Fluorescein-PEG8-NHS ester is a hydrophilic fluorophore containing a NHS ester group and a hydrophilic PEG spacer arm. The NHS ester can react specifically and efficiently with primary amines such as the side chain of lysine residue or aminosilane-coated surfaces at neutral or slight basic conditions to form a covalent bond. The hydrophilic PEG spacer arm increases water solubility and conjugation efficiency. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
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