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Back in the late 20th century, calcium signaling research was making huge strides. Labs searching for molecules to tease apart how calcium ions move in and out of cells stumbled on 2-Aminoethyl Diphenylborinate. Chemists noticed its connection to boron chemistry and recognized its promise in biological experiments, especially after teams showed it could block certain calcium channels. Its commercial availability followed soon after, boosting the pace of work in several biology labs around the globe. Over the years, teams shared tweaks on synthesis and reported findings from experimentation, pushing understanding and widespread adoption. What started as a niche research tool transformed into a crucial component for examining cellular activity, especially in neurobiology and pharmacology.
2-Aminoethyl Diphenylborinate, usually sold under the acronym 2-APB, brings a boron atom together with an aminoethyl group and two phenyl rings. Labs gravitate toward it for its reputation as a versatile modulator, particularly in calcium ion channel studies. Researchers often speak highly of its practical value when trying to block or study store-operated calcium entry pathways in both mammalian and plant systems. For routine users, it offers a stable, easy-to-measure powder that stands up well over time if kept dry and away from light, making stock solutions reliable for multiple weeks if handled in airtight containers.
Pure 2-Aminoethyl Diphenylborinate usually shows up as a white to off-white crystalline powder. It melts at around 70°C and dissolves well in organic solvents like DMSO or ethanol, though it resists dissolving in water. Its molecular formula, C14H16BNO, translates to a compact structure, which brings both the hydrophobic bulk of the phenyl groups and the hydrophilic end from the aminoethyl part. Boron, not often seen in standard biochemistry reagents, gives the molecule a unique reactivity profile, allowing selective interactions with certain biological targets. It smells faintly sweet or aromatic, a reminder of its phenyl content, and its spectral fingerprint in NMR confirms structural purity for those who check batch-to-batch consistency.
Bottles of 2-Aminoethyl Diphenylborinate arrive marked with lot numbers, purity details—usually above 98%—and clear storage instructions. Most suppliers label it for research use only, not for dosing in humans or animals. The typical pack sizes range from 100 mg to several grams, and certificates of analysis show HPLC chromatograms and melting point validation. Researchers can expect to see both its CAS number, 524-95-8, and systematic names like 2-(Diphenylboranyl)ethanamine on the label, which help tie back results to published standards. Labs logging chemical inventories find the labeling straightforward, which helps during audits and procurement reviews.
Chemists synthesize 2-Aminoethyl Diphenylborinate by reacting diphenylborinic acid with aminoethanol or its hydrochloride salt in basic conditions. The process often starts under a nitrogen atmosphere to keep moisture out, since boron compounds tend to form byproducts if exposed to air. Separating the pure product usually involves evaporation and recrystallization from an organic solvent. Each batch demands careful attention to reagents and temperature because boron-oxygen bonds will hydrolyze if handled roughly. Labs with modest glassware and a vigilant eye can prepare multi-gram quantities, but scaling up requires some finesse and practice, especially to avoid polymeric or insoluble byproducts. Purity checks, usually done using NMR, IR, and melting point, protect against mixing up side-products or contaminants that undermine downstream experiments.
At its heart, 2-Aminoethyl Diphenylborinate acts as both a Lewis acid and a nucleophile, thanks to its boron atom and amino group. Synthetic chemists sometimes use it as a building block, reacting the boron center with oxygen- or sulfur-rich molecules to make new boron-organic hybrids for sensor or drug design. Mild acid hydrolysis breaks it down, and oxidation at the phenyl rings opens routes to functionalized derivatives. Adding or swapping out the aminoethyl side tail unlocks relatives with slightly different solubility or cell membrane permeability. Its reactions in biological media—especially changes under low or high pH—help researchers shape conditions to generate more selective channel blockers or dissect different calcium signaling routes in cell models.
