The journey of DSPE-PEG(2000) Maleimide traces back to the broader pursuit of merging lipids and polymers for medical technologies. Long before the term "PEGylation" entered the mainstream, scientists noticed that linking polyethylene glycol (PEG) to drugs and biomolecules made them less likely to be gobbled up by the immune system. This quirky combination allowed drugs to last longer in the bloodstream, a big step for therapies that tend to disappear too quickly. The addition of maleimide groups over time took this chemical strategy from the backrooms of chemistry labs to the frontlines of medical research. DSPE-PEG(2000) Maleimide grew out of this tinkering—a phospholipid attached to the flexible PEG chain, capped with maleimide to grab onto thiol groups on proteins or other molecules. Each evolution built on the need for greater stability, better targeting, and the ongoing hope of solving tough delivery problems in biology and medicine.
This compound starts off with DSPE, a tried-and-true phospholipid found in many biological membranes. Joined to PEG, the complex becomes water-friendly and more mobile inside the body. By adding a maleimide group at the tail end, you open up a world of "click chemistry"—the kind of reaction that links a molecule like DSPE-PEG directly to a protein, peptide, or antibody containing a free thiol group. This chemical handshake avoids side reactions, sticks fast, and lets researchers get creative with how drugs, dyes, or probes are attached to surfaces or carriers. The possibilities multiply because DSPE-PEG(2000) Maleimide does not just hide out in the lab. It enters daily research, helping make the vehicles that shuttle drugs through capillary walls, slip past immune patrols, and ferry genetic payloads to hard-to-reach cells.
DSPE-PEG(2000) Maleimide shows up as a white powder or waxy solid, holding a molecular weight in the ballpark of five thousand Daltons if you count the PEG2000 chain. Both ends offer different chemistry; one grabs membranes easily through the lipid anchor, the other grabs thiol groups with its maleimide. The PEG spacer bestows solubility in water and buffers, which goes a long way in biology. The molecule does not dissolve in every solvent—expect to see it swell up in water-friendly mixes, while it resists nonpolars. It handles moderate temperatures but does not like to stick around open to the air for too long, as humidity or strong light may hint at trouble. Many researchers store it in cool, dark places to keep its reactivity in check so the maleimide ring doesn’t lose its grip before it meets a thiol.
Anyone opening a fresh bottle of DSPE-PEG(2000) Maleimide sees clear batch ingredients, lot numbers, and CAS signals for traceability. Purity, measured by NMR or HPLC, often passes 95% for reputable suppliers. Labels detail not just mass but where the reactive maleimide sits, and what terminal groups cover the PEG chain. These details matter when tracking stability or planning scale-ups. Laboratory protocols print exact mass and molarity calculations since the maleimide group counts as the main reactive handle. A quick scan of labeling makes it clear why accuracy and transparency matter, especially for clinical applications where reproducibility means the difference between clinical progress and a dead end.
On the bench, DSPE-PEG(2000) Maleimide originally grew out of a two-step strategy: activating DSPE with a chemical linker, then joining PEG and capping things with maleimide at the final step. Most syntheses rely on mild conditions to protect the sensitive bits, especially the reactive maleimide that only connects to thiols—if you over-heat or expose it to acids or bases, you risk breaking its selectivity. Large-scale manufacturing depends on clean, controlled environments and careful purification to pull off the needed yields. Throughout, waste and byproduct removal come up as crucial—not just to meet purity targets, but to limit environmental footprints downstream.
Chemists use DSPE-PEG(2000) Maleimide for "bioconjugation": joining particles, antibodies, or drugs to liposomes or nanoparticles. The maleimide group forms a sturdy thioether bridge with cysteine residues, anchoring labels, toxins, or recognition ligands right where they belong. This kind of bond stands up to most biological assaults, so payloads stay attached during circulation. Adding or swapping out the PEG length, playing with linker positions, or tacking on dyes pushes the chemistry even farther. Labs work on both new modifications and ways to recycle starting materials, since the PEG and lipid backbones usually serve as the building blocks for future iterations. The continued hunt for faster, “greener” chemistries sits in tandem with growing demands for higher specificity in applications like imaging, diagnostics, and smart drug delivery.
