A practical reference on pharmacopeial monograph: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-09-06. 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.
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.
Regulatory treatment of creatine monohydrate varies by country and intended use. In some jurisdictions it is sold as a dietary supplement, while in others it may be treated as a food ingredient or a pharmaceutical raw material. Pharmacopeial monographs, where available, define identification, assay limits, and impurity thresholds. Manufacturers often follow these monographs or internal specifications to ensure batch-to-batch consistency. Analytical method validation is important because different methods can yield different apparent purity values if sample preparation or detection conditions are not controlled.
Quality control for creatine monohydrate begins with identity confirmation and assay determination. Laboratories commonly use high-performance liquid chromatography with ultraviolet detection, often after derivatization or using a suitable column, to quantify creatine. Karl Fischer titration measures water content, which helps verify the monohydrate stoichiometry. Additional tests screen for heavy metals, residual solvents, and microbial contamination depending on the intended use. These tests establish composition and purity rather than biological effect.
| 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 |
Stability studies typically examine the effects of temperature, humidity, and light on creatine monohydrate. Sealed containers stored in cool, dry conditions help limit moisture uptake and hydrolysis. Elevated temperature and high relative humidity can accelerate conversion to creatinine, especially in aqueous solutions. In solid dosage forms, excipients and processing steps may also affect stability. Published stability data are not fully consistent across studies because test conditions and analytical methods vary.
Quality control of creatine monohydrate relies on a combination of identity, purity, and moisture tests. High-performance liquid chromatography with ultraviolet detection is widely used to separate creatine from creatinine and other related nitrogenous compounds. Spectroscopic methods such as infrared and nuclear magnetic resonance provide structural confirmation. Because the material is a hydrate, water content is measured separately, often by Karl Fischer titration. These tests together establish whether a lot meets a defined specification.
In animals, creatine is synthesized mainly in liver, kidney, and pancreas from arginine, glycine, and methionine. The first committed step transfers a guanidino group from arginine to glycine, forming guanidinoacetate. Subsequent methylation by S-adenosylmethionine yields creatine. Dietary sources include meat and fish; endogenous synthesis supplies part of the body pool. Most creatine is stored in skeletal muscle, where it is converted to phosphocreatine and participates in rapid regeneration of adenosine triphosphate during short, intense activity.
Commercial creatine products appear in several forms, including monohydrate, hydrochloride, citrate, nitrate, and ethyl ester. Creatine monohydrate is the most studied form and serves as a reference material in comparative research. Different forms vary in solubility, pH, and water content, but they share creatine as the active moiety after dissolution. Claims that one form is uniformly superior remain debated, and study designs often differ in population, exercise protocol, and outcome measures. Purity and hydration state are central to interpreting product labels.
Creatine monohydrate is the hydrated form of creatine, a nitrogen-containing organic acid involved in cellular energy transfer. Its molecular formula is C4H11N3O3, and it consists of creatine plus one water molecule in the crystal lattice. The anhydrous base, creatine, has the formula C4H9N3O2. The compound appears as a white, odorless, crystalline powder and is classified as a guanidine derivative. It is distinct from creatinine, a breakdown product measured in clinical chemistry.
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.
In dry solid form, creatine monohydrate is relatively stable when protected from moisture and heat. The crystal lattice includes water, and exposure to high humidity can cause caking or gradual changes in powder flow. Elevated temperatures may accelerate decomposition, particularly if moisture is present. Studies generally report that sealed, dry material retains acceptable purity for extended periods, although exact shelf life depends on packaging and storage conditions. Light exposure is not usually considered a major factor for this compound.
Creatine monohydrate is one of several solid forms of creatine described in the literature. Other forms include anhydrous creatine, creatine hydrochloride, and creatine ethyl ester, each with different solubility and stability characteristics. The monohydrate is distinct from creatinine, a spontaneous breakdown compound that forms when creatine loses water and cyclizes. Commercial descriptions sometimes use synonyms such as methylguanidoacetic acid or N-(aminoiminomethyl)-N-methylglycine, which refer to the same base molecule. These names appear in chemical databases and product labels.
