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Decades ago, chemists started chasing alternatives to classic anesthetics, especially in fields where localized numbing was crucial for research and diagnostics. Ethyl 3-aminobenzoate, better known in some circles by its other names like benzocaine or ethocaine derivatives, began to turn heads because it didn’t cause the same kind of systemic side effects found in many other numbing agents. As people put more demand on safety and performance in lab settings, tweaks kept coming. The combination with methanesulfonic acid made for a stable, easy-to-handle salt, locking down purity and avoiding issues with water solubility that used to plague earlier iterations. This wasn’t just a tweak for shelves either—it was a genuine response to the evolving understanding of working safely and effectively in both research and clinical work.
Now, every chemical has a list of specs as long as your arm, but folks in the lab care more about what something does than just the way it’s written on a drum. Ethyl 3-aminobenzoate methanesulfonic acid salt doesn’t just pop up in obscure catalogues; it’s a familiar face in research circles. The label might read “water-soluble, white to off-white powder, nominal molecular weight under 300,” but behind those specs is a reputation for reliability. Many chemists I’ve known reach for it when seeking a local anesthetic with manageable storage and handling demands—far less finicky than unstable esters or volatile oils. Stacking that reliability with its record of predictability in solution, it’s no wonder its use keeps growing.
Unlike many benzoate derivatives, tossing the methanesulfonic acid into the mix actually bumps up performance. The powder holds up well at room temp and doesn’t turn into a gluey mess in humid weather. Its solubility opens new doors, letting solutions go clear and stay stable during experiments; nobody needs a cloudy vial ruining results. Where older local anesthetics demanded careful pH adjustment or produced questionable reaction byproducts, this salt version gives more confidence at the bench. Those small details—melting point stability, ease of dissolution, reliable pH—make real differences during long days in the lab.
The preparation isn’t a secret recipe but takes careful attention. Usually, synthesis starts with ethyl 3-aminobenzoate, reacting with methanesulfonic acid under strictly controlled temperature to avoid overacidity or incomplete salt formation. Avoiding excess moisture or oxidation during production helps keep the final material pure. Some labs look for modifications—adding fluorine or tweaking side chains—to dial in properties like duration or strength. Organic chemists play with these variables, hunting for just the right tweak that could open a niche in sensory research or new diagnostic uses.
Trade and technical literature tosses around several synonyms—don’t get thrown off if you see “benzocaine methanesulfonate” or “ethyl 3-aminobenzoate mesylate”. The naming conventions can be confusing at first, but once you know this, you’ll spot it in research supply lists worldwide. This broad appeal—seen in both human and animal studies—shows how flexible the salt has become in lab work. Sometimes I talk with folks who started using one “brand” and discovered much later it was the same backbone molecule they’d trusted all along.
Just because something pops up frequently doesn’t mean it gets a pass on safety. Any lab using ethyl 3-aminobenzoate methanesulfonic acid salt sets policies for handling powders, especially when airborne dust could trigger allergies or, in rare cases, mild intoxication. Eye and skin protection, plus proper ventilation, are standards upheld by credible institutions. In academic settings, focus stays not only on acute toxicity but on cumulative exposure; nobody wants lingering health issues tied to years of casual handling. Regulatory bodies update labeling rules and operational standards as more data appears. There’s a push to keep Material Safety Data Sheets up to date and circulate them regularly among both new and veteran staff.
Most researchers have heard of this compound from neurobiology or pharmacology, but its reach extends well into marine biology, veterinary science, and beyond. In small animal anesthesia, it plays a big role: dosing can be controlled at finely tuned levels, minimizing side effects and reducing recovery time. In aquatic research, the water-soluble salt version lets researchers work without oiling up tanks or convoluting data with solvent artifacts. Some pathologists rely on it for tissue sample prep, reducing movement artifacts during fine dissection work. I’ve heard firsthand how switching to this salt allowed for cleaner imaging during nerve studies. Routine tasks, made easier and safer, mean bigger impact over years of research.
No discussion feels complete without wrestling with toxicity, especially as these compounds see more exposure beyond controlled environments. While acute exposure rarely triggers major side effects in research settings, chronic exposure still gets close attention. Some studies have shown tissue tolerance, but others raise flags about repeated or improper dosing in aquatic animals. Researchers continue digging into metabolic breakdown, comparing it to more established molecules like tricaine or lidocaine. We all want new data on tissue residues, elimination rates, or any long-term effect on organisms and researchers alike. At conferences and in journals, safety remains a front burner issue.
