If you have been reading about lyophilization and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-07-21. Where a claim depends on a specific study, the study is described rather than over-claimed.
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。
Identity and purity are normally assessed by reversed-phase high-performance liquid chromatography, which separates the peptide from related impurities and truncation products. Mass spectrometry confirms molecular mass and detects modifications such as deamidation or oxidation. Amino acid analysis and peptide mapping provide additional sequence-level confirmation. For research material, a certificate of analysis typically reports these results together with water content and counter-ion identity, since the lyophilized powder is often supplied as an acetate or trifluoroacetate salt.
Several factors accelerate degradation: alkaline pH, elevated temperature, exposure to oxidants, and the presence of residual moisture. Deamidation of asparagine residues and oxidation of methionine are the most commonly reported degradation routes. Because the peptide lacks disulfide bonds, it does not undergo the thiol-related aggregation seen in some other biologics, but physical aggregation can still occur at high concentration. Stability data are product-specific, and extrapolating shelf life between formulations is not reliable.
| 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 |
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.
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.
Laboratory supplies of the peptide usually arrive as a lyophilized powder in sealed vials. The powder is hygroscopic, so a vial should be allowed to reach room temperature before it is opened to prevent condensation on the contents. Weighing and transfer are best performed in a low-humidity environment with clean tools. Once dissolved, the solution should be mixed gently rather than vortexed, because foaming and shear can reduce recovery of the peptide.
== Research == Breastfeeding research continues to assess prevalence, HIV transmission, pharmacology, costs, benefits, immunology, contraindications, and comparisons to synthetic breast milk substitutes. Factors related to the mental health of the nursing mother in the perinatal period have been studied. While cognitive behavior therapy may be the treatment of choice, medications are sometimes used. The use of therapy rather than medication reduces the infant's exposure to medication that may be transmitted through the milk. In coordination with institutional organisms, researchers are also studying the social impact of breastfeeding throughout history. Accordingly, strategies have been developed to foster the increase of the breastfeeding rates in the different countries.
==== 1996–1997: Appointment and first season ==== In August 1996, Arsenal dismissed Bruce Rioch as club manager. Rioch's position had become untenable after a dispute with the board over transfers, and his working relationship with Dein worsened during the course of his tenure. Arsenal appointed Stewart Houston and later Pat Rice in temporary charge of the first team, while they searched for a full-time successor. Although Barcelona player and manager Johan Cruyff was favourite to take over, the board looked elsewhere, eventually backing Dein's proposal to hire Wenger. The appointment was delayed for several weeks as Wenger was under contract at Nagoya Grampus and the club wanted time to make a final decision. In the meantime, the Arsenal board refused to confirm the identity of their next manager, but speculation grew that it would be Wenger once the club signed French midfielders Patrick Vieira and Rémi Garde. On 22 September 1996, Wenger was unveiled as Arsenal manager, after Nagoya Grampus granted him his release. He officially assumed the role on 1 October 1996, becoming the first Frenchman to manage in the Premier League. At his first press conference, he told reporters: "The main reason for coming is that I love English football, the roots of the game are here. I like the spirit round the game and at Arsenal I like the spirit of the club and its potential."
During the George W. Bush administration, relations between India and the United States blossomed, primarily over common concerns regarding growing Islamic extremism, energy security, and climate change. George W. Bush commented, "India is a great example of democracy. It is very devout, has diverse religious heads, but everyone is comfortable about their religion. The world needs India". Journalist Fareed Zakaria, in his book The Post-American World, described Bush as "being the most pro-Indian president in American history." Similar sentiments are echoed by Rejaul Karim Laskar, a scholar of Indian foreign policy and ideologue of Indian National Congress – the largest constituent of the United Progressive Alliance (UPA). According to Laskar, the UPA rule has seen a "transformation in bilateral ties with the US", as a result of which the relations now covers "a wide range of issues, including high technology, space, education, agriculture, trade, clean energy, counter-terrorism, etc". After the December 2004 tsunami, the US and Indian navies cooperated in search and rescue operations and in the reconstruction of affected areas. Since 2004, Washington and New Delhi have been pursuing a "strategic partnership" that is based on shared values and generally convergent geopolitical interests. Numerous economic, security, and global initiatives, including plans for civilian nuclear cooperation, are underway. First launched in 2005, cooperation on nuclear weapons reversed three decades of American non-proliferation policy.
