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What a COA (Certificate of Analysis) Should Include Identity Confirmation Mass spectrometry confirming the 9,111 Da molecular weight (70 amino acids total with the N-terminal extension) Amino acid sequence verification matching the LR3 modification (Arg at position 3, MFPAMPLSSLFVN extension) Purity Testing HPLC purity look for 98%+ purity The chromatogram should show a single dominant peak with minimal truncated-sequence or oxidized impurities Contamination Testing Endotoxin levels (critical this is injected intramuscular or subcutaneous) Residual solvent analysis Heavy metals screening Protein-Specific Tests (rare but ideal) Circular dichroism (CD) spectroscopy confirming secondary structure Bioactivity assay on MCF-7 or similar IGF-1-responsive cell line Most vendors skip the last category

Expert Opin Biol Ther 2008;8:195562

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Hence, intracellular proteins usually do not contain disulfides, which are abundant in extracellular proteins (such as those found in blood) or in certain organelles, such as the endoplasmic reticulum and mitochondrial intermembrane space, where disulfides can be introduced