This is a working overview of redox balance, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-10-06. Anything still debated is marked as such rather than presented as settled.
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 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.
Quality control for glutathione focuses on identity, purity, and oxidation state. Certificates of analysis may report assay value, water content, and the presence of GSSG or other impurities. Chromatographic purity is often expressed as a percentage of peak area. Reference standards help laboratories compare results across instruments and batches. Because glutathione is a small, polar molecule, separation from cysteine, gamma-glutamylcysteine, and related thiols can be challenging. Verification often combines more than one analytical technique.
Measuring glutathione requires attention to sample preparation because the molecule oxidizes readily. Blood, tissue, and cell samples are often treated with acid to precipitate proteins and stabilize the thiol. Without such steps, GSH can convert to GSSG or form mixed disulfides during storage. Analytical methods include spectrophotometric assays, high-performance liquid chromatography, and mass spectrometry. Each approach has different sensitivity, specificity, and susceptibility to interference from related compounds in complex matrices.
For solid glutathione, storage conditions affect shelf life. The reduced form is typically kept cool, dry, and protected from air and light. Moisture can promote oxidation, while elevated temperatures accelerate degradation. Suppliers often specify storage at or below freezing, sometimes under inert gas. Solutions are less stable than powders and may require preparation shortly before use. Buffers and chelating agents can slow oxidation, but they do not eliminate it. Published stability data vary with matrix, pH, and container.
| 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 |
Cells synthesize glutathione through two ATP-dependent enzymatic steps. The first step combines glutamate and cysteine to form gamma-glutamylcysteine, catalyzed by glutamate-cysteine ligase. The second step adds glycine, producing the complete tripeptide, catalyzed by glutathione synthetase. Glutathione itself can inhibit the first enzyme, providing negative feedback when levels are high. Because cysteine is often limiting, its availability influences how quickly the pathway proceeds. These reactions occur in the cytosol, and the resulting glutathione can be distributed to other compartments.
Glutathione functions in redox balance, detoxification, and sulfur amino acid storage. It participates in reactions that help maintain ascorbate and protein thiol status. The molecule serves as a cofactor for several enzymes, including glutathione peroxidases and glutathione S-transferases. These enzymes reduce peroxides and conjugate electrophiles, respectively. Glutathione also contributes to the metabolism of xenobiotics and to the transport of cysteine between tissues. How interorgan transport and tissue-specific regulation shape whole-body pools remains an active area of study.
Quality control for glutathione materials checks identity, assay, purity, water content, and disulfide content. Commercial products vary from research-grade powder to dietary supplements, and labels may not distinguish reduced from oxidized forms. In the United States, oral glutathione is commonly sold as a dietary supplement rather than an approved drug, while injectable forms fall under different rules and may require a prescription. Regulatory status differs by country. Analytical certificates, when available, help verify what a material contains, but independent testing remains important for interpretation.
Laboratory measurement of glutathione typically starts with rapid acid extraction to prevent oxidation and enzymatic degradation. Common methods include enzymatic recycling assays, high-performance liquid chromatography, and liquid chromatography coupled with mass spectrometry. The recycling assay uses glutathione reductase and a thiol-reactive colorimetric or fluorescent reagent, measuring total glutathione after converting disulfide forms. Chromatographic methods can separate reduced and oxidized forms, which helps when the redox ratio is the target. Choice of method affects sensitivity, specificity, and the amount of sample needed.
In cells, glutathione helps maintain the reducing environment of the cytosol and supports enzymes that counteract reactive oxygen species. It acts as a cofactor for glutathione peroxidases, which reduce hydrogen peroxide and lipid peroxides, and for glutathione S-transferases, which conjugate electrophiles. The ratio of GSH to GSSG is often used as an indicator of oxidative stress, although the ratio can vary by compartment and cell type. Glutathione also stores cysteine, an amino acid that can be limiting for protein synthesis and antioxidant defense.
