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 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Creatine monohydrate is stable under dry, cool conditions but can degrade when exposed to moisture and heat. In solution, it undergoes hydrolysis to creatinine, a cyclic derivative with little role in phosphagen energy transfer. The rate of conversion increases with temperature, storage time, and acidic or alkaline pH. Solid material kept in a sealed container at room temperature generally retains its composition for extended periods. Moisture uptake is a primary concern because it can accelerate breakdown and caking.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Typical storage temperature | 15-25 °C | Sealed container; protect from moisture and direct heat. |
| Theoretical water content | About 12.1% | One water molecule per creatine molecule. |
| Primary degradation product | Creatinine | Formed by cyclization, especially in aqueous solution. |
| Common analytical method | HPLC-UV | Used to separate creatine from creatinine and related impurities. |
| Regulatory classification (U.S.) | Dietary supplement ingredient | Other jurisdictions may classify it as a food supplement or novel food depending on rules. |
== Fort Montgomery chain (1776–1777) == In 1776 a chain and boom were stretched across the river from Fort Montgomery on the west bank, at the lower entrance to the Highlands just north of the modern-day Bear Mountain Bridge, to Anthony's Nose on the east bank. Captain Thomas Machin headed the chain effort. In November 1776, a faulty link broke under stress induced by the river current, highlighting some of the difficulties of trying to chain the Hudson. It was repaired and reset. After the British captured forts Montgomery and Clinton, a second fortress built opposite it at the mouth of Popolopen's Kill (today's Popolopen Creek) on its south bank, on October 6, 1777, they dismantled the chain. Free to do so, they raided upriver as far as Kingston, then the capitol of New York State, putting the torch to it and burning all but several of its hundreds of buildings to the ground. Governor George Clinton, a member of the committee assigned by the New York Convention to devise a means of defending the Hudson, was heartened as the British had never attempted to run ships through the chain. He concluded that the basic idea of obstructing the river seemed sound. After Captain Machin recovered from wounds from battle with the British, he began work on the stronger Great Chain at West Point, which was constructed and installed in 1778.
Cancer begins as cells that grow uncontrollably, usually as a result of an internal change or oncogenic mutations within the cell. Cancer develops and progresses as the microenvironment undergoes dynamic changes. The stromal reaction in cancer is similar to the stromal reaction induced by injury or wound repair: increased extracellular matrix (ECM) and growth factor production and secretion, which consequently cause growth of the tissue. In other words, the body reacts similarly to a cancer as it does to a wound, causing scar-like tissue to be built around the cancer. As such, the surrounding stroma plays a very important role in the progression of cancer. The interaction between cancer cells and surrounding tumor stroma is thus bidirectional, and the mutual cellular support allows for the progression of the malignancy.
=== Liver and kidney failure === The drug should be used with caution in those with liver or kidney failure, due to metabolism in the liver (to the active molecule desmetramadol) and elimination by the kidneys.
== Senegal and Mauritania == El Hadj Umar Tall (1797–1864) – religious leader from the Tijani Sufi Order from Senegal. Founder of the Toucouleur Empire Ahmadou Tall (1836–1897) – Second Sultan of the Toucouleur Empire Sulayman Bal (1726–1776) – Islamic scholar and war commander from the Futa Toro in Senegal Macky Sall – former president of Senegal; Chairman of the African Union Abdoulaye Baldé (politician)- Politician, former secretary-general of the presidency, Mayor of Ziguinchor, Senegal Abdoulaye Saydou Sow - Former Minister of Urban Planning, Housing and Public Hygiene Abdou Rachid Thiam - Biophysicist, research director at French National Centre for Scientific Research. Abdourahmane Sow- Politician, former Minister and former vice-president of the National Assembly Senegal. Abou Lô - Former Minister of Communication, Telecommunications and ICT, Senegal. Abdoulaye Bibi Baldé - Former Minister of Communication, Telecommunications, Posts and Digital Ecosystem Ahmadou Bamba Ba – Religious leader, Senegal Amadou Kane - Former Minister of Economy and Finance, Senegal. Amadou-Mahtar M'Bow - Former director general of UNESCO, First African to Lead a Global Institution. Mame Madior Boye - First Female prime minister of Senegal. Aïssata Kane – former Mauritanian politician who was the country's first female government minister and women's rights activist. Amadou Ba- Politician. Current prime minister, former minister of foreign affairs, former Minister of Economy and Finance, Senegal Amadou Hott - Senegalese economist.
