zwitterion 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.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
In chemical terms, creatine monohydrate is often described as N-(aminoiminomethyl)-N-methylglycine monohydrate, though nomenclature varies. Its solid state consists of zwitterionic creatine molecules linked with water through hydrogen bonding. The compound dissolves in water, but dissolution rate depends on particle size, temperature, and agitation. Once dissolved, the hydrate water becomes part of the solvent, leaving free creatine in solution. The monohydrate is not the same as creatine anhydrous, which lacks the water of crystallization and has a higher creatine fraction by mass.
Commercial creatine monohydrate is typically a white to off-white powder with low odor. It is commonly sold as a fine powder, micronized powder, or larger crystals, but these are physical forms of the same chemical. Purity grades vary, and products may contain small amounts of related substances such as creatinine, dicyandiamide, or moisture. The monohydrate is often selected for supplements and research because its production is well established and its behavior in water is predictable. Analytical certificates usually report assay, loss on drying, and heavy metals.
Creatine monohydrate is a crystalline compound formed from creatine and one water molecule in its solid lattice. Creatine itself is a nitrogen-containing organic acid involved in energy transfer in muscle and other tissues. The monohydrate form is the most common solid form used in research and commercial products because it is stable and easy to handle. The term "monohydrate" refers to the fixed one-to-one ratio of water to creatine in the crystal, not to moisture content. This distinction matters when comparing labels or calculating creatine content.
Storage recommendations generally emphasize a cool, dry place away from direct sunlight and strong oxidizers. Sealed containers limit humidity exchange, which helps prevent clumping and gradual conversion to creatinine. Long-term stability studies usually monitor appearance, moisture, and purity at intervals under defined temperature and humidity conditions. Accelerated tests at elevated temperature can reveal degradation pathways, but they do not perfectly predict room-temperature shelf life. Questions remain about how much creatinine formation is acceptable in different product categories and how packaging choices affect that rate over time.
Commercial creatine monohydrate is typically manufactured through chemical synthesis, often starting from sarcosine and cyanamide. The resulting material is crystallized, washed, and dried to a specified hydrate content. Finished lots are tested for identity, purity, moisture, and heavy metals before release. Because the compound can cyclize to creatinine under heat or prolonged storage in solution, manufacturers control temperature and humidity during processing. The solid itself is relatively stable when kept dry and sealed, but moisture uptake can cause caking and complicate accurate assay.
| Property | Value | Notes |
|---|---|---|
| Chemical name | N-(aminoiminomethyl)-N-methylglycine monohydrate | Nomenclature varies across sources. |
| Common synonyms | Creatine hydrate; creatine monohydrate | “Monohydrate” specifies one water per creatine. |
| Appearance | White to off-white crystalline powder | Particle size and flowability vary by grade. |
| Solubility class | Soluble in water; slightly soluble in ethanol | Dissolution increases with temperature and stirring. |
| Typical storage | Tightly closed container at 15–25 °C | Protect from moisture and excessive heat. |
Handling practices aim to limit moisture uptake and thermal exposure. Containers should stay closed when not in use, and storage areas should avoid direct sunlight, strong heat, and high humidity. Caking can occur when powder absorbs water, even if the creatine itself has not fully degraded. Aqueous stock solutions are best prepared fresh when needed because they are less stable than the solid. Open questions include how different excipients, packaging materials, and climate conditions affect long-term stability across global supply chains.
Solid creatine monohydrate is relatively stable when kept dry and sealed, but heat and moisture accelerate its conversion to creatinine. This degradation involves intramolecular cyclization, a process that removes water and forms a less useful compound for phosphocreatine metabolism. Powder stored under cool, dry conditions can remain within specification for extended periods, though exact shelf life depends on packaging, humidity, and initial purity. Aqueous solutions degrade faster than dry powder, with pH and temperature influencing the rate. Because degradation is gradual, analytical testing is used to confirm potency at manufacture and during stability studies.
Identity and purity are assessed with several complementary methods. High-performance liquid chromatography can separate creatine from creatinine and related impurities, often with ultraviolet detection. Nuclear magnetic resonance and infrared spectroscopy provide structural confirmation, while Karl Fischer titration measures water content. Elemental analysis and mass spectrometry may be used for additional confirmation, especially in research or forensic settings. No single method captures every quality attribute, so laboratories typically combine results and compare them against a specification.
Creatine monohydrate is sold as a dietary ingredient in some countries and as a food supplement in others. Regulatory frameworks vary, so purity limits, labeling rules, and permitted claims are not globally uniform. In the United States, it falls under dietary supplement rules, whereas the European Union treats it as a food supplement ingredient. Pharmacopeial monographs, where they exist, can provide public quality standards, but not every product is required to meet them. Questions about long-term effects and patterns of use remain areas of active study rather than settled regulatory findings.
