This is a working overview of FTIR spectroscopy, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-01-19. Anything still debated is marked as such rather than presented as settled.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C4H9N3O2·H2O | Monohydrate includes one water molecule per creatine molecule |
| Molar mass | 149.15 g/mol | Value for the monohydrate; anhydrous creatine is about 131.13 g/mol |
| Appearance | White crystalline powder | Odorless or nearly odorless in purified form |
| Solubility in water | About 13 g/L at 25 °C | Solubility increases with temperature and varies with pH |
| Common synonyms | Creatine hydrate; N-(aminoiminomethyl)-N-methylglycine | Monohydrate distinguishes it from anhydrous creatine |
Quality control for creatine monohydrate typically combines identity, assay, and impurity tests. High-performance liquid chromatography with ultraviolet detection is common for separating creatine from creatinine and related substances. Nuclear magnetic resonance and infrared spectroscopy can confirm molecular structure, while titration may assess acid-base content. Moisture content, heavy metals, residual solvents, and microbial limits are checked according to applicable standards. These tests help distinguish compliant material from powders that have degraded, been diluted, or contain manufacturing residues.
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.
=== all-α === All-α proteins are a class of structural domains in which the secondary structure is composed entirely of α-helices, with the possible exception of a few isolated β-sheets on the periphery. Common examples include the bromodomain, the globin fold and the homeobox.
==== South Africa ==== Codeine is available over the counter in South Africa. Certain pharmacies require people to write down their name and address to ensure they are not buying too much over a short period although many do not require this at all. According to Lochan Naidoo, the former president of the National Narcotics Control Board, making the drugs more difficult to obtain could lead to even worse problems where people in withdrawal would turn to illicit drugs to get their fix.
The smallpox vaccine has also proven useful in preventing emergent infectious diseases caused by closely-related orthopoxviruses such as Mpox. Three specific smallpox vaccines have been approved in at least one country for Mpox prevention: MVA-BN, LC16m8, and ACAM2000. The Mpox vaccine is on the World Health Organization's List of Essential Medicines.
Sources: en.wikipedia.org
==== Radical site-initiated fragmentation ==== Sigma bond cleavage also occurs on radical cations remote from the site of ionization. This is commonly observed in alcohols, ethers, ketones, esters, amines, alkenes, and aromatic compounds with a carbon attached to ring. The cation has a radical on a heteroatom or an unsaturated functional group. The driving force of fragmentation is the strong tendency of the radical ion for electron pairing. Cleavage occurs when the radical and an odd electron from the bonds adjacent to the radical migrate to form a bond between the alpha carbon and either the heteroatom or the unsaturated functional group. The sigma bond breaks; hence this cleavage is also known as homolytic bond cleavage or α-cleavage.
=== Farm use === In order to reduce humidity levels and spoiling due to bacterial growth, refrigeration is used for meat, produce, and dairy processing in farming today. Refrigeration systems are used the heaviest in the warmer months for farming produce, which must be cooled as soon as possible in order to meet quality standards and increase the shelf life. Meanwhile, dairy farms refrigerate milk year round to avoid spoiling.
=== Comparison to other formulations === Adderall is one of several formulations of pharmaceutical amphetamine, including singular or mixed enantiomers and as an enantiomer prodrug. The table below compares these medications (based on US-approved forms):
Because of its spread with humans worldwide, there has been some uncertainty about its exact original, native range, although it has been recognized as being likely in the subtropical parts of the Afro-Eurasia, thus with a preference for warmer climates, and recent authorities regards it as only native to Asia. As a synanthropic species, Pholcus phalangioides has largely had its modern geographic distribution determined by the spread of humans around the world. Today, these spiders can be found in most of the temperate countries of every continent in the world. P. phalangioides are not suited for survival in cold environments, which is why they prefer the warmth of the indoors when in these regions, specifically inside human dwellings. These spiders have a particular affinity for dimly lit, dark areas that are quiet and calm. They are commonly found in the corners of buildings and people's homes as well as in attics. Populations of Pholcus phalangioides living outdoors can be found in caves and in between rock crevices.
Sources: en.wikipedia.org
SeV can replicate to high titers in human monocyte-derived DCs. With the multiplicity of infection of 2, approximately 1/3 of the DCs begin to express encoded SeV proteins 8 hours after infection. This proportion increases to 2/3, 24 hours and decreases to 1/3, 48 hours after infection. SeV demonstrates high cytopathic effect on DCs; the virus can kill a third of DC even with a very low multiplicity of infection such as 0.5. Most important observation is that SeV infection triggers DC maturation, which is manifested in DC cell surface markers composition. The virus increases the expression of class I and class II molecules of the major histocompatibility complex (MHC) (HLA-A, HLA-B, HLA-C and HLADR), CD83, as well as costimulatory molecules CD40 and CD86.
Histologic evidence of acantholysis (loss of intercellular connections leading to breaking apart of the skin; lesion) Direct immunofluorescence showing intercellular and basement membrane staining Indirect immunofluorescence staining with rat bladder epithelium
A&W entered the mainland Chinese market in 1996, the franchisee for the country being Aidewei, and had eight restaurants in Beijing. Later, due to arrears of franchise fees since 2000, Aidewei lost the A&W trademark in 2002. The eight restaurants weren't operating well and were plagued by mismanagement. An outlet in Yansha with 140 seats in a crowded, strategic location turned out to have limited business, while the restaurant in Anzhen had few customers. Following the buyout of the parent chain by Yum! Brands in 2002, it was announced in March 2003 that negotiations with Aidewei had broken down, leading to the franchisee's bankruptcy that same year. The restaurants closed successively from October 2002 to September 2003. The "father of American fast food", as dubbed by the Chinese press, didn't convince the local culture and tastes, especially with the rise of local fast food. There were also concerns about the Chinese branch operating without authorization, refusing to pay franchise fees since September 2000. In 1997 a small A&W restaurant opened in Festivalgate in Osaka, offering standard A&W fare. The restaurant closed in 1999. The first Qatari restaurant opened on December 18, 1997 (Qatar's National Day) with Al-Muftah Group as the franchisee. There were also plans to open a second restaurant in the country, as well as two restaurants in Cairo and six more in the UAE during 1998. The fare was similar to most A&W restaurants, with the addition of local items.
Sources: en.wikipedia.org
It is a crystalline form of creatine that contains one water molecule per creatine molecule. The compound occurs naturally in muscle tissue and is also produced synthetically for research and consumer products. The monohydrate label describes the solid's hydration state.
Creatine monohydrate contains creatine, but the two terms are not strictly interchangeable. The monohydrate includes water in the crystal, while creatine refers to the base molecule. Other creatine forms pair the molecule with different acids or carriers.
Dietary creatine is found mainly in meat and fish. The human body also synthesizes creatine from amino acids in the liver, kidneys, and pancreas. The monohydrate powder used in products is manufactured rather than extracted directly from food.
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.