Go looking in catalogs, and DSPE-PEG(2000) Maleimide comes up by a few aliases: 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[maleimide(polyethylene glycol)-2000], and shorter tags like DSPE-PEG-MAL or DSPE-PEG2000-Maleimide. Each branding tracks slightly different batch origins or PEG lengths, yet the backbone function remains. Many researchers refer to it simply through its building blocks: phospholipid + PEG(2000) + maleimide, which often sketches out precisely what each project demands.
Lab workers dealing with DSPE-PEG(2000) Maleimide respect clear safety boundaries from day one. Gloves, goggles, and ventilation offset risks that go with fine powders and reactive groups. The maleimide handle, meant for thiol chemistry, can irritate skin or eyes, and accidental inhalation should mean medical attention. Regular training forces home the point: even the most “biocompatible” PEGylated compounds can pack a punch in concentrated form. Waste disposal rises up as a standard concern due to the PEG backbone and possible lipid breakdown products. Chemical hygiene rules do more than tick off regulatory boxes—they help keep downstream products clean and trustworthy for research and medical uses. Repeat audits and stability tests make sure new manufacturing lots match up to those that have already passed animal or early human trials, avoiding surprises later.
Take a tour through the latest research, and DSPE-PEG(2000) Maleimide weaves its way through all sorts of innovation. Drug delivery stands out; liposomes and nanoparticles harness the amphiphilic DSPE anchor and stealthy PEG shell to carry chemotherapy drugs that would otherwise ravage healthy tissue. By coupling targeting peptides or antibodies to the maleimide group, these carriers zero in on specific cells—cancer, inflamed tissue, or even stubborn viral hiding spots. DSPE-PEG(2000) Maleimide also pops up in vaccine development as a component of lipid-based nanoparticles, giving mRNA or protein payloads a stable ride while tuning immune activation. Diagnostic imaging grabs a slice, too, as researchers attach probe molecules or radioisotopes directly to DSPE-PEG carriers. Even outside of medicine, the ability to link almost any thiol-containing molecule finds a home in biosensors, surface coatings, and environmental monitoring platforms.
The R&D pipeline for DSPE-PEG(2000) Maleimide moves quickly. Teams always look for longer circulation times, better targeting, and safer breakdown. Many clinical pipelines draw on hundreds of peer-reviewed studies showing how DSPE-PEG-laden liposomes or nanoparticles outperform traditional drugs by cutting toxicity and raising targeting accuracy. Developers follow references from top journals, cross-verify with animal studies, and push to scale up with minimal chemistry tweaks. Fresh efforts focus on building increasingly complex “multi-headed” carriers that carry more than one cargo or combine drug and diagnostic probes in a single nanoparticle, for faster, clearer answers at the patient’s bedside. As patents expire and new production methods come online, prices drop and more independent labs join the party, multiplying the possible combinations and discoveries.
Questions about PEGylated lipids and their breakdown products pop up often, especially as more therapies enter clinical trials. Animal data points to generally low toxicity, especially below certain dose thresholds, though rare allergic reactions or immune responses have put the spotlight on long-term exposure. DSPE-PEG(2000) Maleimide rides on this same safety record, helped by its widespread use in approved therapies and consistent results in cell culture and animal models. Toxicologists keep careful watch, testing for unexpected breakdown, inflammatory signals, and the impact of PEG “antibodies” that can build up with repeated dosing. Regulators demand continued clarity: every new formulation carries fresh questions about accumulation and metabolism. Labs answer by running longer-term studies and comparing fresh data with decades of archived results.
Glimpses of the future show DSPE-PEG(2000) Maleimide branching out from old formulas to help new therapies reach tough targets, like the blood-brain barrier or deep-seated tumors resistant to current options. As synthetic chemistry becomes greener and more precise, expect lower-cost versions to make their way into emerging economies and local startups. Bigger PEG chains, smarter targeting ligands, and “on-demand” release systems float through grant proposals and research conferences. DSPE-PEG(2000) Maleimide anchors these dreams by showing how patient-friendly delivery, stability, and chemistry go hand in hand. Anyone in the field watches the horizon for safer, more creative uses—because every success with a PEGylated lipid means a little less wasted medicine, and some hope for patients waiting for better options.