Synthesis occurs in two ATP-dependent steps. The enzyme glutamate-cysteine ligase joins glutamate and cysteine to form gamma-glutamylcysteine, and glutathione synthetase adds glycine. The first step is rate-limiting and is influenced by cysteine availability and feedback inhibition by GSH. Breakdown involves gamma-glutamyl transferase and subsequent peptidases, which release constituent amino acids for reuse. Because turnover differs among tissues, measurements from blood, plasma, and tissues are not directly interchangeable. Research continues to clarify how compartment-specific pools are regulated in health and disease.
=== Cellulose nanocrystals === Cellulose nanocrystals (CNCs), or nanocrystalline cellulose (NCC), are highly crystalline, rod-like nanoparticles. They are usually covered by negatively charged groups that render them colloidally stable in water. They are typically shorter than CNFs, with a typical length of 100 to 1000 nanometers.
== June 21, 1915 (Monday) == Gorlice–Tarnów Offensive — Grand Duke Nicholas Nicholaevitch ordered Russian forces to abandon Galicia. Gallipoli campaign — French artillery bombarded Ottoman 2nd Division holding Kereves Spur (Kervizdere), causing 6,000 casualties. French attacked and captured part of the crest but didn't break through to capture the second part until nine days later, at a cost of 2,500 casualties. Battle of Bukoba — British colonial forces from Kisumu in British East Africa raided Bukoba, German East Africa in an attempt to destroy its wireless station. Georgia Governor John M. Slaton released a 29-page report on the hearing of Leo Frank where he concluded there was sufficient new evidence not available at the original trial that cast doubt on Frank's guilt on the murder of Mary Phagan and ordered the death sentence to be commuted to life imprisonment. The U.S. Supreme Court ruled that separate state laws in Oklahoma and Maryland that exempted voters from literacy tests or poll taxes were unconstitutional since they were designed to be discriminating against black voters, and therefore in violation of the Fifteenth Amendment to the United States Constitution. Born: Ernest Llewellyn, Australian violinist and music educator, founding director of the ANU School of Music; in Kurri Kurri, New South Wales, Australia (d. 1982) Died: Addai Scher, 48, Turkish clergy, archbishop for the Chaldean Catholic Church in Siirt; killed in the Assyrian genocide (b. 1867)
subcellular localization 1. The subdivision of the interior of a cell into functionally distinct spaces or compartments (e.g. membrane-bound organelles) and the delegation of particular cellular functions and activities to these particular spaces. 2. The determination by any of various laboratory methods (e.g. fluorescent labelling) of the precise location(s) within a cell where a specific molecule has occupancy, or at which a specific activity occurs.
Unlike graphene, which is a two-dimensional semimetal, carbon nanotubes are either metallic or semiconducting along the tubular axis. For a given (n,m) nanotube, if n = m, the nanotube is metallic; if n − m is a multiple of 3 and n ≠ m, then the nanotube is quasi-metallic with a very small band gap, otherwise the nanotube is a moderate semiconductor. Thus, all armchair (n = m) nanotubes are metallic, and nanotubes (6,4), (9,1), etc. are semiconducting. Carbon nanotubes are not semimetallic because the degenerate point (the point where the π [bonding] band meets the π* [anti-bonding] band, at which the energy goes to zero) is slightly shifted away from the K point in the Brillouin zone because of the curvature of the tube surface, causing hybridization between the σ* and π* anti-bonding bands, modifying the band dispersion. The rule regarding metallic versus semiconductor behavior has exceptions because curvature effects in small-diameter tubes can strongly influence electrical properties. Thus, a (5,0) SWCNT that should be semiconducting in fact is metallic according to the calculations. Likewise, zigzag and chiral SWCNTs with small diameters that should be metallic have a finite gap (armchair nanotubes remain metallic). In theory, metallic nanotubes can carry an electric current density of 4 billion A/cm2, which is more than 1,000 times greater than those of metals such as copper, where for copper interconnects, current densities are limited by electromigration.
