Everything below concerns Creatinine. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-06-24. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Creatine monohydrate is one of several solid forms of creatine described in the literature. Other forms include anhydrous creatine, creatine hydrochloride, and creatine ethyl ester, each with different solubility and stability characteristics. The monohydrate is distinct from creatinine, a spontaneous breakdown compound that forms when creatine loses water and cyclizes. Commercial descriptions sometimes use synonyms such as methylguanidoacetic acid or N-(aminoiminomethyl)-N-methylglycine, which refer to the same base molecule. These names appear in chemical databases and product labels.
Creatine monohydrate is a crystalline compound formed when one molecule of creatine binds with one molecule of water. Creatine itself is a nitrogen-containing organic acid involved in cellular energy transfer, particularly in muscle and nerve tissue. The monohydrate form is the most common solid form used in research and commercial products because it is relatively stable and easy to handle. Its molecular formula is C4H9N3O2·H2O, and its molar mass is about 149.15 grams per mole.
In the human body, creatine is synthesized mainly in the liver and kidneys from the amino acids glycine, arginine, and methionine. Dietary sources include meat, fish, and other animal tissues, which supply preformed creatine. Because plant foods contain little or no creatine, dietary intake varies widely among populations. The compound is stored largely in skeletal muscle, where it is converted to phosphocreatine and used to regenerate adenosine triphosphate during short bursts of activity.
| 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. |
Quality assessment of creatine monohydrate typically uses high-performance liquid chromatography to separate creatine from creatinine and other impurities. Other methods include nuclear magnetic resonance spectroscopy, titration, and infrared spectroscopy for identity confirmation. Purity is often reported as a percentage of the labeled compound on a dry basis, while moisture content is measured separately. Because different analytical methods have different selectivity, comparing purity values across sources requires attention to the method and sample preparation.
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 animals, creatine is synthesized mainly in liver, kidney, and pancreas from arginine, glycine, and methionine. The first committed step transfers a guanidino group from arginine to glycine, forming guanidinoacetate. Subsequent methylation by S-adenosylmethionine yields creatine. Dietary sources include meat and fish; endogenous synthesis supplies part of the body pool. Most creatine is stored in skeletal muscle, where it is converted to phosphocreatine and participates in rapid regeneration of adenosine triphosphate during short, intense activity.
Commercial creatine products appear in several forms, including monohydrate, hydrochloride, citrate, nitrate, and ethyl ester. Creatine monohydrate is the most studied form and serves as a reference material in comparative research. Different forms vary in solubility, pH, and water content, but they share creatine as the active moiety after dissolution. Claims that one form is uniformly superior remain debated, and study designs often differ in population, exercise protocol, and outcome measures. Purity and hydration state are central to interpreting product labels.
Creatine monohydrate is the hydrated form of creatine, a nitrogen-containing organic acid involved in cellular energy transfer. Its molecular formula is C4H11N3O3, and it consists of creatine plus one water molecule in the crystal lattice. The anhydrous base, creatine, has the formula C4H9N3O2. The compound appears as a white, odorless, crystalline powder and is classified as a guanidine derivative. It is distinct from creatinine, a breakdown product measured in clinical chemistry.
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.
The two substrates of this enzyme are L-xylose and oxidised nicotinamide adenine dinucleotide phosphate (NADP+). Its products are L-xylono-1,4-lactone, reduced NADPH, and a proton. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is L-xylose:NADP+ 1-oxidoreductase. Other names in common use include L-xylose dehydrogenase, and NADPH-xylose reductase.
=== Harvesting === On a garden scale, the berries should be picked when dry and ripe. Commercially, most harvesting is done mechanically by straddle harvesters. These move continually down the rows, straddling a row of bushes, shaking the branches and stripping off the fruit. The blackcurrants are placed into half tonne bins and to minimise stoppage time, some machines have cross conveyors which direct the fruit into continuously moving trailers in the adjoining row. A modern machine can pick up to fifty tonnes of blackcurrants in a day using only one operator and two tractor drivers. The bins should be stored in a cool place. Some fruit is still picked by hand for use in the fresh fruit market.