DSPE-PEG(2000) Maleimide isn’t the type of chemical name you toss around in daily conversation, but the impact this molecule has on medicine gets people talking in research circles and biotech labs. This compound plays a key role in making advanced drug delivery possible. Behind the scenes, countless scientists rely on DSPE-PEG(2000) Maleimide to help package and deliver life-saving drugs right where they're needed. That level of precision changes the lives of people living with tough-to-treat illnesses.
This ingredient belongs to a class of molecules called phospholipids, linked to polyethylene glycol (PEG), topped with a maleimide group. The long, flexible PEG chain behaves almost like a flexible leash that allows medicines to sneak past the body's immune watchdogs. The maleimide group is the real connector here—its job is to grab onto specific proteins or other biological targets with strong, stable bonds.
Creating these bonds means that scientists can attach all kinds of cargos to nanoparticles—a targeted cancer drug, for example—or design nanoparticles that only stick to a certain tissue. This is huge when treating diseases like cancer. Healthy cells get a break, while medicines zero in on abnormal ones. As someone who has seen the harsh side effects loved ones experience with chemotherapy, I believe smarter targeting will change what treatment means.
Medications don’t always go where you want. The body has a knack for filtering out foreign invaders fast. DSPE-PEG(2000) Maleimide helps cloak nanoparticle drugs, so they dodge these natural defense systems. This means drugs can stay in the circulation longer, reach the intended cells, and deliver the right dose at the right time.
Right on the frontlines, some COVID-19 vaccines and new cancer treatments already rely on liposomes made with similar PEG-lipids. The maleimide piece boosts these vehicles by allowing specific antibodies or peptides to snap onto the particle surface, making medicine delivery far more personal. Studies published in Nature and Science report leaps in treatment results using this technology.
Progress never comes without bumps. DSPE-PEG(2000) Maleimide works well but can spur unwanted immune reactions in a small number of people. PEG allergies popped up in a handful of patients who received mRNA COVID-19 vaccines; after years in the lab, this caught many off guard.
Cost stands out as a real barrier, too. These customized molecules require complicated production and thorough safety testing. Patients in wealthier countries get new therapies faster, while others wait. Watching wealth gaps grow can feel unfair, especially once the science shows just how effective targeted drugs can be.
The future looks promising for DSPE-PEG(2000) Maleimide. More researchers work on developing safer alternatives and ways to drop the price. Community-based trials and open-source data sharing could drive faster breakthroughs. Governments and nonprofits can step in to support global access.
Healthcare innovation depends on these chemical building blocks, yet the science only works if it reaches people in the real world. DSPE-PEG(2000) Maleimide won’t be a household name, but its impact continues to grow, one carefully packaged medicine at a time.
Looking at shelves packed with vials and reagents, one thing always stands out: sloppy storage costs real money and wastes good science. DSPE-PEG(2000) Maleimide, an essential building block in drug delivery and nanomedicine, quickly turns useless if exposed to heat, moisture, or oxygen for too long. This compound includes a delicate maleimide group, notorious for reacting with even trace amounts of water. If your lab has ever experienced an unexplained loss of activity in a batch, bad storage probably had a hand in it.
Every bottle straight from suppliers usually comes with warnings. Ignore them, and costly material loses potency. Use a freezer set to -20°C, and make sure every container gets vacuum-sealed, or at the very least, tightly capped under dry argon or nitrogen. Don’t count on ordinary desiccant packs to pull enough moisture. Silica gel only gets you so far; a sealed desiccator or glove box with dry atmosphere makes a bigger difference over months.
Leave the stock on a bench, especially during humid days, and degradation sets in fast. In groups with heavy throughput, I’ve watched colleagues move DSPE-PEG(2000) Maleimide in and out of fridges daily under room lights—only to throw half of it away weeks later because the reactive end group had disappeared. Take only what you need, then return the rest to cold storage right away. Snap-freezing the dissolved material in small aliquots avoids repeat freeze-thaw cycles, which chip away at shelf life.
Too many researchers treat these lipids like robust lab staples. Someone once insisted that long shelf life comes by just screwing the cap on tight. That never works out well. Polyethylene glycol chains suck up water vapor, and with it, those sensitive chemical groups hydrolyze. Direct sunlight on vials doesn’t just warm them—it also messes with the chemical stability. Try leaving a sample under room light for a few days. A proper test with HPLC usually reveals unpleasant surprises: shifted peaks, missing product, reduced reactivity.
