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Not everything in the modern lab has a story full of radical breakthroughs, but KOLLIPHOR HS 15 speaks to decades of real, on-the-ground innovation. This polyoxyethylene variant, developed as a nonionic surfactant, first turned up in the mid-20th century as the pharmaceutical world searched for better ways to dissolve stubborn drugs and oils. In those days, few solutions tackled the headaches posed by hard-to-solubilize compounds or handled the balancing act of mixing water and oil effortlessly. Pharmaceutical chemists needed something practical, not just elegant on paper, and KOLLIPHOR HS 15 slowly earned its slot as a workhorse in both research benches and full-scale manufacturing lines, becoming almost a rite of passage for those learning how to make things mix when they'd rather not.
This surfactant stands out for its lively ability to shift between different environments without losing structure. Anyone who’s spent time compounding oral or topical formulations knows the frustration when an active ingredient refuses to dissolve. With KOLLIPHOR HS 15, that friction softens—a result of its unique balance between hydrophilic (water-loving) and lipophilic (oil-oriented) groups. Formulators lean on it for producing microemulsions and improving the solubility of hydrophobic drugs, a role that rings especially important for increasing the oral bioavailability of tough actives. It’s backed by a strong record in injectable solutions, creams, and the ever-challenging field of biologics, where protein stability and solubility can make or break a formulation.
Talking properties, KOLLIPHOR HS 15 doesn’t play coy. Its chemical backbone consists of polyethylene glycol mono- and diesters of 12-hydroxystearic acid, typically with a polyethylene glycol (PEG) chain about 15 units long. This molecular shape lends it a creamy-white, waxy look at room temperature, though things turn fluid as heat climbs. Water solubility marks a standout feature—unlike many other surfactants, it dissolves easily in both cold and hot water, and it can emulsify not just oils but also a suite of other solvents. Its critical micelle concentration sits comfortably low, which means reliable performance even at modest dosages. The nonionic nature keeps it from interfering with charged molecules, improving compatibility across a variety of actives, preservatives, and excipients.
Rules around labeling and specifications are far from arbitrary in the pharmaceutical sphere, and KOLLIPHOR HS 15 serves as a clear example. Depending on region and end use, pharmacopeias such as the European or United States editions anchor purity standards, listing specifics about PEG content, acid value, saponification number, and heavy metals. These numbers mean more than chemistry trivia—they represent trust between manufacturer and end-user, assuring that the next batch won’t throw an unexpected curveball into a validated drug product. Accurate labeling of all significant excipients in medicines helps avoid allergic surprises or unanticipated reactions, benefiting prescribers and patients alike.
The story of KOLLIPHOR HS 15's preparation involves more than just mixing chemicals and heating things up. Producers begin with 12-hydroxystearic acid, a fatty acid derived from naturally occurring stearic acid, before running it through ethoxylation—allowing ethylene oxide to react with the acid, stringing together PEG side chains in a controlled process. Skilled technicians keep a close grip on reaction temperature, pressure, and feed rates to avoid random, non-uniform molecules that could throw off performance in tight-tolerance applications. Purification steps remove unreacted acids, chance byproducts, and excess PEG, ensuring that what leaves the reactor earns its shelf space in a GMP-compliant facility.
Through the years, chemists have nudged the structure of KOLLIPHOR HS 15, aiming to improve its stability or tailor it for a specific purpose. Adjusting the length of PEG chains, swapping in different starting fatty acids, or even blending with other surfactants nuances the function, letting the end product flexibly match different dosage forms. For those taking formulation seriously, these variations can spell the difference between a winning product and a mediocre one, helping deal with precipitation, clarity, or interaction challenges—especially with the growing roster of insoluble new chemical entities looking for a way into mainstream medicine.
Across different markets and literature, names create as much confusion as clarity. KOLLIPHOR HS 15 appears under a patchwork of synonyms: Polyoxyl 15 Hydroxystearate, PEG-15 Hydrogenated Castor Oil, and sometimes older trade monikers. Research articles, regulatory applications, and even product inserts sometimes jumble these names. This muddled identity underscores why regulatory bodies set clear rules for ingredient listing, ensuring no one unwittingly swaps active agents or doubles up due to mislabeling.