Solid creatine monohydrate is generally stable when kept cool and dry, but it can hydrolyze to creatinine over time. Moisture, heat, and acidic conditions accelerate this conversion, which reduces assay values and changes the material's properties. Creatinine is a cyclic dehydration product that is also a normal human metabolite, so its presence in a sample is not necessarily a health concern by itself. In quality testing, creatinine is monitored as a marker of degradation and purity.
In dry solid form, creatine monohydrate is relatively stable when protected from moisture and heat. The crystal lattice includes water, and exposure to high humidity can cause caking or gradual changes in powder flow. Elevated temperatures may accelerate decomposition, particularly if moisture is present. Studies generally report that sealed, dry material retains acceptable purity for extended periods, although exact shelf life depends on packaging and storage conditions. Light exposure is not usually considered a major factor for this compound.
In aqueous solution, creatine monohydrate undergoes a slow conversion to creatinine, a cyclized degradation product. This reaction is pH- and temperature-dependent, and it proceeds faster in warm or alkaline conditions. Because the conversion is gradual, analytical measurements of creatine in solution must account for time and storage history. The equilibrium favors creatinine more strongly at higher temperatures, which is relevant to sample handling in laboratories and to beverage formulations. Refrigeration slows but does not entirely stop this process.
The compound was identified in the nineteenth century after chemists isolated a nitrogenous substance from meat extracts. Later work established its role in muscle energy metabolism and its conversion to phosphocreatine. Chemical synthesis of creatine followed, and industrial production made the monohydrate widely available as a purified powder. Interest expanded in the late twentieth century when researchers began studying creatine supplementation and muscle physiology. Historical accounts sometimes differ on exact dates and attributions, but the broad sequence from tissue extracts to synthetic production is well documented.
In the body, creatine is obtained from dietary meat and fish and is also synthesized from arginine, glycine, and methionine. Muscle stores creatine and phosphocreatine, which participate in the rapid regeneration of adenosine triphosphate during short, intense activity. The monohydrate form is used in research because it is chemically defined, stable as a dry solid, and relatively inexpensive to produce. Questions remain about whether other creatine forms offer meaningful advantages in absorption or tissue retention, and findings vary across studies and populations.
Creatine monohydrate is a crystalline compound formed from creatine and one molecule of water. Creatine itself is a nitrogen-containing organic acid that occurs in vertebrate muscle and other tissues. The monohydrate designation refers to the water included in the crystal lattice, not to water added during manufacturing. Its chemical formula is commonly written as C4H9N3O2·H2O. The solid is typically a white, odorless powder with low solubility in water at room temperature. It is one of several creatine forms described in scientific and commercial literature.
== External links == "Relaxin Family Peptide Receptors: Motilin". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology. Archived from the original on 2016-03-03. Retrieved 2007-10-25. relaxin+receptors at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
Different 2A peptides have different peptide-bond-skipping efficiencies, with T2A and P2A being the most efficient and F2A the least efficient. Therefore, up to 50% of F2A-linked proteins can in fact be produced as a fusion protein, which might cause some unpredictable outcomes, including a gain of function. One study reported that 2A sites cause the ribosome to fall off approximately 60% of the time, and that, together with ribosome read-through of about 10% for P2A and T2A, this results in reducing expression of the downstream peptide chain by about 70%. However, the level of drop-off detected in this study varied widely depending on the exact construct used, with some constructs showing little evidence of drop-off; furthermore, within a tri-cistronic transcript it reported a higher level of ribosome drop-off after one 2A sequence than after two 2As combined, which is at odds with a linear model of translation. IRES Recombinant DNA
Thirdly and most importantly, IUPAC rejected the name seaborgium for element 106, having just approved a rule that an element could not be named after a living person, even though the IUPAC had given the LBNL team the sole credit for its discovery. In 1997, IUPAC renamed elements 104 to 109, and gave elements 104 and 106 the Berkeley proposals rutherfordium and seaborgium. The name dubnium was given to element 105 at the same time. The 1997 names were accepted by researchers and became the standard.