2-Aminoethyl Diphenylborinate pops up in catalogs as 2-APB, reflecting its full chemical name. Journals sometimes refer to it as DPBA-amine or Diphenylboronic Acid Aminoethyl Ester. In plant physiology circles, researchers call it a boron-based calcium channel modulator, while neurobiology teams stick with “2-APB.” Trade suppliers often use all the variants in their catalogs to help scientists cross-reference with their protocols or previous experiments. The story behind these different names often traces back to varying synthesis routes or early suppliers branding the product under their own research labels. For procurement and documentation, recording synonym and CAS number helps streamline inventory.
Safe handling demands gloves, eye protection, and a fume hood because 2-Aminoethyl Diphenylborinate absorbs through skin and may irritate mucous membranes. Users shouldn’t taste or inhale its dust, and accidental contact calls for thorough rinsing with water. Waste disposal follows standard protocols for organic, boron-containing chemicals—collected in clearly labeled containers and processed by certified waste services. Most suppliers issue Safety Data Sheets noting its irritant properties, environmental risks, and accident response steps. Training for new lab personnel should include how to clean spills, handle contaminated glassware, and interpret hazard symbols. Regular audits of storage cabinets ensure bottles don’t degrade and pose risk, especially since moisture wrecks boron-based powders over time. Permanent records of handling and incident reports support lab-wide compliance with both internal and regulatory standards.
Researchers often rely on 2-Aminoethyl Diphenylborinate to dissect calcium signaling in platelets, neurons, and various plant tissues. It shines in pharmacological experiments aimed at teasing out the contributions of transient receptor potential (TRP) channels or intracellular stores relating to IP3 receptors. Its impact stretches across disciplines—helping immunologists, plant biologists, and neurophysiologists map out ion currents, signal cascades, and drug responses. Cell biologists mix it in culture media for acute treatments or inject it into animal models to watch rapid shifts in cell behavior, especially in calcium-dependent processes like muscle contraction or neurotransmitter release. In plant research, workers use 2-APB to modulate growth and stress responses by targeting plant-specific calcium signaling proteins, often linking results to drought or disease resistance studies.
Since its adoption, R&D teams experimented with many relatives of 2-Aminoethyl Diphenylborinate, tuning the chemical structure to discover molecules with greater selectivity or longer stability in physiological buffers. In medicinal chemistry, work focuses on analogs that target distinct TRP channel subfamilies, aiming to separate therapeutic benefits from off-target effects. Molecular modeling now supports design cycles, offering predictions on channel binding and guidance for synthesis. Contract research organizations and academic pharma collaborations test new derivatives in animal models, searching for signals tied to pain management, immune modulation, or cancer cell suppression. These explorations continue to deepen insight, and publication rates keep climbing as labs report successes—plus a fair share of cautionary tales—about specificity or unexpected toxicity profiles compared to classic 2-APB.
Initial reports showed moderate acute toxicity in lab animals exposed to high doses, with effects ranging from mild irritancy to more severe systemic disturbances at large concentrations. Long-term studies remain sparse, but cell culture work spotlights how 2-Aminoethyl Diphenylborinate may damage membrane integrity and disrupt normal mitochondrial functions, particularly with repeated or prolonged dosing. Environmental assessments hint at moderate persistence in aquatic settings, with degradation following slow hydrolysis. Chronic exposure data in humans is limited, so researchers handle it with caution. Calls for expanded safety studies echo through R&D groups, given the molecule’s popularity and its diffusion into ever-wider research circles. Responsible use and documentation of hazards form an important layer in both discovery and commercial supply."
Looking ahead, there’s a solid push to refine boron-based channel blockers with better fit for clinical settings and agricultural applications. Teams hope to swap out the base structure to minimize toxicity while amplifying specificity for chosen ion channels, using AI-driven screening and high-throughput chemistry. In agriculture, early work pairing 2-Aminoethyl Diphenylborinate’s mode of action with crop protection signals the rise of new plant growth regulators tailored to improve food production under stress. Advancements in drug design may soon rely on lessons learned from tuning its boron backbone, especially to build new types of cancer therapies or neuroprotective agents. Collaboration among chemists, pharmacologists, and manufacturers shapes a research environment where discoveries translate into practical, safer products for labs and, possibly one day, for broader public use.
