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.
Last reviewed on 2026-03-20. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
In aqueous solution, creatine monohydrate undergoes a slow conversion to creatinine, a cyclized degradation product. This reaction is pH- and temperature-dependent, and it proceeds faster in warm or alkaline conditions. Because the conversion is gradual, analytical measurements of creatine in solution must account for time and storage history. The equilibrium favors creatinine more strongly at higher temperatures, which is relevant to sample handling in laboratories and to beverage formulations. Refrigeration slows but does not entirely stop this process.
Quality assessment of creatine monohydrate typically uses high-performance liquid chromatography to separate creatine from creatinine and other impurities. Other methods include nuclear magnetic resonance spectroscopy, titration, and infrared spectroscopy for identity confirmation. Purity is often reported as a percentage of the labeled compound on a dry basis, while moisture content is measured separately. Because different analytical methods have different selectivity, comparing purity values across sources requires attention to the method and sample preparation.
| Property | Value | Notes |
|---|---|---|
| Typical storage temperature | 15–25 °C | Cool, dry, away from moisture |
| Relative humidity | < 50% | High humidity promotes degradation |
| Primary degradation product | Creatinine | Formed via cyclization, especially in solution |
| Common analytical method | HPLC-UV | Often at 210 nm; also titration or NMR |
| Shelf life (solid) | 2–3 years | When kept sealed and dry; varies by manufacturer |
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.
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.
Typically, synthetic oligonucleotides are single-stranded DNA or RNA molecules around 15–25 bases in length. Oligonucleotides find a variety of applications in molecular biology and medicine. They are most commonly used as antisense oligonucleotides, small interfering RNA, primers for DNA sequencing and amplification, probes for detecting complementary DNA or RNA via molecular hybridization, tools for the targeted introduction of mutations and restriction sites, and for the synthesis of artificial genes. An emerging application of Oligonucleotide synthesis is the re-creation of viruses from sequence alone — either harmless, such as Phi X 174, or dangerous such as the 1917 influenza virus or SARS-CoV-2.
=== Glioma and chemotherapy resistance === ITGA1 has been implicated in resistance to glioma treatment as well. The particular treatment it is resistant to is temozolomide (TMZ), which is the standard first-line chemotherapy agent used with radiotherapy and adjuvant treatment. There is an observed elevation of ITGA1 expression in TMZ-resistant glioma tissues when compared with a control group of TMZ-sensitive cell lines. Tumor cell survival is promoted by ITGA1 activating the PI3K/AKT pathway, subsequently increasing the anti-apoptotic Bcl-2 signaling and reducing apoptosis. A regulatory pathway involving hsa_circ_0110757 and hsa-miR-1298-5p controls ITGA1 expression in TMZ-resistant glioma. hsc_circ_0110757 functions as a competing endogenous RNA by sponging miR-1298-5p, which promotes ITGA1 expression and leads to increased PI3K/AKT activation as well as reduced apoptosis, and enhanced TMZ resistance. Disrupting this pathway restores the cell sensitivity to chemotherapy. This supports ITGA1 as a possible therapeutic target to overcome drug resistance in glioma.
===== Type 2M ===== VWD Type 2M results from a loss-of-function mutation in von Willebrand factor (VWF). This mutation leads to reduced binding of VWF with GP1b (similar to VWD Type 2A) or with collagen. Like other Type 2 VWD subtypes, there is a decreased ratio of VWF Activity to antigen. Differentiating VWD Type 2M from Type 2A involves analyzing VWF multimers through electrophoresis. In VWD Type 2M, all multimers are identified but uniformly decreased in quantity, resembling the pattern seen in VWD Type 1. Conversely, in VWD Type 2A, high molecular weight multimers are either absent or present in very low quantities. VWD Type 2M can be further differentiated from VWD Type 1 based on the VWF Activity to antigen ratio. In Type 1, the ratio is >0.7. In Type 2M, the ratio is <0.7. In Type 2M, factor VIII activity can be normal or low while the ristocetin-induced platelet aggregation (RIPA) is typically low. It is uncommon and manifests with moderate to severe bleeding. The disease may follow either an autosomal dominant or recessive pattern of inheritance.
