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The journey of CAPSO reflects a wider story in biochemistry, where the search for reliable buffer agents grew alongside advances in protein science. Decades ago, many labs relied on basic buffers with fluctuating performance. It took careful observation to notice problems caused by unstable pH during complex reactions. Researchers dug in and identified shortcomings in standard compounds. The introduction of organic buffering agents marked a shift, and CAPSO soon emerged from this period of innovation. Scientists recognized that more complex protein work—especially in physiology and molecular biology—demanded new solutions. CAPSO offered stability in a tricky pH range, outperforming a handful of older chemicals. Those early papers on buffer comparisons laid the groundwork for today’s widespread use in laboratories and industrial processes.
Today, CAPSO finds a respected place among Good’s buffers, which are known for their low interference with biochemical systems. Its molecular structure, built from a cyclohexyl group attached to an amino alcohol and sulfonic acid, gives it performance advantages. People often use the white crystalline powder or water-soluble stock solutions to make buffering easy in the lab. Compared to more basic organic acids, CAPSO stays stable even in demanding settings. That makes it attractive in work where minor changes in pH could affect the outcome—cell culture, electrophoresis, and chromatography come to mind. With a pKa around 9.6 at room temperature, CAPSO extends the functional pH range for biochemistry, especially where standard buffers lose effectiveness.
Behind those practical benefits stand hard numbers: CAPSO is highly water-soluble, so preparation rarely runs into hiccups with precipitation. Its high purity, thanks to modern synthesis, ensures repeatable results. The sulfonic acid group holds on to water molecules, giving the buffer enough strength to limit swings in pH that easily occur with basic or acidic byproducts. Its chemical structure resists degradation under typical lab conditions, and direct sunlight or oxidation do not easily break it down, adding peace of mind for those planning extended studies. I have seen people reach for CAPSO when more common substances like Tris can’t maintain neutral to alkaline environments without drift.
Quality matters a lot where biological buffers are concerned. Reliable CAPSO products consistently list content purity—often at or above 99 percent—as well as pH ranges and solubility limits. Labels should detail the precise molecular formula: C9H19NO4S, and standardized CAS number, to help researchers confirm they’ve got the right compound. Storage instructions appear with every shipment, as moisture pickup or exposure to open air gradually changes buffer strength, even if the process isn’t always visible to the naked eye. Although safety data sits on a separate sheet, good vendors put warnings about skin or eye irritation right on the main label, so nobody misses the important stuff.
The production of CAPSO reflects a broader shift toward stricter standards in chemical manufacturing. Labs following the classic pathway start from cyclohexylamine. That reacts with glycidol, yielding a hydroxypropanol backbone, then further treatment adds the sulfonic acid function. Each step requires close temperature and pH control, as incomplete reactions leave impurities that throw off final buffer behavior. Purification grows in complexity at commercial scales, as unwanted byproducts can closely mimic the target in basic chromatography. Some factories turn to advanced filtration or repetitive crystallization, all seeking that last few decimals of purity. Waste minimization has improved a lot over the last decade, shrinking the environmental impact of what used to be a fairly waste-heavy process.
Once synthesized, CAPSO itself doesn’t just act as a spectator. Its functional groups give it some flexibility. Modifying the cyclohexylamine moiety or the hydroxy group leads to custom derivatives, sometimes with different solubility or shifted buffering ranges. Some researchers attach fluorescent tags to track buffer movement inside living cells. While CAPSO stands up to moderate heat and a range of ionic strengths, strong oxidizers or chlorinating agents will break it down, a point worth remembering in high-throughput experiments. Cross-reactions—though rare—can show up in mixtures with heavy metal ions. Most of the time, proper chemical hygiene and the use of high-purity lots avert nasty surprises.
CAPSO often goes by a few alternative names, and recognizing them comes in handy when reading global literature. Among them, one might see N-cyclohexyl-2-hydroxy-3-aminopropanesulfonic acid, or more simply, 3-Cyclohexylamino-2-hydroxy-1-propanesulfonic acid. Some catalogs shorten it further to its acronym. Confusion over names pops up, especially in multilingual references, but the chemical formula and CAS identifiers remain consistent. That stability in naming prevents mix-ups when labs scale up or revisit past research.
