Creatinine raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-03-20. Anything still debated is marked as such rather than presented as settled.
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.
Creatine monohydrate is sold as a dietary ingredient in some countries and as a food supplement in others. Regulatory frameworks vary, so purity limits, labeling rules, and permitted claims are not globally uniform. In the United States, it falls under dietary supplement rules, whereas the European Union treats it as a food supplement ingredient. Pharmacopeial monographs, where they exist, can provide public quality standards, but not every product is required to meet them. Questions about long-term effects and patterns of use remain areas of active study rather than settled regulatory findings.
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.
In solid form, creatine monohydrate is relatively stable when kept dry and away from heat. Moisture and elevated temperatures promote cyclization into creatinine, a related compound with no role in the phosphagen system. Degradation accelerates in aqueous solution, where the conversion can occur within hours to days depending on pH and temperature. Manufacturers typically recommend storage in sealed containers at room temperature, with relative humidity below 50 percent. Long-term stability data for opened containers are limited.
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.
| Property | Value | Notes |
|---|---|---|
| Purity (typical) | ≥99% by HPLC | Supplement and pharmacopeial grades vary |
| Water content | ≈12.1% theoretical | Measured by Karl Fischer titration |
| Creatinine limit | Often ≤0.1% in pharmacopeial grade | Supplement specifications may differ |
| Storage conditions | 15–25 °C, low humidity | Away from heat and acidic environments |
| Common analytical methods | HPLC–UV, NMR, FTIR, Karl Fischer | Used for identity, assay, and water content |
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.
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.
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.
The UPMC Mercy South Side Outpatient Center, formerly UPMC South Side hospital, is a 209,000-square-foot (19,400 m2) urgent care and outpatient facility serving the South Side neighborhood of Pittsburgh. It is one of several UPMC outpatient medical facilities serving various communities throughout the region.
However, while LSD and salvinorin A may have comparative potencies, in the sense that both can produce their effects at low dosages, they are otherwise quite different. The two substances are not chemically similar or related, as salvinorin A is found naturally in a single plant while LSD is chemically semisynthesized from lysergamides like ergotamine. They are ingested in different ways and produce different effects, which manifest themselves over different timescales. For example, the effects of salvia when smoked typically last for only a few minutes as compared to LSD, whose effects can persist for 8 to 12 hours.
Historically, research on electrospun fibrous scaffolds dates back to at least the late 1980s when Simon showed that electrospinning could be used to produce nano- and submicron-scale fibrous scaffolds from polymer solutions specifically intended for use as in vitro cell and tissue substrates. This early use of electrospun lattices for cell culture and tissue engineering showed that various cell types would adhere to and proliferate upon polycarbonate fibers. It was noted that as opposed to the flattened morphology typically seen in 2D culture, cells grown on the electrospun fibers exhibited a more rounded 3-dimensional morphology generally observed of tissues in vivo.
Drying: Principles, Applications and Design. Gordon and Breach Science Publishers, New York. 448p. Walker, J.C.F., Butterfield, B.G., Langrish, T.A.G., Harris, J.M. and Uprichard, J.M. (1993). Primary Wood Processing. Chapman and Hall, London. 595p. Wise, L.E. and Jahn, E.C. (1952). Wood Chemistry. Vol 2. Reinhold Publishing Corp., New York. 1343p. Wu, Q. (1989). An Investigation of Some Problems in Drying of Tasmanian Eucalypt Timbers. M.Eng. Sc. Thesis, University of Tasmania. 237p.
The amount of UV radiation produced by the Sun means that the Earth would not be able to sustain life on dry land if most of that light were not filtered out by the atmosphere. UV light from the Sun at wavelengths shorter than approximately 300 nm is absorbed in the atmosphere, primarily by ozone and molecular oxygen, before it reaches the ground. However, UV (specifically, UVB) is also responsible for the formation of vitamin D in most land vertebrates, including humans. The UV spectrum, thus, has effects both beneficial and detrimental to life. The lower wavelength limit of the visible spectrum is conventionally taken as 400 nm. Although ultraviolet rays are not generally visible to humans, 400 nm is not a sharp cutoff, with shorter and shorter wavelengths becoming less and less visible in this range. Insects, birds, and some mammals can see near-UV (NUV), because they can see somewhat shorter wavelengths than what humans can see.