Moving forward, this molecule will likely see expanded investigation—especially as pressure mounts for research chemicals that meet higher safety bars while retaining cost and effectiveness. There’s a trend toward engineered analogs; some labs are screening new derivatives by adding electron-donating groups or by grafting similar sulfonic acid pairs onto comparable anesthetics. In the years ahead, tightening regulatory standards and a deeper look into green chemistry could push synthesis toward less wasteful routes. Academic and industrial partnerships may bring out protocols to recycle or neutralize spent solutions to keep environmental impact in check. Research and development teams are motivated as much by sustainability as by technical novelty these days. Continued collaboration across disciplines could shape safer, more precise generations of local anesthetics, given how central compounds like ethyl 3-aminobenzoate methanesulfonic acid salt have become to modern science.
Talking about chemical compounds often turns into a jargon-filled maze. Still, ethyl 3-aminobenzoate methanesulfonic acid salt deserves a closer look, not just from chemists but from anyone interested in science that touches health and animal welfare. This unique substance—often better known in veterinary medicine as MS-222—plays a critical role in how researchers and veterinarians approach animal handling and surgery. Over the years, I’ve seen this compound in action during both fieldwork and controlled research settings, making tough procedures possible while keeping animal trauma as low as possible.
In the world of animal research and aquaculture, handling fish or amphibians for medical checks or study can be stressful for both the animal and the handler. MS-222 steps in here as an anesthetic, especially valued for work with fish and other aquatic species. During a project to tag migratory salmon for tracking, our team relied on this compound to sedate the fish briefly. Without this step, the fish would thrash, risking injury or death from the stress alone. A conscious animal under stress not only undermines the accuracy of scientific findings but also raises big red flags about animal welfare.
Exposure to this anesthetic doesn't last long and it’s usually reversible by moving animals to clean water. Because of this quick recovery, MS-222 becomes a go-to choice for field biologists and vets. It enables procedures like taking blood samples or minor surgeries that were once unthinkable on delicate species. I remember seeing a simple gill biopsy performed without MS-222—nobody wants to go back there after seeing the benefits of humane anesthesia.
The use of MS-222 follows strict rules. Agencies like the U.S. Food and Drug Administration demand clean withdrawal times, ensuring no residue remains in fish consumed by people. That’s good science and public health rolled into one. In the early days, I remember the headaches sorting out all the legal forms and safety procedures to get approval to use MS-222. Over time, these checks have meant that any animal sedated for research or medical care returns to its environment with little risk to ecosystems or food supplies.
Some concerns do stick around. Fish can react differently to doses based on their species or the water temperature. I’ve seen researchers lose valuable time calibrating doses for new species. Mistakes with anesthesia are never just about ruined data—they can mean lost lives. That’s led to a demand for clearer dosing guidelines and faster dissemination of best practices. In my experience, email groups and open-access databases where professionals share details have been game changers. Accessible information keeps both fish and technicians out of harm’s way.
We also keep an eye on the environment. While MS-222 isn’t a high-volume pollutant, every chemical introduced to water deserves scrutiny. Disposal protocols for research tanks and holding areas now limit waste and prevent unintentional exposure to wild populations.
MS-222 has helped raise the bar for humane standards in animal care. It sounds like a specialty tool, but its impact on animal welfare and the quality of research is huge. From aquaculture experts to field biologists, people depend on this compound to make difficult procedures safer and less traumatic. Continued attention to training, regulations, and environmental management keeps this essential anesthetic working for animals, researchers, and the people who count on both.
Ethyl 3-aminobenzoate methanesulfonic acid salt pops up in labs, especially in zoology and fish biology. Researchers often know it as MS-222 or tricaine methanesulfonate. Aquatic biologists see it as an anesthetic for fish and amphibians, making it easier to study or transport them without stress or injury. Some hobby fishkeepers also use the product for humane euthanasia in aquariums.
Handling chemicals means digging into available data, and not just what’s printed on a label. The FDA approves MS-222 for some uses in fish, but it isn’t a simple green light across the board. The substance works by depressing the nervous system, so it slows down reflexes and ultimately knocks an animal unconscious. At the right dose, this offers a safe way to sedate fish. The FDA insists on a withdrawal period, ensuring any treated fish aren’t eaten too soon. This avoids drug residues winding up in the food supply. That same rule shows there’s a risk of accumulation in edible tissues if used the wrong way.
