This is a working overview of glutathione, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-04-18 and is reviewed periodically as new material appears.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. Its glutamate-cysteine linkage uses the gamma-carboxyl group of glutamate, a feature that resists standard peptidases. The cysteine residue provides a thiol group, which gives the molecule its reducing character. In cells, glutathione is often the most abundant small-molecule thiol, with concentrations varying widely by tissue and compartment. It exists mainly in a reduced form called GSH, while oxidation produces a disulfide-linked dimer called GSSG.
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.
Glutathione is synthesized in two ATP-dependent steps. First, gamma-glutamylcysteine synthetase links glutamate and cysteine; second, glutathione synthetase adds glycine to form the complete tripeptide. The pathway is feedback-inhibited by GSH itself, which helps maintain steady intracellular levels. Tissues vary widely in glutathione content, with the liver typically containing the highest concentrations, followed by the kidneys, lungs, and erythrocytes. Because cysteine is often limiting, its availability influences synthesis rates, and regulation of this pathway varies by cell type.
Glutathione serves as a cofactor for several enzymes, including glutathione peroxidase and glutathione S-transferase. These enzymes help reduce hydrogen peroxide and lipid peroxides, and they conjugate reactive electrophiles for excretion. The molecule also acts as a reservoir for cysteine, an amino acid that is prone to oxidation. In addition, glutathione participates in the metabolism of nitric oxide, leukotrienes, and prostaglandins. Its roles extend to cell signaling, apoptosis, and the regulation of protein function through S-glutathionylation.
| 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 participates in detoxification reactions, amino acid transport, and the maintenance of protein thiols. It serves as a cofactor for several enzymes, including glutathione peroxidases and glutathione S-transferases. In research literature, altered glutathione status appears in studies of aging, infection, metabolic stress, and environmental exposure. Whether low glutathione is a cause, consequence, or marker of such conditions often remains unresolved. Direct measurement in blood or tissue provides a snapshot, but results depend on sample handling, timing, and the method used.
Glutathione is a small tripeptide made of glutamic acid, cysteine, and glycine. Its cysteine thiol group allows reversible oxidation and reduction, making it central to cellular redox chemistry. The reduced form, often abbreviated GSH, predominates inside most cells, while the oxidized disulfide form, GSSG, forms when two GSH molecules react. The ratio of GSH to GSSG is widely used as an indicator of oxidative stress in laboratory research, though it does not by itself diagnose a clinical condition.
Biosynthesis occurs in two ATP-dependent steps. The enzyme glutamate-cysteine ligase joins glutamate and cysteine, forming gamma-glutamylcysteine; glutathione synthetase then adds glycine to produce the complete tripeptide. Because the peptide bond from glutamate uses the gamma-carboxyl group, glutathione resists digestion by many ordinary peptidases. Tissues vary in synthesis capacity, and the liver generally contains high concentrations relative to many other organs. This uneven distribution contributes to organ-specific differences in redox buffering and affects how experimental results are interpreted across tissue types.
Common analytical approaches include enzymatic recycling assays, high-performance liquid chromatography, and mass spectrometry. Enzymatic recycling measures total glutathione after converting GSSG back to GSH, while separation methods can quantify GSH and GSSG separately. Derivatization may be used to improve detection or stability during analysis. LC-MS/MS offers high specificity and can distinguish glutathione from related thiols and adducts. Each method has different sensitivity, throughput, and susceptibility to interference, so method selection depends on the study question and sample matrix.
For solid glutathione reagents, storage at low temperature and protection from moisture and light are typical precautions. Aqueous solutions can oxidize over time, and pH affects stability; alkaline conditions generally promote thiol oxidation. Some protocols prepare fresh solutions, while others use antioxidants or chelators to limit metal-catalyzed oxidation. Purity and counterion content can vary among commercial preparations, affecting concentration calculations. Certificates of analysis and validated assays help verify identity and purity.
