Protein Modification Reagents
Medchemexpress LLC Propargyl-PEG4-NHS ester | 1428629-70-2 | 97.0% | 357.36 g/mol | C16H23NO8 | 500 MG
Propargyl-PEG4-NHS ester is an alkyne-terminated, four-unit polyethylene glycol (PEG4) N-hydroxysuccinimide (NHS) ester designed for bioconjugation and click chemistry. It couples to primary amines via NHS chemistry and provides an alkyne handle for copper-catalyzed azide-alkyne cycloaddition (CuAAC), suitable for linker and labeling applications.
- Alkyne-terminated PEG4 linker for click chemistry.
- Reacts with primary amines via NHS ester chemistry.
- Non-cleavable four-unit PEG spacer to improve solubility and reduce steric hindrance.
- Suitable for antibody-drug conjugation and general bioconjugation workflows.
- High purity for reproducible conjugation results.
Medchemexpress LLC Dspe-peg-fluor 647 | 95.4% | 5000 | 1 MG
DSPE-PEG-Fluor 647, MW 5000 is a PEGylated lipid with a DSPE group and a Fluor 647 fluorophore. DSPE is a phospholipid. Fluor 594 is a red water-soluble dye.
- Pegylated lipid
- Contains DSPE group and a Fluor 647 fluorophore
- DSPE is a phospholipid
- Fluor 594 is a red water-soluble dye
Broadpharm BDP FL-PEG4-TCO | 2183473-16-5 | MFCD31580132 | 5mg
BDP FL-PEG4-TCO | Putity: 98% | MW: 662.6 | 2183473-16-5 | MFCD31580132 | 5mg
eMolecules 14-(Amine-PEG5-ethylcarbamoyl)tridecanoic-t-butyl ester | Broadpharm |576.816 | C30H60N2O8 | 95.000 | CC(C)(C)OC(=O)CCCCCCCCCCCCC(=O)NCCOCCOCCOCCOCCOCCN | 100mg | 784455389
14-(Amine-PEG5-ethylcarbamoyl)tridecanoic-t-butyl ester | Broadpharm |576.816 | C30H60N2O8 | 95.000 | CC(C)(C)OC(=O)CCCCCCCCCCCCC(=O)NCCOCCOCCOCCOCCOCCN | 100mg | 784455389
![eMolecules 2107273-36-7 | Bis-(N,N'-amine-PEG3)-Cy5, TFA salt | Broadpharm855.430 | C43H62ClF3N4O8 | 95.000 | [Cl-].OC(=O)C(F)(F)F.CC1(C)\C(=C/C=C/C=C/C2=[N+](CCOCCOCCOCCN)c3ccccc3C2(C)C)N(CCOCCOCCOCCN)c2ccccc12 | 5mg | 306709104](https://assets.fishersci.com/TFS-Assets/CCG/product-images/502203309.JPG-250.jpg)
eMolecules 2107273-36-7 | Bis-(N,N'-amine-PEG3)-Cy5, TFA salt | Broadpharm855.430 | C43H62ClF3N4O8 | 95.000 | [Cl-].OC(=O)C(F)(F)F.CC1(C)\C(=C/C=C/C=C/C2=[N+](CCOCCOCCOCCN)c3ccccc3C2(C)C)N(CCOCCOCCOCCN)c2ccccc12 | 5mg | 306709104
Bis-(N,N'-amine-PEG3)-Cy5, TFA salt | Broadpharm | 2107273-36-7855.430 | C43H62ClF3N4O8 | 95.000 | [Cl-].OC(=O)C(F)(F)F.CC1(C)\C(=C/C=C/C=C/C2=[N+](CCOCCOCCOCCN)c3ccccc3C2(C)C)N(CCOCCOCCOCCN)c2ccccc12 | 5mg | 306709104
eMolecules Combi-Blocks DBCO-PEG4-NHS ester 100mg 303348570 QJ-9191 95 000 1427004-19-0 MFCD26793797 649 697 C34H39N3O10
Combi-Blocks DBCO-PEG4-NHS ester 100mg 303348570 QJ-9191 95 000 1427004-19-0 MFCD26793797 649 697 C34H39N3O10
Medchemexpress LLC Alkyne-SNAP | 1104822-07-2 | C18H18N6O2 | 1 MG
Alkyne-SNAP is an alkyne-conjugated benzylguanine. Its benzylguanine moiety reacts with the SNAP-tag, enabling irreversible and covalent labeling of SNAP fusion proteins with an additional alkyne functionality for subsequent click chemistry conjugation.
