Glutathione is a low-molecular-weight tripeptide composed of glutamate, cysteine, and glycine, and is the most abundant intracellular non-protein thiol in mammalian cells studied in research models. It is catalogued under CAS number 70-18-8, with a molecular formula of C₁₀H₁₇N₃O₆S and a molecular weight of approximately 307.32 g/mol. The compound is produced through solid-phase synthesis, supplied as a lyophilized powder, and is intended solely for laboratory research purposes, not for human use.
Within metabolic and redox biology research, Glutathione is studied primarily for its role as the principal intracellular buffer against oxidative stress and as a central node in cellular detoxification pathways. Its concentration and oxidation state — the ratio of reduced glutathione (GSH) to its oxidized dimer, glutathione disulfide (GSSG) — is one of the most widely used biomarkers of cellular redox status in published research, spanning mitochondrial physiology, xenobiotic metabolism, and performance-adjacent metabolic signaling studies.
Amino Zone catalogues Glutathione within its performance and metabolic research category, alongside compounds studied for their relevance to cellular energy metabolism, mitochondrial function, and oxidative-stress signaling in laboratory model systems.
What is the molecular structure of Glutathione?
Glutathione has a molecular weight of approximately 307.32 g/mol and a molecular formula of C₁₀H₁₇N₃O₆S, corresponding to the tripeptide γ-L-glutamyl-L-cysteinyl-glycine. Its most structurally distinctive feature is the peptide bond linking glutamate to cysteine: rather than the standard alpha-peptide linkage joining the alpha-carboxyl group of one amino acid to the alpha-amino group of the next, Glutathione's glutamate-cysteine bond forms through the gamma-carboxyl group of glutamate's side chain. This gamma-glutamyl linkage is atypical among peptides and is directly relevant to Glutathione's biological stability — it renders the molecule resistant to cleavage by most standard intracellular peptidases, which recognize and act on conventional alpha-peptide bonds.
The cysteine residue at the second position carries the free thiol (sulfhydryl) group that is the chemically reactive center of the molecule. This thiol is the site of the reversible oxidation reaction that defines Glutathione's redox function: two glutathione molecules can be oxidized to form a disulfide-bonded dimer, glutathione disulfide (GSSG), with the reaction reversible under appropriate enzymatic conditions. The glycine residue at the C-terminus completes the tripeptide and contributes to the molecule's substrate recognition by the enzymes that synthesize, regenerate, and utilize it.
Research-grade Glutathione is produced through solid-phase peptide synthesis, characterized by HPLC purity analysis and mass spectrometry identity confirmation, and supplied as a lyophilized white powder.
What is the glutathione redox cycle, and why is it a research target in metabolic biology?
The glutathione redox cycle describes the enzymatic interconversion between reduced glutathione (GSH) and its oxidized form (GSSG), and is one of the central regulatory circuits maintaining intracellular redox homeostasis in studied model systems. Glutathione peroxidase enzymes catalyze the oxidation of GSH to GSSG while reducing hydrogen peroxide or lipid peroxides to water or corresponding alcohols, directly coupling glutathione oxidation to the neutralization of reactive oxygen species. Glutathione reductase then catalyzes the reverse reaction, regenerating GSH from GSSG using NADPH as the electron donor, closing the cycle.
The ratio of GSH to GSSG — the glutathione redox ratio — is used extensively in published research as a quantitative indicator of cellular oxidative stress burden. A shift toward GSSG accumulation, reflecting either increased reactive oxygen species production or impaired NADPH-dependent regeneration capacity, is one of the most widely applied biomarkers in oxidative stress research across cell biology, toxicology, and metabolic physiology.
Because this cycle sits directly downstream of mitochondrial reactive oxygen species production — mitochondria being a principal site of endogenous oxidant generation through electron transport chain activity — Glutathione redox status is studied extensively in mitochondrial physiology research as an index of the balance between oxidant production and antioxidant capacity in cellular energy metabolism.
Intracellular glutathione concentration is not static; it is compartmentalized, with distinct GSH pools maintained in the cytosol, mitochondrial matrix, endoplasmic reticulum, and nucleus, each subject to somewhat different regulatory dynamics. The mitochondrial GSH pool in particular is studied separately from the cytosolic pool because mitochondria lack the enzymatic machinery for de novo glutathione synthesis and instead rely on dedicated transporters to import GSH synthesized in the cytosol. Research examining mitochondrial oxidative capacity frequently measures this compartment-specific pool directly, since cytosolic GSH:GSSG ratios do not necessarily track the mitochondrial matrix ratio under conditions of localized oxidant stress.
What enzymatic systems maintain glutathione homeostasis in cells?