== Definition == Next-generation sequencing uses the techniques of metagenomics to identify and characterize the genome of bacteria, fungi, parasites, and viruses without the need for a prior knowledge of a specific pathogen directly from clinical specimens. The capacity to detect all the potential pathogens in a sample makes metagenomic next generation sequencing a potent tool in the diagnosis of infectious disease especially when other more directed assays, such as PCR, fail.
Sources: en.wikipedia.org
The reaction with a second amino acid allows for the ring to open, later forming an acylated unsaturated dipeptide. The reaction happens in a step-wise function which allows for the amino group to be protected and the azlactone to be produced. Catalytic hydrogenation and hydrolysis then take place in order to produce the dipeptide (4).
==== Growing regions ==== In Vanuatu, exportation of kava is strictly regulated. Only cultivars classified as noble are allowed to be exported. Only the most desirable cultivars for everyday drinking are classified as noble to maintain quality control. In addition, their laws mandate that exported kava must be at least five years old and farmed organically. Their most common noble cultivars are "Borogu" or "Borongoru" from Pentecost Island, "Melomelo" from Aoba Island (called Sese in the north Pentecost Island), and "Palarasul" kava from Espiritu Santo. In Vanuatu, Tudei ("two-day") kava is reserved for special ceremonial occasions and exporting it is not allowed. "Palisi" is a common Tudei variety. In Hawaii, there are many other cultivars of kava (Hawaiian: ʻawa). Some of the most common cultivars are Mahakea, Moʻi, Hiwa, and Nene. The Aliʻi (kings) of precolonial Hawaii coveted the Moʻi variety, which had a strong cerebral effect due to a predominant amount of the kavalactone kavain. This sacred variety was so important to them that no one but royalty could ever experience it, "lest they suffer an untimely death". The reverence for Hiwa in old Hawaiʻi is evident in this portion of a chant recorded by Nathaniel Bright Emerson and quoted by E. S. Craighill and Elizabeth Green Handy: "This refers to the cup of sacramental ʻawa brewed from the strong, black ʻawa root (ʻawa hiwa), which was drunk sacramentally by the kumu hula":
== January 14, 1982 (Thursday) == An Ethiopian Air Force Antonov An-26 crashed near Addis Ababa, Ethiopia while transporting a group of Ethiopian, Libyan and Cuban soldiers to a fight in Eritrea. All 73 occupants on board were killed. It the state of Hidalgo in Mexico, near the town of Atotonilco de Tula, the bodies of 13 men were found by a drainage canal. The dead men would be found to have been from Colombia, who had been arrested, as well as a Mexican taxicab driver who had helped transport them to the scene of the deaths. Mexico City Police Chief Arturo Durazo Moreno, accused by a subordinate of having planned the killings, would end up fleeing Mexico after the inauguration of a new president. Robert Dale Henderson began a spree of mostly random murders that would kill 12 people across five U.S. states, in a little more than three weeks until his arrest on February 6, starting with a beautician in Cincinnati. One week later, on January 21, he murdered a family of three in Cherry Fork, Ohio, followed by the January 24 killing of a receptionist in Charleston, South Carolina, the January 25 homicides of a doctor and a clerk in Palatka, Florida and a mother and daughter later in the day in Valdosta, Georgia. He killed a nightclub owner in Port Allen, Louisiana on January 29, and three hitchhikers in Hernando County, Florida on February 4, before approaching a deputy sheriff at a shopping center in Punta Gorda, Florida, making a confession, and surrendering.
Chronic hepatitis B causes liver inflammation and injury that, over several decades, can lead to cirrhosis. Hepatitis D is dependent on the presence of hepatitis B and accelerates cirrhosis in co-infection.
Sources: en.wikipedia.org
The linker histone, or H1 protein, is also involved maintaining nucleosome structure. The H1 protein has the special role of ensuring that DNA stays tightly wound. Modifications to histone proteins and their DNA are classified as quaternary structure. Condensed chromatin, heterochromatin, prevents transcription of genes. In other words, transcription factors cannot access wound DNA- This is in contrast to euchromatin, which is decondensed, and therefore, readily accessible to the transcriptional machinery. DNA methylation to nucleotides influences chromatin quaternary structure. Highly methylated DNA nucleotides are more likely found within heterochromatin whereas unmethylated DNA nucleotides are common in euchromatin. Furthermore, post-translational modifications can be made to the core histone tail domains, which lead to changes in DNA quaternary structure and therefore gene expression. Enzymes, known as epigenetic writers and epigenetic erasers, catalyze either the addition or removal of several modifications to the histone tail domains. For instance, an enzyme writer can methylate Lysine-9 of the H3 core protein, which is found in the H3 histone tail domain. This can lead to gene repression as the chromatin gets remodeled and resembles heterochromatin. However, dozens of modifications can be made to histone tail domains. Therefore, it is the sum of all those modifications that determine whether chromatin will resemble heterochromatin or euchromatin.