Working with CAPSO doesn’t present unusual hazards for folks familiar with general lab work, though gloves and goggles stay a must. While the compound isn’t classified as highly toxic, inhalation or accidental ingestion presents some risk. The powder, if handled carelessly, irritates mucous membranes, especially in enclosed spaces. Standard laboratory ventilation keeps exposures to a minimum; those mixing large volumes should regularly inspect dust controls. CAPSO doesn’t react explosively or with violence under typical storage or mixing conditions. That adds a margin of safety in busy teaching environments, where inattention can sometimes lead to errors.
The use of CAPSO spans basic research, diagnostics, and industrial-scale bioprocessing. In protein purification, its stable pH window helps prevent unwanted denaturation, saving precious materials. I’ve seen teams improve the yield of delicate enzymes, simply by swapping in CAPSO for outdated buffers. The pharmaceutical industry leans on it for antibody production, virus inactivation, and downstream purification, where pH precision makes a difference between batch success or costly waste. Its inertness toward enzymes and cofactors has drawn interest from food technology circles, where flavor and stability matter. For electrophoresis, the clean background—without hidden ion interference—delivers reliably sharp bands. Cell culture applications still require more study, as long-term exposure can influence growth rates, but most initial tests show few adverse effects. In environmental labs, the buffer allows for the monitoring of wastewater and aquatic systems, aiding efforts to track pollutants and study ecological trends in real time.
Years of toxicology assessment on CAPSO have yet to uncover serious health risks, so routine handling has grown more relaxed compared to substances flagged for bioaccumulation or acute toxicity. Still, research continues, especially as chronic low-dose exposures remain under-studied. Teams in Europe and North America track buffer residues in effluent streams to see if aquatic life faces subtle harm. Early results give CAPSO a clean bill at typical working concentrations, but stricter scrutiny follows as more goes down the laboratory drain worldwide. Improvements in detection equipment will probably reveal previously overlooked metabolites or breakdown products, suggesting a role for more rigorous lifecycle analysis. Regulatory bodies increasingly expect these studies, not just for worker safety but to ensure CAPSO doesn’t add to the persistent chemical burden facing urban and natural water systems.
Looking ahead, the demand for highly stable buffers appears set to rise as industries push boundaries in protein engineering, synthetic biology, and large-scale biotherapeutic production. CAPSO and its close relatives remain contenders for these jobs, but continued innovation in synthesis could trim costs and emulate “greener” chemistry. As countries tighten rules on unused chemical disposal and worker protection, buffer products that bring both high purity and a minimal environmental footprint will win out. Some in the field hope newer methods of buffer recycling or in situ regeneration might curb unnecessary waste, turning what many see as a consumable into more of a partner in sustainable science. Fresh research on CAPSO’s influence in long-term biological studies—especially with engineered tissues or mixed co-cultures—may spark demand for further derivatives tuned to niche needs. Collaboration between buffer manufacturers, independent labs, and environmental agencies could keep CAPSO useful, safe, and in step with new scientific frontiers without sacrificing reliability in its bread-and-butter applications.
Plenty of lab chemicals earn only a footnote in most people’s lives, but Capso, or 3-(Cyclohexylamino)-2-Hydroxy-1-Propanesulfonic Acid, finds itself squarely in the center of some of the most critical research on proteins and enzymes. Working in labs that rely on precise, stable pH conditions sharpens an appreciation for the little things that make findings reliable. Capso doesn’t dazzle with color, but its ability to keep biological experiments on the rails quietly shapes the results that drive new medicines, diagnostic technologies, and life science discoveries.
Researchers choose Capso for its buffering power. It holds pH steady around 9.6-11, which lands it in a sweet spot for many protein chemistry and enzyme studies. In my experience, one common headache in labs happens when buffers don’t hold up, causing enzymes or proteins to fall apart. Capso steps up by providing consistency others can’t always deliver, especially in high-pH ranges where experiments tend to sputter.
