis, and it became the central theme of the March 2008 general election campaign.
== Discovery == Identified as a marker of epithelial differentiation upon its discovery in the 1990s, galectin-7 was first characterized for its increased expression in keratinocytes following UVB irradiation. Only later was its dual role in cancers recognized.
Sources: en.wikipedia.org
==== Other forms ==== Chitosan can be directly applied to the wound as a hemostatic agent, in granule and powder forms. They are typically salts made from mixing chitosan with an organic acid (such as succinic or lactic acid). One example is Celox granules, US approved 2006. WoundStat (FDA approved, date unknown) is a granule consisting of chitosan within silica (smectite) and polyacrylic acid. It is a combination of different topical hemostatics, mineral and organic.
== Sources == This article incorporates text from a free content work. Licensed under CC BY 4.0 (license statement/permission). Text taken from The State of Agricultural Commodity Markets 2026, Food and Agriculture Organization of the United Nations. This article incorporates text from a free content work. Licensed under CC BY-SA 3.0 (license statement/permission). Text taken from The status of women in agrifood systems – Overview, FAO. This article incorporates text from a free content work. Licensed under CC BY-SA 3.0 (license statement/permission). Text taken from The State of Food and Agriculture 2021. Making agrifood systems more resilient to shocks and stresses, In brief, FAO. This article incorporates text from a free content work. Licensed under CC BY-SA 3.0 (license statement/permission). Text taken from Robust transport networks support agrifood systems' resilience, FAO, FAO. This article incorporates text from a free content work. Licensed under CC BY-SA 3.0 (license statement/permission). Text taken from Ensuring economic access to healthy diets during times of crisis, FAO, FAO. This article incorporates text from a free content work. Licensed under CC BY-SA 3.0 (license statement/permission). Text taken from International trade and the resilience of national agrifood systems, FAO, FAO. This article incorporates text from a free content work. Licensed under CC BY-SA 3.0 (license statement/permission). Text taken from The State of Food Security and Nutrition in the World 2021.
Museums from across the United States significantly expanded their programs aimed at children, including K-12 students, during the 2000s and 2010s, according to the American Alliance of Museums and the Institute of Museum and Library Services.
== Database finalization and extraction == Once all expected data is accounted for, all data queries closed, all external data received and reconciled and all other data management activities complete the database may be finalized. Typical reports generated and used by the clinical data manager includes:
Sources: en.wikipedia.org
它不是经典的内分泌激素，而是一种免疫调节肽。其作用主要通过局部免疫细胞间的信号传递实现，而非经血液循环作用于远隔器官。
天然胸腺素α1主要从胸腺组织提取，也可在脾脏和淋巴结中检出。目前研究和临床使用的多为化学合成版本，不再依赖动物组织。
胸腺素组分5是牛胸腺提取物的粗组分，包含多种肽。胸腺素α1是其中一种被纯化和表征的单一肽，具有明确的28个氨基酸序列。
Lyophilized powder is normally kept at minus twenty degrees Celsius or below, in a sealed container, desiccated and away from light. Reconstituted solutions are less stable and are usually refrigerated and used quickly. Repeated temperature cycling should be avoided.