Step into any lab that studies how cells talk to each other, and 2-aminoethyl diphenylborinate (often called 2-APB) will likely show up on a shelf. This chemical wasn't made to be medicine or some household product you'd find at the store. Instead, it’s a tool researchers use to understand the tiny details of how cells work. One striking thing about it: this compound blocks specific channels and receptors that let calcium ions move in and out of cells. Calcium signals keep our heart beating, help nerves fire, and play a huge part in how muscles contract.
The reason 2-APB gets called for duty often comes down to its ability to toss a wrench into complicated processes. It helps slow down or even stop these calcium channels. In my own grad school days, I watched colleagues treat petri dishes of heart cells or neurons with this compound. We could see in real-time how cells changed their behavior, almost like turning down the volume on a noisy room. Results were clear enough to convince you: block calcium signals, and all sorts of things slow or shut down.
Take diseases like heart arrhythmia, asthma, or brain disorders. All of them tie back—at least partly—to problems with how calcium ions move. 2-APB gives researchers a way to test new ideas about what goes wrong and what might fix it. People often ask why they can’t just use other blockers—truth is, most alternatives either aren’t as reliable or end up causing unwanted side effects, especially in delicate lab models.
Health care hasn’t reached the point of using 2-APB as a therapy, and it’s important that people don’t treat it like medicine. Still, the knowledge built thanks to this chemical sits at the foundation of new drugs or treatments for diseases where calcium plays a role. For example, I remember reading a study on pancreatic beta cells—these are the guys in the pancreas that make insulin. 2-APB helped researchers figure out what got in the way of insulin being released, offering new angles for diabetes treatments. Similar progress happens across neurobiology, cardiology, and even cancer studies.
What matters: it all boils down to giving researchers a kind of spotlight for watching what happens when you block calcium from one door but not another. This targeted approach reveals hidden aspects of disease and gives drug developers the blueprints for something safer or more precise.
Science has never claimed 2-APB is perfect. The chemical sometimes blocks other kinds of channels, which clouds the picture when results come in. As a scientist, you start to wonder what’s actually happening and what’s just side noise. Labs keep hunting for improved compounds, with fewer surprising side effects, that do the same job. If anything, all the work done with 2-APB has shown how much tougher it is to design laboratory chemicals that target only what you want with zero spillover.
The goal, in the end, is simple: let’s find molecules that give us a sharper lens into life at the smallest levels, without smudges or distractions. Until then, 2-APB keeps its job as a workhorse tool, opening more questions each time it answers one. It’s a reminder that curiosity, along with solid tools, keeps the engine of science running.
2-Aminoethyl diphenylborinate can sound like a mouthful, but the structure holds a story about how chemists build molecules to solve real problems. Also known as 2-APB, this compound contains a boron atom bonded to two phenyl rings and an ethyl group holding an amino group. Picture boron as the centerpiece, linking up with two aromatic benzene rings (that’s the “diphenyl” part) while also tagging onto an aminoethyl arm. Swapping out more common atoms for boron gives the molecule its own personality and reactivity. Its structure looks like this: C14H16BNO. The two benzene rings keep the molecule relatively rigid, and the aminoethyl tail builds in a layer of chemical versatility chemists love to leverage in the lab.
There’s no need for a microscope to see how this fits together—just some chemistry background and maybe a sketchpad. The boron atom stays at the center, acting as the hub. Each of the two phenyl groups attacks from the side, giving the boron stability and bulk. The aminoethyl attachment gives the boron a partner to interact with other biological targets, making it stand out compared to simpler boron compounds. Anyone who has ever studied organic chemistry can feel the logic in the arrangement: aromatic stability, boron’s unique electron structure, and an amine’s flexibility.
Molecular structure teaches chemists about a compound’s possible uses and hazards. 2-APB’s configuration lets it act on proteins that control calcium entry into cells. Researchers use it in the lab to block and investigate certain kinds of calcium channels. These proteins matter for everything from muscle contraction to memory formation. If you tinker with these pathways, research opens up on how the brain works or how to better manage diseases linked to abnormal calcium flow, such as arrhythmias or some neurodegenerative disorders.
