This is a working overview of creatine, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-09. Anything still debated is marked as such rather than presented as settled.
Quality control of creatine monohydrate relies on a combination of identity, purity, and moisture tests. High-performance liquid chromatography with ultraviolet detection is widely used to separate creatine from creatinine and other related nitrogenous compounds. Spectroscopic methods such as infrared and nuclear magnetic resonance provide structural confirmation. Because the material is a hydrate, water content is measured separately, often by Karl Fischer titration. These tests together establish whether a lot meets a defined specification.
Manufacturing processes can leave trace amounts of dicyandiamide, creatinine, or residual solvents, depending on the synthetic route and purification steps. Heavy metals, arsenic, and microbial contamination are also monitored for food or pharmaceutical grades. Particle size distribution can affect dissolution behavior and blending uniformity, so it may be specified for certain applications. Analytical results are reported on a dry basis or as-is basis, and the difference matters when comparing certificates of analysis. Open questions remain about how minor impurities influence long-term stability under varied storage conditions.
Stability studies typically examine the effects of temperature, humidity, and light on creatine monohydrate. Sealed containers stored in cool, dry conditions help limit moisture uptake and hydrolysis. Elevated temperature and high relative humidity can accelerate conversion to creatinine, especially in aqueous solutions. In solid dosage forms, excipients and processing steps may also affect stability. Published stability data are not fully consistent across studies because test conditions and analytical methods vary.
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.
Analytical laboratories commonly identify creatine monohydrate by high-performance liquid chromatography with ultraviolet detection, often after dissolving the sample in water or dilute acid. Ion-exchange or reversed-phase columns separate creatine from creatinine and related guanidino compounds. Nitrogen content can be checked by Kjeldahl or combustion methods, while moisture is measured by Karl Fischer titration or loss on drying. These techniques give complementary views: chromatographic purity addresses related substances, whereas moisture and elemental data confirm hydrate stoichiometry. No single test defines quality by itself; a combination is used in specifications.
| Property | Value | Notes |
|---|---|---|
| Assay method | HPLC with UV detection | Commonly used for content and purity |
| Water content | Karl Fischer titration | Measures total water including hydration |
| Identity test | FTIR or NMR spectroscopy | Confirms chemical structure |
| Common impurities | Dicyandiamide, creatinine | Process-related or degradation markers |
| Storage condition | Dry, sealed, 15–25 °C | Protect from moisture and heat |
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.
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.
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.
In solid form, creatine monohydrate is relatively stable when kept dry and away from heat. Moisture and elevated temperatures promote cyclization into creatinine, a related compound with no role in the phosphagen system. Degradation accelerates in aqueous solution, where the conversion can occur within hours to days depending on pH and temperature. Manufacturers typically recommend storage in sealed containers at room temperature, with relative humidity below 50 percent. Long-term stability data for opened containers are limited.
Analytical methods for creatine monohydrate focus on identity, purity, and degradation products. High-performance liquid chromatography with ultraviolet detection is common, often at a wavelength near 210 nanometers. Titration and nuclear magnetic resonance spectroscopy can also quantify the parent compound. Pharmacopeial monographs specify tests for appearance, solubility, water content, and related substances, including creatinine. Purity values above 99 percent are typical for pharmaceutical-grade material, though supplement-grade products vary. Independent verification can detect label discrepancies.
Sourcing and verification of creatine monohydrate involve both manufacturing origin and third-party testing. Industrial production commonly starts with sarcosine and cyanamide, followed by crystallization to obtain the monohydrate. Some products are derived from animal sources, while others are synthesized from non-animal precursors. Certificates of analysis report assay, heavy metals, and microbial limits. Regulations differ by country: in the United States it is sold as a dietary supplement, whereas in the European Union it falls under food supplement rules.
As of 2011, levothyroxine was the second-most commonly prescribed medication in the US, with 23.8 million prescriptions filled each year. In 2023, it was the third most commonly prescribed medication in the United States, with more than 80 million prescriptions.
The opioid crisis in the United States is largely fueled by drugs smuggled from Mexico; approximately 98% of fentanyl entering the U.S. comes from Mexico. In 2023, the Biden administration announced a crackdown on members of the Sinaloa Cartel smuggling fentanyl into the United States. In 2025, President Donald Trump launched a process to designate Mexican drug cartels and other criminal organizations as foreign terrorist organizations. The Trump administration has considered drone strikes against cartels in Mexico.
=== Announcement and delay === Valve announced Half-Life 2 at E3 2003, with demonstrations of the characters, animation and physics. The reaction was positive, and the game won the E3 Game of the Show award. Newell also announced a release date of September 30, 2003, hoping this would motivate the team. They worked long hours to meet the deadline, but by July it was clear they would miss it. Rumors spread of a delay. On September 23, Valve released a statement targeting a release for the holiday season, leading to fan backlash. Newell had been hesitant to announce a delay without a new release date. He said later: "We were paralyzed. We knew we weren't going to make the date we promised, and that was going to be a huge fiasco and really embarrassing. But we didn't have a new date to give people either." The graphics card manufacturer ATI had arranged a promotional event on Alcatraz Island to coincide with the planned release of Half-Life 2. Unable to pull out of the event, Newell gave a prepared speech, demonstrated the Source engine, and left without addressing questions.