Creatine monohydrate is a crystalline compound formed when one molecule of creatine binds with one molecule of water. Creatine itself is a nitrogen-containing organic acid involved in cellular energy transfer, particularly in muscle and nerve tissue. The monohydrate form is the most common solid form used in research and commercial products because it is relatively stable and easy to handle. Its molecular formula is C4H9N3O2·H2O, and its molar mass is about 149.15 grams per mole.
Some females stay and defend the nest until the chicks start hatching, but most leave the nesting area completely to nest again; in a good season, a female emu may nest three times. If the parents stay together during the incubation period, they will take turns standing guard over the eggs while the other drinks and feeds within earshot. If it perceives a threat during this period, it will lie down on top of the nest and try to blend in with the similar-looking surrounds, and suddenly stand up to confront and scare the other party if it comes close. Incubation takes 56 days, and the male stops incubating the eggs shortly before they hatch. The temperature of the nest rises slightly during the eight-week period. Although the eggs are laid sequentially, they tend to hatch within two days of one another, as the eggs that were laid later experienced higher temperatures and developed more rapidly. During the process, the precocial emu chicks need to develop a capacity for thermoregulation. During incubation, the embryos are kept at a constant temperature but the chicks will need to be able to cope with varying external temperatures by the time they hatch. Newly hatched chicks are active and can leave the nest within a few days of hatching. They stand about 12 cm (5 in) tall at first, weigh 0.5 kg (17.6 oz), and have distinctive brown and cream stripes for camouflage, which fade after three months or so. The male guards the growing chicks for up to seven months, teaching them how to find food.
=== Urban legend === An urban legend suggests that tetryzoline can cause violent diarrhea if given orally, such as by putting a few drops of Visine in an unsuspecting person's beverage. However, the actual results of the prank may be worse, varying from severe nausea and vomiting to seizures or a coma. Larger doses can cause death. Diarrhea is not a side effect.
==== Entrapment ==== This is an irreversible physical immobilization technique which can be considered as a physical restriction of enzyme in a specified area/space. It can be used for raising mechanical stability and can be also used for the reduction of leaching events of enzymes. Since the enzyme in this process does not interact chemically with the polymer/ material of the support fibers/lattice, it remains protected from denaturation with time. Basically, the enzyme is trapped in insoluble beads or microspheres, such as calcium alginate beads. However, these insoluble substances hinder the arrival of the substrate, and the exit of products.
Adrenocortical carcinoma (ACC) is an aggressive cancer originating in the cortex (steroid hormone-producing tissue) of the adrenal gland. Adrenocortical carcinoma is remarkable for the many hormonal syndromes that can occur in patients with steroid hormone-producing ("functional") tumors, including Cushing's syndrome, Conn syndrome, virilization, and feminization. Adrenocortical carcinoma has often invaded nearby tissues or metastasized to distant organs at the time of diagnosis, and the overall 5-year survival rate is about 50%. Adrenocortical carcinoma is a rare tumor, with incidence of one to two per million population annually. It has a bimodal distribution by age, with cases clustering in children under 5 and in adults 30–40 years old. The widely used angiotensin-II-responsive steroid-producing cell line H295R was originally isolated from a tumor diagnosed as adrenocortical carcinoma. Adrenocortical carcinoma can occur at any age, with the highest incidence between 40 and 60 years of age. Women are more frequently affected (55 to 60%) than men (40 to 45%). Adrenocortical carcinomas usually occur sporadically in adults. However, they sometimes occur as part of hereditary syndromes, such as:
In 1813, Lieutenant-Colonel, Sir Thomas Sydney Beckwith arrived in Bermuda to command a force tasked with raiding the Atlantic Seaboard of the United States, specifically in the region of Chesapeake Bay, with the 102d Regiment's Commanding Officer, Lieutenant-Colonel Charles James Napier, as his Second-in-Command. Beckwith split the force into two brigades. One, was the 102d Regiment, Royal Marines from the Bermudian naval base, and two companies recruited from French prisoners-of-war that had been sent to reinforce the Bermuda garrison, was under Napier's command, and the other under Lieutenant-Colonel Williams of the Royal Marines. Embarking aboard naval vessels engaged on the American coast on the 8 June 1813, they took part in the Battle of Craney Island on 22 June 1813. On 8 August 1813, 15 British ships blockaded the mouth of the Patapsco River as part of a ruse to make the Americans believe Baltimore was under threat. After a few days the ships headed south towards Annapolis. However, Rear Admiral George Cockburn believed Annapolis too heavily defended, and instead had the 102d Regiment and Royal Marines construct a base on Kent Island. The 102d Regiment fought a small skirmish against local militia on the island, before assisting with construction of the base. After carrying out raids on the Atlantic coast of the United States, and minus the two companies of Frenchmen, they left the Chesapeake and landed at Halifax, Nova Scotia, on 20 September 1813.
