If you have been reading about Karl Fischer titration and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-03-24. Numbers and descriptions here follow the published literature rather than marketing material.
Dry creatine monohydrate is generally stable when kept sealed and protected from heat and moisture. In solution, however, creatine undergoes a slow cyclization to creatinine, a related compound with no role in phosphocreatine storage. The rate of this conversion increases with temperature and is influenced by pH. Because creatinine is a common impurity in liquid or poorly stored products, analytical testing often measures both compounds. The crystalline monohydrate is less prone to degradation than aqueous preparations, though caking can occur if moisture enters the container.
Laboratory analysis of creatine monohydrate typically uses high-performance liquid chromatography to separate creatine from creatinine and other impurities. Detection may be ultraviolet, refractive index, or mass spectrometric, depending on the laboratory's equipment and the required sensitivity. Nuclear magnetic resonance spectroscopy can quantify the main component and identify related substances. Water content is measured by Karl Fischer titration, which is important because the monohydrate has a defined theoretical hydration level. Heavy metals, residual solvents, and microbial limits are also checked in quality control programs.
Commercial creatine monohydrate is produced mainly by chemical synthesis rather than extraction from animal tissue. Suppliers provide a certificate of analysis listing assay, water content, and impurity limits, and some products undergo third-party testing. Verification of identity can use infrared or Raman spectroscopy alongside chromatographic methods. Storage recommendations generally call for a cool, dry place and a tightly closed container to limit moisture uptake. Open questions include how packaging, flavoring agents, and long-term storage affect the stability of finished products.
Analytical laboratories commonly use high-performance liquid chromatography to separate creatine from creatinine and related impurities. Ion chromatography, nuclear magnetic resonance, and titration assays can also quantify the compound. Water content is measured by Karl Fischer titration or loss on drying, because the monohydrate has a defined theoretical water fraction. Particle size, bulk density, and flowability are physical properties that affect blending and capsule filling. These measurements support quality control and help verify that a lot matches its specification.
Regulatory status varies by country. In the United States, creatine monohydrate is sold as a dietary supplement ingredient, while in the European Union it is placed on the market as a food supplement component. Some jurisdictions have established purity monographs or permitted health claims, while others treat it as a novel food or require notification. Product labels may state the amount of creatine monohydrate or the equivalent creatine content, and the two figures can differ. Independent testing programs sometimes check identity, potency, and contaminant limits.
| Property | Value | Notes |
|---|---|---|
| Typical storage temperature | 15–25 °C | Protect from moisture, heat, and direct sunlight |
| Analytical method | HPLC with UV or RI detection | Separates creatine from creatinine and related impurities |
| Water content | About 12.1% w/w | Theoretical value for the monohydrate crystal |
| Degradation product | Creatinine | Formed by cyclization, especially in aqueous solution |
| Common assay specification | 98.0–102.0% | Range depends on the testing method and monograph |
The term creatine monohydrate is often shortened to creatine in casual usage, though other creatine forms exist, including citrate, nitrate, and hydrochloride salts. These alternative forms differ in solubility, pH behavior, and the amount of creatine delivered per unit mass. Regulatory categories vary by country: some jurisdictions treat it as a food ingredient, while others place it under supplement or drug frameworks depending on claims and presentation. Standard reference texts list it as a naturally occurring nitrogenous organic acid rather than a vitamin or mineral.
Creatine monohydrate is a crystalline organic compound formed from creatine and water in a one-to-one ratio. It belongs to the guanidino family and contains a methylated guanidine group attached to an acetate-like chain. The solid is commonly described as a white, odorless powder with a mildly bitter taste. Its molecular formula is C4H11N3O3·H2O, and the hydrated form is the most widely traded grade. The compound occurs naturally in vertebrate muscle and brain tissue, where it participates in rapid energy buffering.
In aqueous solution, creatine monohydrate exists mainly as a zwitterion, carrying both a positive guanidinium charge and a negative carboxylate charge. This charge separation raises water solubility relative to many neutral organic solids and helps explain its behavior in analytical separations. The monohydrate can lose its water of crystallization under sustained heat or low humidity, converting toward anhydrous creatine. Such transitions matter for mass balance calculations because the hydrate contributes water mass that is not part of the active creatine molecule.
In the body, creatine is synthesized from arginine, glycine, and methionine, mainly in the liver and kidneys, and is also obtained from foods such as meat and fish. About 95% of body creatine is stored in skeletal muscle, where a fraction is phosphorylated to phosphocreatine. Phosphocreatine serves as a rapid reserve of high-energy phosphate for short bursts of ATP regeneration. The monohydrate form supplies creatine after dissolution and absorption, but it is not itself the active phosphorylated species.
