Everything below concerns redox status. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-06-24. Numbers and descriptions here follow the published literature rather than marketing material.
Measuring glutathione requires attention to oxidation during sample handling, because GSH in biological samples can convert to GSSG or form mixed disulfides with proteins after collection. Acidic extraction, rapid cooling, and chelating agents are commonly used to limit such changes. Analytical methods usually distinguish free reduced glutathione, total glutathione, and protein-bound forms. Because these forms have different stability and reactivity, reported values depend heavily on the preparation protocol. No single preparation is universally suitable for every biological matrix or analytical goal.
Several techniques are used for quantification. Enzymatic recycling assays rely on glutathione reductase and a colorimetric or fluorescent readout, offering sensitivity for total glutathione. High-performance liquid chromatography can separate GSH from GSSG and other thiols, often with UV, fluorescence, or electrochemical detection. Mass spectrometry provides structural confirmation and can quantify low-abundance species when paired with separation. Each approach has trade-offs in specificity, throughput, and equipment requirements, so method selection depends on the research question and available instrumentation.
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.
| Property | Value | Notes |
|---|---|---|
| Reduced form | GSH | Main intracellular thiol |
| Oxidized form | GSSG | Disulfide dimer of two GSH molecules |
| Common separation method | Reversed-phase HPLC | Often with ion-pairing or derivatization |
| Typical detection | Fluorescence or mass spectrometry | UV detection is also used in some assays |
| Storage of standards | -20 °C or below, desiccated | Limit freeze-thaw and moisture exposure |
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.
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.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine, and it is the most abundant non-protein thiol in most living cells. The reduced form, GSH, carries a sulfhydryl group that can donate electrons, while the oxidized form, GSSG, forms when two GSH molecules link via a disulfide bond. The balance between these two forms helps define the cellular redox environment, and their ratio is often used as an indicator of oxidative stress. Because the sulfhydryl group is reactive, glutathione participates in many cellular processes, including detoxification and protein regulation.
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.
Baylor University sexual assault scandal – in 2016, Baylor and its football program were rocked by the revelation that university officials failed to act on numerous alleged sexual and non-sexual assaults by football team members between 2012 and 2016, with one player convicted of felony sexual assault. A later lawsuit filed by a group of victims alleged that 31 football players committed 52 rapes between 2011 and 2014. In the wake of the scandal, head football coach Art Briles was fired, athletic director Ian McCaw resigned, and university president Ken Starr was first demoted and then resigned. 2017–18 NCAA Division I men's basketball corruption scandal – An ongoing FBI investigation into corruption in NCAA men's basketball that has so far resulted in the arrest of 10 individuals, including college assistant coaches from Arizona, Auburn, Oklahoma State, and USC plus high-ranking executives of sports apparel giant Adidas. Other programs initially implicated in the scandal included Louisville, Miami (FL), and South Carolina. Louisville placed head coach Rick Pitino and athletic director Tom Jurich (the latter not directly involved in the scandal) on administrative leave, and soon fired both. Further revelations in February 2018 saw more than a dozen additional programs possibly implicated.
=== 1960s–1980s === For several petty crimes, sixteen-year-old Olofsson was placed in a behavioural institution for young offenders in 1963. Olofsson and two other boys escaped from the institution in August 1965 and entered the country estate of Swedish Prime Minister Tage Erlander at Harpsund, where they stole grapes, cucumbers, and tomatoes from the greenhouse. They fled when the gardener discovered them. Three months later, Olofsson assaulted two police officers in Eskilstuna. On 4 February 1966, he was sentenced to three years in prison; this was his third sentence and his first real prison sentence. In late 1966, he made his first escape from the prison at Tidaholm. On 29 July 1966, police officers Ragnar Sandahl and Lennart Mathiasson responded to a burglary at a bicycle shop at Skjutsaregatan in Nyköping. Sandahl was shot and killed by Gunnar Norgren. The other burglar was Olofsson, who became a nationally known criminal. Norgren was arrested on 16 August that year in an apartment at Utåkersgatan 4 in Kålltorp, Gothenburg, and later confessed to the murder. The apartment belonged to a boyfriend of Olofsson's sister. Norgren gave up after the police fired several shots through the door to the apartment. Olofsson had escaped from the apartment before police entered and managed to elude them for two weeks but was eventually arrested on 25 August in Grimmaredsskogen in Västra Frölunda. Via telephone tapping, the police found out that Olofsson and his 20-year-old girlfriend were to meet at a special mountain hill in Grimmaredsskogen.
