Abstract
Thiol-reactive linkers, such as iodoacetyl or maleimide, bound to cross-linked agarose are used to attach cysteine-containing peptides covalently to this resin for use in affinity-purification protocols. It is critical to confirm that the peptide contains a reduced cysteine so that the thiol is available for conjugation to the thiol-reactive linker. The column should be sized appropriately for the amount of peptide to be used and the volume of serum to be processed. Excess binding sites on the column must be blocked with free cysteine before use.
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