Creatine was first identified in skeletal muscle extracts in the nineteenth century, and its role in phosphagen energy buffering was clarified in the twentieth century. The monohydrate salt became widely studied after methods for inexpensive synthesis and crystallization were developed. Modern research examines its effects on muscle energetics, recovery, and cognitive performance under specific conditions. Findings vary with population, exercise protocol, baseline creatine status, and measurement method. Studies often compare supplementation with placebo during controlled training or testing schedules.
Several creatine forms are sold, including monohydrate, anhydrous, hydrochloride, nitrate, citrate, and blends. Once dissolved, these forms deliver creatine, but they differ in molar mass, solubility, counterions, and water content. Creatine monohydrate has the largest body of published human data among these forms. Questions remain about whether any alternative form offers meaningful advantages in absorption, tolerability, or tissue uptake under practical conditions. The hydrate form's lower creatine content by mass is a compositional fact, not a statement about effectiveness.
Creatine monohydrate is a crystalline compound formed when one molecule of creatine associates with one molecule of water in the solid lattice. Its molecular formula is C4H11N3O3, and its molar mass is about 149.15 grams per mole. The material appears as a white, odorless powder that dissolves sparingly in water at room temperature. The monohydrate designation distinguishes it from anhydrous creatine, which lacks the bound water and has a lower molar mass. This hydrate is the most common commercial form of creatine used in nutritional and research settings.
=== Bank buildings === The Bowery Savings Bank was chartered in May 1834, when the Bowery was an upscale residential street, and grew with the rising prosperity of the city. Its 1893 headquarters building at 130 Bowery is an official New York City designated landmark, as is the 1920s domed Citizens Savings Bank.
=== Other uses === Rhodium is used as an alloying agent for hardening and improving the corrosion resistance of platinum and palladium. These alloys are used in furnace windings, bushings for glass fiber production, thermocouple elements, electrodes for aircraft spark plugs, and laboratory crucibles. Other uses include electrical contacts, where it is valued for small electrical resistance, small and stable contact resistance, and great corrosion resistance, and filters and anodes in mammography systems that emit a lower radiation dose than comparable systems using molybdenum. Rhodium plated by either electroplating or evaporation is extremely hard and useful for optical instruments. In automobile manufacturing, rhodium is also used in the construction of headlight reflectors. Rhodium neutron detectors are used in nuclear reactors to measure neutron flux levels—this method requires a digital filter to determine the current neutron flux level, generating three separate signals: immediate, a few seconds delay, and a minute delay, each with its own signal level; all three are combined in the rhodium detector signal. The three Palo Verde nuclear reactors each have 305 rhodium neutron detectors, 61 detectors on each of five vertical levels, providing an accurate 3D "picture" of reactivity and allowing fine tuning to consume the nuclear fuel most economically.
UNC Rex Hospital is a general hospital located in Raleigh, North Carolina. It is the capital city's oldest hospital, founded by a bequest from John T. Rex (1771–1839), a local tanner, planter, and owner of enslaved families, and named in his honor. Originally located on what is now Dorothea Dix campus, and later on St. Mary's Street, Rex is now located in west Raleigh at the corner of Blue Ridge Road and Lake Boone Trail. Rex Health Care's services include oncology, heart and vascular, surgical services (including bariatric, heartburn, GI, orthopedic, neuro, and spinal), rehabilitation, emergency department, urgent care, women's services, and wound healing. Rex is a member of the UNC Health Care system, a non-profit integrated health care system, owned by the state of North Carolina and based in Chapel Hill, North Carolina. Rex is located just 2 miles from the Lenovo Center, and is the official healthcare provider of the Carolina Hurricanes and NC State Wolfpack.
=== Combined malonic and methylmalonic aciduria (CMAMMA) === In combined malonic and methylmalonic aciduria (CMAMMA), mutations in the ACSF3 gene impair the mitochondrial enzyme acyl-CoA synthetase family member 3 (ACSF3), disrupting the conversion of methylmalonic acid to methylmalonyl-CoA and its entry into the citric acid cycle. This leads to accumulation of methylmalonic acid, reduced methylmalonyl-CoA levels and decreased lysine methylmalonylation compared to healthy controls.
Sources: en.wikipedia.org
Business biomimetics is the latest development in the application of biomimetics. Specifically it applies principles and practice from biological systems to business strategy, process, organization design, and strategic thinking. It has been successfully used by a range of industries in FMCG, defense, central government, packaging, and business services. Based on the work by Phil Richardson at the University of Bath the approach was launched at the House of Lords in May 2009. Generally, biometrics is used as a creativity technique that studies biological prototypes to get ideas for engineering solutions. In chemistry, a biomimetic synthesis is a chemical synthesis inspired by biochemical processes. Another, more recent meaning of the term bionics refers to merging organism and machine. This approach results in a hybrid system combining biological and engineering parts, which can also be referred as a cybernetic organism (cyborg). Practical realization of this was demonstrated in Kevin Warwick's implant experiments bringing about ultrasound input via his own nervous system.