Sources: en.wikipedia.org
Supergrade 2–3% Weapons grade 3–7% Fuel grade 7–18% Reactor grade 18% or more A nuclear reactor that is used to produce plutonium for weapons therefore generally has a means for exposing 238U to neutron radiation and for frequently replacing the irradiated 238U with new 238U. A reactor running on unenriched or moderately enriched uranium contains a great deal of 238U. However, most commercial nuclear power reactor designs require the entire reactor to shut down, often for weeks, in order to change the fuel elements. They therefore produce plutonium in a mix of isotopes that is not well-suited to weapon construction. Such a reactor could have machinery added that would permit 238U slugs to be placed near the core and changed frequently, or it could be shut down frequently, so proliferation is a concern; for this reason, the International Atomic Energy Agency inspects licensed reactors often. A few commercial power reactor designs, such as the reaktor bolshoy moshchnosti kanalniy (RBMK) and pressurized heavy water reactor (PHWR), do permit refueling without shutdowns, and they may pose a proliferation risk. By contrast, the Canadian CANDU heavy-water moderated, natural-uranium fueled reactor can also be refueled while operating, but it normally consumes most of the 239Pu it produces in situ; thus, it is not only inherently less proliferative than most reactors, but can even be operated as an "actinide incinerator".
August Wilhelm von Hofmann was apparently the first to introduce molecular models into organic chemistry, following August Kekule's introduction of the theory of chemical structure in 1858, and Alexander Crum Brown's introduction of printed structural formulas in 1861. At a Friday Evening Discourse at London's Royal Institution on April 7, 1865, he displayed molecular models of simple organic substances such as methane, ethane, and methyl chloride, which he had had constructed from differently colored table croquet balls connected together with thin brass tubes. Hofmann's original colour scheme (carbon = black, hydrogen = white, nitrogen = blue, oxygen = red, chlorine = green, and sulphur = yellow) has evolved into the later color schemes. In 1952, Corey and Pauling published a description of space-filling models of proteins and other biomolecules that they had been building at Caltech. Their models represented atoms by faceted hardwood balls, painted in different bright colors to indicate the respective chemical elements. Their color schema included
Recent changes in Moscow's regional climate are often cited by climate scientists as evidence of global warming, since the city is in the middle latitudes of the Northern Hemisphere; however, by definition, climate change is global, not regional. During the summer, very high temperatures are often recorded in the city (in 2001, 2002, 2003, 2010, 2011, and 2021). Along with the southern part of Central Russia, after recent years of hot summer seasons, Moscow's climate shows hot-summer classification trends. Winter has also become significantly milder: for example, the average January temperature in the early 1900s was −12.0 °C (10.4 °F), while it is currently about −7.0 °C (19.4 °F). The end of January–February is often colder, with frosts reaching −30.0 °C (−22.0 °F) a few nights per year (in 2006, 2010, 2011, 2012, and 2013). As of 2024, the most recent decade was the warmest in the history of meteorological observations of Moscow. Temperature changes in the city are shown in the table below:
Glutathione synthetase (GSS) (EC 6.3.2.3) is the second enzyme in the glutathione (GSH) biosynthesis pathway. It catalyses the condensation of gamma-glutamylcysteine and glycine, to form glutathione. Glutathione synthetase is also a potent antioxidant. It is found in many species including bacteria, yeast, mammals, and plants. In humans, defects in GSS are inherited in an autosomal recessive way and are the cause of severe metabolic acidosis, 5-oxoprolinuria, increased rate of haemolysis, and defective function of the central nervous system. Deficiencies in GSS can cause a spectrum of deleterious symptoms in plants and human beings alike. In eukaryotes, this is a homodimeric enzyme. The substrate-binding domain has a three-layer alpha/beta/alpha structure. This enzyme utilizes and stabilizes an acylphosphate intermediate to later perform a favorable nucleophilic attack of glycine.
Sources: en.wikipedia.org
Smallpox was eradicated by a massive international search for outbreaks, backed up with a vaccination program, starting in 1967. It was organised and co-ordinated by a World Health Organization (WHO) unit, set up and headed by Donald Henderson. The last case in the Americas occurred in 1971 (Brazil), south-east Asia (Indonesia) in 1972, and on the Indian subcontinent in 1975 (Bangladesh). After two years of intensive searches, what proved to be the last endemic case anywhere in the world occurred in Somalia, in October 1977. A Global Commission for the Certification of Smallpox Eradication chaired by Frank Fenner examined the evidence from, and visited where necessary, all countries where smallpox had been endemic. In December 1979 they concluded that smallpox had been eradicated; a conclusion endorsed by the WHO General Assembly in May 1980. However, even as the disease was being eradicated there still remained stocks of smallpox virus in many laboratories. Accelerated by two cases of smallpox in 1978, one fatal (Janet Parker), caused by an accidental and unexplained containment breach at a laboratory at the University of Birmingham Medical School, the WHO ensured that known stocks of smallpox virus were either destroyed or moved to safer laboratories. By 1979, only four laboratories were known to have smallpox virus.
== Causes == Causes of eclabium include but are not limited to General Ichthyosis. Congenital ichthyosis Lamellar ichthyosis Harlequin type Ichthyosis Scarring after trauma, such as surgery Gingivitis/periodontitis
This increased food demand is compounded by shocks and stresses, including more frequent and intense extreme and slow-onset events due to climate change, which threaten both agricultural production – crops, livestock, aquaculture, fisheries and forestry – and the middle and downstream stages of agrifood systems. But as agrifood systems are affected by climate shocks and stresses, they are themselves a major driver of climate change.
Sources: en.wikipedia.org
Purity is commonly assessed by HPLC, which separates creatine from related compounds such as creatinine. Water content is measured separately by Karl Fischer titration. Together these results help calculate the actual creatine content in a sample.
Creatine monohydrate contains water as part of its crystal structure, so some water is expected. Excess moisture can promote clumping, hydrolysis, or microbial growth. Karl Fischer titration measures total water and helps distinguish expected hydration from residual moisture.
Dicyandiamide, creatinine, and related nitrogenous compounds are common markers. Their levels are controlled by manufacturing processes and product specifications. Heavy metals and microbial limits may also be tested depending on the intended grade.
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.