Protein Modification Reagents
![eMolecules Broadpharm / N-(DBCO-N-amido-PEG4)-N-Biotin-PEG4-t-Boc-Hydrazide / 50mg / 591908425 / BP-25523 / 98.000 / / [null] / 1112.350 / C55H81N7O15S](https://assets.fishersci.com/TFS-Assets/CCG/product-images/502475922.JPG-250.jpg)
eMolecules Broadpharm / N-(DBCO-N-amido-PEG4)-N-Biotin-PEG4-t-Boc-Hydrazide / 50mg / 591908425 / BP-25523 / 98.000 / / [null] / 1112.350 / C55H81N7O15S
Broadpharm / N-(DBCO-N-amido-PEG4)-N-Biotin-PEG4-t-Boc-Hydrazide / 50mg / 591908425 / BP-25523 / 98.000 / / [null] / 1112.350 / C55H81N7O15S
eMolecules Hydroxy-PEG5-CH2CO2tBu | 1807530-05-7 | MFCD27977509 | 1g
Broadpharm | Hydroxy-PEG5-CH2CO2tBu | 1g | 229582202 | BP-22097 | 95.000 | 1807530-05-7 | MFCD27977509 | 352.424 | C16H32O8
If you are unable to find the chemical you are looking for, make sure you are logged into your fishersci.com account and click on the following link:
eMolecules Building Block Tool
Cayman Chemical XnthIn amIn congenr 25mg
A non-selective adenosine receptor antagonist (Kbs = 83, 25, and 15 nM for rat PC 12 cells, human platelets, and rat fat cells, respectively); reduces NECA-stimulated adenylate cyclase activity in human platelets (EC50s = 1 and 0.31 μM in the presence and absence of XAC, respectively); reverses R-PIA-induced inhibition of isoproterenol-stimulated adenylate cyclase activity in rat fat cell membranes (IC50s = 146 and 26 nM in the presence and absence of XAC, respectively); reverses 2-CADO-, R-PIA-, and NECA-induced reductions in heart rate and blood pressure in rats (0.1-1.0 mg/kg); induces convulsions in mice (39.8 mg/kg)
Medchemexpress LLC 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-PEG-thiol | >95.0% | 25 MG
DSPE-PEG-SH (average MW 1,000 Da) is a thiol-terminated PEGylated phospholipid combining a DSPE lipid anchor with a polyethylene glycol spacer that ends in a reactive sulfhydryl. Supplied as a solid, it is used to introduce surface-accessible thiol groups into liposomes, lipid nanoparticles, and other lipid assemblies for bioconjugation and targeted delivery applications.
- Provides a lipid anchor for stable incorporation into bilayers.
- Contains a terminal thiol (-SH) for conjugation to thiol-reactive reagents.
- Average molecular weight ~1,000 Da for the PEG spacer.
- Facilitates surface functionalization of nanoparticles and liposomes.
- Typically supplied as a powder with high purity (≥95%).
- Useful for preparing targeted delivery systems and bioconjugates.
Medchemexpress LLC DSPE-NHS | 1383932-86-2 | MFCD34561791 | 95.0% | 945.21 g/mol | C49H89N2O13P | 5 MG
DSPE-NHS is an NHS-activated phospholipid reagent used for bioconjugation and liposome/nanocarrier preparation. It contains two hydrophobic stearoyl tails and an NHS ester that reacts with primary amines to form stable amide bonds; in aqueous solution it self-assembles into lipid bilayers and is commonly used to label antibodies and conjugate proteins.
- Reacts with primary amines to form stable amide linkages.
- Self-assembles into lipid bilayers in aqueous solution.
- Suitable for antibody labeling and protein conjugation.
- Solid form with practical storage recommendations for solvent and sealed conditions.
- Provided at high purity for research applications.
eMolecules Bromo-PEG24-t-butyl ester | | | 250mg
Broadpharm | Bromo-PEG24-t-butyl ester | 250mg | 452533439 | BP-24007 | 98.000 | | | 1266.355 | C55H109BrO26
If you are unable to find the chemical you are looking for, make sure you are logged into your fishersci.com account and click on the following link:
eMolecules Building Block Tool
Medchemexpress LLC Mal-amido-PEG1-C2-NHS ester | 1260092-50-9 | 99.7% | 381.34 | C16H19N3O8 | 50 MG
Mal-amido-PEG1-C2-NHS ester is a non-cleavable antibody-drug conjugate (ADC) linker that contains a maleimide group and an N-hydroxysuccinimide (NHS) ester, used for bioconjugation to label primary amines on proteins, oligonucleotides, and other amine-containing molecules. The product is supplied as a high-purity, white to off-white solid and requires cold, inert storage to maintain stability.
- Contains maleimide and NHS ester functional groups.
- Enables selective labeling of primary amines.
- High purity (≈99.7%).
- Molecular weight 381.34 and formula C16H19N3O8.
- Available in multiple sizes including 50 mg.