In addition to assessing the size of the pituitary tumor, physicians also look for damage to surrounding tissues, and perform tests to assess whether production of other pituitary hormones are normal. Depending on the size of the tumor, physicians may request an eye exam that includes the measurement of visual fields. In the rare cases that other causes of hyperprolactinaemia, such as surgery, medication usage, renal and hepatic diseases, and seizures, are ruled out and no evidence of existing adenomas, the hyperprolactinaemia is considered "idiopathic". When the cause of hyperprolactinaemia is concluded as idiopathic, standard of care is given to patients, and an MRI is expected to be repeated in 6–12 months. In diagnosing hyperprolactinaemia in men, some physical signs may indicate the onset of the condition. Increased prolactin can affect the inhibition of GnRH secretion, which is responsible for libido, and the release of FSH (Follicle-stimulating hormone), LH (Luteinizing hormone), and testosterone. FSH in men is responsible to stimulate sperm production and LH is responsible for the stimulation of testosterone; with the inhibition of GnRH, FSH, and LH, physical signs that show in men include reduced sex drive and infertility, these symptoms suggests the onset of hyperprolactinaemia. However, a high measurement of prolactin may also result from the presence of macroprolactin, otherwise known as 'big prolactin' or 'big-big prolactin', in the serum. Macroprolactin occurs when prolactin polymerizes together and can bind with IgG to form complexes.
== Plot == In 1982, French President François Mitterrand launches an anonymous international competition to design a monumental building on the historic axis linking the Louvre and the Arc de Triomphe. To general surprise, the winning entry comes not from one of the world's major architectural firms but from Johan Otto von Spreckelsen, a 53-year-old architecture teacher from Copenhagen who is unknown in France and has previously built only a handful of structures, including his own house and three small chapels. Overnight, von Spreckelsen is put in charge of the largest building project of the era, the Grande Arche de la Défense, which he affectionately calls his "cube". Determined to see the structure built exactly as he first envisioned it, he clashes repeatedly with the realities of French bureaucracy, represented chiefly by project administrator Jean-Louis Subileau, and with the pragmatic French architect Paul Andreu, who is brought in to oversee the building's technical execution. His uncompromising attachment to his original design, including a marble cladding that proves both structurally troublesome and hugely expensive, increasingly isolates him from the project's engineers and financiers. When the 1986 legislative elections bring a new, right-wing government to power in cohabitation with Mitterrand, the political backing that had protected von Spreckelsen evaporates. The film ends on a bleak note: worn down by the years-long conflict, von Spreckelsen dies before the Grande Arche is completed, which is inaugurated two years later.
=== Neurosurgical research and innovations === Maroon has conducted extensive research into neurotrauma, brain tumors, and diseases of the spine, which led to many innovative techniques for diagnosing and treating these disorders. Maroon was the first to publish on the use of ultrasound to detect venous air emboli (1968). Maroon et al. were the first to publish on the use of ultrasound to detect air in patients during neurosurgical procedures (1969) and to assess ophthalmic artery reversal of flow, indicating a thrombosis of the carotid artery (1969). Maroon et al. published the simplified instrumentation for performing microvascular surgery in 1973, and in 1975, they pioneered the microsurgical approach to intra-orbital tumors. In 1977, they pioneered the use of CT scanning as a guidance system for performing intracranial biopsy. In the same year, Maroon published the first paper on "burning hands" syndrome related to sports-related spinal cord injuries in JAMA. In 1982, Maroon et al. pioneered the radical orbital decompression procedure for severe dysthyroid exophthalmos. In 1985, they were the first to compare microsurgical disc removal with chemonucleolysis and in 1986, they were the first to use a carbon dioxide laser in the management of lymphangiomas of the orbit. That year, Maroon et al. were among the first to describe their surgery outcomes with microlumbar discectomy. In 1987, Maroon and Onik introduced percutaneous automated discectomy as a new minimally invasive way to remove lumbar discs and subsequently published extensively on this technique.
