Protein Modification Reagents
Medchemexpress LLC Mal-PEG36-NHS ester | 00-00-0 | 95.0% | C86H159N3O43 | 10MG
Mal-PEG36-NHS ester is a polyethylene glycol (PEG)-based bifunctional linker bearing a maleimide and an N-hydroxysuccinimide (NHS) activated ester. Supplied as a research-use solid, it facilitates thiol and amine conjugation for PROTAC assembly and other bioconjugation chemistries.
- Enables thiol coupling via maleimide and amine coupling via NHS ester.
- PEG36 spacer provides hydrophilicity and flexible linker length.
- High molecular weight (≈1,923 Da) for extended linker reach.
- Purity approximately 95.0% as provided by manufacturer.
- Soluble in DMSO at ~62.5 mg/mL; documented in vivo formulations exist.
- Recommended storage: -20°C for solid; low-temperature storage for solutions to preserve stability.
- Intended for research use only; not for clinical applications.
LAB ALLEY Lab Alley Polyethylene Glycol (PEG) 400 Food Grade (FCC) Halal
Polyethylene Glycol is synthesized by ring-opening polymerization of ethylene oxide. This synthesis process gives PEG a range of molecular weights and distributions from 300 grams per mole to 10000000 grams per mole. PEG 400 has a molecular weight of 400 and is a clear colorless viscous liquid. Polyethylene Glycol is colorless inert odorless and non-volatile. PEG is biocompatible (it will not damage tissues or cells) hydrophilic dissolves readily in water without changing the color odor or taste and is nontoxic. Due to the high purity of Polyethylene Glycol 400 it is certified by the United States Pharmacopeia (USP) grade and the Food Chemicals Codex (FCC) grade.
Cayman Chemical BIotIn-PEG3-azIde 25mg
A PEGylated version of biotin-azide that is more hydrophilic; can be used to label terminal alkynes via copper-catalyzed click reactions or copper-free click reactions with cyclooctynes; used to covalently tag proteins in combination with other tags
Medchemexpress LLC 4-imidazolidinehexanamide, n-(14-amino-3,6,9,12-tetraoxatetradec-1-yl)-5-methyl-2-oxo-, (4R,5S)- | 2306109-91-9 | 99.2% | C20H40N4O6 | 10MG
Amine-PEG4-Desthiobiotin is a PEG-based linker bearing a primary amine and a desthiobiotin moiety used to assemble proteolysis-targeting chimeras (PROTACs), affinity probes, and bioconjugates. The reagent supplies a hydrophilic spacer and a reactive handle to link target-binding ligands to recruiting ligands, supporting modular synthesis and downstream affinity-based workflows.
- Provides a primary amine for straightforward conjugation using standard amide-coupling chemistries.
- Contains a desthiobiotin moiety for reversible affinity capture with streptavidin-based systems.
- PEG4 spacer imparts hydrophilicity and flexible linkage between functional groups.
- High reported purity supports reproducible synthesis and analytical characterization.
- Stable when stored frozen and in solution under recommended conditions.
![eMolecules 1807518-63-3 | tert-butyl 2-[2-(2-bromoethoxy)ethoxy]acetate | AA Blocks LLC | MFCD28122957 | 283.162 | C10H19BrO4 | 0.000 | CC(C)(C)OC(=O)COCCOCCBr | 250mg | 713349126](https://assets.fishersci.com/TFS-Assets/CCG/product-images/5000191372.jpg-250.jpg)
eMolecules 1807518-63-3 | tert-butyl 2-[2-(2-bromoethoxy)ethoxy]acetate | AA Blocks LLC | MFCD28122957 | 283.162 | C10H19BrO4 | 0.000 | CC(C)(C)OC(=O)COCCOCCBr | 250mg | 713349126
tert-butyl 2-[2-(2-bromoethoxy)ethoxy]acetate | AA Blocks LLC | 1807518-63-3 | MFCD28122957 | 283.162 | C10H19BrO4 | 0.000 | CC(C)(C)OC(=O)COCCOCCBr | 250mg | 713349126
Medchemexpress LLC HY-103602A 100mg Medchemexpress, (S,R,S)-AHPC-PEG3-NH2 CAS:2010159-56-3 Purity:>98%
Medchemexpress, HY-103602A 100mg (S,R,S)-AHPC-PEG3-NH2 CAS:2010159-56-3 (S,R,S)-AHPC-PEG3-NH2 is a synthesized E3 ligase ligand-linker conjugate that incorporates the (S,R,S)-AHPC based VHL ligand and 3-unit PEG linker used in PROTAC technology. Purity:>98% Medchemexpress has over 10000 novel life-science reagents, reference compounds, APIs and natural compounds for laboratory and scientific use. Other quantity can also be offered.
Cayman Chemical H TOPK 032 1mg
An inhibitor of TOPK (IC50 = ~2 µM), Chk1 (IC50 = 9.6 µM), and MEK1 (40% inhibition at 5 µM); decreases the growth of colon cancer and glioma initiating cells in vitro and suppresses tumor growth in vivo
Sigma Aldrich Fine Chemicals Biosciences Clostridium difficile Toxi
Native toxin A purified from C. difficile strain VPI10463 (toxinotype 0)