Anyone who’s spent time in pharmaceutical or chemical manufacturing knows hazards lurk not just with potent drugs, but with basic excipients, too. KOLLIPHOR HS 15 rates as low hazard under most handling scenarios, but operators still respect it. Safety data sheets zero in on potential eye or skin irritation and explain why strong ventilation counts during bulk handling. To protect both product and worker, companies adhere tightly to established guidelines: keep it out of eyes, avoid deliberate inhalation of concentrated vapors, and lean on personal protective equipment. Modern plants deploy monitoring, automation, and specialized training, reducing the odds of exposure while keeping quality untouched.
Real-world application draws the line between theory and value. In drug delivery, KOLLIPHOR HS 15 gets credit for driving new drugs past the solubility roadblock, especially with poorly water-soluble molecules. It enables rapid dispersion in oral liquids, holds oily injectables in tight, clear solution, and brings consistency to topical creams and lotions. In the lab, it’s a problem-solver for formulation scientists managing unpredictable raw materials, while in the patient setting its biocompatibility and low irritation potential bring relief for sensitive populations. Its reach extends into more specialized fields too: as a vehicle for diagnostic agents, as an emulsifier in veterinary medicines, and as a stabilizer in flavor emulsions for food.
Research never really stands still, and KOLLIPHOR HS 15 serves as both a benchmark and a stepping stone. Developers turn to it for reliable performance during preclinical screens, especially as advanced drugs (biologics, macromolecules) flood the pipeline and need tailored solutions for their unique quirks. Recent literature highlights creative uses: from nanotechnology vehicles ferrying anti-cancer agents, to oral films, to transdermal patches. Formulation teams often explore KOLLIPHOR mixes in search of ideal release rates, better taste masking, or longer shelf life. These experiments push product boundaries and spawn fresh options for patient care.
Years of laboratory and clinical experience build a strong record for KOLLIPHOR HS 15, with most evidence agreeing on limited toxicity in approved uses. Studies suggest rapid elimination after oral intake and rarely flag accumulation in tissues. Some cases of mild hypersensitivity pop up in injectable settings, leading regulatory groups to recommend careful dosing and, where safe, pre-screening of susceptible patients. Detailed animal work paints a reassuring picture, with high oral doses needed to trigger adverse effects. As always, excipient safety depends on clear-headed risk-benefit thinking, evidence-backed dose selection, and a commitment to full transparency with health care professionals.
Change keeps pressing the pharmaceutical industry to do better—to make drugs more accessible, improve shelf stability, and expand treatment options for chronic and rare diseases. KOLLIPHOR HS 15 doesn’t look ready to fade into obscurity. New drug molecules entering pipelines tend to bring new solubility headaches, and established excipients with a baked-in safety record offer a comfort level that innovation alone can’t always match. On the horizon, green chemistry may inspire tweaks to manufacturing, possibly leveraging renewable feedstocks or lower-temperature processes, something that matters as regulatory and market scrutiny of sustainability toughens. Next-generation derivatives or synergies with other excipients could open doors to personalized medicine, injectable biologics, and advanced drug delivery routes. With regulators, industry, and academia watching closely, the continued study of KOLLIPHOR HS 15 promises to shape not just current medicine cabinets but the future toolkit for tackling human and animal health alike.
Kolliphor HS 15 often lands on ingredient lists for a reason. Speaking as someone who has spent years reading up on both over-the-counter and prescription drugs, I know that getting chemicals to blend into something useful often means making things mix that just don’t want to. Oily medicine doesn’t always agree with water. That's where this substance steps in and gets to work.
People working in pharmaceutical labs appreciate Kolliphor HS 15 because it solves stubborn mixing problems. This stuff acts as a surfactant and emulsifier. In plain terms, it helps oily ingredients break down and form a milky blend with water—a critical step for liquid meds. I have seen children’s fever and allergy syrups pour quite smoothly from the bottle thanks to Kolliphor HS 15.
