Understanding Peptide Purity: What 99% Does and Doesn’t Tell You
A purity figure is a chromatographic ratio, not a statement about everything in the vial. What the number measures, what it leaves out and how to read it.
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What Is HPLC and How Does It Measure Peptide Purity?
HPLC separates a peptide from its impurities on a column and reports the result as a chromatogram. Here is how it works and how to read one on a COA.
Why Third-Party Lab Testing Matters for Research Peptides
A supplier grading its own product is a conflict of interest, not a quality system. What independent testing adds, what it cannot fix, how to read it.
Mass Spectrometry: How a Peptide’s Identity Is Confirmed
Purity tells you how much of a sample is one thing. Mass spectrometry tells you what that thing is. Here is how the identity check works.
Net Peptide Content vs. Purity: Two Numbers, Two Different Questions
A vial can be 99% pure and 75% peptide by weight at the same time. Counter-ions, bound water and how amino-acid analysis resolves the difference.
How Research Peptides Are Made: Solid-Phase Peptide Synthesis Explained
How a peptide is built one amino acid at a time on a resin bead, why Merrifield's method won a Nobel Prize, and where impurities enter the process.
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