The short version of albumin binding fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-06-23 and is reviewed periodically as new material appears.
固体状态的 tirzepatide 通常以冻干粉形式保存，推荐在低温、避光、干燥条件下存放，常见区间为 2 至 8 摄氏度，长期保存可考虑更低温度并避免反复冻融。冻融循环会导致肽链聚集或析出，从而影响后续定量结果。容器密封性与湿度控制同样是稳定性研究中反复强调的因素。
溶解操作一般使用注射用水或适宜的水性缓冲液，必要时加入少量助溶剂以改善溶解速度，但应避免剧烈涡旋振荡，因为剪切力可能促进聚集。配制后的溶液在冷藏条件下的稳定时间通常短于固体形态，具体时限取决于浓度、缓冲体系与容器材质。是否加入防腐成分，则取决于用途是否为多次取样。
The compound first appeared in the scientific literature as an investigational agent for type 2 diabetes. Clinical development proceeded through phase 1, phase 2, and phase 3 programs that measured glycemic control as a primary endpoint while recording body weight as a secondary outcome. Regulatory approval in the United States followed in 2022 for glycemic control, and a separate indication for chronic weight management was added later. Subsequent trials have examined cardiovascular outcomes in adults with elevated cardiovascular risk. Debates continue over how much of the observed effect derives from each receptor arm.
Structural work on the molecule centers on a C20 fatty diacid moiety attached through a linker to the peptide backbone. This side chain promotes reversible binding to serum albumin, which slows renal clearance and supports a prolonged action profile. The peptide backbone incorporates aminoisobutyric acid substitutions that limit recognition by digestive enzymes. Together these modifications produce a molecule that is stable enough for subcutaneous delivery but still dependent on careful manufacturing control. Analytical characterization of the active pharmaceutical ingredient typically follows the conventions used for other synthetic peptides.
Tirzepatide is a synthetic peptide composed of 39 amino acids. It acts as a dual agonist at two incretin receptors, the glucose-dependent insulinotropic polypeptide receptor and the glucagon-like peptide-1 receptor. The molecule was designed by modifying the native sequence of glucose-dependent insulinotropic polypeptide to improve metabolic stability and extend its circulation time. Its structure includes several non-natural amino acid residues and a fatty acid side chain. These features distinguish it from earlier single-receptor incretin analogs studied in the same period.
| Property | Value | Notes |
|---|---|---|
| 储存温度 | 2 至 8 摄氏度 | 固体粉末，避光密封 |
| 外观 | 白色至类白色冻干粉 | 溶解后为澄清至微乳光 |
| 溶解性 | 易溶于水性缓冲液 | 避免剧烈振荡 |
| 常规纯度方法 | 反相高效液相色谱 | 紫外或质谱检测 |
| 定量方法 | 液相色谱串联质谱 | 配合固相萃取前处理 |
Identity and purity are established with reversed-phase high-performance liquid chromatography, often paired with mass spectrometry for confirmation of the expected mass. Peptide mapping after enzymatic digestion verifies the primary sequence and detects substitutions. Size-exclusion chromatography quantifies aggregates and fragments, which are the impurities most often tracked for peptides of this size. Residual solvents, counterions, and water content fall under separate tests described in pharmacopeial chapters. Circular dichroism or nuclear magnetic resonance may be used in research settings to probe secondary structure, though such methods are less common in routine release testing.
Peptide active ingredients of this type are typically supplied as lyophilized powder because the dry form resists hydrolysis during transport. The material is hygroscopic, so vials are usually equilibrated to room temperature before opening to avoid condensation on the solid. Repeated freeze-thaw cycles can promote aggregation and are generally avoided by aliquoting stock into single-use portions. Personnel handling the powder work in controlled environments to limit inhalation of fine particles. Written procedures usually specify these steps rather than leaving them to individual judgment.
Clinical development proceeded through large phase 3 programmes in type 2 diabetes and in obesity or overweight with at least one weight-related comorbidity. Regulatory approvals followed in several jurisdictions for both indications. Weekly subcutaneous dosing reflects an elimination half-life of roughly five days. Open questions include the durability of metabolic effects after treatment stops, long-term cardiovascular and hepatic outcomes beyond completed trials, and whether the dual mechanism confers benefits independent of total receptor occupancy. Published literature continues to expand on these points. Substantial uncertainty remains about interindividual variability in response.
Tirzepatide is a synthetic linear peptide of 39 amino acids that acts as a dual agonist at the glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1) receptors. Its sequence derives from native GIP but incorporates non-natural residues and a C20 fatty diacid moiety linked to a lysine side chain. The lipophilic chain promotes albumin binding, which slows renal clearance and extends circulation time. The unmodified peptide has a molecular formula of C225H348N48O68 and a molecular mass near 4,813 daltons.
Identity and purity are assessed by reversed-phase high-performance liquid chromatography, with mass confirmation by electrospray ionisation mass spectrometry. Peptide mapping after enzymatic digestion verifies the primary sequence. Size-exclusion chromatography quantifies aggregates, while circular dichroism provides a secondary-structure fingerprint. Bioanalytical quantification in plasma uses immunoassay or LC-MS/MS. Reported purity for research-grade lots is commonly 95 percent or higher, and residual water content is checked by Karl Fischer titration.
