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Acetylene-PEG4-maleimide - 3-(N-maleimidyl)-N-(3,6,9,12-tetraoxapentadec-14-yn-1-yl)propionamide - J64859 - Alfa Aesar

J64859 Acetylene-PEG4-maleimide

CAS Number

Size Price ($) Quantity Availability
25mg 105.00
100mg 225.70
500mg 840.00
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Chemical Properties

Formula Weight
Viscous liquid or solid
Soluble in water.


Heterobifunctional cross linker enabling the connection of an azide containing compound or biomolecule to one with a thiol. The maleimide group will react preferentially with thiols to form a covalent adduct and the terminal alkyne will react with azides via copper-catalyzed 1,3-dipolar cycloaddition click chemistry. The hydrophilic PEG spacer adds to the water solubility of this reagent, allowing for easy modification cysteine containing biomolecules such as antibodies, proteins and peptides with the terminal alkyne. The PEG spacer also reduces aggregation of modified proteins stored in solution by adding hydrophilic character. A bifunctional linker with sulfhydryl reactive and azide reactive groups. Contains a PEG spacer to increase solubility


Keep container tightly closed. Store away from oxidizing agents.

Literature References

Hao Jiang.; Tianqing Zheng.; Aime Lopez-Aguilar.; Lei Feng.; Felix Kopp.; Florence L. Marlow.; Peng Wu. Monitoring Dynamic Glycosylation in Vivo Using Supersensitive Click Chemistry. Bioconjugate Chem. 2014, 25, (4), 698-706.

GHS Hazard and Precautionary Statements

Hazard Statements: H315-H319-H335

Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.

Precautionary Statements: P261-P280-P305+P351+P338-P304+P340-P362-P312-P321-P405-P403+P233-P501a

Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Take off contaminated clothing and wash before reuse. Call a POISON CENTER or doctor/physician if you feel unwell. Specific treatment (see label). Store locked up. Store in a well-ventilated place. Keep container tightly closed. Dispose of contents/container in accordance with local/regional/national/international regulations.

Other References

Harmonized Tariff Code


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