If you have been reading about HPLC-UV 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.
Updated 2026-03-09. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
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 |
|---|---|---|
| Common analytical method | HPLC-UV | Separation from creatinine and related compounds. |
| Moisture content | Typically 12% theoretical | Monohydrate stoichiometry corresponds to about 12% water by mass. |
| Typical storage temperature | 15–25 °C | Cool, dry, sealed conditions limit moisture uptake. |
| Degradation marker | Creatinine | Formed by cyclization, especially in solution or with heat. |
| Solubility class | Moderately soluble in water | Solubility rises with temperature and varies with pH. |
Creatine monohydrate is a crystalline compound formed from creatine and one molecule of water. Creatine itself is a nitrogen-containing organic acid that occurs in vertebrate muscle and other tissues. The monohydrate designation refers to the water included in the crystal lattice, not to water added during manufacturing. Its chemical formula is commonly written as C4H9N3O2·H2O. The solid is typically a white, odorless powder with low solubility in water at room temperature. It is one of several creatine forms described in scientific and commercial literature.
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.
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.
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.
Creatine monohydrate is a crystalline compound formed from creatine and one water molecule in its solid lattice. Creatine itself is a nitrogen-containing organic acid involved in energy transfer in muscle and other tissues. The monohydrate form is the most common solid form used in research and commercial products because it is stable and easy to handle. The term "monohydrate" refers to the fixed one-to-one ratio of water to creatine in the crystal, not to moisture content. This distinction matters when comparing labels or calculating creatine content.
In chemical terms, creatine monohydrate is often described as N-(aminoiminomethyl)-N-methylglycine monohydrate, though nomenclature varies. Its solid state consists of zwitterionic creatine molecules linked with water through hydrogen bonding. The compound dissolves in water, but dissolution rate depends on particle size, temperature, and agitation. Once dissolved, the hydrate water becomes part of the solvent, leaving free creatine in solution. The monohydrate is not the same as creatine anhydrous, which lacks the water of crystallization and has a higher creatine fraction by mass.
Quality control for creatine monohydrate typically combines identity, assay, and impurity tests. High-performance liquid chromatography with ultraviolet detection is common for separating creatine from creatinine and related substances. Nuclear magnetic resonance and infrared spectroscopy can confirm molecular structure, while titration may assess acid-base content. Moisture content, heavy metals, residual solvents, and microbial limits are checked according to applicable standards. These tests help distinguish compliant material from powders that have degraded, been diluted, or contain manufacturing residues.
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.
Finals appearances were rare for the side, which was often in contention for the wooden spoon. Essendon did manage to make the 1968 VFL Grand Final, but it lost to Carlton by just three points and did not make it back to the big stage for 15 years. During the period from 1968 until 1980, five different coaches were tried, with none lasting longer than four years. Off the field, the club went through troubled times as well. In 1970, five players went on strike before the season even began, demanding higher payments. Essendon did make the finals in 1972 and 1973 under the autocratic direction of Des Tuddenham (Collingwood), but they were beaten badly in successive elimination finals by St. Kilda and did not taste finals action again until the very end of the decade. The 1970s Essendon sides were involved in many rough and tough encounters under Tuddenham, who himself came to loggerheads with Ron Barassi at a quarter-time huddle where both coaches exchanged heated words. Essendon had tough but talented players with the likes of Ron "Rotten Ronnie" Andrews and experienced players such as Barry Davis, Ken Fletcher, Geoff Blethyn, Neville Fields and Western Australian import Graham Moss. In May 1974, a controversial half-time all-in-brawl with Richmond at Windy Hill and a 1975 encounter with Carlton were testimony to the era. Following the Carlton match, the Herald described Windy Hill as "Boot Hill" because of the extent of the fights and the high number of reported players (eight in all — four from Carlton and four from Essendon).
The war on drugs caused soaring arrest rates in the US that disproportionately targeted African Americans due to various factors. Anti-drug and tough-on-crime policies from the 1970s through the 1990s created a situation where the US, with less than 5% of the world population, houses nearly 25% of the world's prisoners. Increased demand lead to the development of privatization and the for-profit prison industry. As of 2015, the US prison population rate was 716 per 100,000 people, the highest in the world, six times higher than Canada and six to nine times higher than Western European countries.
A 2023 meta-analysis including 13 cardiovascular outcome trials reported that SGLT2 inhibitors reduce the risk for three-point major adverse cardiovascular events, especially in subjects with an estimated glomerular filtration rate (eGFR) below 60 mL/min, whereas GLP-1 receptor agonists were more beneficial in people with higher eGFRs. Likewise, the relative risk reduction of SGLT-2 inhibitor treatment was larger in populations with a higher proportion of albuminuria, but this relationship was not observed for GLP-1 receptor agonists. This suggests differential use of the two substance classes in people with preserved and reduced renal function or with and without diabetic nephropathy, respectively. GLP-1 agonists and SGLT2 inhibitors work to reduce HbA1c by different mechanisms and can be combined for enhanced effects. They may provide additive cardioprotective effects. The US Food and Drug Administration has not approved GLP-1 agonists for type 1 diabetes, but they have been used off-label in addition to insulin.