α-Methylphenylalanine (α-MePhe or AMPA) is an artificial amino acid and a phenethylamine and amphetamine derivative. It is the α-methylated analogue of phenylalanine, the precursor of the catecholamine neurotransmitters, and the amino acid analogue of amphetamine (α-methylphenethylamine), a psychostimulant and monoamine releasing agent. α-MePhe is a tyrosine hydroxylase inhibitor, thereby preventing the transformation of tyrosine into L-DOPA, and results in depletion of the catecholamine neurotransmitters. It is also an inhibitor of phenylalanine hydroxylase, and in conjunction with phenylalanine administration, induces hyperphenylalaninemia analogous to that in phenylketonuria in animals. The drug is known to produce metaraminol (3,β-dihydroxyamphetamine), a catecholamine releasing agent, as an active metabolite in animals, and this metabolite contributes to its effects. α-MePhe is a substrate of the L-type amino acid transporter 1 (LAT1), which transports it across the blood–brain barrier into the central nervous system.
{\displaystyle {\ce {AB + C <=> AC + B}};\quad K_{\rm {B,C}}={\frac {{\ce {[AC][B]}}}{{\ce {[AB][C]}}}}={\frac {K_{\rm {AC}}{\ce {[A][B][C]}}}{K_{\rm {AB}}{\ce {[A][B][C]}}}}={\frac {K_{\rm {AC}}}{K_{\rm {AB}}}}}
Otherwise: Cut the potato into slices as shown above, stew with Spanish wine, oil and nutmeg. (French: Tartoufle autrement. Conppez la tartoufle par tranches comme deſſus, & la mettez eſteuuer avec vin d'Eſpagne & nouveau beure, & noix muſcade.)
Differential stresses arising from inhomogeneous densification have also been shown to result in the propagation of internal cracks, thus becoming the strength-controlling flaws. Inert gas evaporation and inert gas deposition are free many of these defects due to the distillation (cf. purification) nature of the process and having enough time to form single crystal particles, however even their non-aggreated deposits have lognormal size distribution, which is typical with nanoparticles. The reason why modern gas evaporation techniques can produce a relatively narrow size distribution is that aggregation can be avoided. However, even in this case, random residence times in the growth zone, due to the combination of drift and diffusion, result in a size distribution appearing lognormal. It would, therefore, appear desirable to process a material in such a way that it is physically uniform with regard to the distribution of components and porosity, rather than using particle size distributions that will maximize the green density. The containment of a uniformly dispersed assembly of strongly interacting particles in suspension requires total control over interparticle forces. Monodisperse nanoparticles and colloids provide this potential.
Sources: en.wikipedia.org
== Endolithic fungi found in the eggs of Cretaceous dinosaurs == Evidence of endolithic fungi were discovered within dinosaur eggshell found in central China. They were characterized as being “needle-like, ribbon-like, and silk-like.". Fungus is seldom fossilized and even when it is preserved it can be difficult to distinguish endolithic hyphae from endolithic cyanobacteria and algae. Endolithic microbes can, however, be distinguished based on their distribution, ecology, and morphology. According to a 2008 study, the endolithic fungi that formed on the eggshells would have resulted in the abnormal incubation of the eggs and may have killed the embryos in infected eggs of these dinosaurs. It may also have led to the preservation of dinosaur eggs, including some that contained embryos.
== Meat == The most commonly consumed meat in China is pork. As of at least 2024, China is the second largest beef consuming market in the world. Steakhouses and hot pot restaurants serving beef are becoming increasingly popular in urban China. Chinese consumers particularly value freshly slaughtered beef.
Febris (fever in Latin) is the goddess of fever in Roman mythology. People with fevers would visit her temples. Tertiana and Quartana are the goddesses of tertian and quartan fevers of malaria in Roman mythology. Jvarasura (fever-demon in Hindi) is the personification of fever and disease in Hindu and Buddhist mythology.