Auto-oxidation reaction is also observed with common ethers, such as diethyl ether, diisopropyl ether, tetrahydrofuran, and 1,4-dioxane. An illustrative product is diethyl ether peroxide. Such compounds can result in a serious explosion when distilled. To minimize this problem, commercial samples of THF are often inhibited with butylated hydroxytoluene (BHT). Distillation of THF to dryness is avoided because the explosive peroxides concentrate in the residue. Although ether hydroperoxide often form adventitiously (i.e. autoxidation), they can be prepared in high yield by the acid-catalyzed addition of hydrogen peroxide to vinyl ethers: C2H5OCH=CH2 + H2O2 → C2H5OCH(OOH)CH3 Many industrial peroxides are produced using hydrogen peroxide. Reactions with aldehydes and ketones yield a series of compounds depending on conditions. Specific reactions include addition of hydrogen peroxide across the C=O double bond: R2C=O + H2O2 → R2C(OH)OOH In some cases, these hydroperoxides convert to give cyclic diperoxides:
There are 20 known isotopes of fermium, with atomic weights of 241 to 260, of which 257Fm is the longest-lived with a half-life of 100.5 days. Other isotopes are considerably shorter: 253Fm has a half-life of 3 days, 252Fm of 25.4 h, 255Fm of 20.1 h, while 251Fm of 5.3 h, 254Fm of 3.2 h, and 256Fm of 2.67 hours. All the remaining ones have half-lives ranging from 30 minutes to less than a millisecond. The neutron capture product of fermium-257, 258Fm, undergoes spontaneous fission with a half-life of just 370(14) microseconds; 259Fm and 260Fm also undergo spontaneous fission (t1/2 = 1.5(3) s and 4 ms respectively). This means that neutron capture does not create nuclides with a mass number greater than 257, unless carried out at extremely high flux, as in a nuclear explosion (or the astrophysical r-process), since no accessible fermium isotopes undergo beta minus decay to the next element, mendelevium. Because of this impediment in forming heavier isotopes, these short-lived isotopes 258–260Fm constitute the "fermium gap." Deliberate attempts at nuclear explosion synthesis, however, also failed to create heavier nuclei, and as a result were deemed not worth continuing.
=== November === 1 November Amid an ongoing boom in artificial intelligence, the UK hosts the world's first international summit devoted to safely managing the technology. Computer simulations reveal that remnants of a protoplanet named Theia could be inside the Earth, left over from a giant collision in ancient times, which afterwards formed the Moon. Dinkinesh, previously thought to be a single asteroid, is revealed by NASA's Lucy probe to in fact be a binary pair. 5 November – A new record high efficiency of 33.9% is reported for a silicon-perovskite tandem solar cell. This also surpasses the Shockley-Quieser theoretical limit of 33.7% of single junction solar cells for the first time. 6 November – Scientists release the first connectome of neuropeptide signaling in an animal nervous system (C. elegans). On 1 November, a functional atlas of signal propagation in 23,433 pairs of neurons across the worm's head by direct optogenetic activation is published. On 17 November, the development of fluorescent neuropeptide sensors is reported. 7 November – A study finds that "catastrophic ecosystem collapse" of UK forests is likely within the next 50 years, due to a wide range of factors. 8 November – In 10 studies, researchers of the Sc2.0 project report yeast with a half-synthetic genome. 9 November – Surgeons report the first human eye transplant; the patient did not regain sight in the transplanted eye. 10 November – A new scalable technique for carbon nanotube-based MOSFETs is demonstrated.
