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What a COA Should Include Identity Confirmation Mass spectrometry confirming 850 Da for DSIP Sequence verification — 9-residue sequence Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu N-terminal Trp confirmed (specific UV absorption signature) Purity Testing HPLC purity at 98%+ Single dominant peak

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The Uncompromising Truth About Peptide Dilution Accuracy Here's the honest answer: most peptide researchers overestimate their ability to calculate dilution ratios mentally, and the consequences show up as unexplained protocol variability weeks later