I’ve seen people re-dissolve the powder in solvents like chloroform, expecting to store that solution long-term. Unless you blow in dry gas and store in amber vials at low temps, the shelf life drops significantly. Always label with clear dates and storage conditions. That stops confusion later and avoids wasted runs.
Teaching everyone who uses these compounds isn’t just a formality. Supply chain hiccups and budget crunches mean replacement stock can take weeks. Regular checks help: does the vial look clumped, frosting over, or off-color? Those are signs moisture got in or degradation is underway. Set a routine to inspect stocks once a month.
Plenty of labs never see issues precisely because folks follow the basics—cold storage, dry atmosphere, careful handling. Manufacturers and academic consortia both support this; papers from established nanomedicine groups and technical datasheets from major vendors reinforce the advice. Storing such specialized lipids right keeps research on schedule, lowers costs, and avoids the frustration of failed experiments. Careful handling may feel tedious, but it always pays off in consistent, reliable results.
DSPE-PEG(2000) Maleimide isn’t a compound you find in the average chemistry class. Researchers lean on it when crafting liposomes, micelles, or drug delivery systems—anything where a little bit of lipid magic is needed to anchor polymers to cell surfaces or attach targeting ligands. The maleimide end loves to react with thiol groups, turning a simple phospholipid into a molecular multitool. Before any of that happens, though, it demands one simple thing: a proper solution.
DSPE-PEG(2000) Maleimide has a long, fatty tail on one end and a hydrophilic PEG chain on the other, kind of like a tug-of-war between oil and water. Anyone who has tried mixing oil and water knows—you can’t force them together by wishful thinking.
Chloroform works easily as a solvent here. The compound slides into solution with minimal fuss, letting researchers prep thin films for later hydration steps. Ethanol and methanol often make it onto the bench, too, especially for those who want something less toxic than chloroform. These organic solvents break down the stubborn hydrophobic interactions of the lipid tail, helping the compound spread out instead of clumping up on the side of the vessel.
If a project calls for DSPE-PEG(2000) Maleimide in water, patience and gentle heat help more than brute force. It dissolves poorly in cold buffers, often forming milky suspensions that don’t cut it for downstream chemistry. By tipping the flask into a water bath at 60–70°C and stirring, the compound starts to coax itself into true solution. It pays to avoid boiling—nobody wants to wreck the maleimide group at high temperatures. Staff tend to keep buffer solutions at neutral or slightly acidic pH. If the pH runs too high, the maleimide warps into unhelpful byproducts.
Anyone in a rush grabs a sonicator. These lab tools blast the solution with sound waves, breaking up clumps and speeding dissolution. Filtration clears out what the naked eye misses, and the result looks clear to both scientist and microscope. Yet, experience matters: too much sonication or heat, and the delicate DSPE-PEG backbone falls apart, wasting both money and time.
Dirty glassware or impure solvents sneak contaminants into the mix, interfering with reactions later on and messing with data. Labs with tight budgets might try to cut corners on solvents, but expensive reagents like DSPE-PEG(2000) Maleimide don’t forgive small mistakes. Pure solvents, dust-free flasks, and meticulous technique mean more than just tradition; they set the scene for reproducible research.
Training goes a long way. People who learn hands-on, whether from experienced staff or careful trial and error, get the best results. Careful note-taking in the lab notebook—temperature, solvent, method—makes all the difference both for your own work and for those who follow later. Supplier datasheets rarely spell out every trick, but networking with colleagues can fill in gaps that reading alone leaves.
In over a decade of bench work, I’ve watched junior researchers save hours by learning these tips early. DSPE-PEG(2000) Maleimide costs enough to make mistakes painful, both to the pocketbook and to timelines. Careful handling, respect for chemistry, and a willingness to get your hands dirty matter just as much as theory. Dissolving tricky molecules isn’t just about textbooks: it’s about experience, teamwork, and the rhythm of real lab life.
Every time I walk through a university lab or talk with biotech entrepreneurs, I hear about DSPE-PEG(2000) Maleimide. This molecule often shows up in cutting-edge therapies and drug delivery systems. Molecular weight might sound like a technical detail, yet it shapes how DSPE-PEG(2000) Maleimide behaves inside the body and during formulation. The number—about 3400 Daltons—might seem unremarkable. For people working on liposome formulation or surface engineering, that number underpins a lot of critical decisions.
