Everything below concerns glutathione. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-04-29. Where a claim depends on a specific study, the study is described rather than over-claimed.
Biosynthesis proceeds in two ATP-dependent steps. First, glutamate-cysteine ligase joins glutamate and cysteine. Second, glutathione synthetase adds glycine to the intermediate. The pathway is regulated by cysteine availability, enzyme expression, and feedback inhibition by glutathione itself. Liver tissue has a particularly high capacity for synthesis and export. Because the molecule is made inside cells, circulating glutathione reflects a balance of release, uptake, and breakdown rather than simple dietary supply.
Functionally, glutathione supports redox balance by donating electrons and becoming oxidized. It also serves as a cofactor for enzymes such as glutathione peroxidases and glutathione S-transferases. These enzymes participate in peroxide reduction and in conjugation reactions that help process reactive molecules. Separate from antioxidant roles, glutathione can modify protein cysteines through S-glutathionylation, influencing enzyme activity and signaling. Research continues to examine how these chemical roles translate into whole-organism effects.
Glutathione is a small sulfur-containing peptide built from glutamic acid, cysteine, and glycine. Its distinctive feature is a gamma-glutamyl bond between glutamate's side-chain carboxyl group and cysteine's amino group. This linkage resists ordinary peptidases and helps the molecule remain stable inside cells. The reduced thiol form, often abbreviated GSH, is the dominant intracellular species. The oxidized disulfide dimer, GSSG, forms when two reduced molecules link through their cysteine sulfur atoms. The balance between these forms is a common redox indicator.
In living systems, glutathione occurs in millimolar concentrations in many cell types, while extracellular levels are generally much lower. The liver holds a substantial share of the body's total pool, and the molecule participates in reduction, detoxification, and amino acid transport. It also serves as a cofactor for enzymes such as glutathione peroxidase and glutathione S-transferase. Because the cysteine residue supplies a reactive thiol, glutathione can donate electrons and become oxidized. Cells regenerate reduced glutathione through glutathione reductase using NADPH.
| Property | Value | Notes |
|---|---|---|
| Common name | Glutathione (reduced form) | Often abbreviated GSH |
| Chemical class | Tripeptide | Contains glutamate, cysteine, and glycine |
| Molecular formula | C10H17N3O6S | Refers to the reduced form |
| Molar mass | 307.32 g/mol | Calculated for C10H17N3O6S |
| Appearance | White to off-white powder | Typical laboratory-grade solid |
Glutathione is a small tripeptide built from glutamate, cysteine, and glycine. The peptide bond between glutamate and cysteine uses the gamma-carboxyl group, a linkage that resists ordinary peptidases. Cells make it in two ATP-dependent steps: gamma-glutamylcysteine synthetase joins glutamate and cysteine, then glutathione synthetase adds glycine. The pathway is feedback-inhibited by glutathione itself, so intracellular levels tend to stay within a narrow range. Because cysteine is often limiting, sulfur amino acid supply influences how much glutathione a cell can produce.
In its reduced form, glutathione carries a sulfhydryl group that can donate electrons. This property lets it act as a major cellular antioxidant and redox buffer. Glutathione peroxidase uses it to reduce hydrogen peroxide and lipid peroxides, while glutathione reductase regenerates the reduced form using NADPH. The ratio of reduced glutathione to glutathione disulfide is widely used as an indicator of oxidative stress, though the ratio changes with compartment, cell type, and sample handling. Oxidized glutathione can also form mixed disulfides with proteins, affecting their activity.
Glutathione supports detoxification by conjugating reactive electrophiles through glutathione S-transferases. The resulting conjugates are processed and exported, often after further metabolism. It also stores cysteine, transports amino acids across membranes through the gamma-glutamyl cycle, and assists in the maturation of iron-sulfur clusters and some prostaglandins. In plants, animals, and many microbes, the molecule appears in similar roles, but concentrations vary enormously between tissues. Liver, kidney, and red blood cells tend to contain high amounts, while blood plasma contains much less.
