Service Offer

N-terminal sequencing: Edman’s approach

<strong>Fig 1.</strong> HPLC elution profile of a standard mixture of 19 adducted amino-acids providing standard retention times. Several by-products, indicated by an X, are formed during the Edman degradation process.<br/>Click on figure to enlarge

This procedure involves the sequential (i) chemical modification of the N-terminal residue, through its amino group with phenylisothiocyanate (PITC), (ii) removal of NH2-derivatized amino-acids from the N-terminal, and (iii) reverse phase HPLC analysis with UV detection at 270 nm. 

Comparison of the successive elution profile to that of a standard set of adducted amino-acids allows for sequence calls (Fig.1).