This is a working overview of creatine kinase, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-05-07 and is reviewed periodically as new material appears.
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.
In the human body, creatine is synthesized mainly in the liver and kidneys from the amino acids glycine, arginine, and methionine. Dietary sources include meat, fish, and other animal tissues, which supply preformed creatine. Because plant foods contain little or no creatine, dietary intake varies widely among populations. The compound is stored largely in skeletal muscle, where it is converted to phosphocreatine and used to regenerate adenosine triphosphate during short bursts of activity.
Creatine monohydrate is a crystalline compound formed from creatine and one molecule of water. Its systematic name is N-(aminoiminomethyl)-N-methylglycine monohydrate, and it appears as a white, odorless powder with limited solubility in water. The monohydrate is the most common solid form used in research and commercial products because it is stable under dry conditions. The anhydrous form lacks the water of crystallization and differs slightly in molar mass. Both forms participate in the same biochemical reactions once dissolved.
In the body, creatine is synthesized from the amino acids arginine, glycine, and methionine, primarily in the liver and kidneys. It is transported to muscle and other tissues, where it is phosphorylated to phosphocreatine by creatine kinase. This phosphagen system provides a rapid source of adenosine triphosphate during short, intense contractions. Dietary creatine comes mainly from meat and fish, and the body's total pool is influenced by both synthesis and intake.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C4H9N3O2·H2O | Monohydrate; anhydrous base is C4H9N3O2 |
| Molar mass | 149.15 g/mol | Calculated for the monohydrate form |
| Appearance | White crystalline powder | Typical laboratory and food-grade material |
| Solubility in water | Sparingly soluble at room temperature | Solubility increases with temperature |
| Common synonyms | Methylguanidoacetic acid; N-(aminoiminomethyl)-N-methylglycine | Synonyms refer to the creatine base, not the hydrate specifically |
Creatine monohydrate is a crystalline organic compound formed from creatine and water in a one-to-one ratio. It belongs to the guanidino family and contains a methylated guanidine group attached to an acetate-like chain. The solid is commonly described as a white, odorless powder with a mildly bitter taste. Its molecular formula is C4H11N3O3·H2O, and the hydrated form is the most widely traded grade. The compound occurs naturally in vertebrate muscle and brain tissue, where it participates in rapid energy buffering.
In aqueous solution, creatine monohydrate exists mainly as a zwitterion, carrying both a positive guanidinium charge and a negative carboxylate charge. This charge separation raises water solubility relative to many neutral organic solids and helps explain its behavior in analytical separations. The monohydrate can lose its water of crystallization under sustained heat or low humidity, converting toward anhydrous creatine. Such transitions matter for mass balance calculations because the hydrate contributes water mass that is not part of the active creatine molecule.
=== P53 and p73 === p53 and p73 are tumor suppressor proteins and their degradation is tightly regulated by ubiquitination. Recently it was shown that their degradation can also occur via an ubiquitin-independent process; NQO1 blocks p53 and p73 degradation in the presence of NADH and protects them from 20S proteasomal degradation. This protein-protein interaction between p53 and NQO1 was non-catalytic.
== Regulation == Regulation of NET function is complex and a focus of current research. NETs are regulated at both the cellular and molecular level post-translation. The most understood mechanisms include phosphorylation by the second messenger protein kinase C (PKC). PKC has been shown to inhibit NET function by sequestration of the transporter from the plasma membrane. The amino acid sequence of NET has shown multiple sites related to protein kinase phosphorylation. Post-translational modifications can have a wide range of effects on the function of the NET, including the rate of fusion of NET-containing vesicles with the plasma membrane, and transporter turnover.
The synthesis of fentanyl and its analogues are illustrated in these skeletal diagrams. The synthesis of fentalogs is done by reacting the ring structure as a base, 4-ANPP also called 4-anilino-N-phenethylpiperidine and despropionylfentanyl. 4-ANPP acts as a base because of its two amine nitrogens, the secondary amine acts as a base to react with an organic acid which condenses into an amide. Depending on the organic acid used in the amide condensation, different analogues of fentanyl will be produced. To help align this phenomenon in the eyes of chemists, we have numerated the precursor 4-ANPP with a [0.], and then the reactions synthesizing fentanyl, acetylfentanyl, butyrylfentanyl, and benzoylfentanyl with a [1.], [2.], [3.], and [4.] respectively. To further aid in the chemical pedagogy we have aligned each number with a reaction number -> precursor -> product system that follows the following scheme: EXAMPLE: reaction number -> precursor -> product [compound name] 1 -> α -> a [fentanyl] 2 -> β -> b [acetylfentanyl] 3 -> γ -> c [butyrylfentanyl] 4 -> δ -> d [benzoylfentanyl] Using the above scheme, a chemist can quickly extrapolate the reactions necessary for other fentanyl analogues with more complex organic acids, such as cyclopropryl fentanyl or cyclopentyl fentanyl, or any other fentanyl analogue derived from a reaction of 4-ANPP with a novel organic acid.
Sources: en.wikipedia.org
=== Medicinal benefit === The use of spider silk in the medical field has gained much recognition over the last twenty years. Silk has been praised for its wound healing purposes because it contains compounds such as vitamin K. Spider silk is primarily composed of proteins made up of non-polar amino acids such as glycine and alanine. However, it also contains the organic compound pyrrolidine which functions to hold the silk's moisture and potassium nitrate which prevents any fungal or bacterial growth from occurring on the silk.
In July 2016, a leak of the Democratic National Committee's emails appeared to show DNC officials favoring Clinton over Sanders. Staff repeatedly discussed making his irreligious tendencies a potential campaign issue in southern states and questioned his party loyalty. DNC chair Debbie Wasserman Schultz called his campaign manager "an ass" and "a damn liar". Speaking with Jake Tapper on CNN, Sanders responded to the leak, saying, "it is an outrage and sad that you would have people in important positions in the DNC trying to undermine my campaign. It goes without saying: the function of the DNC is to represent all of the candidates—to be fair and even-minded. But again, we discussed this many, many months ago, on this show, so what is revealed now is not a shock to me."
The open circuit demand system exhausts gas to the environment at ambient pressure (or a very small difference from ambient pressure required to open the exhaust valve). As a result, all exhaled gas is lost to the surroundings. For most surface orientated commercial diving where air is the breathing gas in use, this is no problem, as air is cheap and freely available. Even with nitrox it is generally more cost effective to use open circuit, as oxygen is an easily available and relatively inexpensive gas, and blending nitrox is technologically simple, both to mix and to analyse.
Sources: en.wikipedia.org
Creatine monohydrate is the hydrated solid form of creatine, a nitrogen-containing compound involved in cellular energy metabolism. It consists of one creatine molecule associated with one water molecule in a crystal lattice.
No. Creatinine is a breakdown product formed when creatine loses water and cyclizes, and it is not the same compound. The two names are similar but refer to different chemical structures and roles.
The body synthesizes creatine from amino acids, mainly in the liver and kidneys. It also comes from animal foods such as meat and fish, while plant foods contain little or none.
It is a compound made of creatine bound to one water molecule. It appears as a white crystalline powder and is the most common solid form of creatine used in research and supplements.