Measuring glutathione in biological samples requires attention to oxidation and matrix effects. High-performance liquid chromatography with ultraviolet or fluorescence detection can separate reduced and oxidized forms after derivatization. Liquid chromatography with tandem mass spectrometry offers higher specificity and can quantify glutathione alongside related thiols. Because glutathione can oxidize during sample handling, many protocols use rapid acidification with metaphosphoric acid or sulfosalicylic acid. Internal standards help correct for losses during extraction and analysis.
Enzymatic recycling assays provide a complementary approach for total glutathione. In these methods, glutathione reductase reduces oxidized glutathione while a thiol-reactive reagent, such as 5,5'-dithiobis(2-nitrobenzoic acid), produces a colored product. The reaction cycles between reduced and oxidized forms, amplifying the signal. Spectrophotometric or fluorometric detection can then estimate concentration. Distinguishing reduced glutathione from glutathione disulfide often requires separate aliquots, masking agents, or chromatographic separation, and the choice affects reported values.
"Quantitave Model of Solvent Effects on Hydroxypyridine-Pyridone and Mercaptopyridine-Thiopyridone Equilibria: Correlation with Reaction-Field and Hydrogen-Bond Effects". J. Org. Chem. 45 (8): 1347–1353. doi:10.1021/jo01296a001. Beak P, Covington JB, Smith SG, White JM, Zeigler JM (1980). "Displacement of Protomeric Equilibria by Self-Association: Hydroxypyridine-Pyridone and Mercaptopyridine-Thiopyridone Isomer Pairs". J. Org. Chem. 45 (8): 1354–1362. doi:10.1021/jo01296a002.
As a potential weapon material, pure uranium-233 is more similar to plutonium-239 than uranium-235 in terms of source (bred vs natural), half-life and critical mass (both 4–5 kg in beryllium-reflected sphere). Unlike reactor-bred plutonium, it has a very low spontaneous fission rate, which combined with its low critical mass made it initially attractive for compact gun-type weapons, such as small-diameter artillery shells. A declassified 1966 memo from the US nuclear program stated that uranium-233 has been shown to be highly satisfactory as a weapons material, though it was only superior to plutonium in rare circumstances. It was claimed that if the existing weapons were based on uranium-233 instead of plutonium-239, Livermore would not be interested in switching to plutonium. The co-presence of uranium-232 can complicate the manufacture and use of uranium-233, though the Livermore memo indicates a likelihood that this complication can be worked around. Chuck Hansen wrote in Swords of Armageddon that 233U was evaluated by the United States for its ability to substitute for supergrade plutonium in nuclear weapons. As it was deemed equivalent to plutonium rather than superior to it, military interest in 233U-based weapons waned in the late 1960s. However, several 233U-based nuclear weapons were tested by the US between 1955 and 1968. The Rocky Flats Plant, which refined fissile materials for weapons production, was refining 233U until the early 1980s.
As the new Emperor could not exert his constitutional powers until he came of age, a regency was set up by the General Assembly. In the absence of a charismatic figure who could represent a moderate face of power, a series of localized rebellions took place, such as the Cabanagem in Grão-Pará, the Malê Revolt in Salvador, the Balaiada (Maranhão), the Sabinada (Bahia), and the Ragamuffin War, which began in Rio Grande do Sul and was supported by Giuseppe Garibaldi. These emerged from the provinces' dissatisfaction with the central power, coupled with old and latent social tensions peculiar to a vast, slaveholding and newly independent nation state. This period of internal political and social upheaval, which included the Praieira revolt in Pernambuco, was overcome only at the end of the 1840s, years after the end of the regency, which occurred with the premature coronation of Pedro II in 1841. During the last phase of the monarchy, internal political debate centered on the issue of slavery. The Atlantic slave trade was outlawed in 1850, as a result of the British Aberdeen Act and the Eusébio de Queirós Law, but only in May 1888, after a long process of internal mobilization and debate for an ethical and legal dismantling of slavery in the country, was the institution formally abolished with the approval of the Golden Law. The foreign-affairs policies of the monarchy dealt with issues pertaining Brazil's neighboring countries in the Southern Cone.
