This is a working overview of creatinine, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-06-20 and is reviewed periodically as new material appears.
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.
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.
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.
| 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 |
A health professional who works directly with patients, or uses data from patients, to do research on health and disease and to develop new treatments. Clinical researchers may also do research on how health care practices affect health and disease. (NCI) Clinical series
national school-related group) SADL (a) Situation Awareness Data Link ("saddle") Structural Architecture Description Language SADT - (i) Substance Abuse Day Treatment SAE (i) Society of Automotive Engineers Stamped addressed envelope SAFER – (a) Steel And Foam Energy Reduction SAFETY – (a) Stopping Adults Facilitating the Exploitation of Today's Youth SAFICT – (a) Software Agents as Facilitators of Interoperability in Collective Training sag – (s) Sango language (ISO 639-2 code) SAG (a/i) Screen Actors Guild Surface Action Group SAG-AFTRA – (a) Screen Actors Guild–American Federation of Television and Radio Artists SAGAT – (a) Situation Awareness Global Assessment Technique SAGE – (a) Semi-Automatic Ground Environment (simulation) SAHB – (a) Sensational Alex Harvey Band SAIC – (i) Science Applications International Corporation SALT (a/i) Save A Life Today (SALT) Alert; Emergency Contact System (a) Southern African Large Telescope Strategic Arms Limitation Talks SAM (a) Sequential-Access Memory Sociedad Aeronáutica de Medellín Surface-to-Air Missile Sambo – (p/a) Samooborona bez oruzhiya (Russian: "Самооборона без оружия", literally "self-defense without weapons") SAML – (a) Security Assertion Markup Language ("sam-ell") SANZAAR – (a) South Africa, New Zealand, Australia and Argentina Rugby san (s) Sanskrit language (ISO 639-2 code) (a) Storage Area Network SAO - (more than 20 alternatives) SAR (s) Saudi riyal (ISO 4217 currency code) (a) Search And Rescue Special Administrative Region Synthetic Aperture Radar SARA (a) Southeastern Association for Research in Astronomy Scientific Atlanta Resident Application Scottish Amateur Rowing Association Southern African Railway Association State Administration for Religious Affairs SARP – (a) Search And Rescue Processor SARR – (i/a) Search And Rescue Repeater SARS – (a) Severe Acute Respiratory Syndrome SART (a) Search and Rescue Transponder Situational Awareness Rating Technique SARU – (i) South African Rugby Union SAS (i) Scandinavian Airlines System Second Avenue Subway Situational Awareness System Special Air Service Studies, Analysis and Simulation Side Angle Side (a) Statistical Analysis System (original meaning; SAS Institute Inc. has evolved far beyond that scope) SASE – (i) Self-Addressed Stamped Envelope SASO – (a) Stability and Support Operations SASOL – (p) Suid Afrikaanse Steenkool en Oli.e. (Afrikaans, "South African Coal and Oil") SAT (i) formerly Scholastic Aptitude Test and Scholastic Assessment Test; now known solely by the initials Small Arms Trainer SATB – (i) Soprano Alto Tenor bass SATNAV – (p) Satellite Navigation (Increasingly common GPS based system in new vehicles) SATs – (a) Standard Assessment Tasks and other similar terms describing tests used in English schools; see National Curriculum assessment#Terminology SAU – (s) Saudi Arabia (ISO 3166 trigram) SAVAK – (a) Sazamane Etelaat va Amniate Kechvar (Iranian "Security and Intelligence Service") SAW (i) ṣallā -llāhu ʿalayhī (wa-ʾālihī) wa-sallama (Arabic: صَلَّىٰ ٱللَّٰهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ, "God bless him [and his family] and grant him peace"), an honorific suffix within Islam for Muhammad (a) Submerged arc welding Squad Automatic Weapon Surface acoustic wave SAWE – (a) Society of Allied Weight Engineers SAWS – (i) alternate form of the Islamic honorific suffix for Muhammad (see SAW)
=== Independent bottlers === Most malt distilleries sell a significant amount of whisky by the cask for blending, and sometimes to private buyers as well. Whisky from such casks is sometimes bottled as a single malt by independent bottling firms such as Duncan Taylor, Master of Malt, Gordon & MacPhail, Cadenhead's, The Scotch Malt Whisky Society, Murray McDavid, Berry Bros. & Rudd, Douglas Laing, Adelphi and others. These are usually labelled with the distillery's name, but not using the distillery's trademarked logos or typefaces. An "official bottling" (or "proprietary bottling"), by comparison, is from the distillery (or its owner). Many independent bottlings are from single casks, and they may sometimes be very different from an official bottling. For a variety of reasons, some independent bottlers do not identify which distillery produced the whisky in the bottle. Mostly this will be at the request of the whisky distiller as they are unable to regulate the quality of the whisky sold. Some distilleries, to prevent third-party bottlers from naming them on the bottle, add a small amount of whisky from a different distillery, a technique called 'tea-spooning' which then precludes the sale of the whisky as from a specific distillery, or as a single malt; the addition of any whisky from a second distillery is by regulation a blended malt (which will also allow it to be exported in bulk form, unlike single malts which may only be exported bottled ready for sale).