The tanning process begins with obtaining an animal skin. When an animal skin is to be tanned, the animal is killed and skinned before the body heat leaves the tissues. This can be done by the tanner, or by obtaining a skin at a slaughterhouse, farm, or local fur trader. Before tanning, the skins are often dehaired, then have fat, meat and connective tissue removed. They are then washed and soaked in water with various compounds, and prepared to receive a tanning agent. They are then soaked, stretched, dried, and sometimes smoked.
Sources: en.wikipedia.org
Disagreements arose, because the brigand wanted to assault Platì and take revenge on the local liberals, unlike Borjes, who eventually gave in. The unsuccessful assault took place on September 17. The brigands and legitimists were repelled by the National Guards and a regular army unit. This failure soon ended their collaboration. On October 20 Borjes traveled to Basilicata to join his forces with those of Carmine Crocco. They achieved successes, but not the final objective, as the brigand leader refused to turn his men into a regular army. Noting the failure of the plan, the Catalan general attempted to travel to Rome to report to the Bourbon ruler. He was captured in Tagliacozzo and shot on 8 December 1861. Borjes' failure did not end brigandage, which continued with greater virulence. For this reason, the first Minghetti government promulgated the Pica law on 15 August 1863. It was a regulation that suspended constitutional guarantees for the southern provinces and imposed a state of siege. It delivered brigands to military tribunals, without appeal or defense. In Calabria the law was applied in Citeriore and Calabria Ulteriore Seconda, while the Reggio area, as was the area around Naples and part of Apulia were exempted. The Pica law remained in force until 31 December 1865, and contributed to eradicating banditry, albeit with repressive methods and without resolving the southern territories' social and economic problems. An underlying issue was latifundium (estates), which were in the hands of a few economic and political elites.
Executive: The executive consists of the Cabinet, led by the prime minister, and the Attorney-General's chambers, led by the attorney-general. The Cabinet is collectively responsible for all government policies and the day-to-day administration of the affairs of state. It is typically composed of members of the Singapore Parliament. The prime minister is appointed by the president, and the ministers in the Cabinet and the attorney-general are appointed by the president, acting on the advice and consent of the prime minister. The prime minister is the effective head of the executive branch of government. Legislature: The Singapore Parliament is unicameral and, together with the president, comprises the legislature. Members of parliament (MP) consist of elected, non-constituency, and nominated members. The majority of MPs are elected into parliament at a general election. The Singapore Parliament is collectively responsible for enacting the laws governing the state. The president holds limited discretionary powers of oversight over the government. The president's veto powers are further subject to parliamentary overruling. Judiciary: The judiciary's function is to independently administer justice and is headed by the chief justice of the Republic of Singapore. The judges and judicial commissioners are appointed by the president on the advice of the prime minister. The Supreme Court and State Courts adjudicates in civil disputes between persons, convicts or acquits accused persons in criminal prosecutions, and interprets laws to decide on its constitutionality.
== Terminology == Eras cannot easily be defined for periodization, the process of categorizing the past into quantified, named blocks of time for the purpose of analysis. 1500 is an approximate starting period for the modern era because many major events caused the Western world to change around then: from the fall of Constantinople (1453), Gutenberg's moveable type printing press (1450s), and Christopher Columbus's voyage to the Americas (1492), to the Reformation begun with Martin Luther's Ninety-five Theses (1517). The term "modern" was coined shortly before 1585 to describe the beginning of a new era. It was long thought that the term "early modern" was invented either in the 1930s, to distinguish the time between the Middle Ages and late Enlightenment (1800), or the mid-20th century, and only gained traction in the 1960s. Justus Nipperdey pointed to its widespread usage by American historians around 1900 already, adding: 'In the interwar years the term permeated all areas of professional activity from textbooks and graduate school seminars to conferences, research articles, and job descriptions.' The difference between "early modern" and "modern" was defined by the French Revolution and Industrial Revolution. The European Renaissance (14th–16th centuries), which started in Italy, is an important transition period beginning in the Late Middle Ages and marking the change into early modern history.