Applying this stuff outside expert settings makes me hesitate. It’s not meant for use with mammals, birds, or reptiles. Researchers know the dosage range for fish and amphibians, but there’s little information for other animals. Using an unapproved anesthetic on pets could lead to severe side effects or even death. Cases have shown respiratory collapse in aquatic species when the dosage isn’t carefully controlled.
Occupational exposure comes up as a concern. The Material Safety Data Sheet on tricaine warns users to avoid skin or eye contact, inhalation, or accidental ingestion. Working with it means gloves and goggles in most labs. Direct exposure risks include irritation and, with enough contact, effects on the central nervous system. No one recommends this stuff for direct use on humans. Doctors and vets never pick it for medical procedures involving people or pets. Sticking to approved anesthetics carries less risk. Anyone deciding to buy and use MS-222 at home for fish treatment should follow all instructions to the letter and use proper protective gear.
Plenty gets washed away in water changes or research waste. The salt dissolves well and probably breaks down in the environment, but dumping it in large amounts can still affect local waterways. It acts as a sedative on non-target organisms. This has cropped up in studies from Norway and the US, where improperly treated lab waste reached streams, causing strange fish behavior. It pays to follow disposal instructions and make sure it doesn’t accidentally harm wildlife.
Transparency in labeling matters. Fish breeders and labs do best with clear guidelines and tested procedures. Reading up on the withdrawal periods before stocking treated fish for sale or food protects people. Hobbyists gain peace of mind by sticking to the correct dose or working with a vet or specialist during tough situations. Avoiding cross-species experimentation with anesthetics feels like common sense. For amateur and professional handlers, talks with a vet or biologist are vital before bringing new chemicals into tanks or enclosures. Clinicians should keep reviewing published research and safety warnings, since proper dosage and careful application prevent nearly all issues researchers have encountered. Staying informed and cautious pays dividends long after the lid on the chemical bottle closes.
Ethyl 3-aminobenzoate methanesulfonic acid salt carries a long name, but its core makeup boils down to a familiar set of atoms tied together in ways that impact how it behaves. Its backbone reflects ethyl 3-aminobenzoate, known in some labs as ethyl m-aminobenzoate or benzocaine’s cousin. Add in methanesulfonic acid, and you get a salt form with improved stability and solubility, making it easier to handle and use in a range of environments.
The chemical formula for ethyl 3-aminobenzoate alone is C9H11NO2. Tying up the amine with methanesulfonic acid tacks on a CH4SO3 component, yielding a salt that solves specific chemical challenges. The complete formula sits at C9H11NO2·CH4SO3, and the structure combines the aromatic ring of the aminobenzoate with an ethyl ester, then binds that amine to the sulfonic acid. Each piece fits for a reason, not thrown together at random.
Molecular weight for a compound like this matters deeply in everyday use, as it guides measurement, dosing, and efficacy in the lab or clinic. By calculation: C9H11NO2 weighs in at roughly 165.19 g/mol, and CH4SO3 adds 96.11 g/mol. Total molecular weight lands at around 261.3 g/mol for the salt form, give or take rounding from supplier to supplier. Small as that difference may look, reliable numbers matter once you’re scaling up to kilo batches or dosing animals in trials.
Methanesulfonic acid improves water solubility and makes the amine non-volatile, easing challenges in storage and formulation. Researchers and chemists looking to dissolve the compound, crystallize it for purity, or move it across membranes see the impact firsthand. This salt form steers clear of some irritations and handling issues that free-base amines sometimes bring along.
Day to day, knowing the precise structure and mass isn’t just about answering trivia. Chemical engineers and pharmacists rely on these numbers for crafting protocols and catching errors. For instance, a mismatch in expected molecular weight often signals contamination or mislabeling, both potentially career-threatening mistakes in regulated environments.
The way methanesulfonic acid forms a salt with the aminobenzoate can shift the pharmacokinetics. Water solubility changes mean quicker absorption, steadier delivery, or, in some cases, fewer injection site problems if going down that route. As someone who has spent time with sensitive formulation development, these tweaks upstream mean fewer headaches downstream with stability, shelf-life, and patient compatibility.
Ethyl 3-aminobenzoate methanesulfonic acid salt lands in a middle ground—easy enough to make but with enough specialized uses that traceability and consistency become important. The right certificate of analysis and independent verification step up the reliability, which in turn backs up any claims on safety or performance. This foundation helps scientists, regulators, and even procurement teams trust what they’re getting. Without careful structure determination and molecular weight confirmation, mistakes can and have slipped through, risking wasted materials or even patient harm. Chemical suppliers and researchers both benefit from taking the time to check every number, every atom, and match up theory with the actual stuff coming off the delivery truck.