=== Sources === Kosak, Dave (April 1, 2001). "Action Half-Life: Behind the Scenes". GameSpy. Retrieved 2017-07-04. Smith, Quintin (May 29, 2008). "3 – 2 – 1… Action Half-life". Rock, Paper, Shotgun. Retrieved 2017-07-04. Meer, Alec (June 8, 2009). "Action Half-Life 2: The Sauce Of Death". Rock, Paper, Shotgun. Retrieved 2017-07-04. Smith, Quintin (March 31, 2010). "Action Half-Life: The 5 a.m." Rock, Paper, Shotgun. Retrieved 2017-07-04. Smith, Quintin (May 23, 2011). "Stop, Drop, Roll: Action Half-Life 2 V2 Out". Rock, Paper, Shotgun. Retrieved 2017-07-04. Smith, Graham (May 8, 2014). "Total Converts: Unpotting The History Of Half-Life Modding". Rock, Paper, Shotgun. Retrieved 2017-07-04.
Sources: en.wikipedia.org
The island is known for using geothermal energy to provide electricity for its inhabitants. In San Carlos, Negros Occidental where energy company San Carlos Solar Energy (SaCaSol) is located, solar energy is being used to power the city and surrounding municipalities. Inland towns and cities of Negros uses hydroelectric power acquired from springs, rivers and waterfalls. Due to the island region's sugarcane-based agriculture, Negros may become the nation's major biofuel producer, with sugarcane being used for ethanol production.
P2Y12 is a chemoreceptor for adenosine diphosphate (ADP) that belongs to the Gi class of a group of G protein-coupled (GPCR) purinergic receptors. This P2Y receptor family has several receptor subtypes with different pharmacological selectivity, which overlaps in some cases, for various adenosine and uridine nucleotides. The P2Y12 receptor is involved in platelet aggregation and is thus a biological target for the treatment of thromboembolisms and other clotting disorders. Two transcript variants encoding the same isoform have been identified for this gene. In the field of purinergic signaling, the P2Y12 protein on the periphery is found mainly but not exclusively on the surface of blood platelets, and is an important regulator in blood clotting. In the central nervous system, this receptor has been found expressed exclusively on microglia, where it is necessary for physiological and pathological microglial actions, such as monitoring neuronal functions and microglial neuroprotection.
Data from the Office for National Statistics indicates that the average annual increase in employee earnings (excluding bonuses) was 6.2%, using data from the final three months of 2023. 14 February Office for National Statistics data shows that UK inflation remained at 4% in January 2024, despite a slight fall in food prices and a rise in energy prices. Train drivers' union ASLEF announces that drivers at five train operators – Chiltern, c2c, East Midlands, Northern and TransPennine – have voted for a further six months of industrial action. Food delivery drivers with companies including Uber Eats, Just Eat and Deliveroo stage a five-hour strike between 5pm and 10pm over pay and conditions. 15 February The UK is confirmed to be in a recession, after the economy shrank by 0.3% between October and December, having already contracted between July and September 2023. The new names of London's six Overground lines are revealed, with significant changes to the look of the famous Tube map set to take place. From September the six lines will be known as Lioness, Mildmay, Windrush, Weaver, Suffragette and Liberty. 16 February 2024 Wellingborough by-election: Labour's Gen Kitchen takes the Conservative Peter Bone's former seat, which he had held with a majority of more than 18,000. The swing of 28.5% is the second largest swing from Conservative to Labour at a by-election since the Second World War. 2024 Kingswood by-election: Labour's Damien Egan overturns an 11,220 Conservative majority to win Conservative Chris Skidmore's former seat.
This property has been utilized in synthetic organic chemistry. Selones (R2C=Se) are the selenium analogues of ketones. They are rare due to their tendency to oligomerize. Diselenobenzoquinone is stable as a metal complex. Selenourea is an example of a stable compound containing a (formal) C=Se bond. Thioselenides (R−Se−S−R), compounds with bonds between divalent selenium and divalent sulfur, analogous to disulfides. Likewise a selenamide has form R–Se–NR2. The latter are generally stable if and only if at least one of the nitrogen or the selenium is attached to an electron-withdrawing group. Per Paulmier, "hexacoordinated selenium does not appear in organic chemistry."