== Other products produced == The main products of malolactic fermentation are lactic acid, diacetyl, acetic acid, acetoin, and various esters. The amount and exact nature of these products depends on the species/strain of LAB conducting the malolactic fermentation and the condition influencing that wine (pH, available nutrients, oxygen levels, etc.). Some strains of O. oeni can synthesize higher alcohols which can contribute to fruity notes in the aroma of the wine. Additionally, some strains of the bacterium have beta-glucosidase enzymes that can break down monoglucosides which are aroma compounds attached to a sugar molecule. When the sugar component is cleaved, the rest of the compound becomes volatilized, meaning it can potentially be detected in the aroma bouquet of the wine. In the early 21st century, some strains of O. oeni were shown to use acetaldehyde by breaking it down into ethanol or acetic acid. While this may help for wines with excessive levels of acetaldehyde, for red wines, it can also destabilize the color of the wine by interfering with acetaldehyde's reaction with anthocyanins to create polymeric pigments that help create a wine's color.
== Animal models == Current research on synthetic platelets primarily in preclinical phases of clinical trials, relying on animal models to test their safety, efficacy, and hemostatic performance in relevant therapeutic areas. In one study, researchers evaluated the efficacy of platelet-mimicking procoagulant nanoparticles (PPNs) using various animal models. In a mouse model of thrombocytopenia, induced by administering an anti-CD42b antibody to reduce platelet counts, PPNs were introduced and demonstrated a reduction in bleeding comparable to that achieved with syngeneic platelet transfusions. Additionally, in a rat model of acute liver injury and a mouse model of hemorrhagic trauma, treatment with PPNs led to decreased blood loss and improved survival rates compared to control groups receiving saline or control nanoparticles. These findings suggest that PPNs effectively mimic natural platelet functions, enhancing hemostasis in scenarios of significant bleeding.
Sources: en.wikipedia.org
== Methods == Prohibited methods include manipulation of blood components (e.g. autologous red blood cell transfer, "blood doping"), manipulation of samples, and gene doping. These are prohibited at all times.
Saint Kitts and Nevis - The Scout Association of Saint Kitts and Nevis* Tonga - Tonga branch of The Scout Association* Tuvalu - Tuvalu Scout Association* Vanuatu - Vanuatu branch of The Scout Association* Served by Scouts Australia
=== Enhanced excretion === In some situations elimination of the poison can be enhanced using diuresis, hemodialysis, hemoperfusion, hyperbaric medicine, peritoneal dialysis, exchange transfusion or chelation. However, this may actually worsen the poisoning in some cases, so it should always be verified based on what substances are involved.
16 February – Former footballer Ciaran Dickson is sentenced to six years in prison by the High Court in Glasgow for the hit-and-run killing of Aidan Pilkington in September 2021, when he was more than three times over the drink drive limit. Scotland is to scrap its Super 6 rugby series and reinstate a national "A team" as part of a comprehensive restructuring programme. 17 February – Delegates at the Scottish Labour Party conference pass a resolution calling for an immediate ceasefire in Gaza. Two men are killed in a road traffic accident involving three cars on the B9077 in Maryculter, Aberdeenshire. 20 February – Heather Woodbridge, aged 29, is appointed as leader of Orkney Islands Council, becoming Scotland's youngest council leader and the first woman to lead Orkney Islands Council. The BBC announces plans to reshape the BBC Scotland TV channel, including axing the hour-long news programme The Nine and replacing it with a 30-minute programme. 22 February – Argyll and Bute Council votes to raise its council tax by 10%, and rejects the Scottish Government's council tax freeze by doing so. 23 February – The Scottish Government publishes draft legislation proposing a ban on the sale of disposable vapes in Scotland by 1 April 2025. 24 February – Police Scotland begins an investigation after burnt human remains are found near Motherwell Football Club. 25 February – The Scottish Government confirms that Economy Secretary Màiri McAllan, who is pregnant, will take maternity leave during the summer, becoming the second Scottish Government minister to do so.
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.
Glutathione is a tripeptide of three amino acids: glutamate, cysteine, and glycine. The cysteine residue provides the sulfhydryl group that gives the molecule its reducing properties.