Reliable evidence from peer-reviewed studies continues to show how well-defined structure–activity relationships guide pharmacology. Scientists have used 2-APB’s distinct shape to probe how cells communicate with each other and to identify routes that might go wrong in disease. Without a clear picture of the structure, these breakthroughs stall or take far longer to achieve. All great experimental progress begins with trust: trust in published results, chemical purity, and knowledge of what these molecular shapes actually look like on a whiteboard or in computer models.
The diphenylborinate backbone isn’t just for show. Rigorous adherence to lab safety guidelines is a must since boron-containing compounds sometimes present toxicity risks at higher concentrations. Institutions publishing work on 2-APB regularly highlight these points to support reproducibility and protect lab workers as well as study participants. Long experience running lab projects has taught me to always double-check chemical labels, scrutinize published structural data, and stay alert to how even subtle changes in a molecule’s arrangement can make major differences in risk or reward.
Decoding the skeleton of molecules like 2-aminoethyl diphenylborinate shows how science works at its roots—and helps point researchers and clinicians toward choices that matter. Open data, peer-reviewed structures, and ethical sharing get everyone closer to smart, safe, and effective use of the compound both in testing and, eventually, in practice.
Ask any chemist about 2-Aminoethyl Diphenylborinate and you’ll get a serious face. People use this compound, often called 2-APB, for applications in scientific research, especially for studying calcium signaling in cells. The stuff tends to break down if it sits out in the open air or heat. Moisture and sunlight don’t do it any favors either. I watched a postdoc lose a batch after storing the bottle on a sunny bench for just a week. It's frustrating and expensive, so the lesson lands hard: pay attention to the label and never just leave it out.
Manufacturers always note the temperature range. Most recommend keeping 2-APB in a tightly closed container, somewhere dry and cool. But labels leave out the story of what happens if that corner gets direct sunlight, or some eager intern sets the bottle on a windowsill. One careless move, and the white powder turns sticky or clumped. I've seen mistakes in shared university labs, where someone insisted a “cool, dry place” meant the top of a fridge, right below the heat vent.
Sticking 2-APB in a dedicated chemical fridge—away from food, out of reach of accidental spills—saves money and work. Chemical refrigerators in my old lab came with a small, sealed box just for moisture-sensitive compounds. Tossing a silica gel pouch inside worked wonders; replacing those every few months meant bottles stayed bone dry. Fresh powder maintains its look and usability far longer than samples left in humid spaces.
Clear labeling helps fight forgetfulness. Too many stories start with finding a mystery bottle in the back of a cupboard—no date, no initials, just faded scribbles. Simple habits go a long way: date the container, note the storage temperature, jot a warning about moisture. Leaving your initials ensures no one points fingers later if something goes wrong. Any doubts about a bottle’s age or integrity should lead to safe disposal, not risky experiments.
Conversations in research groups often gloss over this kind of routine discipline. It feels boring to review storage basics, yet labs running smoothly show the fingerprints of people who care about the details. Regular peer checks help. I learned to ask a coworker about their storage habits before trusting their shared reagents. No amount of published data beats trust built from seeing clean, orderly shelves and people who take the time to do things right.
Accidents don’t announce themselves, so preparation offers the only real protection. Secondary containment trays catch spills. Written procedures stay posted on cupboards and fridges. Keeping 2-APB physically separated from acids and bases cuts the risk of dangerous reactions. Training new students—hands-on, right at the storage site—makes the rules feel real, not just words in a binder.
Safe storage of 2-Aminoethyl Diphenylborinate takes more than just avoiding sunlight and high temperatures. Simple, practical steps—dry space, tough labeling, a focus on visibility—keep people safe and experiments fruitful. I've learned that good habits in chemical storage save more than just the compound—they keep trust and momentum alive through every project.
2-Aminoethyl diphenylborinate, usually found in research labs, acts as a common chemical tool in studies on calcium channels and cell signaling. In the world of biomedical research, the abbreviation “2-APB” pops up all the time in published studies. Many researchers, especially those early in their careers, know it well as a quick way to block or activate specific biological processes in cell cultures or tissues.
