Everything below concerns refrigeration. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-03-14. Numbers and descriptions here follow the published literature rather than marketing material.
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。
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.
Long-term storage of the solid generally relies on temperatures at or below minus twenty degrees Celsius, while short-term working stocks may be held refrigerated. Light exposure is limited because photodegradation can alter side chains over extended periods. Solutions prepared for analysis are less stable than the dry powder and are typically used within the same working day. Buffer choice matters, since some aqueous conditions favor deamidation or oxidation at specific residues. Stability data are usually generated under defined accelerated conditions and then extrapolated with stated assumptions.
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.
| 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 |
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.
Bulk peptide material is normally characterised by reversed-phase high-performance liquid chromatography, which separates the target sequence from truncation products and other closely related impurities. Ultraviolet detection near 214 nanometres is common because the peptide backbone absorbs in that region. Mass spectrometry, usually electrospray ionisation coupled to a mass analyser, is used to confirm the molecular mass. Because the molecule carries a lipophilic side chain, gradient methods often need a relatively high organic modifier fraction to elute it within a practical retention window.
Like most synthetic peptides of this size, the material is commonly supplied as a lyophilised powder that appears white to off-white. It dissolves in aqueous buffers and in mixtures of water with a small proportion of organic solvent, though the fatty acid portion reduces solubility in pure water relative to short peptides. Hygroscopic behaviour is reported for many peptide powders, so weighing is usually performed quickly and under controlled humidity. Working solutions are typically prepared fresh and kept cold.
Analytical characterization of tirzepatide typically employs reversed-phase high-performance liquid chromatography (RP-HPLC) for purity assessment and peptide mapping. Mass spectrometry, often coupled with electrospray ionization, confirms molecular weight and sequence integrity. Amino acid analysis and capillary electrophoresis may also be used to detect impurities or degradation products. These methods are essential for batch release and stability studies.
Storage recommendations for tirzepatide generally specify refrigeration at 2–8 °C to maintain stability. The peptide should be protected from light and kept in its original packaging to prevent aggregation or adsorption. Freezing is not recommended because freeze-thaw cycles can cause aggregation or precipitation. Once dispensed, storage conditions and in-use periods follow product-specific labeling, which may allow room temperature storage for a limited time.
Solid tirzepatide is handled as a lyophilised, hygroscopic peptide powder that should be kept desiccated, protected from light, and stored frozen, typically at or below minus twenty degrees Celsius for long-term retention. Material left at ambient temperature for extended periods can take up moisture, which promotes aggregation and deamidation. Commercial liquid presentations are kept refrigerated between two and eight degrees Celsius and are not frozen. Reconstituted laboratory solutions are generally held cold and used within a short window because hydrolysis and oxidation continue slowly in solution.
Identity and purity are usually established with reversed-phase high-performance liquid chromatography for the main peak and with mass spectrometry for the observed molecular mass. Peptide mapping after enzymatic digestion confirms the primary sequence, while amino acid analysis provides a quantitative composition check. Size-exclusion chromatography and ion-exchange chromatography are used to look for aggregates and charge variants. Water content, residual solvents, and counter-ion content are measured separately, since a lyophilised powder is often reported on an as-is basis unless a correction is applied.
