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Catalog No.
Sulfhydryl-reactive biotinylation reagent, pyridyldithiol-activated
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10mM (in 1mL DMSO)
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In stock
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In stock

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Biotin-HPDP (N-[6-(biotinamido)hexyl]-3’-(2’-pyridyldithio)propionamide), a sulfhydryl-reactive biotinylation agent, is  a water-insoluble reagent that requires the dissolution of suitable solvents, including dimethyl sulfoxide (DMSO) and dimethylformamide (DMF),  prior to the addition into aqueous reactions. Biotin-HPDP consists of a bicyclic biotin rings structure, a 1,6-diaminohexane spacer group attached to the valeric acid side chain of biotin and a sulfhydryl-reactive group at the end of the spacer. The pyridyl disulfide group at the end of biotin-HPDP is able to react with free thiol groups on proteins and other molecules forming a disulfide bond and releasing pyridine-2-thione. The long spacer arm of biotin-HPDP enables the modified molecule to better bind to the avidin or streptavidin probes.


Bioconjugate Techniques , 2nd ed. By Greg T.Hermanson  (Pierce Biotechnology, Thermo Fisher Scientific, Rockford, IL).  Academic Press  (an imprint of Elsevier):  London, Amsterdam, Burlington, San Diego . 2008. ISBN 978-0-12-370501-3.

Product Citation


• Protein labeling—biotinylate antibodies or other proteins for use in protein methods
• Thiol-reactive—reacts with sulfhydryls (-SH), such as the side-chain of cysteine (C)
• Pyridyldithiol-activated—perform reactions at pH 6.5 to 7.5 in buffers such as PBS
• Reversible—forms disulfide bonds, which can be cleaved using DTT or other reducing agent
• Solubility—water insoluble, must be dissolved in DMSO or DMF before further dilution in aqueous buffers
• Medium length—spacer arm is 29.2 angstroms

Chemical Properties

Physical AppearanceA solid
StorageStore at -20°C
Cas No.129179-83-5
Solubilityinsoluble in H2O; ≥101.4 mg/mL in DMSO; ≥8.29 mg/mL in EtOH with ultrasonic
Chemical Name5-[(3aS,4S,6aR)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-N-[6-[3-(pyridin-2-yldisulfanyl)propanoylamino]hexyl]pentanamide
SDFDownload SDF
Shipping ConditionShip with blue ice, or upon other requests.
General tipsFor obtaining a higher solubility, please warm the tube at 37°C and shake it in the ultrasonic bath for a while. We do not recommend long-term storage for the solution, please use it up soon.


Biotinylation method [1]:


S-nitrosylated proteins

Preparation method

Soluble in DMSO or DMF.

Reaction Conditions

50mM, 25 ℃ for 1 h


Prepare biotin-HPDP as a 50mM suspension in DMSO, Dilute with DMF to a final concentration of 4 mM. Add 1:3 volume of Labeling Solution and 1:50 volume of Ascorbate Solution(50mM) to the blocked protein samples, incubate for 1 hour at 25°C. After that, add two volumes of −20°C acetone and incubate for 20 min at −20°C to remove the biotin-HPDP. At last, Add 15 µl of packed streptavidin-agarose per mg of protein used in the initial protein sample, to purify biotinylated proteins. Incubate the biotinylated proteins with the resin for 1 hour at room temperature. Wash the beads five times with 10 volumes of Neutralization Buffer + NaCl. Centrifuge at 200g for 5 s at room temperature between each wash. Incubate the beads with Elution Buffer to recover the bound proteins. To test for the protein of interest with specific antibodies in SDS-PAGE.


[1].Samie R. Jaffrey and Solomon H. Snyder. The Biotin Switch Method for the Detection of S-Nitrosylated Proteins. Science’s stke.2015.

Biological Activity

Description Biotin-HPDP is a sulfhydryl-reactive biotinylation agent.

Quality Control