The purity percentage of AmbioPharm’s custom peptides is set by our partner’s specification. Typically, many researchers choose >95% by RP-HPLC. This means that 95% of the NET PEPTIDE content (but not the total peptide content, see question #15) of the lyophilized powder shipped to you is composed of your target peptide. The other 5% of the PEPTIDE material in your sample is usually composed of the deletion and/or addition sequences [EG1] that sometimes co-elute with the target peptide. These deletion and addition sequences are generated during peptide synthesis due to the inefficiencies of coupling certain amino acids ((typically β-branched residues (Ile, Val
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