The solubility of a given peptide varies depending on its amino acid sequence and modifications. It is difficult to know the exact solubility without a practice test, we recommend adding the peptide solubility test. By the way, if there is an exact requirement on the solvent, please kindly let us know and we can test it for you. If there is no solubility test in the order, you can refer to the recommended solvent in the COA report.