Open data about chemical structures and weights helps all parties move faster toward better science. Labs set up for rapid structural verification can catch problems before they snowball. Sharing raw data, real NMR spectra, and consistent documentation lets everyone spot patterns and avoid past pitfalls. Investment in robust databases, transparent sourcing, and cross-checking analytical results pays dividends, not just for compliance, but for real-world confidence. These habits push the whole field forward, bit by bit, making each molecule do its job with less risk and more trust.
Ethyl 3-Aminobenzoate Methanesulfonic Acid Salt isn’t something most folks run into at the grocery store. In my own chemistry training, we worked with lots of powders and salts that looked pretty innocent in the bottle. The real challenge didn’t come from using them, but from what they could do if they got too warm, too damp, or mixed up with incompatible materials. Even a simple-looking compound can break down, get clumpy, or even cause accidents if treated carelessly. Mishandling can mean ruined experiments or, worse, unsafe labs. Relying on solid, common-sense storage habits keeps people—students, researchers, or curious hobbyists—out of trouble.
One quick lesson: chemicals hate extremes. Rooms in many research buildings stay at a steady, cool temperature for good reason. Heat speeds up chemical changes that nobody wants. Ethyl 3-Aminobenzoate Methanesulfonic Acid Salt won’t just vanish, but leaving it near radiators, in sunlight, or inside a stuffy drawer makes it more likely to degrade. From bitter experience after returning to a sunbaked storeroom, I learned that even slight changes in appearance signal something’s off. Direct sun can even trigger a small bottle to sweat, turning dry powder into a sticky mess.
Humidity creeps in faster than people think. I’ve seen containers of chemicals clump up in less than a week in a humid basement. Ethyl 3-Aminobenzoate Methanesulfonic Acid Salt absorbs moisture from the air, turning fine powder into chunky crystals. Not only does that ruin accurate weighing, it can kick off unwanted chemical changes. Screw the cap on tight. A desiccator—one of those sealed containers with drying agents inside—always beats leaving bottles open on a bench. This extra step keeps the material exactly as it was meant to be, and avoids headaches during the next lab session.
Crowded, disorganized chemistry drawers never end well. I once saw a near disaster when a bottle of acid and a jar of a related salt wound up next to each other in a broken container. Segregating chemicals by type means less chance of unexpected reactions. Ethyl 3-Aminobenzoate Methanesulfonic Acid Salt likes peace and quiet—no mixing with acids, bases, or volatile solvents. Store it away from strong oxidizers or any chemical known for being “fussy.” The chemical stays good as new, and people working nearby stay a lot safer.
In one shared lab space, faded labels led to months of confusion and a couple of frustrated students. Every container should have a clear, permanent label with the compound name, concentration, and date received or opened. If I open a jar, I jot down the date—just a bit of tape and a Sharpie. That way, if the material sits around for years, everyone knows whether it's too old. I always check safety data sheets for quirks with each new chemical, too. Storing with care and understanding beats any corporate guideline. Good sense learned on the job is a lot harder to forget than most lists and worksheets.
Every time a chemical stays fresh and safe, someone in the lab made thoughtful choices ahead of time. Clean, climate-controlled shelves, tightly sealed bottles, a sensible layout, and the right labels don’t take much effort. It’s the mindset—treating every jar as something worth respect—that keeps things running smoothly in every science space I’ve called home.
In any lab, precise measurements aren’t just a matter of pride—they mean the difference between useful data and pure guesswork. Take Ethyl 3-Aminobenzoate Methanesulfonic Acid Salt. Most folks recognize it as MS-222's cousin, serving as a local anesthetic in fish and amphibian labs. People reach for this compound to keep subjects still and reduce their pain response, especially during brief surgeries or sample collection. Too little, and the model won’t calm down; too much, and things can spiral quickly.
The sweet spot for Ethyl 3-Aminobenzoate Methanesulfonic Acid Salt lands between 0.1% and 0.3% solutions in water. At this range, freshwater fish usually settle down within a few minutes, and there’s less risk of adverse effects. I’ve handled various strains of zebrafish with this method, and an immersion bath around 0.2% gets the job done without lingering recovery issues. That concentration mirrors recommendations from the American Veterinary Medical Association and echoes standards set by the IACUC.
Dosing rules shift if you’re working with amphibians or saltwater fish. Some species show higher tolerance, while others act oversensitive. Adjustments in the region of 100 to 300 milligrams per liter keep things on track for most small animals. That said, cold temperature slows things, and warm water speeds them up, so checking water temp matters more than most realize.