=== Diabetes and insulin resistance === Disruptions in slow wave (delta) sleep have been shown to increase risk for development of Type II diabetes, potentially due to disruptions in the growth hormone secreted by the pituitary. In addition, hypoglycemia occurring during sleep may also disrupt delta-wave activity. Low-voltage irregular delta waves, have also been found in the left temporal lobe of diabetic patients, at a rate of 56% (compared to 14% in healthy controls).
== Transmission == The feline panleukopenia virus is considered ubiquitous, meaning it is in virtually every place that is not regularly disinfected. The infection is highly contagious among unvaccinated cats. Antibodies against FPLV, produced by the adaptive immune system, play an important role in the feline response to the virus. Maternally-derived antibodies (MDA) efficiently protect kittens from fatal infection. This passively acquired immunity is later replaced by an active immune response obtained by vaccination or as a consequence of a natural infection. In kittens, the period of greatest susceptibility to infection is when maternal antibodies are absent, or waning, and vaccine-induced immunity has not yet fully developed. Free-roaming cats are thought to be exposed to the virus during their first year of life. Those that develop a subclinical infection or survive acute illness mount a robust, long-lasting, protective immune response. An infected cat sheds large amounts of virus in all body secretions including feces, vomit, urine, saliva, and mucus during the acute phase of illness. It can continue to shed the virus for as long as six weeks after recovery. Subclinically ill cats can also shed the virus in body secretions. The virus can be carried or transferred on an infected object (such as bedding, food dishes, fur) or by other animals, fleas, and humans (see: fomites). It persists long after evidence of the original body secretion has faded away, and can be transported long distances.
This expansion is a compensatory response to the damage caused to red blood cells by the imbalanced production of globin chains. Bone marrow expansion can lead to abnormal bone structure, particularly in the skull and face. Expansion of the bone marrow in the developing child leads to a distinctive facial shape often referred to as "Chipmunk facies". Other skeletal changes include osteoporosis, growth retardation, and malformation of the spine. People with thalassemia can get too much iron in their bodies, either from the disease itself as red blood cells are destroyed, or as a consequence of frequent blood transfusions. Excess iron is not excreted, but forms toxic non-transferrin-bound iron. This can lead to organ damage, potentially affecting the heart, liver, endocrine system, bones and spleen. Symptoms include an irregular heartbeat, cardiomyopathy, cirrhosis of the liver, hypothyroidism, delayed puberty and fertility problems, brittle and deformed bones, and an enlarged spleen. The spleen is the organ which removes damaged red blood cells from circulation; in thalassemia patients it is abnormally active, causing it to enlarge and possibly become hyperactive, a condition called hypersplenism. The immune system can become compromised in a number of ways; anemia, iron overload, and hypersplenism may affect the immune response and increase the risk of severe infection.
== International and political work == In October 1945, Orr was elected Rector of the University of Glasgow after standing as an Independent Progressive candidate. He was elected as an independent Member of Parliament (MP) for the Combined Scottish Universities in a by-election in April 1945, and kept his seat at the general election shortly after. He resigned in 1946. After the Second World War, Boyd Orr resigned from the Rowett Institute, and took several posts, most notably as Director-General of the United Nations' new Food and Agriculture Organization (FAO). Although his tenure in this position was short (1945–1948), he worked not only to alleviate the immediate postwar food shortage through the International Emergency Food Committee (IEFC) but also to propose comprehensive plans for improving food production and its equitable distribution. His proposal to create a World Food Board to increase price stability by way of large scale commodity storage. Although the board failed to get the support of Britain and the US, Boyd Orr laid a firm foundation for the new UN-specialized agency. He then resigned from the FAO and became director of a number of companies and proved a canny investor in the stock market, making a considerable personal fortune. When he received the Nobel Peace Prize in 1949, he donated the entire financial award to organizations devoted to world peace and a united world government. He was elevated to the peerage in the 1949 New Year Honours as Baron Boyd-Orr, of Brechin Mearn in the County of Angus.
Sources: en.wikipedia.org
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.
Heat, moisture, and prolonged time in solution promote conversion to creatinine. The reaction is faster at higher temperatures and at pH values far from neutral. Dry powder is much more stable than dissolved material.
Common methods include high-performance liquid chromatography for creatine and creatinine, plus water-content analysis by Karl Fischer titration. Heavy metals, residual solvents, and microbial limits may also be tested. A specification may list total creatine content and impurity limits.
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.