Amino-PEG-Acetic Acid

H₂N-PEGn-CH₂COOH is a heterobifunctional PEG derivative featuring both amine and carboxylic acid groups, enabling dual conjugation strategies for linking diverse molecules (e.g., drugs with targeting ligands) in oriented assemblies. Its key advantages include orthogonal reactivity for sequential modifications, tunable spacer length (n), and enhanced solubility for biomolecules, though the amine group may require protection during carboxyl-directed reactions to avoid cross-reactivity.