18-Methoxycoronaridine (18-MC; developmental code name MM-110), also known as zolunicant (INNTooltip International Nonproprietary Name), is a derivative of ibogaine invented in 1996 by the research team around the pharmacologist Stanley D. Glick from the Albany Medical College and the chemists Upul K. Bandarage and Martin E. Kuehne from the University of Vermont. 18-MC was originally developed by Savant HWP and later acquired by MindMed in 2019 for development as a treatment for opioid use disorder. A Phase 1 trial in healthy volunteers was completed in 2022 with favorable safety and tolerability. Due to strategic reprioritization, MindMed discontinued active development of MM-110 in 2023 and has been seeking non-dilutive funding or partners to potentially restart the program; as of 2025 the program remains shelved. A separate Phase 2 trial in Brazil for cutaneous leishmaniasis (initiated 2017) has unknown status with no published results.
Many of the opposition groups subsequently began competing for influence in the power vacuum that followed the ouster of Barre's regime. In the south, armed factions led by USC commanders General Mohamed Farah Aidid and Ali Mahdi Mohamed, in particular, clashed as each sought to exert authority over the capital. In 1991, a multi-phased international conference on Somalia was held in neighbouring Djibouti. Owing to the legitimacy bestowed on Muhammad by the Djibouti conference, he was subsequently recognised by the international community as the new President of Somalia. He was not able to exert his authority beyond parts of the capital. Power was instead vied with other faction leaders in the southern half of Somalia and with autonomous sub-national entities in the north. The Djibouti conference was followed by two abortive agreements for national reconciliation and disarmament, which were signed by 15 political stakeholders: an agreement to hold an Informal Preparatory Meeting on National Reconciliation, and the 1993 Addis Ababa Agreement made at the Conference on National Reconciliation. In 1998, the state of Puntland was established under the leadership of Abdullahi Yusuf, head of the Somali Salvation Democratic Front. In the early 1990s, due to the protracted lack of a permanent central authority, Somalia began to be characterised as a "failed state". Following the collapse of the Somali Democratic Republic in early 1991, a new phenomenon emerged – the establishment of Sharia courts to impose law and order on the volatile neighborhoods of Mogadishu.
Sources: en.wikipedia.org
== Clinical significance == The enzymes that make and use NAD+ and NADH are important in both pharmacology and the research into future treatments for disease. Drug design and drug development exploits NAD+ in three ways: as a direct target of drugs, by designing enzyme inhibitors or activators based on its structure that change the activity of NAD-dependent enzymes, and by trying to inhibit NAD+ biosynthesis. Because cancer cells utilize increased glycolysis, and because NAD enhances glycolysis, nicotinamide phosphoribosyltransferase (NAD salvage pathway) is often amplified in cancer cells. It has been studied for its potential use in the therapy of neurodegenerative diseases such as Alzheimer's and Parkinson's disease as well as multiple sclerosis. A placebo-controlled clinical trial of NADH (which excluded NADH precursors) in people with Parkinson's failed to show any effect. NAD+ is also a direct target of the drug isoniazid, which is used in the treatment of tuberculosis, an infection caused by Mycobacterium tuberculosis. Isoniazid is a prodrug and once it has entered the bacteria, it is activated by a peroxidase enzyme, which oxidizes the compound into a free radical form. This radical then reacts with NADH, to produce adducts that are very potent inhibitors of the enzymes enoyl-acyl carrier protein reductase, and dihydrofolate reductase. Since many oxidoreductases use NAD+ and NADH as substrates, and bind them using a highly conserved structural motif, the idea that inhibitors based on NAD+ could be specific to one enzyme is surprising.
A similar stele fragment (ES 1027), 57 centimeters high by 42 centimeters wide by 20 deep, depicting Naram-Sin was found a few miles north-east of Diarbekr, at Pir Hüseyin in a well, though this was not its original context. It is said to have been first found in Miyafarkin, a village about 75 kilometers northeast of Diarbekr. Fragments of an alabaster stele representing captives being led by Akkadian soldiers is sometimes attributed to Narim-Sin (or Rimush or Manishtushu) on stylistic grounds. In particular, it is considered as more sophisticated graphically than the steles of Sargon of Akkad or those of Rimush or Manishtushu. Two fragments (IM 55639 and IM 59205) are in the National Museum of Iraq, and one (MFA 66.89) is the Boston Museum. The stele is quite fragmentary, but attempts at reconstitution have been made. Depending on sources, the fragments were excavated in Wasit, al-Hay district, Wasit Governorate, or in Nasiriyah, both locations in Iraq. It is thought that the stele represents the result of the campaigns of Naram-Sin to Cilicia or Anatolia. This is suggested by the characteristics of the booty carried by the soldiers in the stele, especially the metal vessel carried by the main soldier, the design of which is unknown in Mesopotamia, but on the contrary well known in contemporary Anatolia.