==== Bands ==== Opus (Austrian band), an Austrian pop-rock group Opus (Yugoslav band), a Yugoslav progressive rock group Opus (Latvian band), Latvian music group Pur (band), a German pop group originally known as "Opus"
The Essendon Football Club, nicknamed the Bombers or colloquially the Dons, is a professional Australian rules football club that plays in the Australian Football League (AFL), the game's premier competition. Formed by the McCracken family in their Ascot Vale home in 1872, the club played its first recorded game in 1873. From 1878 until 1896, the club played in the Victorian Football Association (VFA), where it won four consecutive premierships between 1891 and 1894. In 1896, Essendon joined seven other clubs to form the breakaway Victorian Football League (known as the AFL since 1990), winning the inaugural VFL premiership in 1897. Headquartered at Windy Hill from 1922 to 2013, the club moved to The Hangar in late 2013. The club currently shares its home games between Docklands Stadium and the Melbourne Cricket Ground. Andrew McGrath serves as the club captain as of 2026. Essendon is one of Australia's most successful and prominent football clubs, having won 16 VFL/AFL premierships, which is tied (along with Carlton and Collingwood) for the most of any club in the competition. The club experienced notable golden eras under captain-coach Dick Reynolds in the 1940s and 1950s, and under coach Kevin Sheedy from the 1980s to the early 2000s, cultivating the iconic "Baby Bombers" team in 1993 and recording a historically dominant season in 2000. However, the club has struggled to achieve significant on-field success in the 21st century, having not won a finals match since 2004.
=== Books === 1910 Conflicts in the Child's Soul 1912 Psychology of the Unconscious 1916 Seven Sermons to the Dead (a part of the Red Book, published privately) 1921 Psychological Types 1933 Modern Man in Search of a Soul (essays) 1944 Psychology and Alchemy 1951 Aion: Researches into the Phenomenology of the Self 1952 Symbols of Transformation (revised edition of Psychology of the Unconscious) 1954 Answer to Job 1956 Mysterium Coniunctionis: An Inquiry into the Separation and Synthesis of Psychic Opposites in Alchemy 1957 The Undiscovered Self 1959 Flying Saucers: A Modern Myth of Things Seen in the Skies (Translated by R. F. C. Hull) 1960 Synchronicity: An Acausal Connecting Principle 1962 Memories, Dreams, Reflections (autobiography, co-written with Aniela Jaffé) 1964 Man and His Symbols (Jung contributed one part, his last writing before his death in 1961; the other four parts are by Marie-Louise von Franz, Joseph L. Henderson, Jaffé, and Jolande Jacobi) 2009 The Red Book: Liber Novus (manuscript produced c. 1915–1932) 2020 Black Books (private journals produced c. 1913–1932, on which the Red Book is based)
Sources: en.wikipedia.org
Along with the international protection, Mexico has also sought similar protection for tequila in other important countries and regions through a number of bilateral and multilateral agreements. Pursuant to Annex 313 of the North American Free Trade Agreement (NAFTA), Canada and the United States recognize tequila and mezcal as products originating from Mexico and, consequently, do not permit the sale of any product as tequila and/or mezcal unless they have been lawfully prepared in Mexico. The Mexican government enforces the tequila intellectual property through the Mexican Institute of Industrial Property (IMPI). The use of the name tequila is authorized and administered only by IMPI. IMPI may prohibit any unauthorized use of the name that may create confusion for the consumers, or constitute an act of unfair competition. Despite protection under the Lisbon Agreement and NAFTA, tequila still faced competition from some pseudo tequilas. During the mid-1990s, as much as 3.5 million liters of these liquors were sold annually in Europe. The European liquors were produced from sugars of agave-like plants and were illegally labeled as tequila. Following the NAFTA precedent, Mexico entered into a bilateral agreement with the European Union concerning the mutual recognition and protection of AO in the spirits sector. Under this agreement the EU recognizes tequila and mezcal as "denominations of origin", although enforcement has still been quite lax in Europe.
=== Transdermal administration === Progesterone for transdermal administration is not approved by the FDA in the United States. Multiple pharmaceutical companies have pursued the development of systemic transdermal progesterone formulations, but ultimately none have successfully been developed and introduced for clinical use. Although no formulations of transdermal progesterone are approved for systemic use, a 1% topical gel formulation of progesterone for local use on the breasts is approved to treat breast pain under the brand name Progestogel in various countries. Although no formulations of transdermal progesterone are approved for systemic use, transdermal progesterone is available in the form of creams and gels from custom compounding pharmacies in some countries, and is also available over-the-counter without a prescription in the United States. Transdermal progesterone has been used by thousands of women as a component of menopausal hormone therapy in the United States and Europe. However, these products are unregulated and have not been clinically tested, often with little being known about their pharmacokinetics. In addition, the absorption of transdermal progesterone may differ significantly from formulation to formulation due to widely varying ingredients. Moreover, the systemic effectiveness of transdermal progesterone in producing therapeutic progestogenic effects, most importantly adequate endometrial protection against estrogens, is controversial.