Sources: en.wikipedia.org
Selenocysteine (symbol Sec or U, in older publications also as Se-Cys) is the 21st proteinogenic amino acid. Selenoproteins contain selenocysteine residues. Selenocysteine is an analogue of the more common cysteine with selenium in place of the sulfur. Selenocysteine is present in several enzymes (for example glutathione peroxidases, tetraiodothyronine 5′ deiodinases, thioredoxin reductases, formate dehydrogenases, glycine reductases, selenophosphate synthetase 2, methionine-R-sulfoxide reductase B1 (SEPX1), and some hydrogenases). It occurs in all three domains of life, including important enzymes (listed above) present in humans. Selenocysteine was discovered in 1974 by biochemist Thressa Stadtman at the National Institutes of Health.
=== MNPs drug delivery === As mentioned earlier, MNPs deliver more efficient delivery compared to topical or oral intake. In drug delivery study, researchers want to gain faster peak concentrations (Cmax) in MNPs compared to other methods. Study shows that MNPs reach peak concentration as fast as 20 minutes (tmax), while oral intake reaches peak concentration in one hour. Furthermore, the Cmax from MNPs is higher up to six times, compared to oral intake. Making the delivery fast and the body gets the most concentration of intended drugs. This value is only matched with direct injection, but with skin trauma and people with needle phobia, MNPs might be an alternative to reach roughly the same time and concentration. In order to get more direct local delivery, MNPs can be used in different tissues other than the skin. In Table 1, there are at least five internal surfaces that MNPs have been studied for its delivery and four other external surfaces other than the skin.
==== Pharmaceuticals ==== The pharmaceutical industry constitutes the most important customer base for the fine chemical industry. The largest companies are Pfizer, USA; Roche, Switzerland, GlaxoSmithKline, UK; Sanofi Aventis, France, and Novartis, Switzerland. All are active in R&D, manufacturing and marketing. Pharmaceuticals containing more than 2000 different active ingredients are in commerce today; a sizable number of them are sourced from the fine chemical industry. The industry also has a track record of above-average growth. The fine chemical industry has a keen interest in the top-selling or "blockbuster drugs", those with worldwide annual sales in excess of $1 billion. Their number has increased steadily, from 27 in 1999 to 51 in 2001, 76 in 2003, and then levelled off.
The bilaterogastraea hypothesis was developed by Gösta Jägersten as an adaptation of Ernst Haeckel's Gastraea hypothesis. He proposed that the Bilaterogastraea have a two-stage life cycle, with a pelagic juvenile and a benthic adult stage. The invagination of the original gastrula stage he saw as bilaterally symmetric rather than radially symmetric. The choanoflagellate hypothesis was proposed by Élie Metchnikoff in the 1880s. In this model, single cell flagellates combine into a colony like sponges. Evolutionary advantages of the colony form lead to more complex shapes. The concept has been elaborated in the 20th century as the Choanoblastaea model.