Sources: en.wikipedia.org
Most of the world's cocaine is produced in South America, particularly in the Andean region. The environmental destruction caused by the production of cocaine has been well documented, with reports made the UN and other government bodies. Due to the illegal nature of coca production, farmers make little effort in soil conservation and sustainability practices as seen in the high mobility and short life of coca plots in Colombia. One of the major implications of cocaine production is deforestation as large areas of forest are cleared for coca cultivation. The UNODC approximated that 97,622 hectares of primary forest were cleared for coca cultivation during 2001–2004 in the Andean region. This further causes habitat destruction, especially in biodiversity hotspots, areas rich in a variety of species. Such areas are chosen for coca cultivation due to their remote locations, minimising chances of detection. Deforestation impacts soil erosion which further inhibits the survival of native species. The use of pesticides can also severely affect the environment. Farmers are able to use unregulated and highly toxic pesticides due to the clandestine nature of drug production. The use of such pesticides can have both direct and indirect effects on the ecosystem. Where lethal levels of exposure directly cause the death of fauna, which is further carried up the food chain where secondary feeders who consume the poisoned animals are also impacted.
=== Medical diagnostics and treatments === Magnetic nanoparticles have been examined for use in an experimental cancer treatment called magnetic hyperthermia in which an alternating magnetic field (AMF) is used to heat the nanoparticles. To achieve sufficient magnetic nanoparticle heating, the AMF typically has a frequency between 100–500 kHz, although significant research has been done at lower frequencies as well as frequencies as high as 10 MHz, with the amplitude of the field usually between 8-16kAm−1. Affinity ligands such as epidermal growth factor (EGF), folic acid, aptamers, lectins etc. can be attached to the magnetic nanoparticle surface with the use of various chemistries. This enables targeting of magnetic nanoparticles to specific tissues or cells. This strategy is used in cancer research to target and treat tumors in combination with magnetic hyperthermia or nanoparticle-delivered cancer drugs. Despite research efforts, however, the accumulation of nanoparticles inside of cancer tumors of all types is sub-optimal, even with affinity ligands. Willhelm et al. conducted a broad analysis of nanoparticle delivery to tumors and concluded that the median amount of injected dose reaching a solid tumor is only 0.7%. The challenge of accumulating large amounts of nanoparticles inside of tumors is arguably the biggest obstacle facing nanomedicine in general. While direct injection is used in some cases, intravenous injection is most often preferred to obtain a good distribution of particles throughout the tumor.
Continuous ion sources (most commonly electrospray ionization, ESI) are generally interfaced to the TOF mass analyzer by "orthogonal extraction" in which ions introduced into the TOF mass analyzer are accelerated along the axis perpendicular to their initial direction of motion. Orthogonal acceleration combined with collisional ion cooling allows separating the ion production in the ion source and mass analysis. In this technique, very high resolution can be achieved for ions produced in MALDI or ESI sources. Before entering the orthogonal acceleration region or the pulser, the ions produced in continuous (ESI) or pulsed (MALDI) sources are focused (cooled) into a beam of 1–2 mm diameter by collisions with a residual gas in RF multipole guides. A system of electrostatic lenses mounted in high-vacuum region before the pulser makes the beam parallel to minimize its divergence in the direction of acceleration. The combination of ion collisional cooling and orthogonal acceleration TOF has provided significant increase in resolution of modern TOF MS from few hundred to several tens of thousand without compromising the sensitivity.
=== Breast cancer === Hormone antagonists are used widely in anticancer treatments, such as the drug tamoxifen, an anti-estrogen that binds to estrogen receptors to slow the growth of some estrogen receptor-positive breast cancers. Aromatase inhibitors (AIs) are also prescribed as a breast cancer treatment, especially after mastectomies. AIs work by blocking the action of the aromatase enzyme, which converts androgens, like testosterone, into estrogen. Aromatase inhibitors can be used in conjunction with estrogen receptor inhibitors to treat estrogen receptor-positive breast cancers in women who have gone through menopause already.
