Product nameGold-Maleimide Conjugation Kit (40nm, 20 OD)
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Gold-Maleimide Conjugation Kit (40nm, 20 OD) (ab188290) allows thiolated molecules (e.g. antibodies, Fab’ fragments, or other sulfhydryl-containing biomolecules) to be covalently attached to ultra-stable Gold nanoparticles at high OD, quickly and easily. The conjugation reaction is initiated by adding a solution of the thiol-activated molecule to the Gold-Maleimide nanoparticles. The hands-on time for the procedure is about 5 minutes and the conjugate is ready to use within 1 hour.
The Gold nanoparticles that come with the kit have a proprietary protective coating that shields the biomolecule from the metal surface, thus eliminating metal-antibody interactions and reducing the risk of sub-optimal antibody performance, such as loss of affinity or denaturation. Moreover, the covalently attached molecule is not prone to dissociation which is a major problem with direct thiol-to-gold metal conjugations.
Benefits of Gold-Maleimide Conjugation Kit (40nm, 20 OD):
Easy protocol – conjugate ready to use in 1 hour, with only 5 minutes hands-on time
Oriented labelling for oligonucleotides and Fab’ fragments
Proprietary surface coating prevents metal-protein interactions, and enables covalent attachment to the gold – stable conjugates formed
Uniform spherical shape and narrow size distribution – consistent high quality and batch to batch reproducibility
The biomolecule to be conjugated should ideally be in PBS, MOPS or HEPES buffer. Free thiols (e.g. β-mercaptoethanol, DTT) must be excluded from samples and maleimide reaction buffers by desalting, because they will compete for coupling sites on the gold nanoparticles. A desalting step post reduction is mandatory if thiols are used to reduce the disulphide bonds.
For incompatible buffers and low antibody concentrations, use our rapid antibody purification and concentration kits for Nanoparticles. To learn more about incompatible buffers, please refer to the protocol booklet.
This product is manufactured by Expedeon, an Abcam company, and was previously called 40nm InnovaCoat® GOLD - Maleimide. 270-0015 is the same as the 1 x 25 µg size. 270-0005 is the same as the 3 x 2.5 µg size.
1 test kit (contains 1x bulk vial), 3 test kit (contains 3x mini vials)
Storage instructionsStore at -20°C. Please refer to protocols.
Components 3 x 2.5 µg 1 x 25 µg ab273973 - Diluent reagent 1 x 1500µl 1 x 1500µl ab273976 - Gold Particles For Oligo Conjugation 3 x 2500ng 1 x 25µg ab273974 - Quencher reagent 1 vial 1 vial ab273975 - Reaction Buffer 1 x 200µl 1 x 200µl
Lateral flow assay demonstrates increased performance of orientated Fab’ conjugation with the Gold-Maleimide Conjugation Kits compared to random labelling with the Gold Conjugation Kits. All components of the lateral flow assay are identical with the exception of the method used to conjugate the Fab’ with the Gold-Maleimide kits or Gold Conjugation Kits. Fab’ fragments were derived from the same antibody (Goat anti-Rabbit, polyclonal). The analyte is a Rabbit IgG, and the Capture antibody on the T-line is Goat anti-Rabbit, polyclonal.
ab188290 has been referenced in 1 publication.
- Chuerduangphui J et al. Peroxiredoxin 2 is highly expressed in human oral squamous cell carcinoma cells and is upregulated by human papillomavirus oncoproteins and arecoline, promoting proliferation. PLoS One 15:e0242465 (2020). PubMed: 33332365