The first two bus operating contracts for the new Weaver Network were awarded in September 2026 to FirstGroup, covering Huddersfield and parts of Leeds, and Transdev Blazefield, covering Dewsbury. In October 2021, £830 million of funding was announced for the West Yorkshire Combined Authority through the City Region Sustainable Transport Settlement, including funding to develop mass transit proposals for the region. Consultation was undertaken between July and September 2024 on proposed tram routes linking Bradford and Leeds, and St. James Hospital, central Leeds and White Rose Shopping Centre. Following a review by the National Infrastructure and Service Transformation Authority, the programme was moved to a more sequential approach intended to reduce delivery risk, contributing to a delay in the expected timetable for the scheme.
== Places == Greece (ISO 3166/NATO:GR) Grand Rapids, Michigan, United States Grand Rapids, Minnesota, United States Giurgiu County, Romania Grisons, a Swiss canton (ISO:CH-GR) Groningen (province), Netherlands (ISO:NL-GR) Province of Grosseto, Tuscany, Italy Garden Reach, Kolkata, West Bengal, India
Acrosin is a digestive enzyme that acts as a protease. In humans, acrosin is encoded by the ACR gene. Acrosin is released from the acrosome of spermatozoa as a consequence of the acrosome reaction. It aids in the penetration of the Zona Pellucida.
Sources: en.wikipedia.org
The following table shows the electron configuration of a neutral gas-phase atom of each element. Different configurations can be favoured in different chemical environments. The main-group elements have entirely regular electron configurations; the transition and inner transition elements show twenty irregularities due to the aforementioned competition between subshells close in energy level. For the last ten elements (109–118), experimental data is lacking and therefore calculated configurations have been shown instead. Completely filled subshells have been greyed out.
Existing evidence demonstrates that mental disorders are connected with gender. For example, an elevated risk of depression for women was observed at different phases of life, commencing in adolescence in different contexts. Females have a higher risk of anxiety and eating disorders, whereas males have a higher chance of substance abuse and behavioral and developmental issues. This does not imply that women are less likely to suffer from developmental disorders such autism spectrum disorder, attention deficit hyperactivity disorder, Tourette syndrome, or early-onset schizophrenia. Ethnicity and ethnic heterogeneity have also been identified as risk factors for the prevalence of mental disorders, with minority groups being at a higher risk due to discrimination and exclusion. Approximately 8 in 10 people with autism suffer from a mental health problem in their lifetime, in comparison to 1 in 4 of the general population that suffers from a mental health problem in their lifetimes. Women experience more emotional regulation due to connective relationships with other women or family members. Although women encounter less judgment when accessing professional treatment, the labeling of being overly emotional and unstable causes concern for many women hesitant to seek help. Men's mental health has been described as a silent crisis. In most countries the suicide rate of men is higher than for women. Societal pressures influence an individual's perception regarding personal mental health issues and the importance of seeking professional help.
=== Emergency approvals (EUA) === Emergency Use Authorization (EUA) is a mechanism that was created to facilitate the availability and use of medical countermeasures, including vaccines and personal protective equipment, during public health emergencies such as the Zika virus epidemic, the Ebola virus epidemic and the COVID-19 pandemic.
Polystyrene foams are 95–98% air. Polystyrene foams are good thermal insulators and are therefore often used as building insulation materials, such as in insulating concrete forms and structural insulated panel building systems. Grey polystyrene foam, incorporating graphite, has superior insulation properties. Carl Munters and John Gudbrand Tandberg of Sweden received a US patent for polystyrene foam as an insulation product in 1935 (USA patent number 2,023,204). PS foams also exhibit good damping properties, therefore it is used widely in packaging. The trademark Styrofoam by Dow Chemical Company is informally used (mainly US & Canada) for all foamed polystyrene products, although strictly it should only be used for "extruded closed-cell" polystyrene foams made by Dow Chemicals. Foams are also used for non-weight-bearing architectural structures (such as ornamental pillars).
Sources: en.wikipedia.org
It is a solid form of creatine that contains one water molecule per creatine molecule in the crystal lattice. The hydrate water is part of the crystal structure rather than loose moisture. The term is often used for the common crystalline powder grade.
Creatine anhydrous lacks the water of crystallization and therefore contains a higher creatine fraction by mass. The monohydrate is more common in commerce and research because it is stable and easy to handle. The two forms are not identical in solid state, though both yield creatine when dissolved.
Creatine is the base molecule, while creatine monohydrate is a hydrate of that molecule. Once dissolved, the hydrate water becomes part of the solvent and free creatine is present. In casual usage the names are often shortened to creatine, but the solid forms differ.
Laboratories typically combine chromatographic separation with moisture and elemental analysis. High-performance liquid chromatography can quantify creatine and related substances such as creatinine. Moisture methods confirm the hydrate form and help detect excess water.