Several distinct enzyme families interact with Glutathione and are frequent subjects of research alongside it. Glutathione peroxidases (GPx1 through GPx8 in the mammalian family) catalyze the primary peroxide-detoxification reaction described above, with different isoforms exhibiting distinct subcellular localization and substrate preferences — GPx1 is broadly cytosolic and mitochondrial, while GPx4 is distinguished by its capacity to directly reduce complex lipid hydroperoxides within membranes, a function studied in the context of a form of regulated cell death termed ferroptosis.
Glutathione-S-transferases (GSTs) catalyze the conjugation of GSH to electrophilic substrates, including reactive metabolic intermediates and xenobiotic compounds, forming glutathione conjugates that are processed through subsequent detoxification and excretion pathways. This conjugation reaction is a central mechanism in phase II xenobiotic metabolism research.
Gamma-glutamylcysteine synthetase (glutamate-cysteine ligase) catalyzes the rate-limiting step of de novo glutathione biosynthesis, forming the gamma-glutamylcysteine dipeptide precursor from glutamate and cysteine. Its activity is regulated in part through the Nrf2 transcription factor pathway, which upregulates glutathione synthesis and related antioxidant enzyme expression in response to oxidative or electrophilic stress signals — a signaling axis extensively studied in metabolic and toxicological research contexts.
What research contexts use Glutathione as a research tool?
Glutathione appears across several distinct research program types connected by its central role in cellular redox regulation.
Mitochondrial oxidative stress research. Because mitochondrial electron transport chain activity is a principal endogenous source of reactive oxygen species, Glutathione redox status is used as a quantitative endpoint in research examining mitochondrial function, bioenergetic efficiency, and the cellular response to metabolic stress in cell culture and tissue-derived model systems.
Xenobiotic and drug metabolism research. Glutathione conjugation via GST-mediated reactions is a core pathway in phase II metabolism research, used to characterize how cells process and detoxify reactive metabolic intermediates generated during phase I oxidative metabolism of xenobiotic compounds.
Ferroptosis and lipid peroxidation research. The GPx4-glutathione axis is a focal point of research into ferroptosis, an iron-dependent, lipid-peroxidation-driven form of regulated cell death. Glutathione depletion is a standard experimental manipulation used to induce and study this pathway in cell-based models.
Cellular energy metabolism and exercise-adjacent physiology models. Research examining metabolic demand in muscle and other high-turnover tissue models has used glutathione redox status as a marker of oxidative burden associated with elevated mitochondrial throughput. Because reactive oxygen species production scales with electron transport chain flux, tissue and cell models subjected to increased metabolic demand are studied for corresponding shifts in the GSH:GSSG ratio, positioning Glutathione as a research tool relevant to performance-adjacent metabolic signaling investigations rather than a compound studied in isolation from energy metabolism.
Nrf2 pathway signaling research. Glutathione synthesis enzyme expression is a downstream readout used in research characterizing Nrf2-Keap1 pathway activation, a signaling axis relevant to cellular adaptive responses to oxidative and electrophilic stress across metabolic and toxicological research programs.
Amino Zone makes no therapeutic or outcome claims regarding Glutathione in any of these contexts. The compound is studied at the level of redox biochemistry and cellular signaling in laboratory model systems.
How does Glutathione's stability profile inform its research use?
Glutathione's atypical gamma-glutamyl bond confers meaningful resistance to standard peptidase cleavage, but the molecule's free thiol group remains chemically reactive and is the primary consideration in research handling. In aqueous solution, GSH is susceptible to auto-oxidation to GSSG on exposure to atmospheric oxygen, a reaction accelerated by trace metal catalysis and elevated pH. This is a relevant experimental variable in any research protocol relying on defined GSH:GSSG ratios, since solution-state auto-oxidation can shift the measured ratio independent of the biological process under study.
The lyophilized solid form is substantially more stable than reconstituted solution, which is why research-grade Glutathione is supplied and stored in lyophilized form at −20°C. Minimizing headspace oxygen exposure and avoiding repeated freeze-thaw cycles are standard practices for preserving the reduced-form fraction of stored material. This article does not provide reconstitution or preparation protocols; those are determined by the researcher according to experimental requirements.
How does Amino Zone supply and catalog Glutathione?
Amino Zone supplies Glutathione as a research-grade compound characterized by HPLC purity analysis and mass spectrometry identity confirmation, with batch-specific Certificates of Analysis available for every order. All shipments are cold-chain packaged as standard.
Glutathione sits within Amino Zone's performance and metabolic research category, alongside related compounds studied for cellular energy metabolism and oxidative-stress signaling. The full Amino Zone research compound catalog is available at all compounds. All material is intended for laboratory research use only. Not for human use.
This compound is a research chemical intended for laboratory and scientific research purposes only. It is not a drug, supplement, or food product, and is not intended to diagnose, treat, cure, or prevent any disease. Amino Zone does not sell products for human consumption. Researchers are responsible for compliance with all applicable local, state, and federal regulations governing the purchase and use of research materials.
