The short version of Karl Fischer titration fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-05-07. 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.
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.
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.
| 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 |
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.
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.
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.
Solid creatine monohydrate is generally stable when kept dry and protected from extremes of heat and humidity. In the presence of moisture, it can gradually convert to creatinine, a cyclic dehydration product that has little value for phosphocreatine synthesis. Elevated temperatures and acidic conditions accelerate this conversion in solution. Because the reaction is slow in cool, dry storage, typical shelf lives are measured in years rather than weeks. Packaging that limits moisture and oxygen exposure helps maintain purity.
Recommended storage usually involves a sealed container kept at room temperature, away from direct sunlight and moisture. High humidity can cause caking, which changes flow properties and may complicate accurate weighing. Repeated opening of containers exposes the powder to air and moisture, so smaller aliquots can reduce handling effects. Storage temperature ranges are not absolute requirements; they reflect conditions that slow degradation and preserve consistent physical characteristics. Clean, dry tools help prevent contamination during sampling.
Identity and purity are commonly assessed by high-performance liquid chromatography, often with ultraviolet detection, and by spectroscopic techniques such as infrared or nuclear magnetic resonance. These methods can distinguish creatine from creatinine and detect related impurities. Moisture content may be measured by Karl Fischer titration or loss on drying. Particle size, bulk density, and heavy metal limits are additional quality parameters. Not every product is tested by every method, so specifications depend on the intended use and regulatory framework.
== Legal == Anti-doping policies instituted by individual sporting governing bodies may conflict with local laws. A notable case includes the National Football League (NFL)'s inability to suspend players found with banned substances, after it was ruled by a federal court that local labor laws superseded the NFL's anti-doping regime. The challenge was supported by the National Football League Players Association. Athletes caught doping may be subject to penalties from their local, as well from the individual sporting, governing body. The legal status of anabolic steroids varies from country to country. Fighters found using performance-enhancing drugs in mixed martial arts competitions (e.g. the UFC) could face civil and/or criminal charges once Bill S-209 passes. Under certain circumstances, when athletes need to take a prohibited substance to treat a medical condition, therapeutic use exemptions may be granted.
In the 1960s, Ajinomoto began to diversify its production by securing alliances with international food companies, including the Kellogg Company in 1962, CPC International Inc. in 1963, and Best Foods Company Ltd. in 1964. Because of these partnerships, Ajinomoto began selling Kellogg's corn flakes and Knorr soup in Japan and created its own brand of mayonnaise. During this time period, Ajinomoto modified AJI-NO-MOTO's recipe by using amino acids from sugar cane instead of soybeans, which allowed the seasoning to be produced locally in the countries it was exported to, which reduced shipping costs for the company. Domestic production first began in Thailand in 1962, followed by the Philippines (previously established in 1958), Malaysia, Peru, Indonesia, and Brazil in subsequent years. By 1979, nearly half of all AJI-NO-MOTO was being produced outside of Japan. In the 1970s, Ajinomoto diversified further by launching a flavored seasoning called HON-DASHI in 1970 and producing frozen foods in 1972. In 1973 Ajinomoto and General Foods Inc. launched Ajinomoto General Foods Inc., a joint venture between the two companies that would sell instant coffee. In 1978, Ajinomoto launched a brand of Chinese seasonings under the brand name "Cook Do". In Asian and Latin American markets, Ajinomoto created new products for consumers, while the company primarily delivered its products to processed food manufacturers in Europe and the United States. During this era, the company also expanded into other product markets.
Torture and assassination of Gaddaffi – ABC News video U.S. Policy Towards Qaddafi from the Dean Peter Krogh Foreign Affairs Digital Archives Muammar Gaddafi collected news and commentary at Al Jazeera English The Muammar Gaddafi story at BBC Online Muammar Gaddafi collected news and commentary at The Guardian Muammar Gaddafi collected news and commentary at The New York Times 2009 UN Security council speech from Al jazeera (English) on YouTube
Sources: en.wikipedia.org
Aristotle says that the intellect (nous), the ability to think, has no bodily organ (in contrast with other psychological abilities, such as sense-perception and imagination). Aristotle distinguishes between two types of intellect. These are traditionally called the "passive intellect" and the "active (or agent) intellect". He says that the "active (or agent) intellect" is not mixed with the body and suggests that it can exist apart from it. Hence, scholars face the challenge of explaining the relationship between the intellect and the body in Aristotle. According to one interpretation, a person's ability to think (unlike his other psychological abilities) belongs to some incorporeal organ distinct from his body. This would amount to a form of dualism. However, according to some scholars, it would not be a full-fledged Cartesian dualism. This interpretation creates what Robert Pasnau has called the "mind-soul problem" within Aristotelian hylomorphism: if the intellect belongs to an entity distinct from the body, and the soul is the form of the body, then how is the intellect part of the soul? Another interpretation rests on the distinction between the passive intellect and the agent intellect. According to this interpretation, the passive intellect is a property of the body, while the agent intellect is a substance distinct from the body. Some proponents of this interpretation think that each person has his own agent intellect, which presumably separates from the body at death.