=== 18 May === Fourteen people were killed by RSF shelling on a market in the Abu Shouk camp. One person was killed in an RSF attack on the village of Al-Samra in White Nile State. Nine people, including seven military personnel, were killed in an RSF drone strike on a base belonging to the Sudan Shield Forces in the Al-Butana plain of Gezira State.
Sources: en.wikipedia.org
Body mass index (BMI) is a value used to get a general sense of a person's overall mass and is calculated using a person's height and weight. It is more often used than weight alone to determine if an individual is underweight, normal weight, overweight, or obese. The following two equations can used to calculate BMI depending on the units used for height (meters vs. inches) and weight (kilograms vs. pounds):
=== Indirect separation of enantiomer === Indirect enantiomer separation involves the interaction between the chiral analyte (CA) of interest and the suitable reactive CS (in this case it is an enantiopure chiral derivatizing agent, CDA) leading to the formation of a covalent diastereomeric complex that can be separated with an achiral chromatographic technique. Therapeutic agents often contain reactive functional groups (amino, hydroxyl, epoxy, carbonyl and carboxylic acid, etc.) in their structures. They are converted into covalently bonded diastereomeric derivatives using enantiomerically pure chiral derivatizing agent. The diastereomers thus formed unlike enantiomers, exhibit different physicochemical properties in an achiral environment and are eventually separated as a result of differential retention time on a stationary phase. The success of this approach depends on the availability of stable enantiopure chiral derivatizing agent (CDA) and on the presence of a suitable reactive functional group in the chiral drug molecule for covalent formation of diastereomeric derivative. The reaction of a racemic, (R,S)- Drug with a chirally and chemically pure chiral derivatizing agent, (R')-CDA, will afford diastereomeric products, (R)-Drug-(R')-CDA + (S)-Drug-(R')- CDA. The chiral derivatization reaction scheme is illustrated in the box on the right hand side. In contrast to enantiomers, diastereomers have different physicochemical properties that make them separable on regular achiral stationary phases.
=== Absorbed dose and dose equivalent === The British physicist and radiologist and founder of radiobiology Louis Harold Gray (1905-1965) introduced the unit Rad (acronym for radiation absorbed dose) in the 1930s, which was renamed Gray (Gy) after him in 1978. One gray is a mass-specific quantity and corresponds to the energy of one joule absorbed by one kilogram of body weight. Acute whole-body exposures in excess of four Gy are usually fatal to humans. The different types of radiation ionize to different degrees. Ionization is any process in which one or more electrons are removed from an atom or molecule, leaving the atom or molecule as a positively charged ion (cation). Each type of radiation is therefore assigned a dimensionless weighting factor that expresses its biological effectiveness. For X-rays, gamma and beta radiation, the factor is one, alpha radiation reaches a factor of twenty, and for neutron radiation it is between five and twenty, depending on the energy. Multiplying the absorbed dose in Gy by the weighting factor gives the equivalent dose, expressed in Sievert (Sv). It is named after the Swedish physician and physicist Rolf Maximilian Sievert (1896-1966). Sievert was the founder of radiation protection research and developed the Sievert chamber in 1929 to measure the intensity of X-rays. He founded the International Commission on Radiation Units and Measurements (ICRU) and later became chairman of the International Commission on Radiological Protection (ICRP).
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。
Water promotes hydrolysis and deamidation, so removing it slows degradation during transport and storage. The dry solid is also less prone to microbial growth than a solution. Reconstitution is therefore performed close to the point of use.