As a peptide, tirzepatide is handled as a lyophilised solid in research settings and as a preserved solution in finished products. Aqueous solubility is pH dependent and reaches a minimum near the isoelectric point, which lies close to pH 5.4. Stock solutions are typically prepared in neutral or slightly basic buffer to limit precipitation. The solid is hygroscopic and should be equilibrated to room temperature before opening so that condensation does not form on the powder surface.
Recommended storage for reference material is a freezer at approximately -20 degrees Celsius, protected from light and moisture. Commercial injectable presentations are stored refrigerated between 2 and 8 degrees Celsius and must not be frozen. Product labelling generally permits a limited period at controlled room temperature once dispensed, with the exact window depending on the presentation. Repeated temperature cycling is avoided because it can promote aggregation or deamidation of the peptide chain.
Banting stated that the reporter had betrayed his confidence, but did not retract his statement and reaffirmed that HBC was responsible for the death of indigenous residents by supplying the wrong kind of food and introducing diseases into the Arctic. As A. Y. Jackson notes in his memoir, since neither the governor nor the general manager had been to the Arctic, the meeting ended with them asking Banting's advice on what HBC ought to do: "He gave them some good advice and later he received a card at Christmas with the Governor's best wishes."
=== Forming protein-protein conjugates via Cu-free click chemistry === Studies have explored the strategy of producing protein-protein conjugates with the help of the aldehyde tag. Their aim was to connect full length human IgG (hIgG) to the human growth hormone (hGH). These protein-protein conjugates can be superior to monomeric proteins in terms of serum half life in protein therapeutics and, additionally, have appealing dual binding properties. In order to achieve protein fusion, the five-residue aldehyde tag (CxPxR) was incooperated into hIgG and hGH. In hIgG, the aldehyde tag was introduced at the C termini of the two heavy chains, resulting in two possible conjugation sites. FGE then oxidizes the cysteine residue to formylglycine (fGly) during protein expression. For the subsequent conjugation steps, the strategy of the copper-free click chemistry was selected. A strain-promoted 1,3-dipolar cycloaddition of a cyclooctynes and an azide was carried out forming a covalent linkage (also termed the Cu-free azide-alkyne cycloaddition). Thus, the aldehyde bearing proteins react under oxime formation with different heterobifunctional linkers which carry an aminooxy residue on one end and either an azide or cyclooctynes on the other. This results in the attachment of hIgG to a linker containing a cyclooctyne (here dibenzoazacyclooctyne (DIBAC)) and hGH to a linker holding an azide function (Fig.: 2A and B). The proteins hGH and hIgG were also treated with DIBAC-488, azide Alexa Fluor 647 and analysed by SDS-PAGE and Western blot to validate oxime formation.
It has been shown in mice that in certain conditions neutrophils have a specific type of migration behaviour referred to as neutrophil swarming during which they migrate in a highly coordinated manner and accumulate and cluster to sites of inflammation.
=== Similar phenomena === The use of a suffix in this way is not new. -mandering has long been used as a suffix by a politician's name in analogy with gerrymandering ("Henry-mandering" was used in 1852). In recent years, the -gate suffix as a catch-all signifier for scandal has seen some competition from -ghazi, as in "Ballghazi" instead of "Deflategate", or "Bridgeghazi" instead of "Bridgegate". The use of --ghazi is a play on the investigation into the 2012 Benghazi attack, which, despite numerous official investigations into the possibility of government cover-ups, has resulted in no criminal charges or major repercussions for the individuals supposedly involved. -ghazi may be seen as carrying an ironic or self-effacing connotation in its usage, implying that the event described has the appearance and media coverage of a scandal, but does not actually amount to much in a grander sense. Like the -gate suffix, the Italian -opoli suffix emerged in Italian media from investigations in the 1990s that uncovered a system known as Tangentopoli. The term derives from tangente, which means 'kickback' (e.g., bribery given for public works contracts), and -(o)poli, meaning 'city'. Examples of snowclone-like use of -opoli include Bancopoli (a financial scandal) and Calciopoli (a 2006 Italian football scandal).
Sources: en.wikipedia.org
=== Foundation === The Brazilian Communist Party (in Portuguese, Partido Comunista Brasileiro), abbreviated as the PCB, was founded on 25 March 1922 in the city of Niterói, Rio de Janeiro. On that day, nine representatives of communist groups from the cities of São Paulo, Santos, Cruzeiro, Porto Alegre, Recife, Niterói, Juiz de Fora and Rio de Janeiro met and approved the party's statutes and the twenty-one conditions for entering the Communist International, though the PCB was not recognized by the Comintern in its first years due to its eclectic ideological roots. The meeting ended with all seventy-three members of the party singing L'Internationale.