Sources: en.wikipedia.org
The term injection encompasses intravenous (IV), intramuscular (IM), subcutaneous (SC or SQ) and intradermal (ID) administration. Parenteral administration generally acts more rapidly than topical or enteral administration, with onset of action often occurring in 15–30 seconds for IV, 10–20 minutes for IM and 15–30 minutes for SC. They also have essentially 100% bioavailability and can be used for drugs that are poorly absorbed or ineffective when they are given orally. Some medications, such as certain antipsychotics, can be administered as long-acting intramuscular injections. Ongoing IV infusions can be used to deliver continuous medication or fluids. Disadvantages of injections include potential pain or discomfort for the patient and the requirement of trained staff using aseptic techniques for administration. However, in some cases, patients are taught to self-inject, such as SC injection of insulin in patients with insulin-dependent diabetes mellitus. As the drug is delivered to the site of action extremely rapidly with IV injection, there is a risk of overdose if the dose has been calculated incorrectly, and there is an increased risk of side effects if the drug is administered too rapidly.
Structural similarities between acetyl-CoA and malonyl-CoA suggest that certain lysine acetyltransferases (KATs) may also catalyze malonylation. KAT2A (GCN5) has been experimentally linked to histone malonylation and is currently the strongest candidate, while p300 has also been proposed and is known to mediate other acyl modifications such as crotonylation. Analogous to the GCN5 acetylation mechanism, the ε-amino group is thought to be transiently deprotonated by a catalytic base within the enzyme's active site, thereby enabling the same reaction with malonyl-CoA as in non-enzymatic malonylation. However, specific enzymes known as malonyltransferases have not yet been definitively identified. The demalonylation is catalyzed by the enzyme Sirtuin 5 (SIRT5), a class III histone deacetylase that requires NAD+ for activity but is inhibited by nicotinamide. SIRT5 is globally expressed in mitochondrial, cytoplasmic, and nuclear compartments, and can also remove other negatively charged acyl modifications. It catalyzes the demalonylation in the following reaction:
Body composition may be analyzed in various ways. This can be done in terms of the chemical elements present, or by molecular structure e.g., water, protein, fats (or lipids), hydroxyapatite (in bones), carbohydrates (such as glycogen and glucose) and DNA. In terms of tissue type, the body may be analyzed into water, fat, connective tissue, muscle, bone, etc. In terms of cell type, the body contains hundreds of different types of cells, but notably, the largest number of cells contained in a human body (though not the largest mass of cell) are not human cells, but bacteria residing in the normal human gastrointestinal tract.
Sources: en.wikipedia.org
== External links == Media related to Binge eating disorder at Wikimedia Commons Pull, Charles B (January 2004). "Binge eating disorder". Current Opinion in Psychiatry. 17 (1): 43–48. doi:10.1097/00001504-200401000-00008. Binge Eating Disorder on National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
=== Dual-mode === In dual-mode, the mobile and stationary phases are reversed part way through the separation experiment. This requires changing the phase being pumped through the column as well as the direction of flow. Dual-mode operation is likely to elute the entire sample from the column but the order of elution is disrupted by switching the phase and direction of flow.
He was also believed to take refuge in Morocco and Dubai. On 26 July 2015, Houssine Ait Soussan was arrested by the Moroccan police in the port of Tangier with false documents. A few days after his arrest, two searches took place in the apartments where he stayed at in Marrakech. At least 10 false Dutch, French and Moroccan identity documents were found, alongside 34 luxury watches, 10 phones, two tablets, 178,570 dirhams and €700. Houssine Ait Soussan was eventually released after 3 months by the Moroccan authorities. The Dutch and Belgian authorities believe that Houssine Ait Soussan is currently running his operations while hiding out in Morocco.
Sources: en.wikipedia.org
Glutathione is a sulfur-containing tripeptide made from glutamate, cysteine, and glycine. It is found in most cells and participates in redox balance and detoxification reactions.
No. It is a tripeptide assembled from three amino acids. The term amino acid applies to the individual building blocks, not to the assembled molecule.
It is present in many tissues, with especially high amounts in liver. Intracellular concentrations are generally much higher than those found in blood plasma.
It is a tripeptide rather than a full protein. Proteins generally contain many amino acids joined by alpha-peptide bonds, while glutathione has three residues and an unusual gamma-glutamyl linkage. That structure affects how enzymes recognize and break it down.