Kolliphor HS 15 pops up in injections, too. Some medicines are only available in oil form, which makes them tricky to put in an injection. As an emulsifier, this ingredient lets oil-based drugs blend well with the watery part of the bloodstream. By making the medicine more compatible with the body, it helps reduce side effects at the same time.
Experts have studied Kolliphor HS 15 for decades. The results matter to anyone who values patient safety. Research in scientific journals, from the International Journal of Pharmaceutics to Food and Chemical Toxicology, has found that this surfactant usually stays stable under harsh conditions, such as heat or strong agitation. Its ability to handle rough treatment makes it useful for manufacturing processes that don’t leave room for mistakes.
Pharmacies aren't the only places that benefit from Kolliphor HS 15. Over-the-counter creams and gels rely on it to mix ingredients that would otherwise stick together in clumps. I have seen this listed on moisturizers for dry skin, gels used to help with pain, and even in some cough syrups. It draws from decades of safe use and careful study, so companies choose it over newer, less predictable chemicals.
Anyone who worries about additives in food or medicine will want straight answers. Decades of tests, including animal studies and human trials, show that Kolliphor HS 15 has a low risk of toxicity at the doses found in medical products. The U.S. Food and Drug Administration and the European Medicines Agency have approved its use in drugs and some cosmetic products.
Allergies and side reactions remain a concern for a small group of people. I saw rare cases where patients reported minor irritation, usually after an injection. That’s why monitoring after giving medicines that use Kolliphor HS 15 remains important, especially with vaccines or therapies meant to be delivered straight into the bloodstream.
Modern pharmaceutical development needs solutions that work for everyone, including those with sensitive systems. Scientists continue to search for alternatives to Kolliphor HS 15, but few match its performance under real-world conditions. The push for plant-derived surfactants and safer synthetic blends continues, but until proven options arrive, Kolliphor HS 15 will keep showing up where reliable mixing is a must.
People like me depend on solid evidence. Whether at the doctor’s office, the drugstore shelf, or in the lab, Kolliphor HS 15 keeps proving itself where the science matters.
Kolliphor HS 15 lands in a lot of pharmaceutical and food products as a solubilizer — the stuff that helps oily ingredients dissolve in water. Derived from castor oil and ethoxylated, it’s a staple in drug manufacturing because many active ingredients do not dissolve well in water on their own. Drugmakers grab Kolliphor HS 15 so pills and liquids mix properly and drugs deliver consistent doses. On labels, you might know it as “polyoxyl 15 hydroxystearate.”
Most food additives and excipients (those “inactive” ingredients) pass through deep testing before ending up in your medicine cabinet. Yet Kolliphor HS 15 brings up legitimate questions. Regulatory sources, including the Joint FAO/WHO Expert Committee on Food Additives, have not set an Acceptable Daily Intake for it. In studies, this compound did not show up as mutagenic or carcinogenic. Still, just because long-term results are not shouting red flags doesn’t automatically mean green lights for daily eating.
In real life, scientists have seen Kolliphor HS 15 can sometimes lead to hypersensitivity reactions, especially in IV drugs. Human bodies can react to oil-based surfactants with rashes or allergy-like symptoms. None of that proves disaster, but it shows people do not all react the same way. Most folks who eat or take medicines with Kolliphor HS 15 do just fine. If you already struggle with allergies or sensitivities, caution cannot hurt.
Pharma companies tend to stick with ingredients that stick with the rules, and Kolliphor HS 15 has earned acceptance for injectable and oral drug products in major markets. I’ve watched regulators ask for more data as drugmakers use these “chemical helpers” in higher and higher doses or new ways. The U.S. Food and Drug Administration and European Medicines Agency collect reports from doctors and patients who’ve experienced reactions with formulations using this surfactant. So far, most events connect to injection, not eating.
At the same time, a lot of patients want clearer info — they want to know what goes into their body and why, and regulators are waking up to that reality. As someone who reads medical records and research for a living, I see a need to push for more real-world tracking. That means long-term registry studies, not just lab tests or short-term clinical trials. People need to know how a compound acts after repeated, year-after-year exposure in food or pills, not just a few months in a lab rat or a single dose in a healthy volunteer.
