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Using bacteriostatic water for peptides is widely recommended, and researchers must follow careful steps to protect peptide quality and solution safety

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M., Wilson-Delfosse, A

Incorrect peptide entirely Glu-Arg-Asp sequence isomer Asp-Glu-Arg sequence isomer Reversed amino-acid order Missing one amino-acid residue Free amino-acid contamination D-amino-acid or epimerised impurities N-terminal pyroglutamate formation Unexpected N-terminal acetylation Unexpected C-terminal amidation Aspartimide-related impurity Isoaspartate formation Peptide-bond hydrolysis Incorrect net peptide quantity Excess water Residual trifluoroacetate Undeclared acetate or other counterions Residual coupling reagents Residual organic solvents Elemental contamination Incorrect pH Microbial contamination Unverified bacterial-endotoxin control Unverified sterile quality Visible or subvisible particles Incorrect storage or warm transport Certificate unrelated to the supplied batch Raw-material certificate presented as finished-vial evidence How Pinealon Research Material Should Be Analytically Tested Intact mass alone is especially inadequate because several sequence isomers can have exactly the same formula

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