Thermo Scientific™

EZ-Link™ NHS-SS-Biotin

Catalog number: 21441
Thermo Scientific™

EZ-Link™ NHS-SS-Biotin

Catalog number: 21441
Catalog Number
Unit Size
50 mg
Price (USD)
Price: 348.00
Your Price:
Catalog NumberUnit SizePrice (USD)AvailabilityQuantity
2144150 mg
Price: 348.00
Your Price:
Product Overview
Citations & References
Additional Information
Thermo Scientific EZ-Link NHS-SS-Biotin enables simple and efficient biotinylation of antibodies, proteins and other primary amine-containing molecules, as well as intracellular labeling.

Features of EZ-Link NHS-SS-Biotin:

Protein labeling—biotinylate antibodies or other proteins for detection or purification using streptavidin probes or resins
Membrane-permeable—can be used to label inside cells (intracellular)
Amine-reactive—reacts with primary amines (-NH2), such as the side-chain of lysines (K) or the amino-termini of polypeptides
Cleavable—disulfide bond in spacer arm allows the biotin label to be removed using reducing agents such as DTT; only a small sulfhydryl group remains attached to the molecule
Solubility—must be dissolved in DMSO or DMF before further dilution in aqueous buffers
Medium length—spacer arm (total length added to target) is 24.3 angstroms; it consists of the native biotin valeric acid group extended by a 7-atom chain

NHS-SS-Biotin is succinimidyl 2-(biotinamido)-ethyl-1,3' -dithiopropionate, a compound that enables simple and efficient biotinylation of antibodies, proteins and other primary amine-containing molecules. The extended spacer arm (24.3 angstroms) of this reagent reduces steric hindrance associated with binding to avidin or other biotin-binding proteins and incorporates a reducing agent-cleavable disulfide bond (-S-S-) within the spacer, providing further versatility to the reagent.

We manufacture biotin reagents to ensure the highest possible overall product integrity, consistency and performance for the intended research applications.

N-Hydroxysulfosuccinimide (NHS) esters of biotin are the most popular type of biotinylation reagent. NHS-activated biotins react efficiently with primary amino groups (-NH2) in alkaline buffers to form stable amide bonds. Proteins (e.g., antibodies) typically have several primary amines that are available as targets for labeling, including the side chain of lysine (K) residues and the N-terminus of each polypeptide.

Varieties of biotin NHS-ester reagents differ in length, solubility, cell permeability and cleavability. Non-sulfonated NHS-biotins are cell permeable but must be dissolved in organic solvent such as DMSO or DMF. Sulfo-NHS biotins (and those with pegylated spacers) are directly water soluble but not membrane permeable. Varieties containing disulfide bonds can be cleaved using reducing agents, enabling the biotin group to be disconnected from the labeled protein.
For Research Use Only. Not for use in diagnostic procedures.


Product Type
50 mg
Product Line
Cell Permeability
Chemical Reactivity
Reactive Moiety
Active Ester, Succinimidyl Ester, NHS Ester
DMF (Dimethylformamide), DMSO (Dimethylsulfoxide)
Label or Dye
Label Type
Biotin & Analogs
Mid-Length, Cleavable

Contents & Storage

Store at -20°C. Shipped at ambient temperature.