DSPE-PEG(2000) Maleimide fuses a phospholipid, a polyethylene glycol (PEG) chain, and a maleimide group. The DSPE segment stands for distearoylphosphatidylethanolamine, a reliable base for creating stable bilayers. When you attach a PEG chain with a mean length of 2000 Daltons, you grant the molecule both water solubility and stealth features that help nanoparticles avoid immune detection. The maleimide group lets researchers covalently bond peptides or proteins onto the surface. So, every piece of this hybrid molecule has a job, and the full molecular weight—around 3400 Daltons, factoring in the PEG distribution—ties these functions together.
Picking the right molecular weight means tuning your drug carrier’s performance. In my experience working with pharmaceutical start-ups, you can’t just swap out PEG chains without seeing real-world consequences. Too short, and clearance from the bloodstream happens fast. Too long, and the delivery system can get bulky, sacrifice targeting, or even introduce immunogenicity. Around 2 kDa for PEG seems to hit a balance, offering circulatory time and flexible chemistry. So, for DSPE-PEG(2000) Maleimide, a molecular weight in the 3400 Dalton range lets researchers strike that tricky balance between solubility, stability, and functionalization.
Many cancer drugs rely on this kind of phospholipid-PEG-maleimide combination. Think about how COVID-19 mRNA vaccines went from freezer to patient. Lipid nanoparticles kept those strands protected and, in many cases, used PEGylated lipids for shielding. DSPE-PEG(2000) Maleimide plays a similar role in other therapies, letting targeting ligands attach to the surface. Getting the molecular weight right means your formulation can circulate longer and deliver its cargo where it matters.
Not all molecular weights are created equal. Sourcing can be tricky because “PEG(2000)” refers to a mean value, so batches carry some variability. When I checked spec sheets from several suppliers, small fluctuations in PEG length crept in. Those variations can impact project reproducibility—a big problem for teams trying to move therapies to clinical trials. To navigate this, teams need tighter quality control, batch testing, and sometimes custom synthesis.
Building on cross-disciplinary experience, collaboration often smooths out technical headaches. Chemists, biologists, and regulatory experts need to speak the same language about molecular weight specifications. Open sharing of analytical data and supplier transparency helps. More robust analytics—using mass spectrometry or chromatography—can nail down the precise composition of DSPE-PEG(2000) Maleimide. Investment in rigorous sourcing strategies and more accurate reporting from suppliers closes the gap between theory and practice.
As the world of biotechnology speeds along, some names keep popping up for good reason. DSPE-PEG(2000) Maleimide turns out to be a workhorse compound for those aiming to add a pinch of engineering to their biomolecules. It’s a hybrid structure, part lipid and part polymer chain, finished off with a reactive maleimide tip. In real-world terms, scientists like it because it welds together water-loving and fat-loving components, all while offering a chemical handle for linking proteins, peptides, antibodies, and other molecular tools.
No one spends this much time tinkering with molecules for nothing. Modern medicine, especially when dealing with targeted drugs or imaging tools, relies on putting the right label or tailor-made tag where it counts. DSPE-PEG(2000) Maleimide gives scientists a reliable way to bring liposomes, micelles, or nanoparticles into the mix, so drugs stick around longer in the blood or seek out tricky targets like cancer cells. When treatments find the right location, side effects can drop, and results tend to improve. More targeted action also means less waste, which keeps costs down for labs and patients alike.
Getting DSPE-PEG(2000) Maleimide to hug a biomolecule isn’t mystery magic, but it does need thoughtful planning. The maleimide reacts with a thiol group—what many biologists call a “sulfhydryl.” These show up on cysteine residues in proteins, or you can add them to molecules using simple chemistry. The key factor is making sure both the DSPE-PEG and the thiol-containing partner are dissolved in compatible solutions. Once mixed, the maleimide seeks out the thiol, settles in, and forms a stable covalent bond. Usually, researchers handle all this in gentle buffers like PBS at a slightly basic pH, letting the chemistry do the work within a few hours at room temperature. Afterward, they remove unreacted bits with dialysis or size-exclusion, leaving just the attached product.