== Epidemiology == An estimated 20 per million live births are diagnosed with EB, and 9 per million people in the general population have the condition. Of these cases, approximately 92% are EBS, 5% are DEB, 1% are JEB, and 2% are unclassified. Carrier frequency ranges from 1 in 333 for JEB, to 1 in 450 for DEB; the carrier frequency for EBS is presumed to be much higher than JEB or DEB. The disorder occurs in every racial and ethnic group and affects both sexes.
Sources: en.wikipedia.org
== Composition == The substance is primarily composed of polysaccharides, including galactose, rhamnose, and α-glucuronic acid. It also contains dietary fiber, carbohydrates, proteins, and small amounts of vitamins. Despite marketing claims, peach gum does not contain collagen, which is exclusive to animal tissues.
=== Stem cells and cellular plasticity === Multipotent adult stem cells have the capacity to be self-renewing and give rise to different cell types. Stem cells give rise to progenitor cells, which are cells that are not self-renewing, but can generate several types of cells. The extent of stem cell involvement in cutaneous (skin) wound healing is complex and not fully understood. Stem cell injection leads to wound healing primarily through stimulation of angiogenesis. It is thought that the epidermis and dermis are reconstituted by mitotically active stem cells that reside at the apex of rete ridges (basal stem cells or BSC), the bulge of hair follicles (hair follicular stem cell or HFSC), and the papillary dermis (dermal stem cells). Moreover, bone marrow may also contain stem cells that play a major role in cutaneous wound healing. In rare circumstances, such as extensive cutaneous injury, self-renewal subpopulations in the bone marrow are induced to participate in the healing process, whereby they give rise to collagen-secreting cells that seem to play a role during wound repair. These two self-renewal subpopulations are (1) bone marrow-derived mesenchymal stem cells (MSC) and (2) hematopoietic stem cells (HSC). Bone marrow also harbors a progenitor subpopulation (endothelial progenitor cells or EPC) that, in the same type of setting, are mobilized to aid in the reconstruction of blood vessels.
Collagen casings are mainly produced from the collagen in beef or pig hides, and the bones and tendons. It can also be derived from poultry and fish. They have been made for more than 50 years and their share of the market has been increasing. Usually the cost to produce sausages in collagen is significantly lower than making sausages in gut because of higher production speeds and lower labor requirements. The collagen for artificial casings is processed extensively. It is formed by extrusion through a die to the desired diameter, dried and shirred into short sticks up to 41 cm (16 in) long that contain as much as 50 m (160 ft) of casing. In a newer process, a form of dough is coextruded with the meat blend, and a coating is formed by treating the outside with a calcium solution to set the coating. The latest generation of collagen casings are usually more tender than natural casings and do not exhibit the "snap" or "bite" of natural casing sausages. Most collagen casings are edible, but a special form of thicker collagen casings is used for salamis and large caliber sausages where the casing is usually peeled off the sausage by the consumer. Collagen casings are less expensive to use, give better weight and size control, and are easier to run when compared to natural casings.
Sources: en.wikipedia.org
=== Cuban oil reserves === On 25 April 2026, Miguel Díaz-Canel celebrated this week as a historic milestone the fact that Cuban national crude can be refined, when in reality the Cabaiguán refinery has been processing that same oil since 2010, as acknowledged by the deputy director of CUPET during the April session of the National Council of Innovation (CNI). The announcement from the Cuban government revolves around a thermal conversion technology developed by the Oil Research Center (Ceinpet), affiliated with the Union Cuba Petróleo (CUPET), to process the heavy crude from the northern oil belt, characterized by its high density, viscosity, and sulfur content.
=== Complications === Complications may include urinary retention, recurring urinary tract infections and incontinence. The anterior vaginal wall may protrude though the vaginal introitus (opening). This can interfere with sexual activity. Recurrent urinary tract infections are common for those who have urinary retention. In addition, though cystocele can be treated, some treatments may not alleviate troubling symptoms, and further treatment may need to be performed. Cystoceles may affect the quality of life; women who have cystoceles tend to avoid leaving their homes and avoid social situations. The resulting incontinence puts women at risk of being placed in a nursing home or long-term care facility.
Guanidines are a group of organic compounds sharing a common functional group with the general structure (R1R2N)(R3R4N)C=N−R5. The central bond within this group is that of an imine, and the group is related structurally to amidines and ureas. Examples of guanidines are arginine, triazabicyclodecene, saxitoxin, and creatine. One technique for persubstituted guanidine synthesis converts a urea to the diaminodichloride with phosgene and then uses the product to alkylate another amine. Galegine is an isoamylene guanidine.
Sources: en.wikipedia.org
Laboratories typically combine chromatographic separation with moisture and elemental analysis. High-performance liquid chromatography can quantify creatine and related substances such as creatinine. Moisture methods confirm the hydrate form and help detect excess water.
The dry crystalline solid is relatively stable when protected from moisture and heat. In solution, it can convert to creatinine over time, especially at higher temperatures. Storage conditions and product form influence the rate of change.
Moisture uptake can cause particles to stick together, particularly in humid conditions or after opening a container. Clumping does not necessarily mean the creatine has degraded. It can make accurate measuring more difficult, so dry storage and sealed packaging are used.
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.