Can you also tell me how do you generally purify your peptides so that I know what kind of impurities I am expecting? September 11, 2019 12:05 Updated The impurities are most likely salts, water, solvents, TFA, and deletion, truncation or incompletely deprotected sequences. Related articles What is peptide purity? Could you please tell me the % purity that "crude" represents? What purification methods do you have in house? In what direction are the peptides synthesized? What methods do you use to purify the peptide?