== Bibliography == Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999). Advanced Inorganic Chemistry (6th ed.). John Wiley & Sons. ISBN 978-0-471-19957-1. Cunningham, B. B. (1968). "Californium". In Hampel, Clifford A. (ed.). The Encyclopedia of the Chemical Elements. Reinhold Book Corporation. LCCN 68029938. Emsley, John (1998). The Elements. Oxford University Press. ISBN 978-0-19-855818-7. Emsley, John (2001). "Californium". Nature's Building Blocks: An A-Z Guide to the Elements. Oxford University Press. ISBN 978-0-19-850340-8. Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-7506-3365-9. Haire, Richard G. (2006). "Californium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Springer Science+Business Media. ISBN 978-1-4020-3555-5. Heiserman, David L. (1992). "Element 98: Californium". Exploring Chemical Elements and their Compounds. TAB Books. ISBN 978-0-8306-3018-9. Jakubke, Hans-Dieter; Jeschkeit, Hans, eds. (1994). Concise Encyclopedia Chemistry. trans. rev. Eagleson, Mary. Walter de Gruyter. ISBN 978-3-11-011451-5. Krebs, Robert (2006). The History and Use of our Earth's Chemical Elements: A Reference Guide. Greenwood Publishing Group. ISBN 978-0-313-33438-2. Lide, David R., ed. (2006). Handbook of Chemistry and Physics (87th ed.). CRC Press, Taylor & Francis Group. ISBN 978-0-8493-0487-3. National Research Council (U.S.). Committee on Radiation Source Use and Replacement (2008).
== Interactions == When combined with antidepressants of the MAOI or SSRI class, very high parenteral doses of 5-HTP can cause acute serotonin syndrome in rats. It is unclear if such findings have clinical relevance, as most drugs will cause serious adverse events or death in rodents at very high doses. In humans, 5-HTP has never been clinically associated with serotonin syndrome – although a case report suggests 5-HTP can precipitate mania when added to an MAOI. When combined with carbidopa (as a treatment for symptoms of Parkinson's disease), 5-HTP causes nausea and vomiting; however, this can be alleviated via administration of granisetron. Cases of scleroderma-like illness have been reported in patients using carbidopa and 5-HTP. Oral 5-HTP results in an increase in urinary 5-HIAA, a serotonin metabolite, indicating that 5-HTP is peripherally metabolized to serotonin, which is then metabolized. This might cause false positive results in tests looking for carcinoid syndrome. Due to the conversion of 5-HTP into serotonin by the liver, there could be a risk of heart valve disease from serotonin's effect on the heart, as based on preclinical findings. However, 5-HTP has not been associated with cardiac toxicity in humans. It has been suggested that 5-HTP may cause eosinophilia-myalgia syndrome (EMS), a serious condition which results in extreme muscle tenderness, myalgia, and blood abnormalities. However, there is evidence to show that EMS was likely caused by a contaminant in certain 5-HTP supplements.
The term topography originated in ancient Greece and continued in ancient Rome, as the detailed description of a place. The word comes from the Greek τόπος (topos, "place") and -γραφία (-graphia, "writing"). In classical literature this refers to writing about a place or places, what is now largely called 'local history'. In Britain and in Europe in general, the word topography is still sometimes used in its original sense. Detailed military surveys in Britain (beginning in the late eighteenth century) were called Ordnance Surveys, and this term was used into the 20th century as generic for topographic surveys and maps. The earliest scientific surveys in France were the Cassini maps after the family who produced them over four generations. The term "topographic surveys" appears to be American in origin. The earliest detailed surveys in the United States were made by the "Topographical Bureau of the Army", formed during the War of 1812, which became the Corps of Topographical Engineers in 1838. After the work of national mapping was assumed by the United States Geological Survey in 1878, the term topographical remained as a general term for detailed surveys and mapping programs, and has been adopted by most other nations as standard. In the 20th century, the term topography started to be used to describe surface description in other fields where mapping in a broader sense is used, particularly in medical fields such as neurology.
The term redox state is often used to describe the balance of GSH/GSSG, NAD+/NADH and NADP+/NADPH in a biological system such as a cell or organ. The redox state is reflected in the balance of several sets of metabolites (e.g., lactate and pyruvate, beta-hydroxybutyrate and acetoacetate), whose interconversion is dependent on these ratios. Redox mechanisms also control some cellular processes. Redox proteins and their genes must be co-located for redox regulation according to the CoRR hypothesis for the function of DNA in mitochondria and chloroplasts.
Sources: en.wikipedia.org
建议在低温、避光、干燥环境中密封保存，常见条件为 2 至 8 摄氏度，长期存放可置于更低温度。应避免反复冻融，并尽量减少容器开启次数。
溶解后的稳定时间通常短于固体形态，受浓度、缓冲液和容器材质影响。冷藏条件下一般只能维持较短时间，具体期限应通过实际稳定性实验确认。
反相高效液相色谱用于纯度与含量测定，液相色谱串联质谱用于生物基质中的定量，体积排阻色谱用于检测聚集体。多种方法结合才能较完整地表征样品。
It activates both the glucose-dependent insulinotropic polypeptide receptor and the glucagon-like peptide-1 receptor. This dual activity separates it from agents that act on only one of the two receptors. The relative contribution of each receptor to clinical effects remains an open area of study.