Biotin-PEG11-CH2CH2N3 is widely used in bioconjugation and labeling applications due to its unique properties. The biotin moiety allows for strong binding with avidin or streptavidin, making it valuable in affinity purification, immunoassays, and diagnostic assays. The PEG11 spacer provides flexibility and solubility, reducing steric hindrance and improving the efficiency of bioconjugation. The azide group (N3) enables click chemistry reactions, particularly with alkyne-functionalized molecules, facilitating the attachment of biotin to various biomolecules like proteins, peptides, or nucleic acids. This compound is particularly useful in developing targeted drug delivery systems, biosensors, and molecular probes for imaging and detection in biological research. Its versatility makes it a key tool in studying protein interactions, cellular processes, and biomarker identification.