Chemical safety slips into the background when people become comfortable working with substances like 2-APB. Harvard’s safety department describes this compound as “harmful if swallowed, inhaled, or absorbed through the skin.” Dry powder can form dust, which gets into the lungs or settles on the skin; concentrated solutions sting the skin and eyes. I’ve watched colleagues at the bench treat this compound with more caution than others because the safety data sheets clearly warn about toxicity.
Acute exposure stories are rare because it gets handled in small quantities, usually dissolved in solvents and applied to lab samples. That low-use profile doesn’t mean the compound is harmless, though. Routes of exposure include accidental spills, splash-back during pipetting, and inhalation during weighing. Toxicology reports describe the risk of respiratory irritation, headaches, and stomach trouble upon exposure. Animal studies show that ingestion causes moderate toxicity, but there’s little human-specific data since it is mostly a research chemical.
Most researchers don’t think much about what happens to chemicals like 2-APB after disposal. It goes down the drain in most labs, following local hazardous waste protocols. Over time, persistent exposure to boron-based compounds in lab animals has been linked to reproductive and developmental harm. Regulatory bodies, such as the European Chemicals Agency, flag diphenylborinate derivatives as substances of concern based on animal and environmental data.
Sustained skin contact or repeated inhalation does not cause cancer, based on current research, but there’s still a gap in knowledge about chronic low-level exposure. Reproductive toxicity in boron compounds raises a question about precautions for pregnant researchers or those planning a family. Small spills, once overlooked, now trigger double gloves, splash goggles, and designated waste bins in many well-run labs.
The push for safer lab environments goes beyond just following the printed safety sheet. Experienced scientists now train undergrads and visiting researchers to respect even ‘everyday’ chemicals like 2-APB. Simple steps—using a fume hood, wearing nitrile gloves, and keeping containers closed—offer real peace of mind. Universities offer annual refreshers on chemical hygiene, drilling home the importance of never underestimating research chemicals based on routine use.
Even as science rushes forward, safety keeps pace out of necessity. Better chemical substitutes come on the market, and some labs already switched out 2-APB for newer blockers with clearer safety records. Transparency in reporting near-misses or spills helps, along with pressure from funding agencies to enforce safety standards. Regulators and scientists both shape these choices, balancing new research with personal and public health.
Nobody wants unreliable data. In biological assays, picking an effective yet not-too-toxic concentration can separate solid findings from a lot of wasted effort. In my early lab days, the temptation to just double the literature concentration “to be sure” often backfired, causing unexplained cell death. The story holds for 2-Aminoethyl diphenylborinate (2-APB), popular as a calcium signaling modulator. This molecule blocks several calcium-permeable channels, with effects that change depending on the dose.
Labs stick close to the published range: 10 to 100 micromolar. At 10 μM, 2-APB gently tweaks IP3 receptors and store-operated calcium channels. Some groups report that higher doses, say 50 to 100 μM, slam the door on most calcium entry but can also spark off-target actions. At the same time, many mammalian cells start suffering from more than just channel blocking—the higher up you go, the more likely you’ll see odd responses or cell death.
In multi-well plate experiments with HEK293 cells, sticking to 20 μM produced clear, interpretable traces on the calcium imaging rig. Jacking it up to 100 μM made the baseline noisy, and in some wells the cells rounded up or detached. If you’re running a new cell line or primary cells, a titration curve always uncovers a sweet spot.
The wild card with 2-APB: it does a fair bit more than just block one target. It impacts both inositol 1,4,5-trisphosphate (IP3) receptors and store-operated calcium entry channels, sometimes even enhancing some TRP channels at doses above 50 μM. That means results from one system won’t always match another. If you want to block store-operated calcium entry without much fuss, 20 to 30 μM often works fine for Jurkat or HeLa cells. For keratinocytes, aiming for the lower end avoids strange effects on differentiation.