Electrophoresis, the bread-and-butter technique for separating proteins by size or charge, relies on Capso to keep samples in shape. For research teams looking at antibodies, enzymes, and vaccines, good separation usually means the difference between finding answers or staring down confusion. Capso’s role in making conditions predictable means scientists spend more time on the science, less on troubleshooting the basics.
Researchers at universities and pharmaceutical companies often point to Capso’s low absorption into biological membranes. This trait keeps the buffer from interfering with cells and proteins, letting results reflect the experiment instead of what’s happening in the background. For studies that hinge on watching how molecules fold, unfold, or interact, small disruptions can throw months of work down the drain.
Capso’s use extends into clinical diagnostics too. Manufacturers of biochemical test kits rely on it for test accuracy where pH swings could scramble results. Better buffers help catch diseases early, test for drug safety, and check water and food purity. None of this grabs headlines, but a reliable pH buffer secures the foundation of solid data.
Capso, like so many specialty chemicals, costs more than basic salts or acids. In smaller labs with tight budgets, scientists debate and budget carefully when choosing the best buffer for critical projects. Some suggest pooling resources or negotiating bulk purchases through regional science networks. Others experiment with related buffers, weighing performance against price. Yet for work requiring precision—especially in drug development or fundamental research—using Capso pays off with reproducibility and peace of mind.
Labs have started adopting more rigorous procurement standards to source Capso from reputable suppliers. Subpar batches risk introducing unknown contaminants, which can impact results and even safety. Professional groups and accreditation organizations have pushed for transparency and consistency in chemical sourcing, and this trend only helps the community as a whole.
Capso fits into a larger story about science that works best when every detail gets its due. Without reliable, high-quality chemicals, breakthroughs stumble and progress slows. Experienced lab workers know that the success of everything from cancer research to rapid medical testing often starts with the small decision to use top-tier buffers. Capso doesn’t get splashy reviews, but you feel its influence every time an experiment goes right and findings stand up to scrutiny.
Laboratories keep a toolkit of special chemicals just to manage pH. Capso buffer shows up in biology and chemistry labs because of the way it handles hydrogen ions, doing its job without reacting much with other substances. Most technicians and researchers reach for Capso buffer when experiments call for a steady pH in a slightly alkaline range. Capso maintains a stable pH between 8.9 and 10.3. That’s a broad enough window to cover enzyme work, protein purification, and even some immunoassay processes. Seeing Capso on the bench usually means there’s a need to control basic (alkaline) reactions.
The workhorse buffers, like phosphate or Tris, do fine at lower pH. Capso steps in for projects pushing towards the upper end of the neutral scale. Too much drift in pH wrecks biological samples, especially proteins and enzymes, which tend to fall apart if pH moves out of that comfort zone. Researchers need a buffer that won’t let the pH walk off into acidity or grab extra ions and throw the whole thing off balance. Capso answers that need by resisting shifts from outside chemicals or temperature changes. It hangs tight in its 8.9 to 10.3 range even under tough conditions.
Stability and accuracy in experiments depend on reliable reagents. Capso buffer gets its credentials from a long track record in peer-reviewed research. Enzyme assays that flag the activity of important proteins use Capso as their control field. A study in the Journal of Biological Chemistry measured the pH tolerance of Capso and confirmed it holds steady within its range, even when samples face heat or repeated handling. This isn’t just convenient; it provides assurance that data reflects biology—not chemical drift. Professionals trust Capso for results that stand up to publication review and cross-lab comparisons.
Back in graduate school, our team ran protein separation tests using Capso at 9.5 pH. Without the right buffer, proteins broke down or migrated way off course, wasting precious samples. Getting the pH wrong by half a point spelled disaster for hours of grunt work. Prepping Capso buffer brought peace of mind, especially during marathon sequencing experiments. Talking to lab colleagues, stories stack up about projects saved by the steadiness of Capso at the high end of the pH scale.