Lab talk sounds tidy, but people face setbacks. Thiols can break or rearrange if exposed to too much oxygen, so a careless technique leads to weaker reactions. Not all proteins sit ready with an available cysteine, and too many chemical steps risk harming function. Even after linking, the new biomolecule needs to stay stable in the body—immune systems and enzymes often jump in to snip apart the connection. For anyone who works in formulation or clinical trials, the challenge always revolves around keeping the right balance between stability and functionality. Getting the ratio right between DSPE-PEG(2000) Maleimide and the thiol partner requires some trial and error along with solid measurement skills, such as mass spectrometry and chromatography.
Many researchers have found success by modifying reaction conditions or tweaking the ratio of reactants. Pre-treating proteins to expose more cysteines or engineering extra cysteines onto their structures has turned into a common trick. Those with more experience sometimes swap out traditional purification steps for newer ultrafiltration methods, reducing material loss. Better sensors and analytic tools let teams keep a close eye on the conjugation process in real time, leading to smarter adjustments on the fly. Sharing lessons learned and data across research groups speeds up problem solving and drives down the risk of repeating earlier mistakes.
No single process pulls all the weight. DSPE-PEG(2000) Maleimide conjugation has given researchers a valuable way to build more targeted therapies and diagnostic tools. By focusing more on practical solutions—like reshaping reaction setups, using smarter protein designs, and deploying accurate analytics—scientists keep pushing the boundaries of personalized medicine and safer drug delivery. As these techniques continue to spread, both patients and healthcare providers can expect new treatment options that speak more directly to real-world needs.
| Names | |
| Preferred IUPAC name | N-(carbonyl-methoxy(polyethyleneoxy)-2000)-1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-(maleimido) |
| Other names |
1,2-Distearoyl-sn-glycero-3-phosphoethanolamine-N-[maleimide(polyethylene glycol)-2000] DSPE-PEG-Mal DSPE-PEG(2000)-Mal DSPE PEG Maleimide DSPE-PEG2000-Maleimide |
| Pronunciation | /diː-ɛs-piː-iː-piː-iː-dʒiː tuː ˈθaʊzənd məˈleɪ.ɪˌmaɪd/ |
| Identifiers | |
| CAS Number | 161937-79-5 |
| Beilstein Reference | 3528445 |
| ChEBI | CHEBI:140129 |
| ChEMBL | CHEMBL4297575 |
| ChemSpider | 15746872 |
| DrugBank | DB11101 |
| ECHA InfoCard | 07d7f15e-bf3e-4894-9e06-b8b13eae3abc |
| Gmelin Reference | 8588406 |
| KEGG | C22161 |
| MeSH | C22H44NO7P |
| PubChem CID | 71587761 |
| RTECS number | VX8250000 |
| UNII | 8O41WS6U6Z |
| UN number | UN3077 |
| Properties | |
| Chemical formula | C114H224N3O50P2 |
| Molar mass | 2805.52 g/mol |
| Appearance | White solid powder |
| Odor | Odorless |
| Density | 0.98 g/cm³ |
| Solubility in water | Soluble in water |
| log P | -2.41 |
| Acidity (pKa) | pKa ~ 2.1 |
| Basicity (pKb) | Basicity (pKb): 13.71 |
| Refractive index (nD) | 1.47 |
| Dipole moment | 2.34 D |
| Hazards | |
| Main hazards | Hazardous if swallowed, inhaled, or absorbed through skin; may cause irritation to skin, eyes, and respiratory tract. |
| GHS labelling | GHS07, GHS08 |
| Pictograms | GHS07,GHS08 |
| Signal word | Warning |
| Hazard statements | H315, H319, H335 |
| Precautionary statements | Precautionary statements: P261, P264, P271, P272, P273, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P333+P313, P362+P364, P337+P313, P501 |
| Flash point | > 230°C |
| LD50 (median dose) | LD50: >5 g/kg (mouse, intravenous) |
| NIOSH | RX9655000 |
| PEL (Permissible) | PEL (Permissible Exposure Limit) for DSPE-PEG(2000) Maleimide: Not established |
| REL (Recommended) | 0.005-0.02% |
| IDLH (Immediate danger) | Not established |
| Related compounds | |
| Related compounds |
DSPE-PEG(2000) DSPE-PEG(2000) Amine DSPE-PEG(2000) Carboxyl DSPE-PEG(2000) NHS DSPE-PEG(2000) Azide DSPE-PEG(2000) Biotin DSPE-PEG(2000) Methoxy |