Biotin-PEG2-acid is a PEG2 linker with a biotin group and terminal acid for avidin/streptavidin binding and amide coupling. Its short hydrophilic spacer makes it especially valuable for bioconjugation, labeling, and targeted delivery.
Polyethylene Glycol PEG Linkers > Biotin PEG > Biotin acid PEG
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