== Prevention == Eating the chickling pea with legumes having high concentrations of sulphur-based amino acids reduces the risk of lathyrism if such grain is available. Food preparation is also an important factor. Toxic amino acids are readily soluble in water and can be leached. Bacterial (lactic acid) and fungal (tempeh) fermentation is useful to reduce ODAP content. Moist heat (boiling, steaming) denatures protease inhibitors which otherwise add to the toxic effect of raw chickling pea through depletion of protective sulfur amino acids. During drought and famine, water for steeping and fuel for boiling are often also in short supply. Poor people sometimes know how to reduce the chance of developing lathyrism but face a choice between starvation and risking lathyrism.
Sources: en.wikipedia.org
1 December The first draft lottery in the United States since 1942 (and the first in peacetime) was held, and September 14 was the first of the 366 days of the year selected, with Congressman Alexander Pirnie of New York making the first selection.
== History == In 1988, Stark introduced an "Ethics in Patient Referrals" bill concerning physician self-referrals. Some of the ideas in the bill became law as part of the Omnibus Budget Reconciliation Act of 1990. In specific, what is referred to as "Stark I" prohibited a physician referring a Medicare patient to a clinical laboratory if the physician or his/her family member has a financial interest in that laboratory. It was codified in the United States Code, Title 42, Section 1395nn (42 U.S.C. 1395nn, "Limitation on certain physician referrals"). The Omnibus Budget Reconciliation Act of 1993 contained what is known as "Stark II" amendments to the original law. "Stark II" extended the "Stark I" provisions to Medicaid patients and to DHS other than clinical laboratory services. The Centers for Medicare and Medicaid Services has issued rules in the Federal Register to implement Stark Law, including a 2001 "Phase I" final rule, a 2004 "Phase II" interim final rule, and a 2007 "Phase III" final rule.
=== Early puberty === CPA is used as an antiandrogen and antiestrogen to treat precocious puberty in boys and girls. However, it is not fully satisfactory for this indication because it is not able to completely suppress puberty. It does not suppress skeletal maturation enough to avoid a reduction in height at adulthood. For this reason, CPA has mostly been superseded by GnRH agonists in the treatment of precocious puberty. CPA is not satisfactory for gonadotropin-independent precocious puberty. CPA has been used at dosages of 50 to 300 mg/m2 to treat precocious puberty.
== Opioids and receptors == Endomorphins belong to the opioid class of neuropeptides (protein neurotransmitters). Opioids are ligands that bind to opioid receptors and exist both as endogenous substances that are generated within the organism and as synthetic molecules. Endogenous opioids include endorphins, enkephalins, dynorphins, and endomorphins. Transcription and translation of opioid-encoding genes results in the formation of pre-propeptide opioid precursors, which are modified in the endoplasmic reticulum to become propeptide opioid precursors, transferred to the golgi apparatus, and further modified into the opioid product. The exact pre-propeptide precursors of endomorphins have not been identified. Because the precursors have never been identified and the mechanisms by which the endomorphins are produced have never been clarified, the status of endomorphins as endogenous opioid ligands has to be considered tentative. Opioid receptors belong to the G protein-coupled receptor family and include μ, κ, δ, and nociceptinorphanin-FQ receptors. While activation of opioid receptors initiates a diverse array of responses, opioids typically serve as depressants, and are widely used and developed as analgesics. Additionally, opioid malfunction has been linked to schizophrenia and autism. Endomorphins demonstrate high selectivity and affinity for the μ-opioid receptor, which functions in pain relief and intoxication.
Chemical information and Biochemical information. The chemical information in YMDB includes 2,027 metabolite structures with detailed metabolite descriptions, extensive chemical classifications, synthesis information and observed/calculated chemical properties. It also contains nearly 4,000 NMR, GC-MS and LC/MS spectra obtained from more than 500 different metabolites. The biochemical information in YMDB includes >1,100 protein (and DNA) sequences and >900 biochemical reactions. The YMDB supports a wide variety of queries including text searches, chemical structure searches, sequence similarity searches and spectral similarity searches. This makes it particularly useful for metabolomic researchers who are studying yeast as a model organism or who are looking into optimizing the production of fermented beverages (wine, beer). Secondary electrospray ionization-high resolution mass spectrometry SESI-HRMS is a non-invasive analytical technique that allows us to monitor the yeast metabolic activities. SESI-HRMS has found around 300 metabolites in the yeast fermentation process, this suggests that a large number of glucose metabolites are not reported in the literature.
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。
Dry lyophilized powder tolerates short ambient exposure during handling and shipping. Long-term room-temperature storage is not recommended because moisture uptake and slow degradation can occur over months. Storage at minus twenty degrees Celsius is the common practice for extended periods.