Protein Modification Reagents
Medchemexpress LLC PC-biotin-PEG4-NHS carbonate | 2055198-03-1 | 97.0% | C35H50N6O14S | 10MG
PC-Biotin-PEG4-NHS carbonate is a PEG-based photocleavable biotinylation reagent bearing an NHS carbonate amine-reactive group. It is designed for use as a PROTAC linker or to introduce a light-cleavable biotin tag for biochemical conjugation, affinity capture, and downstream light-mediated release of labeled molecules.
- Photocleavable biotin enables light-controlled release of captured molecules.
- PEG4 spacer improves solubility and reduces steric hindrance in conjugates.
- NHS carbonate reacts with primary amines to form stable carbamate linkages.
- High reported purity supports use in synthesis and analytical workflows.
- Powder storage at -20°C and cold-solvent storage extend compound stability.
Medchemexpress LLC Mal-PEG4-propargyl | 1262681-30-0 | MFCD29041878 | 99.7% | C15H21NO6 | 10MG
Mal-PEG4-propargyl is a bifunctional PEG4 linker bearing a maleimide and a propargyl (alkyne) group. It is designed for use in bioconjugation and linker assembly, enabling thiol-maleimide coupling and copper-catalyzed azide-alkyne cycloaddition (CuAAC) to attach diverse ligands or linkers.
- Maleimide group enables rapid, selective thiol conjugation.
- Propargyl (alkyne) group supports CuAAC "click" reactions.
- PEG4 spacer improves solubility and reduces steric hindrance.
- Low molecular weight (311.33 g·mol⁻¹) for minimal steric impact.
- High supplied purity (99.7%) for reliable synthetic performance.
Broadpharm ENDO-BCN-PEG12-NHS ESTER 98% CAS#2183440-26-6
ENDO-BCN-PEG12-NHS ESTER 98% CAS#2183440-26-6
![eMolecules 957486-82-7 | N3-PEG6-CH2CH2NH2 | Acrotein ChemBio Inc. | MFCD03453240 | 350.416 | C14H30N4O6 | 97.000 | NCCOCCOCCOCCOCCOCCOCCN=[N+]=[N-] | 0.5g | 487536598](https://assets.fishersci.com/TFS-Assets/CCG/product-images/5000473261.jpg-250.jpg)
eMolecules 957486-82-7 | N3-PEG6-CH2CH2NH2 | Acrotein ChemBio Inc. | MFCD03453240 | 350.416 | C14H30N4O6 | 97.000 | NCCOCCOCCOCCOCCOCCOCCN=[N+]=[N-] | 0.5g | 487536598
N3-PEG6-CH2CH2NH2 | Acrotein ChemBio Inc. | 957486-82-7 | MFCD03453240 | 350.416 | C14H30N4O6 | 97.000 | NCCOCCOCCOCCOCCOCCOCCN=[N+]=[N-] | 0.5g | 487536598
Medchemexpress LLC Dibenzocyclooctyne-s-s-peg3-biotin | 1430408-09-5 | MFCD28334542 | 96.9% | C42H56N6O8S3 | 10MG
DBCO-S-S-PEG3-biotin is a cleavable, PEG-based linker bearing a DBCO moiety for strain-promoted alkyne-azide cycloaddition. It enables copper-free click conjugation of biotin to azide-containing biomolecules and functions as a disulfide-cleavable linker for applications such as affinity enrichment and PROTAC synthesis. The material is supplied as a solid and is stored under inert atmosphere for stability.
- Cleavable disulfide linker for controlled release
- Compatible with copper-free click chemistry (SPAAC)
- High purity: 96.9%
- Soluble in DMSO at 100 mg/mL (requires ultrasonic)
- Suitable for bioconjugation, affinity enrichment, and linker synthesis