===== Euarchontoglires ===== Order Lagomorpha Family Leporidae Oryctolagus cuniculus, European rabbit (2010) Order Primates Family Callitrichidae Callithrix jacchus, Common marmoset (2010, whole genome 2014) Family Cercopithecidae Macaca mulatta, rhesus macaque (2007 & Chinese rhesus macaque Macaca mulatta lasiota in 2011) Macaca fascicularis, Cynomolgus or crab-eating macaque (2011) Papio anubis, olive baboon (2020) Papio cynocephalus, yellow baboon (2016) Rhinopithecus roxellana, golden snub-nosed monkey (2019) Family Galagidae Otolemur garnettii, small-eared galago, or bushbaby () Family Hominidae Subfamily Ponginae Pongo pygmaeus/Pongo abelii, orangutan (Borneo/Sumatra) (2011) Subfamily Homininae Gorilla gorilla, western gorilla (2012) Homo sapiens, modern human (draft 2001, whole genome 2022) † Homo neanderthalensis, Neanderthal (draft 2010) Pan troglodytes, chimpanzee (2005) Pan paniscus, bonobo (2012) Order Rodentia Family Caviidae Hydrochoerus hydrochaeris, capybara (2018) Family Cricetidae Microtus montanus, Montane vole (2021) Microtus richardsoni, North American Water Vole (2021) Peromyscus leucopus, white-footed mouse (2019) Family Heteromyidae Perognathus longimembris pacificus, Pacific Pocket Mouse Family Muridae Mastomys coucha, Southern multimammate mouse (2019) Mus musculus Strain: C57BL/6J, House mouse (2002) Rattus norvegicus, Brown rat (2004)
Sources: en.wikipedia.org
== History == Frederick William Hope coined the term myiasis in 1840 to refer to diseases resulting from dipterous larvae as opposed to those caused by other insect larvae (the term for this was scholechiasis). Hope described several cases of myiasis from Jamaica caused by unknown larvae, one of which resulted in death. Even though the term myiasis was first used in 1840, such conditions have been known since ancient times. Ambroise Paré, the chief surgeon to King Charles IX and King Henry III, observed that maggots often infested open wounds.
Musicians of these decades, especially in jazz and folk music, were influenced by the shadow of nuclear war. Probably the most famous, passionate and influential of all was Bob Dylan, notably in his songs "Masters of War" and "A Hard Rain's a-Gonna Fall" (written just before the Cuban Missile Crisis). In 1965 Barry McGuire's version of P. F. Sloan's apocalyptic "Eve of Destruction" was a number one hit in the United States and elsewhere. Van Cliburn was a pianist who was celebrated with a ticker tape parade after winning a musical competition in the Soviet Union. From 1956 through the late 1970s, the US State Department sent its finest jazz musicians to show off music that appealed to youth, to demonstrate racial harmony at home, and to undergird freedom as jazz was a democratic music form, free flowing and improvised. Jazz tours of the Soviet Union were organized in 1956, and lasted through the 1970s. In addition to jazz, the US State Department also supported the performance of classical music by noteworthy American orchestras and soloists as part of its cultural diplomacy initiatives during the Cold War. During the 1950s, the bass-baritone William Warfield was recruited by the Department of State to perform in six separate European tours which featured productions of the opera Porgy and Bess . In 1961-1962 Howard Hanson's Eastman Philharmonia Orchestra at the Eastman School of Music was selected to represent the nation on an international concert tour which included thirty four cities and sixteen countries in Europe, the Middle East and Russia.
=== Abortion === In January 2025, Trump reinstated the Mexico City policy ("global gag rule"), which had been rescinded by the Biden administration. Since the 1980s, this rule has been put in place during Republican administrations and rescinded during Democratic administrations. In May 2025, in a case involving telehealth prescriptions and the abortion-drug Mifepristone, the Trump administration asked the court to dismiss the case, arguing that the states involve did not have standing. This case was Missouri v. FDA brought before federal judge Matthew Kacsmaryk in the Northern District of Texas. The states involved were Missouri, Idaho, and Kansas. In June 2025, the Centers for Medicare & Medicaid Services ended the rule which required hospitals to provide emergency abortions under the Emergency Medical Treatment and Active Labor Act. In October 2025, the Food and Drug Administration approved a generic version of the abortion pill mifepristone, allowing three U.S. companies to produce it and expanding access to medication abortion. The administration has not implemented major new restrictions on medication abortion, although Health and Human Services officials announced a review of mifepristone's safety in response to pressure from opponents.
Conduct distinctive, laboratory, clinical, behavioral, translational and population-based research that breaks new ground and defines scientific excellence Facilitate new approaches to improve health through prevention, early detection, diagnosis, and treatment by developing and/or using innovative technologies, approaches or devices Respond rapidly to critical public health needs Train the next generation of biomedical and behavioral researchers Foster sharing of information and dissemination of the IRP's major discoveries to the public through partnerships with academic institutions and industry
Sources: en.wikipedia.org
Purity testing often uses high-performance liquid chromatography to measure creatine and creatinine. Water content can be checked by Karl Fischer titration. Additional tests may cover heavy metals, residual solvents, and microbial contamination.
In solution, creatine can cyclize spontaneously to creatinine. Heat and certain pH conditions increase the rate of this conversion. Dry crystalline material is more stable because the reaction requires water.
Typical storage is in a sealed container at room temperature, away from moisture and direct heat. These conditions reduce caking and slow degradation. Liquid products require more careful handling because creatine is less stable in water.
A sealed container at room temperature, away from moisture and direct heat, is suitable for most solid material. Keeping the lid closed limits water uptake and caking. Long-term storage in a refrigerator is not necessary if the powder remains dry.