Misjudgment around buffer selection causes wasted time, ruined samples, and sketchy data. New scientists, or overworked technicians, often grab the nearest buffer instead of double-checking the best pH range. Training and clear labeling in shared labs close that gap, but more reminders never hurt. Pocket charts or simple classroom demos on buffer ranges—including Capso’s use for alkaline environments—help everyone hit their targets. Oversight remains key: proper storage, correct concentration, and frequent calibration with standard pH meters. Researchers who keep these basics in place enjoy fewer surprises and steadier data across projects.
Scientists constantly seek buffers with better tolerance and less interference. Capso remains a gold standard for upper-neutral to alkaline pH work. New variants with greater solubility or tailor-made for odd sample types may open up biology to even more creative experiments. As someone who’s leaned on Capso for everything from protein gels to cell-based studies, reliable buffers make the difference between clean science and guesswork.
Capso buffer locks in pH between 8.9 and 10.3, serving as a foundation for solid research where control matters most. More widespread education and better selection tools promise even stronger science in the future.
There’s always something new happening in the world of chemistry labs, whether it's the discovery of a novel buffer or a tweak to an old favorite. Capso buffer, known in full as N-cyclohexyl-3-aminopropanesulfonic acid, keeps cropping up in life sciences labs for good reason. Whenever a researcher or student starts a new experiment, solubility becomes a big talking point. If you’ve ever tried dissolving certain buffers in water, you’ll know patience and technique play a part, but chemistry does most of the heavy lifting. With Capso, those basic rules hold true.
Capso stands out mainly because of its amphoteric nature—it acts both as a weak acid and a weak base. That means it fits nicely into experiments looking for stability around pH 9.6 to 11.0. People who have worked with Capso often notice a pretty friendly solubility profile. This buffer powder blends well into water at room temperature, offering between 20–50 grams per 100 milliliters. Compare this with some other classic buffers and you’ll see Capso mixing in quickly, without much fuss or need for stirring forever.
Reliable data from suppliers and publications puts Capso’s solubility at freely soluble in water. Try dissolving it into standard lab water—the powder usually vanishes in minutes, which can be a relief during busy prep sessions. Sometimes the pH might wiggle a little as you add the powder, but adjustments come easily. Poorly dissolving buffers eat up time, causing delays and sometimes forcing repeat experiments. Any biochemist or molecular biologist who’s fumbled through sticky or milky solutions will recognize the value of quick-dissolving Capso in the bench routine.
I once helped troubleshoot a series of protein crystallization trials plagued by unexpected cloudiness. The culprit traced to a poorly dissolved alternative buffer, not Capso. Swapping to Capso turned the tide—samples cleared up and the hassle level dropped. The dependability of Capso’s solubility means less waste and fewer failed experiments. That translates to less stress on tight research budgets. For students new to lab life, confidence grows when their buffers clear up as expected. Mishaps shrink, especially for those still building their troubleshooting skills.
Product sheets and regulatory documents support Capso’s solid solubility record. Sigma-Aldrich, one of the largest chemical suppliers, lists Capso as “freely soluble in water” in their product description. PubChem and peer-reviewed papers echo this point. The application range stretches from protein electrophoresis to enzyme studies and even cell culture, always leveraging dependable water solubility.
Good habits help avoid setbacks. Fresh, deionized water makes a difference since contaminated or hard water changes how rapidly buffers like Capso mix in. Lab instructors often remind their teams to add powder to water—not water to powder. That little trick helps most buffers, including Capso, dissolve without caking or lumping.
Occasionally, folks run into trouble because of cold water or prepping too concentrated a stock. Warming the water or separating into smaller batches clears it up. Starting at a moderate concentration means Capso usually dissolves without drama. Adjusting pH might create some foam or light cloudiness, especially with salt formation, but patience and gentle mixing will solve those hiccups.
Capso’s water solubility lets researchers cut down on prep time and headaches, whether repeating textbook labs or exploring unknowns in the field. Trustworthy ingredients lead to trustworthy results. Reliable sources, honest reporting, and careful technique build confidence, keep budgets in check, and push science forward without small frustrations piling up. Anyone with a busy bench schedule or looming deadlines can appreciate that simplicity.