Sources: en.wikipedia.org
=== 2010–2012: SODMG, Mad Decent, various mixtapes === Beginning in 2011, Riff Raff began to be managed by OG Ron C (of Swishahouse fame) and moved to Los Angeles. Riff Raff then started releasing more music videos that furthered the artist's internet fame. Those include songs such as "Jose Canseco", and "Marc Jacobs". Then in mid-2011, Riff Raff signed to Soulja Boy's label S.O.D. Money Gang Inc. Riff Raff joined Soulja Boy's SODMG label before they met in person; no paperwork was ever signed. However, Riff Raff still wore the imprint's chain, got its logo tattooed, and again adjusted his stage name, this time to Riff Raff SODMG. They would remain affiliated for around a year, but the label did not push or pay Riff Raff, which would result in him leaving the label. Soulja Boy publicly called Riff Raff a "cokehead" following their split. Some time before the official split Riff Raff affiliated with producers such as Diplo and Harry Fraud, as well as with Queens rapper Action Bronson. The music video he released for his collaboration with Fraud and Bronson, "Bird on a Wire", hit the one million plays-mark in roughly two months. "Bird on a Wire" was listed as the 27th best song of 2012 by Complex Music. In early 2012 he would release music videos for the songs, "Larry Bird", "Time" and the Chief Keef collaboration "Cuz My Gear", among others. In April 2012, Riff Raff also announced a collaborative album with Diplo tentatively titled Jody Highroller with guests Skrillex, Usher, Soulja Boy, Gucci Mane, Mystikal and Rusko.
Family history (parent or sibling) Dyslipidemia (triglycerides > 200 mg/dL or HDL < 35 mg/dL) Overweight or obesity (body mass index > 25 kg/m2) History of gestational diabetes or infant born with birth weight greater than 9 lb (4 kg) High risk ethnic group (such as of being of African American, Hispanic, Native American, Asian American or Pacific Islander heritage) Hypertension (systolic blood pressure >140 mmHg or diastolic blood pressure > 90 mmHg) Prior fasting blood glucose > 99 mg/dL Known vascular disease Markers of insulin resistance (PCOS, acanthosis nigricans) The United States Preventative Services Task Force (USPSTF) recommends adults who are overweight/obese and aged 40–70 years old to get screened during visits to their regular physician. The American Diabetes Association (ADA) recommends normal testing repeated every three years and recommends a larger range of people get tested: anyone over the age of 45 regardless of risk; an adult of any age who is obese or overweight and has one or more risk factors, which includes hypertension, a first degree relative with diabetes, physical inactivity, high risk race/ethnicity, Asian Americans with BMI of ≥23 kg/m2, HDL < 35 mg/dL or TG > 250 mg/dL, women who have delivered child >9 lbs or with gestational diabetes, A1c ≥ 5.7%, impaired fasting glucose (IFG) or impaired glucose tolerance (IGT). In the UK, NICE guidelines suggest taking action to prevent diabetes for people with a body mass index (BMI) of 30.
Actin remains one of the most abundant proteins in all of Eukarya and is an enzyme (ATPase) that gradually hydrolyzes ATP. It exists in two forms within eukaryotic cells: globular or G-actin and filament/filamentous or F-actin. Globular actin is the monomeric form of the protein while the filamentous actin is a linear polymer of globular subunits. The assembly of filamentous actin arises as a result of weak, noncovalent interactions between G-actin and appears in the arrangement of a two-stranded asymmetrical helical polymer. The asymmetrical nature of F-actin allows for distinct binding specificities at each terminus. The terminus that presents an actin subunit with an exposed ATP binding site is commonly labeled the "(−) end". Whereas, the opposite end of the polymer that presents a cleft and lacks a free ATP binding site is referred to as the "(+) end". Additionally, the respective ends of the actin microfilament are often specified by their appearance under transmission electron microscopy during a technique known as "decoration", where the addition of myosin results in distinctive actin-myosin binding at each terminus. The terms "pointed end" and "barbed end" refer to the "(−) end" and "(+) end" respectively. Within the cell, the concentrations of G-actin and F-actin continuously fluctuate. The assembly and disassembly of F-actin is regularly known as "actin tread-milling". In this process, G-actin subunits primarily add to the "barbed end" of the filamentous polymer.
fkbB enzyme is responsible of allylmalonyl-CoA synthesis or possibly propionylmalonyl-CoA at C21, which it is an unusual step of general PKS 1. As mentioned, if two methoxymalonyl CoA molecules are substituted for two malonyl-CoA molecules, they will take place in module 7 and 8 (C13 and C15), and fkbA enzyme will enforce this process. After the last step (module 10) of PKS 1, one molecule of L-pipecolic acid formed from L-lysine and catalyzed through fkbL enzyme synthesizes with the molecule from the module 10. The process of L-pipecolic acid synthesis is NRPS enforced by fkbP enzyme. After synthesizing the entire subunits, the molecule is cyclized. After the cyclization, the pre-tacrolimus molecule goes through the post-synthase tailoring steps such as oxidation and S-adenosyl methionine. Particularly fkbM enzyme is responsible of alcohol methylation targeting the alcohol of DHCHC starter unit (Carbon number 31 depicted in brown), and fkbD enzyme is responsible of C9 (depicted in green). After these tailoring steps, the tacrolimus molecule becomes biologically active.