Sources: en.wikipedia.org
In their second publication on nuclear fission, Hahn and Strassmann used the term Uranspaltung (uranium fission) for the first time, and predicted the existence and liberation of additional neutrons during the fission process, opening up the possibility of a nuclear chain reaction. This was shown to be the case by Frédéric Joliot and his team in March 1939. Edwin McMillan and Philip Abelson used the cyclotron at the Berkeley Radiation Laboratory to bombard uranium with neutrons, and were able to identify an isotope with a 23-minute half-life that was the daughter of uranium-239, and therefore the real element 93, which they named neptunium. "There goes a Nobel Prize", Hahn remarked. At the KWIC, Kurt Starke independently produced element 93, using only the weak neutron sources available there. Hahn and Strassmann then began researching its chemical properties. They knew that it should decay into the real element 94, which according to the latest version of the liquid drop model of the nucleus propounded by Bohr and John Archibald Wheeler, would be even more fissile than uranium-235, but were unable to detect its radioactive decay. They concluded that it must have an extremely long half-life, perhaps millions of years. Part of the problem was that they still believed that element 94 was a platinoid, which confounded their attempts at chemical separation.
Tocochromanols protect the seed lipids from oxidizing and becoming rancid. The presence of tocochromanols extends seed longevity and promotes successful germination and seedling growth. Gamma-tocopherol dominates in seeds of most plant species, but there are exceptions. For canola, corn and soy bean oils, there is more γ-tocopherol than α-tocopherol, but for safflower, sunflower and olive oils the reverse is true. Of the commonly used food oils, palm oil is unique in that tocotrienol content is higher than tocopherol content. Seed tocochromanols content is also dependent on environmental stressors. In almonds, for example, drought or elevated temperature increase α-tocopherol and γ-tocopherol content of the nuts. Drought increases the tocopherol content of olives, and heat likewise for soybeans. Vitamin E biosynthesis occurs in the plastid and goes through two different pathways: the Shikimate pathway and the Methylerythritol Phosphate pathway (MEP pathway). The Shikimate pathway generates the chromanol ring from the Homogentisic Acid (HGA), and the MEP pathway produces the hydrophobic tail which differs between tocopherol and tocotrienol. The synthesis of the specific tail is dependent on which molecule it originates from. In a tocopherol, its prenyl tail emerges from the geranylgeranyl diphosphate (GGDP) group, while the phytyl tail of a tocotrienol stems from a phytyl diphosphate.
==== Associate of the Royal Red Cross (ARRC) ==== Flight Lieutenant Phillipa Jayne Ward (0409397), Princess Mary's Royal Air Force Nursing Service. Squadron Leader Hazel Weir (0409276), Princess Mary's Royal Air Force Nursing Service.
This suggests that the increase in IGF-1 may not be specific to cow's milk, and may be caused by protein, minerals, or some other factors in milk unrelated to rBGH. There have been no direct comparisons of IGF-1 levels in people who drink ordinary cow's milk vs. milk stimulated by rBST. At this time, it is not clear that drinking milk, produced with or without rBST treatment, increases blood IGF-1 levels into a range that might be of concern regarding cancer risk or other health effects. IGF-1 concentrations are slightly higher (to variable degrees, depending on the study) in milk from cows treated with rBST than in untreated milk. This variability is presumed to be much less than the normal range of variation of IGF-1 in cow's milk due to natural factors, but more research is needed." As of 2014, evidence does not link rBST-treated milk with adverse health outcomes for children. Several studies have looked at the relationship between type 1 diabetes mellitus and infant feeding. Environmental triggers that may elicit an autoimmune reaction is the mechanism in which is being studied. Some studies have shown early exposure to bovine milk may predispose an infant to type 1 diabetes, whereas other studies show no causality. The American Society of Animal Science published an article in 2014 after reviewing health issues arising from the rBST debate. The article indicated "there are no new human health issues related to the use of rBST by the dairy industry. Use of rBST has no effect on the micro- and macrocomposition of milk.
Sources: en.wikipedia.org
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.
Common methods include high-performance liquid chromatography, titration, and nuclear magnetic resonance spectroscopy. These techniques quantify the parent compound and detect related substances such as creatinine.
Keep the powder in a tightly sealed container in a cool, dry place, ideally between 15 and 25 degrees Celsius with low humidity. Avoid storing aqueous solutions for extended periods because degradation occurs faster in solution.
Dry, sealed creatine monohydrate can remain stable for years, but storage conditions affect its shelf life. Moisture, heat, and repeated opening of containers can reduce quality over time.