INTRODUCTION
Methylene blue (MB), a basic thiazine dye has been used clinically for about a century to treat numerous ailments. Primarily used in the treatment of methemoglobinemia, as an antidote in cyanide poisoning, as a biological stain, and as an oxidant-reduction indicator.
The intravenous form of MB is approved by the FDA for the treatment of pediatric and adult patients with acquired methemoglobinemia. MB is an investigational drug being developed by the University of Aberdeen and TauRx Therapeutics that has been shown in early clinical trials to be an inhibitor of Tau protein aggregation. The drug is also of potential interest for the treatment of patients with Alzheimer’s disease.
| Synonyms | Methylthioninium chloride Basic blue 9 (C.I. 52015) |
| CAS no. | 122965-43-9 (hydrate) 7220-79-3 (trihydrate) 61-73-4 (anhydrous) |
| EINECS no. | 602-909-3 (hydrate) 615-731-6 (trihydrate) 200-515-2 (anhydrous) |
| Molecular formula | C16H18N3S.Cl.xH2O |
| Molecular weight | 337.90 (hydrate & trihydrate) 319.85 (anhydrous) |
| Structure |  |
MEDICAL APPLICATIONS
| Methemoglobinemia | MB is employed as a medication for the treatment of methemoglobinemia |
| Combined with light | MB combined with light has been used to treat resistant plaque psoriasis |
| Urinary tract infection | MB is a component of a urinary analgesic/anti-infective/anti-spasmodic known as “Prosed DS”, a combination of phenyl salicylate, benzoic acid, hyoscyamine sulfate, and methenamine (aka hexamethylenetetramine and not to be confused with ‘methanamine’) |
| Cyanide poisoning | Since its reduction potential is similar to that of oxygen and can be reduced by components of the electron transport chain, large doses of methylene blue are sometimes used as an antidote to potassium cyanide poisoning |
| Dye or stain | MB is used in endoscopic polypectomy as an adjunct to saline or epinephrine and is used for injection into the submucosa around the polyp to be removed |
| Placebo | MB has been used as a placebo; physicians would tell their patients to expect their urine to change color and view this as a sign that their condition had improved |
| Ifosfamide toxicity | Another use of methylene blue is to treat Ifosfamide neurotoxicity |
| Shock | It has also been used in septic shock and anaphylaxis |
OTHER APPLICATIONS
| Redox indicator | MB is widely used as a redox indicator in analytical chemistry |
| Peroxide generator | MB is also a photosensitizer used to create singlet oxygen when exposed to both oxygen and light |
| Biological staining | In biology MB is used as a dye for number of different staining procedures, such as Wright’s stain and Jenner’s stain. Since it is a temporary staining technique, MB can also be used to examine RNA or DNA under the microscope or in a gel |
| Aquaculture | MB is used in aquaculture and by tropical fish hobbyists as a treatment for fungal infections |
Modes of action of Methylene Blue in SARS-CoV-2 infection complications (as per the current ongoing studies. Concrete data to be available soon)
| It inhibits SARS-CoV-2 spike ACE2 protein – protein interaction |
| To treat Cytokinin Storm which is one of the major reason for ADRs, Multiorgan Failure & Mortality |
| It relieves oxidative stress, ROS and free radicals |
| It increases systemic vascular resistance (SVR) in septic shock |
| It causes antifibrotic action in lungs |
SPECIFICATIONS
MB offered by Exsyn complies USP & EP pharmacopeia. Please ask our sourcing team if you need detailed specifications.
WRITTEN CONFIRMATION (WC)
ExSyn offers MB with WC certification, so it can be sold to the EU as an API for human consumption.
STORAGE
Temporary storage temperature is below 30°C
Long term storage temperature is 5°C ± 3°C
ExSyn offers MB on commercial scale and welcomes enquiries. No matter the quantity you need, our exceptional quality and service will make ExSyn your supplier of choice! If you need any additional information or SDS, please get in touch with us.
Adenosine is a naturally occurring purine nucleoside composed of adenine and ribose, present in all living cells. It plays a vital role in biochemical processes such as energy transfer (ATP/ADP), signal transduction, and regulation of physiological functions, and is widely used in pharmaceutical applications.
Methyl-2-Methoxy-5-Sulfamoyl Benzoate (MSMB) is a sulfur containing organic building block acting as a chemical intermediate. MSMB contains ester and sulfamoyl functional groups, which make it useful as a pharmaceutical and fine-chemical intermediate.
Imidazolidinyl urea is a widely used antimicrobial preservative in the cosmetic and personal care industry. It is a formaldehyde-releasing compound that effectively inhibits the growth of bacteria, yeast, and molds, thereby extending the shelf life of formulations. Due to its broad-spectrum efficacy and cost-effectiveness, it is commonly used in rinse-off and leave-on products within regulated concentration limits.
Phosphorodiamidites are a unique class of phosphorus-based compounds characterized by one P–O bond and two P–N moieties. 2-Cyanoethyl tetraisopropylphosphorodiamidite plays a crucial role in solid-phase oligonucleotide synthesis. Beyond their application as synthetic precursors for oligonucleotides, phosphorodiamidites have also been reported as valuable starting materials for the synthesis of industrially relevant polymers and flame-resistant materials, including adhesives, coatings, and laminates.
Ferric maltol is an oral iron complex composed of ferric iron (Fe³⁺) chelated with maltol, designed to improve iron absorption while reducing common gastrointestinal side effects associated with traditional iron salts. It is primarily used in the management of iron deficiency with better tolerability.
Phosphatidylcholine (PC) is one of the most important phospholipids derived from soya lecithin and represents a key structural component of cell membranes. Phosphatidylcholine 90% refers to a highly purified grade where the PC content is enriched to around 90% through specialized extraction and purification steps.
Indorez® Kota Resin is a modified non self-cured phenolic resin, it can increase rubber adhesion to steel, polyester, rayon, nylon, aramid and other fabric cord. It’s an adhesive agent, acts as methylene acceptor, can 100% replace resorcinol and resorcinol resins in resorcinol- formaldehyde-silica, enhance adhesion between rubber and reinforcing materials.
Glyceryl Stearate Citrate (GSC) is a plant-derived, biodegradable emulsifier commonly used in cosmetics and personal-care products. It functions primarily as an anionic oil-in-water (O/W) emulsifier, helping blend oils and water into smooth, stable creams and lotions. Its natural origin and gentle profile make it popular in eco-certified, organic, and sensitive-skin formulations.
DL-Serine is a racemic mixture of both the D- and L-forms of the amino acid serine, which is a polar, nonessential amino acid. It is an α-amino acid characterized by its hydroxyl-containing side chain, which enables it to take part in numerous biochemical reactions and synthetic processes. It functions as a pivotal intermediate in the biosynthesis of amino acids, including glycine and cysteine, underscoring its essential role in cellular metabolism. Moreover, it constitutes a critical pharmaceutical intermediate for the synthesis of a broad spectrum of therapeutic agents and drug candidates.