NH2-PEG-COOH, MW 5k
NH2-PEG-COOH is a linear heterobifunctional PEGylation reagent with one amine and one carboxylic acid group. It is a useful crosslinking reagent with a bifunctional PEG spacer. Typically, it is available as its HCl or TFA salt.
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. Mundt, N.A., 2017. Functionalization of Indium-Based Quantum Dots for Use as a Non-Viral Gene Therapy Vector. Text.
2. Enrichment and Quantification of Epitope-specific CD4+ T Lymphocytes using Ferromagnetic Iron-gold and Nickel Nanowires. Scientific Reports. 2018 Oct 24;8(1):15696. Text.
3. Combining Doxorubicin-Loaded Pegylated Poly(Lactide-Co-Glycolide) Nanoparticles with Checkpoint Inhibition Safely Enhances Therapeutic Efficacy in a Melanoma Model, ACS Biomater. Sci. Eng. 2019, doi: 10.1021/acsbiomaterials.9b01108
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