Stock from various suppliers doesn’t always perform the same, even with a proper barcode and purity numbers. Humidity during storage or a small batch exposer to air can change how quickly the animals respond. Every new container, I start by preparing the lowest suggested amount just to see how my test fish or frog acts. Increasing slowly means fewer surprises.
Even with published guidelines, there’s no replacement for close observation. Fish sometimes display signs of stress before true anesthesia kicks in: frantic swimming, surface gasping, loss of color. At that point, it’s time to recheck calculations and decide if you need to dial back on the salt. If animals recover sluggishly, that’s a big red flag.
Not every unit has a fresh solution made every morning. Stale mix loses punch. Some reports show that old solutions can become acidic, raising toxicity risk. Using ascorbic acid as a stabilizer helps, but even with that, I toss leftover solution by day’s end. Reliable results come from careful records: animal weight, solution volume, water chemistry, exposure time.
People sometimes forget glove and goggle rules because this compound looks tame. Skin exposure or inhalation can irritate mucous membranes quickly, and no one wants an allergic reaction ruining the day. After every session, ventilate the area, wash all containers, and dispose of spent solution in accordance with local rules.
If there’s a golden rule with Ethyl 3-Aminobenzoate Methanesulfonic Acid Salt, it’s this: measure well, document, and never assume yesterday’s results guarantee today’s. Reliable research and animal welfare improve when teams run their own pilot runs before diving into major protocols. That diligence keeps both your data and your conscience clear.
| Names | |
| Preferred IUPAC name | Ethyl 3-aminobenzoate methanesulfonate |
| Other names |
Benzocaine mesylate Ethyl 3-aminobenzoate methanesulfonate |
| Pronunciation | /ˈiːθɪl θriː əˈmiːn bəŋˈzoʊ.eɪt ˌmɛθ.eɪnˌsʌlˈfɒnɪk ˈæsɪd sɔːlt/ |
| Identifiers | |
| CAS Number | 49648-49-5 |
| 3D model (JSmol) | `C[C@H](OC1=CC(=CC=C1)N)S(=O)(=O)O` |
| Beilstein Reference | 2236820 |
| ChEBI | CHEBI:131346 |
| ChEMBL | CHEMBL4280182 |
| ChemSpider | 3317094 |
| DrugBank | DB09089 |
| ECHA InfoCard | 03b7e079-7981-41a2-8b02-e8c8cb44c38e |
| Gmelin Reference | 1090403 |
| KEGG | C14642 |
| MeSH | D001525 |
| PubChem CID | 15735338 |
| RTECS number | CY3675000 |
| UNII | W1F9V3D96T |
| UN number | UN3334 |
| Properties | |
| Chemical formula | C9H11NO2·CH4O3S |
| Molar mass | 259.30 g/mol |
| Appearance | White to off-white solid |
| Odor | Odorless |
| Density | 1.36 g/cm3 |
| Solubility in water | soluble in water |
| log P | -1.1 |
| Acidity (pKa) | 13.22 |
| Basicity (pKb) | 11.00 |
| Magnetic susceptibility (χ) | -47.5 × 10⁻⁶ cm³/mol |
| Refractive index (nD) | 1.557 |
| Dipole moment | 4.78 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 311.6 J·mol⁻¹·K⁻¹ |
| Pharmacology | |
| ATC code | N01BX04 |
| Hazards | |
| Main hazards | Harmful if swallowed, causes serious eye irritation |
| GHS labelling | GHS02, GHS07 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | H302: Harmful if swallowed. |
| Precautionary statements | P264, P280, P302+P352, P305+P351+P338, P337+P313 |
| NFPA 704 (fire diamond) | 1-1-0 |
| Flash point | Flash point: >230°F |
| Lethal dose or concentration | LD50 (oral, rat) > 2000 mg/kg |
| LD50 (median dose) | LD50 (median dose): Oral rat LD50 > 2000 mg/kg |
| PEL (Permissible) | PEL (Permissible Exposure Limit) for Ethyl 3-Aminobenzoate Methanesulfonic Acid Salt: Not established. |
| REL (Recommended) | 10 mg/m³ |
| Related compounds | |
| Related compounds |
Ethyl 3-Aminobenzoate 3-Aminobenzoic Acid Methanesulfonic Acid Methyl 3-Aminobenzoate Ethyl 4-Aminobenzoate Benzocaine (Ethyl 4-Aminobenzoate) Sodium 3-Aminobenzoate Ethyl 3-Nitrobenzoate |