Companies that rely on Kolliphor HS 15 would do well to take a closer look at what consumers care about. Would a simpler food or drug formula work as well? Could another emulsifier, preferably with more safety history, make a difference? Labeling laws could catch up to the market, spelling out inactive ingredients in plain language instead of hiding behind chemical names.
Real transparency demands drug and food makers share ingredient-level tracking, risk data, and even “how much is too much?” guides. For Kolliphor HS 15, the science so far says most people don’t face big risks at the levels found in legal formulas. For anyone experiencing reactions, or with known allergies, it’s worth checking ingredient lists closely and talking with healthcare providers about alternatives.
If someone in a pharmacy or lab brings up Kolliphor HS 15, they’re probably trying to solve a mixing problem. This white, waxy solid may seem unassuming, but it plays a big role in blending oil and water for medicines and cosmetics that actually work the way they should.
Kolliphor HS 15, which used to go by the name Solutol HS 15, comes out of a reaction between castor oil and ethylene oxide. Over the years, chemists got pretty good at controlling this process, which gives us a product that keeps unpredictable ingredients from separating. The science gets a bit more detailed, though. Its chemical title is polyethylene glycol 15-hydroxystearate. That means it’s a mix of fatty acids from castor oil, mainly ricinoleic acid, connected to about 15 units of ethylene oxide per molecule. You end up with a combination of something naturally oily and something man-made, which adds the ability to pull oil-dissolved substances into water without ruining stability.
To picture Kolliphor HS 15, think of it as a chain. One end holds onto fat-loving substances, the other grabs water. The part derived from castor oil gives the ingredient its oily, “lipophilic” end. The polyethylene glycol arm makes it water-loving, or “hydrophilic.” Without this dual personality, following through on strict drug solubility specs would be nearly impossible.
A typical batch based on manufacturer information contains:
No two batches will be truly identical, but the balance keeps performance steady.
Rarely does an excipient see as much real-world use in both hospitals and industry. Kolliphor HS 15 works as a solubilizer for poorly soluble drugs. If you ever needed to dissolve something like paclitaxel for injection, chances are this ingredient paved the way. Capsule and liquid medicines work best with excipients that prevent clumping or settling, which this chemical does by design.
It’s managed to earn this spot because it’s more than a simple emulsifier. By boosting the ability of water to keep oily molecules dissolved, it increases the absorption of many active molecules in the digestive tract and bloodstream. Experiences with reformulated antihistamines or vitamins usually prove this effect—I’ve seen old tablets give way to liquids that work faster and boast fewer side effects, precisely because the active molecules don’t just sink to the bottom or separate overnight.
People are right to wonder what’s behind their medicines, especially if allergies, chronic illness, or environmental impact are an issue. Kolliphor HS 15 is based on a natural source—castor oil. Castor beans may carry some baggage due to ricin (a deadly toxin in the raw seed), but the oil itself is widely processed into medicines and meets international purity standards. The ethylene oxide component raises eyebrows in some circles because it’s petrochemical-derived, but the resulting compound is stable, and the doses present in medicine or cosmetics land far below those causing harm in studies. Regulators keep an eye out for quality lapses, making recalls rare.
The lesson I draw after years of reading pharmaceutical ingredient lists: chemistry isn’t just about the scary or mysterious. With Kolliphor HS 15, you get a blend that pulls nature and careful engineering together for results that show up in small acts, like a liquid painkiller that doesn’t separate on a pharmacy shelf.
Pharmaceutical folks count on Kolliphor HS 15 for one important reason: solubilizing drugs that barely dissolve in water. Imagine a life-saving medicine that stubbornly refuses to mix into a patient’s IV fluid. Kolliphor HS 15 steps in to break down those barriers. Drug makers use it to create injectable solutions, creams, and even oral drugs where it keeps the active ingredients suspended, so each dose delivers the right punch. Both innovators and generic producers in India, the US, and Europe score consistency from batches where Kolliphor HS 15 keeps particles in check. This action directly shapes patient outcomes—if pain relief or antibiotics arrive too weak or too strong, lives hang in the balance.