=== Inductive cleavage === This reaction results from the inductive effect of the radical sites, as depicted below. This reaction is defined as a heterolytic cleavage since a pair of electrons is transferred. The driving forces for such reaction are the electronegativities of the radical sites: halogens > O, S >> N, C. this reaction is less favored than radical-site reactions.
Sources: en.wikipedia.org
== Diagnosis == Diagnosis is fourfold: History and physical examination, elevation of creatine kinase, electromyograph (EMG) alteration, and a positive muscle biopsy. The hallmark clinical feature of polymyositis is proximal muscle weakness, with less important findings being muscle pain and dysphagia. Cardiac and pulmonary findings will be present in approximately 25% of cases of patients with polymyositis. Sporadic inclusion body myositis (sIBM) is often misdiagnosed as polymyositis or dermatomyositis but it can be differentiated as myositis that does not respond to treatment is likely IBM. sIBM comes on over months to years; polymyositis comes on over weeks to months. Polymyositis tends to respond well to treatment, at least initially; IBM does not.
==== Negative health impact ==== Some nutritionists have criticized chocolate milk for its high sugar content and its relationship to childhood obesity. Because chocolate milk can contain twice as much sugar as plain low-fat milk from added sugars, some school districts have stopped serving the product altogether.
=== Campaign expenditures === According to First Amendment scholar Floyd Abrams, the act "was the first law barring unions and corporations from making independent expenditures in support of or [in] opposition to federal candidates".
Balances for accurately measuring materials. Laboratory glassware, such as burettes and pipettes, for performing titrations. Colorimeters for solution tests which apply the Beer–Lambert law. Spectrophotometer to measure the concentrations of the key parameter nitrate and other nutrients, such as phosphate, sulfate or iron. Containers for growing and storing the plants. Using chemical equipment for hydroponic solutions can be beneficial to growers of any background because nutrient solutions are often reusable. Because nutrient solutions are virtually never completely depleted, and should never be due to the unacceptably low osmotic pressure that would result, re-fortification of old solutions with new nutrients can save growers money and can control point source pollution, a common source for the eutrophication of nearby lakes and streams.
Sources: en.wikipedia.org
Accessory nail of the fifth toe Accessory tragus (ear tag, preauricular appendage, preauricular tag) Amniotic band syndrome (ADAM complex, amniotic band sequence, congenital constriction bands, pseudoainhum) Aplasia cutis congenita (cutis aplasia, congenital absence of skin, congenital scars) Arteriovenous fistula Benign neonatal hemangiomatosis Branchial cyst (branchial cleft cyst) Bronchogenic cyst Capillary hemangioma (infantile hemangioma, nevus maternus, strawberry hemangioma, strawberry nevus) Cavernous venous malformation Congenital cartilaginous rest of the neck (cervical accessory tragus, wattle) Congenital erosive and vesicular dermatosis Congenital hypertrophy of the lateral fold of the hallux Congenital lip pit (congenital sinus of the lower lip, lip sinus, midline sinus of the upper lip) Congenital malformations of the dermatoglyphs Congenital smooth muscle hamartoma Cystic lymphatic malformation Dermoid cyst Diffuse neonatal hemangiomatosis Encephalocele Familial disseminated comedones without dyskeratosis Focal facial dermal dysplasia Hutchinson's teeth Hyperkeratotic cutaneous capillary-venous malformation Intrauterine epidermal necrosis Limb–mammary syndrome Lowry–MacLean syndrome Macrocheilia Macrocystic lymphatic malformation Malignant pilomatricoma (pilomatrical carcinoma, pilomatrix carcinoma) Maternal autoimmune bullous disease Median raphe cyst Melanotic neuroectodermal tumor of infancy Membranous aplasia cutis Microcystic lymphatic malformation Midline cervical cleft Mongolian spot (congenital dermal melanocytosis, dermal melanocytosis) Mulberry molar Nager acrofacial dysostosis Nasal glioma (brain-like heterotopia, cephalic brain-like heterotopia, glial hamartoma, heterotopic neuroglial tissue, nasal cerebral heterotopia, nasal heterotopic brain tissue) Nasolacrimal duct cyst Nevus psiloliparus Non-involuting congenital hemangioma Omphalomesenteric duct cyst (omphalomesenteric duct remnant, vitelline cyst) PELVIS syndrome Pilomatricoma (calcifying epithelioma of Malherbe, Malherbe calcifying epithelioma, pilomatrixoma) Poland anomaly Posterior fossa malformations–hemangiomas–arterial anomalies–cardiac defects–eye abnormalities–sternal cleft and supraumbilical raphe syndrome (PHACE association, PHACES syndrome) Preauricular sinus and cyst (ear pit, congenital auricular fistula, congenital preauricular fistula, preauricular cyst) Rapidly involuting congenital hemangioma (congenital nonprogressive hemangioma) Rosenthal–Kloepfer syndrome Rudimentary supernumerary digit (rudimentary polydactyly) SACRAL syndrome Sinus pericranii Skin dimple (skin fossa) Superficial lymphatic malformation (lymphangioma circumscriptum) Supernumerary nipple (accessory nipple, pseudomamma) Thyroglossal duct cyst Verrucous vascular malformation (angiokeratoma circumscriptum naeviforme)
== Further reading == Carson C, Faria G, Hellstrom WJ, Krishnamurti S, Minhas S, Moncada I, et al. (1 January 2010). "Implants, Mechanical Devices, and Vascular Surgery for Erectile Dysfunction". Journal of Sexual Medicine. 7 (1). Wiley: 501–523. doi:10.1111/j.1743-6109.2009.01626.x. PMID 20092450.