=== 18 July === In Crimea, the Russian-installed governor of Sevastopol claimed that a naval drone was intercepted while attempting to attack the city. SBU naval and aerial drones also attacked a Russian coast guard base on Lake Donuzlav during a Russian naval exercise, hitting the base headquarters, ammunition depot, a power substation and technical facilities. Ukraine claimed to have shot down a Russian drone over Kyiv with no casualties recorded. The Freedom of Russia Legion claimed to have launched an attack on the Bolshoye Savino airport in Perm hosting MiG-31 fighters. A video released showed two KAMAZ trucks burning, with the group claiming to have destroyed “several units of military equipment.” Ukrainian Prime Minister Denys Shmyhal announced the extension of a system to jam Russian TV and radio broadcasts into Donetsk, Mykolaiv, Kherson, and Zaporizhzhia Oblasts.
Sources: en.wikipedia.org
Isobaric tags for relative and absolute quantitation (iTRAQ) is an isobaric labeling method used in quantitative proteomics by tandem mass spectrometry to determine the amount of proteins from different sources in a single experiment. It uses stable isotope labeled molecules that can be covalent bonded to the N-terminus and side chain amines of proteins.
=== Pharmacokinetics === Absorption of topical corticosteroids depends on several factors such as the vehicle, or delivery system used by the drug, the integrity of the epidermal barrier, and whether or not an occlusive bandage is used in combination with the drug. The absorption of topical betamethasone dipropionate is theoretically minuscule; however, if absorbed it follows the same pharmacokinetic profile as is typical of systemic corticosteroids. It is metabolized primarily by the liver by hydrolysis to its metabolites betamethasone 17-monopropionate (primary) and betamethasone and the 6β-hydroxy derivatives of those metabolites, and it is excreted primarily by the kidneys.
Honey is 17% water and 82% carbohydrates, and has negligible content of dietary fiber and protein, while containing no fat (table). Honey supplies no micronutrients in significant content (table). In a reference amount of 100 g (3.5 oz), honey supplies 300 calories.
Morris Carstairs, in a report on culture and personality study, stated that Indian men who are seemingly healthy are preoccupied with real or imagined spermatorrhea, with the belief that semen is not easily formed and "it takes 40 days, and 40 drops of blood, to make one drop of semen". He observed that when sexual behaviours are restricted, sexual incontinence follows with resultant guilt. In females, the corresponding fear of loss of sexual fluids is found in anxieties over vaginal discharge (sravam), which is believed to be a cooling body lubricant but whose loss leaves them "overheated and disarticulated, in a state of disease." Anxiety about loss of sexual fluids is caused from a misdiagnosis of sexual guilt, instead of correcting the psyche of a person the focus is shifted onto the substance (semen, sravam), resulting in subsequent pathologization. In Ayurveda, the term generally used for both male semen and female egg cell is Shukra. People with healthy shukra appear stronger and confident, with eyes and skin that seem lustrous. Those who lack higher shukra appear exhausted and lackluster, while also struggling in creative endeavours. Drinking lots of water and proper digestion of highly nourishing foods (milk, ghee, nuts) yield healthy shukra. Charaka states brahmacharya (abstinence), proper diet, and rest/sleep as the three pillars of life.
Sources: en.wikipedia.org
== Environmental record == According to the 2022 "Top 100 Polluters Indexes" published by the University of Massachusetts, Amherst's "Political Economy Research Institute" (PERI), BASF was ranked the #2 largest polluter of air and #14 largest polluter of water in 2020, the most recent year for which data is available from the U.S. Environmental Protection Agency. In 2006, BASF was included in the Climate Leadership Index for their efforts in relation to climate change and greenhouse gas emissions. The BASF Company and Columbia University formed a partnership to further research "environmentally benign and sustainable energy sources". The company has recently reported their emissions in 2006 to be "1.50 million metric tons of waste," which is a decrease from previous years. The amount of waste BASF produces has continued to fall. While BASF publishes its environmental information in the US and Europe, Greenpeace has expressed deep concerns at BASF's refusal to release environmental information on its operations in China. In May 2009, a BASF Plant in Hannibal, Missouri, United States, accidentally discharged chromium into the Mississippi River. The local Department of Natural Resources performed tests in December 2009 showing the chromium levels did not exceed regulatory safety limits. BASF worked with the Missouri Department of Natural Resources (MoDNR) to resolve questions regarding the elevated level of hexavalent chromium that was detected in the effluent from one of its permitted outfalls into the Mississippi River.