My family’s bathroom is stocked with lotions and cleansers, almost all of which list ingredients like “PEG-15 Hydrogenated Castor Oil,” which is Kolliphor HS 15. Manufacturers prize it as an emulsifier—turning oily actives and water-based elements into those creamy textures consumers love. From serums that smooth dry cheeks to sunscreens that glide on skin, Kolliphor HS 15 brings texture and stability. In shampoos and conditioners, it keeps fragrances and moisturizing agents evenly mixed, so every shower feels the same. Regulatory bodies in Europe and North America keep tabs on ingredient safety, so companies pick Kolliphor HS 15 for its clean safety record.
The chemical sector often works behind the scenes, blending and mixing on a scale that dwarfs what we see at home. Here, Kolliphor HS 15 grabs attention as a non-ionic surfactant, especially in coatings, paints, and inks. Its ability to help dyes spread without clumping makes a difference in everything from glossy car finishes to vibrant plastic packaging. In cleaning products, it lifts grime by letting water and oil interact more effectively. Factories that produce lubricants and metalworking fluids often include Kolliphor HS 15 because it holds ingredients together through long periods and harsh conditions.
While not as common as in medicine or cosmetics, Kolliphor HS 15 has some use in food science—partly for flavors and extracts that resist mixing with water. Food makers apply it sparingly, sticking to tight regulations. Drinks aiming for bold flavors or clear appearance sometimes involve surfactants, with Kolliphor HS 15 meeting purity standards in markets like Europe.
One persistent issue: concern over synthetic surfactants in products meant for long-term use or for vulnerable populations. Consumers demand labeling transparency and want reassurance that Kolliphor HS 15 causes no harm over time. Regulators in the EU and US require toxicological data and restrict levels, so manufacturers keep up with new studies on breakdown products and allergen risks. On the technical front, some suppliers invest in improved purification steps and traceability, responding to hospitals and large personal care brands who want to avoid recalls or loss of consumer trust.
Alternatives based on natural oils or new bio-based polymers have begun to surface, but they often miss the track record and versatility Kolliphor HS 15 brings. Makers looking ahead need to watch updates from both safety research groups and environmental agencies, ready to balance performance, safety, and the public’s desire for clean labels.
Many folks in the pharmaceutical and cosmetic industries spend a fair amount of time with raw materials like Kolliphor HS 15. This nonionic surfactant works well as a solubilizer and emulsifier, but from my experience, successful projects heavily depend on how you store and handle it. No matter how good the formulation looks on paper, it can fall flat if supply-chain and storage basics go wrong.
This ingredient loves to attract moisture from the air, so an open container can start to clump or develop soft spots pretty quickly. Once water gets in, it gets tricky: the performance can shift, and microbiological growth sneaks in. I always recommend airtight containers. My old lab used wide-mouth HDPE jars that sealed tight. Right after weighing what we needed, we closed the lid, labeled the jar with the date opened, and put it back on the rack. Even a few minutes of exposure in a humid environment changed things for us.
Kolliphor HS 15 stays solid to semi-solid at cooler temperatures. Stores often see people putting it in hot corners of the warehouse to make transferring or pouring easier—but temperatures over 30°C start to break down the stability and color. Yellowing and oily sweating pop up if it’s kept warm, and the ingredient’s physical properties shift. My best runs happened with room temperatures between 15°C and 25°C. Cold rooms are ideal, but I’ve seen walk-in cabinets, shaded storage, and inventory shelves away from vents work well in pharmacies and compounding centers too.
If a scoop or spatula picks up Kolliphor HS 15 from the container, don’t set that tool on the bench or touch any other substance before reusing it. The residue left over can pull in lint, dust, powder, and even other actives by accident. We used disposable spatulas, but even with good stainless steel gear, fastidious cleaning right after use made a big difference. Other nonionic surfactants in the area can confuse color or composition checks. For teams working with multiple excipients, labeling and dedicated utensils mattered more than I realized early on.