- Alkyne-conjugated benzylguanine
- Enables irreversible and covalent labeling of SNAP fusion proteins
- Provides alkyne functionality for click chemistry conjugation
- White to off-white solid appearance
- For research use only
- Purity of 99.32%
![eMolecules Broadpharm / N-(Acid-PEG36-PEG3-)-N-bis(PEG3-biotin) / 25mg / 761705542 / BP-28868 / 98.000 / / [null] / 2681.280 / C120H230N8O52S2](https://assets.fishersci.com/TFS-Assets/CCG/product-images/502474111.JPG-250.jpg)
eMolecules Broadpharm / N-(Acid-PEG36-PEG3-)-N-bis(PEG3-biotin) / 25mg / 761705542 / BP-28868 / 98.000 / / [null] / 2681.280 / C120H230N8O52S2
Broadpharm / N-(Acid-PEG36-PEG3-)-N-bis(PEG3-biotin) / 25mg / 761705542 / BP-28868 / 98.000 / / [null] / 2681.280 / C120H230N8O52S2
Medchemexpress LLC DBCO-PEG4-Biotin | 1255942-07-4 | 99.5% | 25 MG
DBCO-PEG4-Biotin is an azadibenzocyclooctyne-biotin derivative containing a biotin group and 4 PEGs. It is a versatile biotinylation reagent used for introducing a biotin moiety to azide-labeled biomolecules via copper-free strain-promoted alkyne-azide click chemistry (SPAAC) reaction. This reagent contains a DBCO group that can undergo SPAAC with molecules containing azide groups.
- Azadibenzocyclooctyne-biotin derivative
- Contains a biotin group and 4 PEGs
- Versatile biotinylation reagent
- Introduces a biotin moiety to azide-labeled biomolecules
- Uses copper-free strain-promoted alkyne-azide click chemistry (SPAAC) reaction
- DBCO group can undergo SPAAC with molecules containing azide groups
Medchemexpress LLC 3,6,9,12,15,18-hexaoxanonadecanoic acid | 16142-03-3 | MFCD30536160 | 99.9% | 310.34 | C13H26O8 | 50 MG
m-PEG5-CH2COOH is a monodisperse PEG linker terminating in a carboxylic acid, designed for use as a non-cleavable linker in antibody-drug conjugates and as a PEG-based linker in PROTAC synthesis.
- Terminal carboxylic acid (-CH2COOH) for straightforward amide coupling to amines.
- PEG5 spacer provides hydrophilicity and flexibility to linker arms.
- High reported purity (99.9%) suitable for research-grade bioconjugation.
- Monodisperse molecular weight 310.34 and formula C13H26O8 for predictable behavior.
- Available in small, research-friendly package sizes such as 50 mg.
Medchemexpress LLC DNP-PEG4-acid | 858126-76-8 | 100 MG
DNP-PEG4-acid is a PEG-based PROTAC linker designed for the synthesis of PROTACs. PROTACs are compounds that exploit the intracellular ubiquitin-proteasome system to selectively degrade target proteins, consisting of two different ligands connected by a linker: one for an E3 ubiquitin ligase and the other for the target protein.
- PEG-based PROTAC linker
- Used in the synthesis of PROTACs
- Exploits the ubiquitin-proteasome system
- Selectively degrades target proteins
- Relevant for cancer and cancer targeted therapy research
Medchemexpress LLC Amino-PEG12-Boc | 1383814-00-3 | 98.0% | C31H63NO14 | 100 MG
Amino-PEG12-Boc is a PEG-based PROTAC linker utilized in the synthesis of PROTACs. PROTACs are designed with two distinct ligands connected by a linker: one targeting an E3 ubiquitin ligase and the other for a specific target protein. This mechanism exploits the intracellular ubiquitin-proteasome system to selectively degrade target proteins.
- PEG-based PROTAC linker
- Used in the synthesis of PROTACs
- PROTACs exploit the ubiquitin-proteasome system to degrade target proteins