== Reproduction and life cycle == Most Hydras can reproduce sexually under certain conditions, though they typically choose to reproduce asexually instead. Unlike many members of the Hydrozoa, which alternate between the polyp form and the medusa form (the life stage where sexual reproduction occurs), Hydra never progress beyond the polyp phase in their life cycle. Instead, when food is plentiful, many Hydra opt to reproduce asexually by budding. A section of the body wall and an extension of the digestive cavity develop, creating a bud. The buds grow into miniature adults and break away when mature. When a Hydra is well fed, a new bud can form every two days. When conditions are harsh, often before winter or in poor feeding conditions, sexual reproduction then occurs in some Hydra. Either the ovaries or testes develop from interstitial cells of the epidermis, resulting in swellings in the body wall. The testes release free-swimming gametes into the water, and these can fertilize the egg in the ovary of another individual. The fertilized eggs secrete a tough outer coating, and, as the adult dies (due to starvation or cold), these resting eggs fall to the bottom of the lake or pond to await better conditions, whereupon they hatch into nymph Hydra. The male Hydra is typically smaller in size and bears 1 to 8 conical testes, while the female is larger and has 1 to 2 ovaries. Some Hydra species, like Hydra circumcincta and Hydra viridissima, are hermaphrodites and may produce both testes and ovaries at the same time.
==== Employee training ==== All employees whose jobs in health care facilities expose them to hazardous drugs must receive training. Training should include shipping and receiving personnel, housekeepers, pharmacists, assistants, and all individuals involved in the transportation and storage of antineoplastic drugs. These individuals should receive information and training to inform them of the hazards of the drugs present in their areas of work. They should be informed and trained on operations and procedures in their work areas where they can encounter hazards, different methods used to detect the presence of hazardous drugs and how the hazards are released, and the physical and health hazards of the drugs, including their reproductive and carcinogenic hazard potential. Additionally, they should be informed and trained on the measures they should take to avoid and protect themselves from these hazards. This information ought to be provided when health care workers come into contact with the drugs, that is, perform the initial assignment in a work area with hazardous drugs. Moreover, training should also be provided when new hazards emerge as well as when new drugs, procedures, or equipment are introduced.
In subsequent years, the business developed and Lonza was the first fine chemical company to enter into a strategic partnership with SKF. In a similar way, Fine Organics, UK became the supplier of the thioethyl-N'-methyl-2-nitro-1,1-ethenediamine moiety of ranitidine, the second H2 receptor antagonist, marketed as Zantac by Glaxo. Other pharmaceutical and agrochemical companies gradually followed suit and started outsourcing the procurement of fine chemicals. For example, F.I.S., Italy, partnered with Roche, Switzerland for custom manufacturing precursors of the benzodiazepine class of tranquilizers, such as Librium (chlordiazepoxide HCl) and Valium (diazepam). The growing complexity and potency of new pharmaceuticals and agrochemicals requiring production in multipurpose, instead of dedicated, plants and, more recently, the advent of biopharmaceuticals, has had a major impact on the demand for fine chemicals and the evolution of the fine chemical industry as a distinct entity. For many years, the life science industry continued considering captive production of the active ingredients of their drugs and agrochemicals as a core competency. Outsourcing was used only in exceptional cases, such as capacity shortfalls, processes requiring hazardous chemistry or new products, where uncertainties existed about the chance of a successful launch.
Sources: en.wikipedia.org
Sinosauropteryx was a small bipedal theropod, noted for its short arms, large first finger (thumbs), and long tail. The taxon includes some of the smallest known adult non-avian theropod specimens, with the holotype specimen measuring only 68 cm (27 in) in length, including the tail. However, this individual was relatively immature. The longest known specimen reaches up to 1.07 m (3.5 ft) in length, with an estimated weight of 0.55 kg (1.2 lb). A subsequent paper estimated its mass to be 0.99 kg (2.2 lb). Sinosauropteryx was anatomically similar to Compsognathus, differing from its European relatives in its proportions. The skull of Sinosauropteryx was 15% longer than its thigh bones, unlike in Compsognathus, where the skull and thigh bones are approximately equivalent in length. The arms of Sinosauropteryx (humerus and radius) were only 30% the length of its legs (thigh bone and shin), compared to 40% in Compsognathus. Additionally, Sinosauropteryx had several features unique among all other theropods. It had 64 vertebrae in its tail. This high number made its tail the longest relative to body length of any theropod. Its hands were long compared to its arms, about 84% to 91% of the length of the rest of the arm (humerus and radius), and half the length of the foot. The first and second digits were about the same length, with a large claw on the first digit. The first fingers were large, being both longer and thicker than either of the bones of the forearm.
the argyrophilic (silver staining) fibrous structures present in basement membranes histologically similar fibers present in developing connective tissue. The history of the reticulin silver stain is reviewed by Puchtler et al. (1978). The abstract of this paper says:
Monoclonal antibodies that can be used to block pro-inflammatory cytokines Antigen-specific immunotherapy which allows immune cells to specifically target the abnormal cells that cause autoimmune disease Co-stimulatory blockade that works to block the pathway that leads to the autoimmune response Regulatory T cell therapy that utilizes this special type of T cell to suppress the autoimmune response Thymoquinone, a compound found in the flower Nigella sativa, has been studied for potential in treating several autoimmune diseases due to its effects on inflammation.
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.
A sealed container kept at room temperature and away from moisture is typical. Heat and humidity promote conversion to creatinine and can reduce assay values. Long-term storage under dry conditions helps maintain the original crystalline form.