Pyrene-PEG-COOH is one of the many PEGylated pyrene derivatives for surface functionalization of carbon nanotubes and graphene. The strong (close to irreversible) pi-pi stacking between pyrene and the aromatic rings on single wall and multi-walled carbon nanotubes. Pyrene conjugation to PEG is through a very stable amide bond. It is a very simple process to prepare pyrene coated carbon nanoparticles (such as CNT). It requires just well dispersing CNTs with the PEG-pyrene reagents in either organic solvents or aqueous solutions. The same PEGylated pyrene reagent also works for graphene or any carbon nanoparticle surfaces with curvatures that fit well with the pyrene structure.
The carboxylic acid group on the distal terminal of PEG can be useful for conjugation of proteins, peptides, nucleic acid, and dye molecules to CNT surface. Custom synthesis of functional Pyrene-PEG derivatives is also available including: Pyrene-PEG-Pyrene, Amine-PEG-Pyrene, Acrylate-PEG-Pyrene, FITC-PEG-Pyrene, Rhodamine-PEG-Pyrene, Maleimide-PEG-Pyrene etc. MW options include 2k, 3.4k, 5k and 10k.
Molecular weight: MW of PEG was measured by MALDI-MS or GPC. PDI (polydispersity index) of our linear PEG is 1.02-1.05 with very narrow MW distribution. The number of repeating ethylene oxide units (CH2CH2O) or the degree of polymerization is calculated dividing the PEG MW by 44 (44 is the molecular mass of one repeating unit).
Solubility: Soluble in water and aqueous buffer, chloroform, methylene chloride, DMF, DMSO, and less soluble in alcohol, toluene. Not soluble in ether.
Density: PEG density is approximately 1.125 g/mL
Physical form: PEG products generally appear as white or off-white powder, and for very low MW linear PEG such as MW 1k or less, it may appear as wax-like, semi-solid material due to the low MW and the type of functional groups.
Storage condition: PEG product shall be stored in the original form as received in a freezer at -20C or lower for long term storage. Stock solution of PEG reagents that do not contain oxygen or moisture sensitive functional groups may be temporarily stored in a refrigerator or ambient temperature for multiple days. Stock solution should avoid repeated freeze-and-thaw cycles. See Documents section for detailed storage and handling conditions.
1) Effect of hydrophobic interaction in the poly(methacrylic acid)/pyrene end-labeled poly(ethylene glycol) complex, Macromolecules, 1987, 20 (8), pp 1839, Text.
2) Biotin-pyrene conjugates with poly(ethylene glycol) spacers are convenient fluorescent probes for avidin and streptavidin, Bioconjug Chem. 1997 Jul-Aug;8(4):560-6, Text.
3) Non-covalent and reversible functionalization of carbon nanotubes, Beilstein J. Nanotechnol. 2014, 5, 1675-1690, Text.
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