Kolliphor HS 15 rarely bothers skin, but direct contact in high humidity or for extended periods dries out my hands and leaves a waxy feel. Nitrile gloves helped me avoid stickiness and stopped my samples from landing on my skin—or, worse, in my lunch. Good ventilation has always been a must in my spaces, but this isn’t especially volatile. Still, clean air keeps the work scene more manageable.
Shelf life claims run up to 24 months, but only when the drum stays closed and tucked away from light. I found that product at the back of storage sometimes got forgotten and changed consistency. Once the first signs of separation, off-odors, or clumped masses turn up, it’s best to move on. For every shipment or fresh lot, we noted arrival dates, batch number, and container condition. In longer-running operations, periodic review and a first in, first out approach kept us honest.
In the end, storing Kolliphor HS 15 comes down to keeping air, heat, moisture, and stray hands in check. It sounds basic, but every product recall or stability hiccup ends up linked to something simple—someone left the lid off, stored it above the boiler room, or borrowed a scoop from a batch of powder. Reliable storage isn’t glamourous, but it carries the real weight in ingredient performance and safety inside any busy lab or plant.
| Names | |
| Preferred IUPAC name | α-(Hydroxy- poly(oxy-1,2-ethanediyl))–ω–[(2-hydroxy-3,5,5-trimethylhexanoyl)oxy]-poly(oxy-1,2-ethanediyl) |
| Other names |
Solutol HS 15 Polyoxyl 15 Hydroxystearate Macrogol 15 Hydroxystearate PEG 660 12-hydroxystearate |
| Pronunciation | /ˈkɒlɪfɔːr ˌeɪtʃˈɛs ˈfɪfˈtiːn/ |
| Identifiers | |
| CAS Number | 34398-01-1 |
| Beilstein Reference | 1098950 |
| ChEBI | CHEBI:71300 |
| ChEMBL | CHEMBL1208438 |
| ChemSpider | 62956 |
| DrugBank | DB11107 |
| ECHA InfoCard | '100940' |
| EC Number | 9005-66-7 |
| Gmelin Reference | 41556 |
| KEGG | C14653 |
| MeSH | Polyoxyethylene-15-hexadecyl ether |
| PubChem CID | 24893552 |
| RTECS number | GUZ1200000 |
| UNII | 3NE371890G |
| UN number | UN3082 |
| CompTox Dashboard (EPA) | DTXSID5021320 |
| Properties | |
| Chemical formula | (C₂₆H₅₂O₇)n·C₁₆H₃₄O |
| Molar mass | 1344 g/mol |
| Appearance | Pale yellow paste |
| Odor | Slightly fatty |
| Density | 1.05 g/cm³ |
| Solubility in water | Soluble in water |
| log P | 1.68 |
| Vapor pressure | <0.01 hPa (20 °C) |
| Basicity (pKb) | 8.5 |
| Magnetic susceptibility (χ) | -7.74E-5 cm³/mol |
| Refractive index (nD) | 1.465 – 1.475 |
| Viscosity | 110-160 cP (25°C) |
| Dipole moment | 1.1 D |
| Pharmacology | |
| ATC code | A06AG10 |
| Hazards | |
| Main hazards | Causes serious eye irritation. |
| GHS labelling | GHS07: Exclamation mark |
| Pictograms | GHS05,GHS07 |
| Signal word | Warning |
| Hazard statements | Hazard statements: H315, H319, H412 |
| Precautionary statements | Precautionary statements: P280, P305+P351+P338, P310 |
| Flash point | > 120 °C |
| Autoignition temperature | > 370°C (698°F) |
| Lethal dose or concentration | LD50 Oral - Rat - > 5,000 mg/kg |
| LD50 (median dose) | LD50 (median dose): >2,000 mg/kg (rat) |
| NIOSH | There is no NIOSH number for "Kolliphor HS 15". |
| PEL (Permissible) | PEL (Permissible Exposure Limit) for KOLLIPHOR HS 15: "Not established |
| REL (Recommended) | 100.0 mg/mL |
| Related compounds | |
| Related compounds |
Polyoxyl 15 Hydroxystearate Polyethylene glycol 660 hydroxystearate Solutol HS 15 PEG-15 Hydrogenated Castor Oil Cremophor HS 15 |