Dredd is a 2012 science fiction action film directed by Pete Travis and written and produced by Alex Garland. It is based on the 2000 AD comic strip Judge Dredd and its eponymous character created by John Wagner and Carlos Ezquerra. Karl Urban stars as Judge Dredd, a law enforcer given the power of judge, jury, and executioner in a vast, dystopic metropolis called Mega-City One that lies in a post-apocalyptic wasteland. Dredd and his rookie partner, Judge Anderson (Olivia Thirlby), are forced to bring order to a 200-storey high-rise block of apartments and deal with its resident drug lord, Ma-Ma (Lena Headey). Garland began writing the script in 2006, although the development of a new Judge Dredd film adaptation, unrelated to the 1995 film Judge Dredd, was not announced until December 2008. Produced by British studio DNA Films, Dredd began principal photography, using 3D cameras throughout, in November 2010. Filming took place on practical sets and locations in Cape Town and Johannesburg. Dredd was released on 7 September 2012 in the United Kingdom and on 21 September worldwide. Critics were generally positive about the film's visual effects, casting and action sequences, while criticism focused on excessive violence as well as a perceived lack of the satirical elements that are found in the source comic. Despite the positive critical response, the film earned just over $41 million at the box office on an estimated budget of $30–45 million.
== Implementation == In one of various embodiments of EWOD-based microfluidic biochips, investigated first by Cytonix in 1987 and subsequently commercialized by Advanced Liquid Logic, there are two parallel glass plates. The bottom plate contains a patterned array of individually controllable electrodes and the top plate is coated with a continuous grounding electrode. A dielectric insulator coated with a hydrophobic is added to the plates to decrease the wet-ability of the surface and to add capacitance between the droplet and the control electrode. The droplet containing biochemical samples and the filler medium, such as the silicone oil, a fluorinated oil, or air, are sandwiched between the plates and the droplets travel inside the filler medium. In order to move a droplet, a control voltage is applied to an electrode adjacent to the droplet, and at the same time, the electrode just under the droplet is deactivated. By varying the electric potential along a linear array of electrodes, electrowetting can be used to move droplets along this line of electrodes.
It also stated that a laboratory origin for the virus was "extremely unlikely". WHO director-general Tedros Adhanom Ghebreyesus, in concert with various governments including the US and the EU, responded to the 2021 study report saying the matter still "requires further investigation". In July 2021, Zeng Yixin, Vice Health Minister of the Chinese National Health Commission, said that China would not participate in a second phase of investigation, denouncing the decision to proceed as "shocking" and "arrogant". In June 2022, a second round of investigations concluded that more investigations in the various possible pathways of emergence were necessary. In response to the WHO's June 2022 report, Chinese Foreign Ministry spokesperson Zhao Lijian called the lab leak theory "a lie concocted by anti-China forces for political purposes, which has nothing to do with science".
Sources: en.wikipedia.org
Common methods include enzymatic recycling assays, liquid chromatography, and mass spectrometry. Many protocols separate reduced glutathione from its oxidized disulfide form before detection.
The ratio compares reduced glutathione with its oxidized dimer. It is used as an indicator of redox status, although the value depends strongly on sample handling and analytical method.
Glutathione can oxidize quickly after a sample is collected. Acidification, cooling, and chelators are often used to reduce artifactual changes before analysis.
Chromatographic methods can separate the two forms before detection. Enzymatic assays often measure total glutathione first and then use a separate procedure to estimate the oxidized fraction. The difference between total and oxidized amounts provides an indirect estimate of the reduced form.