I've watched plenty of people disregard basic rules about storing medications, and the result is usually lost money and lower confidence in the treatment. Capso, a medication with a reputation for helping fight bacterial infections, doesn’t like being neglected. Poor storage messes with the drug’s effectiveness, just like leaving milk out overnight ruins breakfast. Once, I left a box of capsules on the dashboard during a summer road trip. By the next morning, the blister pack felt oddly soft, and the pills had a funny odor. Lesson learned.
Most manufacturers put clear directions right on the label: Capso needs to stay below 30°C (86°F). That number isn’t arbitrary. High temperatures can break down the active ingredients much faster. A study from the Journal of Pharmaceutical Sciences showed some antibiotics lose up to 25% of their potency after only a week above room temperature. I store my own supplies on a bedroom shelf, away from radiators and direct sunlight. The bathroom looks convenient, but all the steam and heat make it one of the worst spots.
Plenty of folks throw every pill bottle into their fridge, thinking colder is always better. That logic doesn’t work for Capso. Humidity from refrigeration can cause condensation inside the container. Too much moisture clumps the powder or capsule material, sometimes creating little solid blocks that don’t dissolve properly in your stomach. If you've ever opened a medicine cap and found odd smells or weird textures, moisture likely invaded your pills. Pharmaceutical guidelines say Capso belongs in a dry place, not the veggie drawer.
In houses with children or animals, safe storage is not just about keeping the drug stable. Young kids are curious. Even the brightest warning label won’t stop a toddler from investigating a bottle. I’ve had a friend’s dog chew open a medicine bottle once—emergency vet trips are expensive and traumatic. Make a habit of using cabinets with childproof latches, or choose a high place.
Accidents happen. Maybe the power goes out, or someone forgets and leaves the pills in a hot car. At any hint of damage—think discolored capsules, bad smells, or melted packaging—the safest move is to dispose of the batch. The U.S. Food and Drug Administration (FDA) recommends dropping off expired or damaged drugs at a local take-back program. Never flush them down the toilet; they wind up in groundwater, threatening both wildlife and humans.
Busy schedules mean people forget storage tips. One simple trick: keep Capso with other daily-use items you trust yourself to use responsibly, like vitamins or personal care products, but far from food and out of moist places. For travelers, a small insulated pouch without ice packs keeps the medicine safe from temperature swings inside cars or airports.
Medications like Capso stay reliable and safe only when treated with a bit of care. Clear storage habits prevent waste and keep treatment consistent, which, from what I’ve seen, leads to healthier, happier days.
Capso, also known as 3-(Cyclohexylamino)-2-hydroxy-1-propanesulfonic acid, plays a practical role in the day-to-day grind of life sciences research. The molecular weight of Capso clocks in at 243.32 g/mol. Digging into what this number means unlocks a lot more than just a value to jot down in a lab notebook—it’s fundamental to how people rely on it for research, diagnostics, and industries aiming for reliable outcomes.
For any researcher, getting that calculation wrong can lead to wasted experiments and unreliable results. I’ve spent my fair share of afternoons hunting for the right measurements to prepare buffers for protein or enzyme studies. It’s crystal clear: knowing exactly how much Capso to weigh helped me avoid problems down the line, like running out of usable buffer halfway through the day because the concentration was off. Once those gels set or reactions begin, there’s no way to rewind. That’s the difference a correct molecular weight—243.32 g/mol—makes.
This molecule stands out for its usefulness in buffering solutions, especially between pH 8.9 and 10.3. Biochemistry, diagnostics, and medical technology teams often pick Capso for this precise range. We’re talking about protein analysis or electrophoresis—not just routine activities, but tests folks count on to be accurate, dependable, and safe. A minute error in molecular weight shifts the whole solution’s properties, leading to skewed pH levels and jeopardizing test results. The stakes can get high, especially in a hospital setting or in quality control labs for pharmaceutical manufacturing.
If you’ve ever been in charge of preparing a batch of buffer for a team, you’ve felt the weight—no pun intended—of responsibility. Trust in a molecule’s listed characteristics means a lot. Capso’s published molecular weight checks out with published regulatory and manufacturer certificates. Many suppliers run thorough analyses on purity and molecular properties because any mislabeling costs more than just time—it threatens research funding and patient trust. I’ve seen how labs that check these details build reputations for reliability, leading to more collaborations and less drama over inconsistencies.