Earlier estimates for snakebite vary from 1.2 to 5.5 million, with 421,000 to 2.5 million being envenomings, and causing 20,000 to 125,000 deaths. More recent modelling estimates that in 2019, about 63,400 people died globally from snakebite, with 51,100 of these deaths happening in India. Since reporting is not mandatory in much of the world, the data on the frequency of snakebites is not precise. Many people who survive bites have permanent tissue damage caused by venom, leading to disability. Most snake envenomings and fatalities occur in South Asia, Southeast Asia, and sub-Saharan Africa, with India reporting the most snakebite deaths of any country. Available evidence on the effect of climate change on the epidemiology of snakebite is limited but it is expected that there will be a geographic shift in the risk of snakebite: northwards in North America and southwards in South America and Mozambique, and increase in the incidence of bite in Sri Lanka. Most snakebites are caused by non-venomous snakes. Of the roughly 3,000 known species of snake found worldwide, only 15% are considered dangerous to humans. Snakes are found on every continent except Antarctica. The most diverse and widely distributed snake family, the colubrids, has approximately 700 venomous species, but only five genera—boomslangs, twig snakes, keelback snakes, green snakes, and slender snakes—have caused human fatalities. Worldwide, snakebites occur most frequently in the summer season when snakes are active and humans are outdoors.
=== Phase 2 clinical trial – Covid-19 / SARS-CoV-2 === The Brilacidin trial for the treatment of COVID-19 infection has started in February 2021 and is expected to be completed in July 2021. The study is a randomized, blinded, placebo-controlled, parallel group design and will accept 120 patients. The placebo or drug will be administered via IV infusion to patients with moderate to severe COVID-19, SARS-CoV-2 infection confirmed by positive standard polymerase chain reaction test (or equivalent/ other approved diagnostic test) within 4 days prior to starting study treatment, and hospitalized with respiratory distress but not yet requiring high-level respiratory support.
In inhibitory synapses, the opening of either Cl- or K+ channels diminish the probability of depolarization in postsynaptic neurons and the initiation of an action potential. Astrocytes also exchange information with the synaptic neurons, responding to synaptic activity and, in turn, regulating neurotransmission.
== History == Founded in 1993 by Jack Owoc, Bang's parent company manufactured and distributed sports supplements and performance beverages under the brand name VPX. Other products distributed by Vital included Redline, Noo Fuzion, and Meltdown. In 2012, Vital created Bang, marketed as a low sugar carbonated energy drink and with the mission to make high-quality nutritional supplements backed by scientific research. In 2017, it was announced that Bang would offer a caffeine-free variant of the beverage, using beta-alanine in place of caffeine. In 2019, the company opened a manufacturing and distribution facility in Phoenix, Arizona, which operates alongside their facility in Pembroke Pines, Florida. In April 2020, PepsiCo entered into an exclusive distribution agreement with VPX to distribute Bang in the United States. On November 17, 2020, it gave PepsiCo a notice of termination; an emergency arbitrator ruled in December 2020 that Pepsi remained the exclusive distributor of Bang drinks until 2023. VPX resolved their disputes with PepsiCo and transitioned away from their distribution in June 2022. In August 2022, it was reported that Keurig Dr Pepper was in talks to purchase VPX; these talks fell apart shortly after the reports surfaced. On October 10, 2022, Bang's parent company filed for Chapter 11 bankruptcy protection. Three months after Owoc was removed and John DiDonato was named interim CEO of VPX, Monster Beverage reached an agreement for its purchase on June 28, 2023, this was completed one month later.
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.
Common methods include spectrophotometric enzyme cycling assays, HPLC with UV or fluorescence detection, and LC-MS/MS. Detection often requires derivatization because glutathione lacks a strong chromophore. Method choice depends on the sample type and the required sensitivity.