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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

The study was conducted by Radiant Research Services Pvt

PloS One (2016) 11(11):e0167247