A hematoma, also spelled haematoma, or blood suffusion is a localized bleeding outside of blood vessels, due to either disease or trauma including injury or surgery and may involve blood continuing to seep from broken capillaries. A hematoma is benign and is initially in liquid form spread among the tissues including in sacs between tissues where it may coagulate and solidify before blood is reabsorbed into blood vessels. An ecchymosis is a hematoma of the skin larger than 10 mm. They may occur among and or within many areas such as skin and other organs, connective tissues, bone, joints and muscle. A collection of blood (or even a hemorrhage) may be aggravated by anticoagulant medication (blood thinner). Blood seepage and collection of blood may occur if heparin is given via an intramuscular route; to avoid this, heparin must be given intravenously or subcutaneously.
Sources: en.wikipedia.org
Sophia Hober (born 1965) is a Swedish researcher in biotechnology and professor at The Royal Institute of Technology (KTH) in Stockholm. Sophia Hober got her Master of Science in chemical engineering at KTH in 1989 and defended her doctorate in biochemistry in 1996. Since 2007, Hober is a professor of molecular biotechnology at KTH. During 2011–2015, Professor Hober served as dean at KTH and was part of the management team. Sophia Hober was elected member of the Royal Swedish Academy of Engineering Sciences in 2012. Hober's research is centered around the development of affinity proteins for use in biotechnology and medicine. Her main scientific achievements in the field of protein purification include improvements of the alkaline tolerance of protein A for the industrial purification of monoclonal antibodies. This work led to the product MabSelect SuRe, currently sold by Cytiva. Professor Hober has also developed a new protein domain with calcium-dependent affinity that can be used for gentle purification of monoclonal antibodies. Further in her work she has developed protein domains with the ability to strongly and selectively bind cancer markers. One of these has, in clinical trials, been shown to work very well for the precision diagnosis of cancer in situ. Hober is, among others, a co-founder of the biotechnology companies Affibody AB and Atlas Antibodies AB.
These increases are partially related to the COVID-19 pandemic, which continues to highlight the weaknesses of current food and health systems. It has contributed to food insecurity, increasing hunger worldwide; meanwhile, lower physical activity during lockdowns has contributed to increases in overweight and obesity. In 2020, experts estimated that by the end of the year, the pandemic could have double the number of people at risk of suffering acute hunger, around 130 million more undernourished people. Similarly, experts estimated that the prevalence of moderate and severe wasting could increase by 14% due to COVID-19; coupled with reductions in nutrition and health services coverage, this could result in over 128,000 additional deaths among children under 5 in 2020 alone. Although COVID-19 is less severe in children than in adults, the risk of severe disease increases with undernutrition. Other major causes of hunger include manmade conflicts, climate changes, and economic downturns.
The civil status records from 1860 to 1902 and the index of reconstructed records prior to 1860 (December 15, 2009). The ten-year tables of births, marriages, and deaths from 1903 to 1932; the annual tables of marriages from 1933 to 1939; the annual tables of deaths from 1933 to 1954; and the ten-year tables of marriages and deaths from 1955 to 1974 (January 12, 2016). Birth records from 1903; marriage records from 1903 to 1940. Death records from 1903 to 1986; ten-year tables of deaths from 1975 to 1984. Marriage records from 1941 to 1945; annual tables of deaths for 1985 and 1986. Reconstructed civil status records prior to 1860: Birth records (November 2020). Marriage records (January 2021). Death records (November 2021). Currently, all old Parisian civil records are accessible online.
Enzymes can use cofactors as 'helper molecules'. Coenzymes are referred to those non-protein molecules that bind with enzymes to help them fulfill their jobs. Mostly they are connected to the active site by non-covalent bonds such as hydrogen bond or hydrophobic interaction. But sometimes a covalent bond can also form between them. For example, the heme in cytochrome C is bound to the protein through thioester bond. In some occasions, coenzymes can leave enzymes after the reaction is finished. Otherwise, they permanently bind to the enzyme. Coenzyme is a broad concept which includes metal ions, various vitamins and ATP. If an enzyme needs coenzyme to work itself, it is called an apoenzyme. In fact, it alone cannot catalyze reactions properly. Only when its cofactor comes in and binds to the active site to form holoenzyme does it work properly. One example of the coenzyme is Flavin. It contains a distinct conjugated isoalloxazine ring system. Flavin has multiple redox states and can be used in processes that involve the transfer of one or two electrons. It can act as an electron acceptor in reaction, like the oxidation of NAD to NADH, to accept two electrons and form 1,5-dihydroflavin. On the other hand, it can form semiquinone(free radical) by accepting one electron, and then converts to fully reduced form by the addition of an extra electron. This property allows it to be used in one electron oxidation process.
Sources: en.wikipedia.org
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.
Creatinine is a degradation product formed when creatine loses water and cyclizes. It can appear during storage, processing, or analysis if conditions are harsh. Quality specifications often set a maximum limit for creatinine to control purity.
No universal testing protocol applies across all markets. Some products follow pharmacopeial monographs, while others rely on manufacturer specifications and third-party certificates. Common tests include assay, water content, heavy metals, and microbial limits.
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.