Thermo Scientific™

EZ-Link™ NHS-LC-LC-Biotin

Catalog number: 21343
Thermo Scientific™

EZ-Link™ NHS-LC-LC-Biotin

Catalog number: 21343
Catalog Number
Unit Size
50 mg
Price (USD)
Catalog NumberUnit SizePrice (USD)AvailabilityQuantity
2134350 mg
Product Overview
Citations & References
Additional Information
Thermo Scientific EZ-Link NHS-LC-LC-Biotin is a doubly long-chain, NHS-ester activated biotinylation reagent for labeling primary amines (e.g., protein lysines), whose membrane permeability enables it to be used for intracellular labeling.

Features of EZ-Link NHS-LC-LC-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
Irreversible—forms permanent amide bonds; spacer arm cannot be cleaved
Solubility—must be dissolved in DMSO or DMF before further dilution in aqueous buffers
Long reach—spacer arm (total length added to target) is 30.5 angstroms; it consists of the biotin valeric acid group extended by a 13-atom chain

NHS-LC-LC-Biotin is succinimidyl-6-(biotinamido)-6-hexanamido hexanoate. It is the longest of three EZ-Link NHS-Biotin Reagents that enable simple and efficient biotinylation of antibodies, proteins and any other primary amine-containing biomolecules in solution. Differing only in their spacer arm lengths, the three NHS-ester reagents offer researchers the possibility of optimizing labeling and detection experiments where steric hindrance of biotin binding is an important factor. Because they are uncharged and contain simple alkyl-chain spacer arms, these biotin compounds are membrane-permeable and useful for intracellular labeling.

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

Contents & Storage

Store desiccated at 4°C. Shipped at ambient temperature.


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