Gepirone, sold under the brand name Exxua, is a medication used for the treatment of major depressive disorder. It is taken orally. Side effects of gepirone include dizziness, nausea, insomnia, abdominal pain, and dyspepsia (indigestion). Gepirone acts as a partial agonist of the serotonin 5-HT1A receptor. An active metabolite of gepirone, 1-(2-pyrimidinyl)piperazine, is an α2-adrenergic receptor antagonist. Gepirone is a member of the azapirone group of compounds. Gepirone was synthesized by Bristol-Myers Squibb in 1986 and was developed and marketed by Fabre-Kramer Pharmaceuticals. It was approved for the treatment of major depressive disorder in the United States in September 2023. This came after the drug had been rejected by the Food and Drug Administration (FDA) three times over two decades due to insufficient evidence of effectiveness.
Sources: en.wikipedia.org
=== Occupational harm reduction strategies === Drug and alcohol impairment while at work increases the risk of work-place accidents and decreases productivity. Employers such as the commercial driving and airline industry may conduct random drug tests on employees with the goal of deterring use to improve safety. There is some evidence that increasing the use of random drug testing in the airline industry reduces the percentage of people who test positive, however, it is unclear if this decrease is associated with a corresponding decrease in fatal or non-fatal injuries, other accidents, number of days absent from work. It is also not clear if there are other unwanted side effects that may result from random drug and alcohol testing in the workplace.
Article 20 of the AFL–CIO constitution prohibits affiliates from raiding one another's members, and an affiliation with AFSCME would have won CSEA relief from the raids. But CSEA delegates formally barred their leaders from seeking an affiliation with AFSCME in March 1976. CSEA's contract with the state of New York expired in 1977. Although CSEA leaders once more proposed a strike, the union settled for a 14 percent pay raise in April 1977. Hardy, convinced SEIU could successfully raid CSEA, conducted secret polls which showed that deep unrest in the professional, scientific, and technical (PS&T) unit. Working only with the AFT, SEIU once more obtained enough petitions to challenge CSEA representation in the PS&T unit. The raid was successful, and the coalition (known as the Public Employees Federation) won, 15,062 to 12,259. Hardy and AFT leader Albert Shanker hoped to raid CSEA further, but CSEA affiliated with AFSMCE on April 21, 1978. The affiliation made AFSCME the largest affiliate in the AFL–CIO. CSEA challenged the SEIU/AFT coalition's victory, however. CSEA attorneys alleged that nearly 5,000 of the signatures on the petition forcing an election were fraudulent. A New York Supreme Court (the state's trial court of general jurisdiction) initially dismissed the suit, but it was reinstated by a state appellate court. As the lawsuit progressed, CSEA won a new three-year contract which included a 7 percent pay hike in the first year.
However, β-strands are rarely perfectly extended; rather, they exhibit a twist. The energetically preferred dihedral angles near (φ, ψ) = (–135°, 135°) (broadly, the upper left region of the Ramachandran plot) diverge significantly from the fully extended conformation (φ, ψ) = (–180°, 180°). The twist is often associated with alternating fluctuations in the dihedral angles to prevent the individual β-strands in a larger sheet from splaying apart. A good example of a strongly twisted β-hairpin can be seen in the protein BPTI. The side chains point outwards from the folds of the pleats, roughly perpendicularly to the plane of the sheet; successive amino acid residues point outwards on alternating faces of the sheet.
=== X-ray spectrometer === The most practical application of 244Cm—though rather limited in total volume—is as an α-particle source in alpha particle X-ray spectrometers (APXS). These instruments were installed on the Sojourner, Mars, Mars 96, Mars Exploration Rovers and Philae comet lander, as well as the Mars Science Laboratory to analyze the composition and structure of the rocks on the surface of planet Mars. APXS was also used in the Surveyor 5–7 moon probes but with a 242Cm source. An elaborate APXS setup has a sensor head containing six curium sources with a total decay rate of several tens of millicuries (roughly one gigabecquerel). The sources are collimated on a sample, and the energy spectra of the alpha particles and protons scattered from the sample are analyzed (proton analysis is done only in some spectrometers). These spectra contain quantitative information on all major elements in the sample except for hydrogen, helium and lithium.
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.
Creatine monohydrate is the hydrated solid form of creatine, a nitrogen-containing compound involved in cellular energy metabolism. It consists of one creatine molecule associated with one water molecule in a crystal lattice.