- Store at -20°C, protect from light, under nitrogen; in solution: -80°C up to 6 months.
Selleck Chemical LLC Mal-PEG2-AZD-E1273-5MG
Mal-amido-PEG2-C2-amido-Ph-C2-CO-AZD (Mal-PEG2-AZD) is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs
Medchemexpress LLC Cl-PEG4-acid 50mg
Cl-PEG4-acid is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs[1]
Medchemexpress LLC DBCO-PEG4-triethoxysilane | 2353410-02-1 | MFCD31811544 | 95.0% | C39H57N3O10Si | 10MG
DBCO-PEG4-triethoxysilane is a DBCO-functionalized PEG4 linker with a triethoxysilane end group, formulated for copper-free click chemistry and silane-based surface coupling. It is supplied as a colorless to light yellow liquid with good solubility in DMSO and is commonly provided at ~95% purity.
- Provides a dibenzocyclooctyne (DBCO) group for copper-free click reactions.
- Includes a PEG4 spacer to improve solubility and reduce steric hindrance.
- Features a triethoxysilane moiety for covalent attachment to silica and glass surfaces.
- Liquid form enables straightforward solution-phase handling and surface functionalization.
- Soluble in common organic solvents such as DMSO, facilitating formulation and reactions.
Nanocs Biotin PEG Maleimide, 100mg
Purity: >95%, Solubility: Soluble in water, Biotin PEG Maleimide is one of Nanocs pegylated Biotinylation reagents with an activated maleimide group. Maleimide is able to react with thiol/sulfhydryl groups rapidly and specifically at neutral pH. Reaction between maleimide and thiol group enables fast conjugation of biotin tag to targeted molecules or material surfaces. Resulted biotin moiety can bind to avidin or streptavidin with high affinity. PEG linker between biotin and maleimide offers better water solubility, reduced steric hydrance and enhanced stability.
Medchemexpress LLC Mal-PEG36-NHS ester | 95.0% | 1923.18 g/mol | C86H159N3O43 | 5 MG
Mal-PEG36-NHS ester is a polyethylene glycol (PEG)-based bifunctional linker bearing a maleimide and an N-hydroxysuccinimide (NHS) ester. Supplied for research use, it is designed for bioconjugation and PROTAC synthesis, enabling sequential coupling to thiol and amine groups.
- Maleimide and NHS ester functional groups for thiol and amine coupling.
- PEG spacer (36 units) provides flexibility and solubility.
- Molecular weight 1923.18 g/mol.
- Purity 95.0%.
- Soluble in DMSO at 62.5 mg/mL (requires ultrasonic agitation).
- Storage: pure form -20°C; in solvent -80°C (6 months) or -20°C (1 month).
- Intended for research use only.
Medchemexpress LLC 1,2-Distearoyl-sn-Glycero-3-Phosphoethanolamine-N-azide | 2839508-98-2 | 96.4% | 831.11 g/mol | C43H83N4O9P | 5 MG
DSPE-N3 is an azide-functionalized distearoyl phosphoethanolamine used as a click-chemistry lipid for bioconjugation and nanoparticle formulation. The amphiphilic molecule presents an azide headgroup that enables copper-catalyzed azide-alkyne cycloaddition (CuAAC) to attach alkyne-containing probes, polymers, or targeting ligands, and is commonly applied in liposome and micelle formation, surface functionalization, and targeted delivery research.
- Contains an azide functional group for bioorthogonal click chemistry
- Amphiphilic structure supports liposome and micelle formation
- Suitable for conjugation of alkyne-bearing molecules via CuAAC
- High chemical purity for research-grade applications
- Store sealed at 4°C and protect from moisture for stability
- Available in small lab-scale quantities for formulation work
![eMolecules 3-Amino(peg4)propionic acid biotinamide | Combi-Blocks | 721431-18-1 | MFCD08457831 | 491.600 | C21H37N3O8S | 98.000 | OC(=O)CCOCCOCCOCCOCCNC(=O)CCCC[C@@H]1SC[C@@H]2NC(=O)N[C@H]12 | 1g | 335350416](https://assets.fishersci.com/TFS-Assets/CCG/product-images/NC1767738.jpg-250.jpg)
eMolecules 3-Amino(peg4)propionic acid biotinamide | Combi-Blocks | 721431-18-1 | MFCD08457831 | 491.600 | C21H37N3O8S | 98.000 | OC(=O)CCOCCOCCOCCOCCNC(=O)CCCC[C@@H]1SC[C@@H]2NC(=O)N[C@H]12 | 1g | 335350416
3-Amino(peg4)propionic acid biotinamide | Combi-Blocks | 721431-18-1 | MFCD08457831 | 491.600 | C21H37N3O8S | 98.000 | OC(=O)CCOCCOCCOCCOCCNC(=O)CCCC[C@@H]1SC[C@@H]2NC(=O)N[C@H]12 | 1g | 335350416
