Understanding Peptide Purity vs Identity Testing
Purity and identity are two different questions answered by two different instruments. What each measurement covers, and why a high number in one column says nothing about the other.
Read article →PUSH. EXCEL. PREVAIL.
PepX Research Blog
Research Education. Testing. Quality.
Educational resources on research compounds, analytical testing, quality standards and updates from PepX Research. Written for a better informed research community.
What HPLC Testing Measures in Research Compounds
How reversed-phase HPLC separates a sample, what the area percentage on a certificate is actually measuring, and which method details change the number.
Read article →What Mass Spectrometry Is Used For in Compound Identification
How a mass spectrometer measures mass-to-charge ratio, why peptides show up in several charge states, and what a mass match on a certificate establishes.
Read article →What Third-Party Testing Actually Means
Third-party testing describes who performed an analysis, not what the result proves. What independence adds, what accreditation covers, and the claims the term is often mistaken for.
Read article →Understanding Batch Numbers and Research Compound Documentation
A certificate describes one batch, not a product line. How batches and lots are defined, what a batch identifier is for, and why a document without a matching number describes something else.
Read article →What Does Lyophilized Mean?
Lyophilization is freeze-drying, a process that removes water by sublimation under vacuum. What the three stages involve, and what the word on a label tells you.
Read article →How to Read a Certificate of Analysis (COA)
A breakdown of common COA terminology, the analytical methods a certificate reports, and what each section of the document tells you about a research compound.
Read article →Looking for product information instead? Browse the full catalogue or view the published certificates of analysis.