14 April – Trixie Gardner, Baroness Gardner of Parkes, 96, British politician, member of the House of Lords since 1981 20 April – Doreen Massey, Baroness Massey of Darwen, 85, British politician, member of the House of Lords (since 1999). 23 April – Frank Field, Baron Field of Birkenhead, 81, British politician, MP (1979–2019) and member of the House of Lords (since 2020). David Marquand, 89, British politician and academic administrator, MP (1966–1977) and principal of Mansfield College, Oxford (1996–2002). 29 April – Andrew Stunell, Baron Stunell, 81, British politician, MP (1997–2015) and member of the House of Lords (since 2015). 10 May – Colin Breed, 76, British politician, MP (1997–2010). (death announced on this date) 12 May – Michael Brudenell-Bruce, 8th Marquess of Ailesbury, 98, British hereditary peer, army officer and stockbroker, member of the House of Lords (1974–1999). 24 May – Stuart Borrowman, 71, Scottish politician. 5 June – Charles Allsopp, 6th Baron Hindlip, 83, British peer and businessman, member of the House of Lords (1993–1999). 26 June – Richard Taylor, 89, British politician, MP (2001–2010). 29 July – Robert Fellowes, Baron Fellowes, 82, British courtier, private secretary to the sovereign (1990–1999) and member of the House of Lords (1999–2022). Peter Reddaway, 84, British-American political scientist. 4 August – Anthony Hamilton-Smith, 3rd Baron Colwyn, 82, British dentist and peer, member of the House of Lords (1967–2022). 22 August – Delwyn Williams, 85, British politician and solicitor, MP (1979–1983).
Sources: en.wikipedia.org
== History == Tentatively called "radium F", polonium was discovered by Marie and Pierre Curie in July 1898, and was named after Marie Curie's native land of Poland (Latin: Polonia). Poland at the time was under Russian, German, and Austro-Hungarian partition, and did not exist as an independent country. It was Curie's hope that naming the element after her native land would publicize its lack of independence. Polonium may be the first element named to highlight a political controversy. This element was the first one discovered by the Curies while they were investigating the cause of pitchblende radioactivity. Pitchblende, after removal of the radioactive elements uranium and thorium, was more radioactive than the uranium and thorium combined. This spurred the Curies to search for additional radioactive elements. They first separated out polonium from pitchblende in July 1898, and five months later, also isolated radium. German scientist Willy Marckwald successfully isolated 3 milligrams of polonium in 1902, though at the time he believed it was a new element, which he dubbed "radio-tellurium", and it was not until 1905 that it was demonstrated to be the same as polonium. In the United States, polonium was produced as part of the Manhattan Project's Dayton Project during World War II. Polonium and beryllium were the key ingredients of the 'Urchin' initiator at the center of the bomb's spherical pit. 'Urchin' initiated the nuclear chain reaction at the moment of prompt-criticality to ensure that the weapon did not fizzle. 'Urchin' was used in early U.S.
Indirect sympathomimetics such as ephedrine are generally avoided or used only cautiously because they may raise blood pressure. Methylphenidate should be distinguished from amphetamines because it is primarily a dopamine reuptake inhibitor rather than a monoamine releaser. Modern guidance lists methylphenidate, modafinil, and bupropion among augmenting agents that can be combined with MAOIs using a low test dose, slow dose increases, and monitoring. A review of stimulant–MAOI combinations found no documented reports of hypertensive crises or fatalities when stimulants were cautiously added to an MAOI. Other relative contraindications or situations requiring special caution include uncontrolled hypertension or hypotension, diabetes mellitus, pregnancy, breastfeeding, bipolar disorder without mood-stabilizing treatment, and lack of recent health assessment.
List of British Jewish writers includes writers (novelists, poets, playwrights, journalists, authors of scholarly texts and others) from the United Kingdom and its predecessor states who are or were Jewish or of Jewish descent.
Planar cell polarity (PCP) is a type of cell polarity in which the cells are oriented in a coordinated way across the plane of an epithelial tissue. The orientation is controlled by different cytoplasmic and transmembrane proteins concentrating on two opposite ends of the cells and forming dimers between neighboring cells. Common examples of PCP oriented tissue include animal fur, bird feathers, fish scales, wings of a fruit fly, and stereocilia in the inner ear. PCP also plays a major role in other biological processes, such as wound healing and embryonic development.
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.
Yes, especially when exposed to moisture or heat, where it converts to creatinine. In dry, sealed containers at room temperature, degradation is slow and the product may remain within specification for two to three years.