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Pierce™ Iodoacetamide, Single-Use (Thermo Scientific™)

Thermo Scientific Pierce Iodoacetamide is a sulfhydryl-reactive alkylating reagent used to block reduced cysteine residues for protein characterization and peptide mapping. Alkylation with iodoacetamide after cystine reduction results in the covalent addition of a carbamidomethyl group (57.07 Da) and prevents the formation of disulfide bonds. Reducing agents added after alkylation will react with excess iodoacetamide.

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Pierce™ Iodoacetic Acid

Pierce™ Sulfhydryl Addition Kit (Thermo Scientific™)

The Thermo Scientific Pierce Sulfhydryl Addition Kit contains all necessary components to introduce free sulfhydryl groups into any primary amine-containing molecule, purify the modified molecule and quantify the added sulfhydryl groups. SATA is a short-chain (2.8 angstrom spacer arm) reagent for covalent modification of primary amines and addition of a protected yet exposable sulfhydryl group, enabling heterobifunctional crosslinking strategies.

Features of SATA:

• Adds a protected sulfhydryl that can be deprotected by hydroxylamine
• Allows long-term storage of the sulfhydryl-modified molecule
• Forms cleavable disulfide bonds with other sulfhydryl-containing molecules
• Reacts with primary amines (e.g., lysine residues proteins) to form stable amide bonds
• Preserves protein activity with its mild, non-denaturing reaction conditions

SATA (N-succinimidyl S-acetylthioacetate) adds sulfhydryl groups to proteins and other amine-containing molecules in a protected form. The modified molecule can be stored indefinitely and treated with hydroxylamine to expose the labile sulfhydryl group when needed for conjugation reactions. SATA contains an N-hydroxysuccinimide (NHS) ester, which forms a stable, covalent amide bond with primary amines (i.e., lysine residues and the amino termini of proteins) and releases NHS as a by-product. De-protection (deacylation) to generate a free sulfhydryl is accomplished using hydroxylamine-HCl.

Sulfhydryl groups present on proteins, peptides and other compounds are important in protein chemistry/modification reactions. Frequently, thiols are unavailable or absent within the molecules of interest. Several reagents and techniques are available for introducing sulfhydryl groups or disulfides into proteins and peptides, including Traut's Reagent, variants of SPDP, and variants of SATA.

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Pierce™ SATA (N-succinimidyl S-acetylthioacetate)
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Pierce™ SAT(PEG)4

Pierce™ Chloroacetamide, No-Weigh™ Format (Thermo Scientific™)

Thermo Scientific Pierce Chloroacetamide is a sulfhydryl-reactive alkylating reagent used to block reduced cysteine residues for protein characterization. Alkylation with chloroacetamide after cysteine reduction results in the covalent addition of a carbamidomethyl group (57.07 Da) and prevents the formation of disulfide bonds. Reducing agents added after alkylation will react with excess chloroacetamide.

The No-Weigh format, where small amounts of reagent are pre-weighed and packaged separately, prevents the contamination and loss of reagent reactivity over time associated with repetitive opening and closing of a single vial. The format enables use of a fresh vial of reagent each time and eliminates the hassle of weighing out small amounts of reagent.

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Pierce Iodoacetic Acid