The most versatile synthesis developed by the Swiss team first involved alkylation of 2,4-dinitrochlorobenzene with 1-amino-2-diethylaminoethane to form N-(β-diethylaminoethyl)-2,4-dinitroaniline (also known as N′-(2,4-dinitrophenyl)-N,N-diethyl-ethane-1,2-diamine). The 2-nitro substituent on the 2,4-dinitroaniline compound is then selectively reduced to the corresponding primary amine by utilizing ammonium sulfide as the reducing agent. The ammonium sulfide can be formed in situ by the addition of concentrated aqueous ammonium hydroxide followed by saturation of the solution with hydrogen sulfide gas. The intermediate formed by the selective reduction of the 2-nitro substituent, 2-(β-diethylaminoethylamino)-5-nitroaniline, is then reacted with the hydrochloride salt of the imino ethyl ether of 4-ethoxyphenylacetonitrile (a.k.a. p-ethoxybenzyl cyanide). The imino ether, 2-(4-ethoxyphenyl)-acetimidic acid ethyl ester hydrochloride, is prepared by dissolving the 4-substituted benzyl cyanide in a mixture of anhydrous ethanol and chloroform and then saturating this solution with dry hydrogen chloride gas. The reaction between the 2-(β-dialkylaminoalkylamine)-5-nitroaniline and the HCl salt of the imino ethyl ether results in the formation of etonitazene. This procedure is particularly useful in the preparation of the 4-, 5-, 6-, and 7-nitrobenzimidazoles. Varying the choice of the substituted phenylacetic acid imino ether affords compounds with a diversity of substituents on the benzene ring at the 2- position.
Sources: en.wikipedia.org
== Contraindications == Loratadine is usually compatible with breastfeeding (classified category L-2 - probably compatible, by the American Academy of Pediatrics). In the U.S., it is classified as category B in pregnancy, meaning animal reproduction studies have failed to demonstrate a risk to the fetus, but no adequate and well-controlled studies in pregnant women have been conducted.
The United in Science 2022 report is published by the WMO, summarizing latest climate science-related updates and assessing recent climate change mitigation progress as "going in the wrong direction". 14 September A new deep learning technique enables year-round measurements of sea ice thickness in the Arctic. A research report by NewsGuard indicates there is a high level of online misinformation delivered – to a mainly young user base – with TikTok, whose usage is increasing. The WHO joins health associations and scientists in calling for a global fossil fuel non-proliferation treaty to protect lives of current and future generations.
== History == Israeli pediatric endocrinologist Zvi Laron, along with Athalia Pertzelan, Avinoam Galatzer, Liora Kornreich, Dalia Peled, Rivka Kauli, and Beatrice Klinger published the earliest clinical studies of individuals with LS beginning in 1966. Among their first 22 patients, Laron and colleagues noted consanguineous genealogy of Israeli and Palestinian ancestry with distinct physical characteristics resembling hypopituitarism. However, researchers noticed that these people had high serum GH levels, which are expected to be low in patients with hypopituitarism. Successive studies carried out over the subsequent 20 years by Laron and colleagues revealed an absence of IGF-1 release in response to exogenous hGH and an absence of GH binding to liver cell membranes in this group of patients. The results of these studies provided clear evidence that the pathogenicity of the disease was the result of GH receptor failure in the liver.
=== Fourth week (14–18 March) === On 14 March, the Taliban-run Afghan Ministry of Defense said that Taliban forces had captured a Pakistani border outpost, killing 14 soldiers and injuring 11 others. The ministry also added that they destroyed an armored tank and a military vehicle of Pakistani forces. However, Pakistani officials denied allegations made by Afghan Ministry of Defense, terming them false, fabricated and aimed at misleading the Afghan public. According to Pakistani officials, the damages and losses suffered by the Afghan Taliban and the Pakistani Taliban were being regularly documented, with related video and photographic evidence shared with the media. Elsewhere, Pakistani security forces killed six Pakistani Taliban militants in Lakki Marwat. Later that day, Pakistani officials stated that the Pakistan Air Force had carried out airstrikes on five military bases in Kandahar, including the General Directorate of Intelligence (GDI), Haibatullah Akhundzada's special forces unit, the border command, a tunnel, and a Taliban technical equipment warehouse. Pakistani officials added that the targeted military sites had been destroyed and released videos and images of the strikes in Kandahar. Locals in Kandahar told an Agence France-Presse journalist that military aircraft had flown over a mountain housing a military facility before an explosion was heard. Afghan locals sources state that Pakistani airstrikes struck a Taliban special forces facility linked to Hibatullah Akhundzada, as well as an ammunition depot and a border command center in Kandahar Province.
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.
Karl Fischer titration is a standard method for measuring water content in solid and liquid samples. The result helps confirm the expected monohydrate stoichiometry. Loss-on-drying can also indicate moisture but may not distinguish water from other volatile substances.