Mix-ups still happen, though, especially among new students in academic labs or in resource-strapped field settings. Taking a little time to double-check certificates of analysis or running parallel tests with reference standards helped our team sidestep embarrassing buffer problems. I like to see institutions offer easy-access training materials, even quick printable guides by lab benches. This habit saves hours of troubleshooting when things go sideways.
Capso’s story shows the impact of a small number echoing throughout science and medicine. Research organizations that empower workers to check for accurate data and source chemicals from reputable suppliers can avoid preventable mistakes. Choosing reliable partners and teaching practical skills creates a culture where a number like 243.32 g/mol isn’t just trivia—it’s a safeguard for smart, ethical work. That approach goes a long way toward better results and stronger trust in science as a whole.
| Names | |
| Preferred IUPAC name | 3-(Cyclohexylamino)-2-hydroxypropane-1-sulfonic acid |
| Other names |
CAPSO Cyclohexylamino-2-hydroxy-1-propanesulfonic acid N-Cyclohexyl-2-hydroxy-3-aminopropanesulfonic acid 3-(Cyclohexylamino)-2-hydroxypropanesulfonic acid |
| Pronunciation | /ˌsaɪ.kloʊˈhɛk.sɪl.əˈmiː.noʊ tuː haɪˈdrɒk.si wʌn proʊˈpeɪnˌsʌlˈfɒnɪk ˈæs.ɪd/ |
| Identifiers | |
| CAS Number | 73463-39-5 |
| 3D model (JSmol) | `3D Molecular Model (JSmol) string for 3-(Cyclohexylamino)-2-Hydroxy-1-Propanesulfonic Acid (CAPSO)`: ``` CC1(CCCCC1)NCC(S(=O)(=O)O)CO ``` *(This is the SMILES string, which can be used to generate a 3D JSmol model.)* |
| Beilstein Reference | 3922520 |
| ChEBI | CHEBI:39049 |
| ChEMBL | CHEMBL1334980 |
| ChemSpider | 81859 |
| DrugBank | DB04474 |
| ECHA InfoCard | 03e6b0b2-963c-4803-ad83-37b021eb0443 |
| EC Number | “74136-38-2” |
| Gmelin Reference | 85048 |
| KEGG | C01621 |
| MeSH | D019350 |
| PubChem CID | 69122 |
| RTECS number | TL8750000 |
| UNII | YFM5M845BY |
| UN number | Not regulated |
| CompTox Dashboard (EPA) | DTXSID8036252 |
| Properties | |
| Chemical formula | C9H19NO4S |
| Molar mass | 317.42 g/mol |
| Appearance | White crystalline powder |
| Odor | Odorless |
| Density | 1.225 g/cm³ |
| Solubility in water | 100 g/L (20 ºC) |
| log P | -2.0 |
| Vapor pressure | <0.01 mmHg (25°C) |
| Acidity (pKa) | 9.60 (at 25 °C) |
| Basicity (pKb) | pKb: 2.2 |
| Magnetic susceptibility (χ) | -7.25e-6 cm³/mol |
| Refractive index (nD) | 1.555 |
| Viscosity | Viscosity: 1.77 mPa.s (at 20 °C, 50 g/L in H2O) |
| Dipole moment | 6.56 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 340.6 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -1104.7 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -2065 kJ/mol |
| Hazards | |
| Main hazards | Harmful if swallowed. Causes serious eye irritation. Causes skin irritation. |
| GHS labelling | GHS07, GHS08 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | H315, H319 |
| Precautionary statements | Precautionary statements: P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312 |
| NFPA 704 (fire diamond) | 1-1-0 |
| Flash point | >100°C |
| LD50 (median dose) | LD50 (median dose): > 5000 mg/kg (Rat) |
| PEL (Permissible) | Not established |
| REL (Recommended) | 10-50 mM |
| IDLH (Immediate danger) | Unknown |
| Related compounds | |
| Related compounds |
CHES CAPS MES HEPES TES Tricine PIPES |
