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Research Library
Explore our collection of research articles, guides, and protocol documentation.
Buying Guides
A certificate of analysis is usually read as a single number — the purity percentage — when it is really a panel of independent measurements, each with its own method and its own blind spot. This guide walks the document from the header block to the impurity profile: what each field measures, why chromatographic purity and net peptide content are different numbers, how the mass-balance fields account for everything in the vial that is not peptide, and what the gaps on a thin certificate tell you.
Buying Guides
The phrase "research-grade peptide" sounds authoritative, but it describes a chemical sales category — not a verified quality benchmark. This guide explains the grade framework, certificate of analysis essentials, purity standards, and what the FDA's "research use only" label actually means for buyers.