The big review by Bootman and colleagues (2013) called out that 2-APB concentrations above 50 μM can give paradoxical activation or block depending on the channel subtype. This can scramble conclusions if you expect clean antagonism, so reading up on what has worked for your model is essential.
Nobody fully trusts a protocol copied straight from another organism or cell type without their own pre-test. Adding a concentration-response experiment to the start of any new assay readies you for troubleshooting and prevents the hours lost in chasing weird outlier results. For me, running a quick viability assay alongside the main readout helps spot doses that blow up the assay from the get-go.
2-APB often comes dissolved in DMSO, so matching the vehicle control is a must. Any biological change should stand above the DMSO background. Skipping this step led one of my projects astray more than once, making it look like “drug effects” were just solvent toxicity.
Aiming for 10 to 50 μM gives a good starting range for most cell-based experiments. The lower end tends to work for gentle interventions, higher only necessary if you have hard-to-block channels or want a knockout effect—always keeping in mind the risk for side activities. Sticking to the mid-range and letting your cells guide you beats any one-size-fits-all approach.
| Names | |
| Preferred IUPAC name | N-Phenyl-N-(2-phenylboranato)ethanamine |
| Other names |
2-APB 2-Aminoethoxydiphenyl borate 2-Aminoethyldiphenyl borinate 2-Aminoethoxydiphenylborane DPBA |
| Pronunciation | /tuː əˈmiːnoʊˌɛθɪl daɪˈfɛnɪl bɔːˈrɪneɪt/ |
| Identifiers | |
| CAS Number | '53560-66-6' |
| Beilstein Reference | 1598736 |
| ChEBI | CHEBI:88855 |
| ChEMBL | CHEMBL146617 |
| ChemSpider | 50437 |
| DrugBank | DB03604 |
| ECHA InfoCard | echa.europa.eu/substance-information/-/substanceinfo/100.108.800 |
| EC Number | 202-877-1 |
| Gmelin Reference | 1841459 |
| KEGG | C11668 |
| MeSH | D000900 |
| PubChem CID | 160843 |
| RTECS number | ED3710000 |
| UNII | N9K3C8R6Z1 |
| UN number | UN2811 |
| CompTox Dashboard (EPA) | DTXSID4039170 |
| Properties | |
| Chemical formula | C14H16BNO2 |
| Molar mass | 261.12 g/mol |
| Appearance | White to off-white crystalline powder |
| Odor | Odorless |
| Density | 1.099 g/mL |
| Solubility in water | Insoluble |
| log P | 2.95 |
| Acidity (pKa) | 8.8 |
| Basicity (pKb) | 3.18 |
| Magnetic susceptibility (χ) | -71.0e-6 cm³/mol |
| Refractive index (nD) | 1.144 |
| Viscosity | Viscous liquid |
| Dipole moment | 4.21 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 493.7 J·mol⁻¹·K⁻¹ |
| Std enthalpy of combustion (ΔcH⦵298) | No reliable standard enthalpy of combustion (ΔcH⦵298) data found for 2-Aminoethyl Diphenylborinate. |
| Hazards | |
| Main hazards | Harmful if swallowed. Causes skin and eye irritation. May cause respiratory irritation. |
| GHS labelling | GHS07, GHS05 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | Hazard statements: "H302: Harmful if swallowed. H315: Causes skin irritation. H319: Causes serious eye irritation. |
| Precautionary statements | P264, P270, P301+P312, P330, P501 |
| NFPA 704 (fire diamond) | 1-2-0 |
| Flash point | 159.1 °C |
| Lethal dose or concentration | LD₅₀ (oral, rat): > 2000 mg/kg |
| LD50 (median dose) | LD50 (median dose): Oral, Rat: 250 mg/kg |
| PEL (Permissible) | Not established |
| REL (Recommended) | REL (Recommended): Not established |
| IDLH (Immediate danger) | Not listed |
| Related compounds | |
| Related compounds |
Diphenylborinic acid Triphenylborane Phenylboronic acid 4-Aminophenylboronic acid Boronic acid 2-Aminoethanol |
