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Regulatory
GLP-1 Compounding & the 503B Bulks List
FDA's proposed permanent exclusion of semaglutide — what it means for your supply chain.
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🧪HPLC & Chromatography
The Complete Guide to HPLC Purity Testing
How chromatography separates compounds, what the numbers on your CoA mean, and how to identify fraudulent purity claims — the full analytical picture.
⏱ 12 min read📚 Deep Dive
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Mass Spec
Why ESI-MS Identity Confirmation is Non-Negotiable
A peptide can be 99% pure and still be the wrong molecule entirely.
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Science
98% Pure — So What Is the Other 2%?
Deletion sequences, oxidized residues, residual coupling reagents explained.
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Safety
Sterility & Endotoxin: The Layer Most Vendors Skip
Invisible to HPLC and MS — but causes serious biological harm at nanogram quantities.
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HPLC
The Complete Guide to HPLC Purity Testing
How chromatography works, what the numbers mean, and how to spot fraudulent purity claims.
Read article →⏱ 12 min
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Mass Spec
ESI-MS Identity Confirmation: Why Purity Alone Is Not Enough
A peptide can be 99% pure and still be the wrong compound. Only mass spec confirms molecular identity.
Read article →⏱ 7 min
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Safety
Sterility & Endotoxin: The Safety Layer Most Vendors Skip
Microbial contamination and bacterial endotoxins are invisible to HPLC and MS — yet cause serious harm.
Read article →⏱ 8 min
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CoA
How to Read a Certificate of Analysis
Retention times, peak areas, baseline noise — every number on your CoA explained in plain English.
Read article →⏱ 8 min
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HPLC
Purity vs. Content: The Distinction That Changes Your Dosing
A peptide at 100% HPLC purity may be only 70–85% actual peptide by mass. TFA is invisible.
Read article →⏱ 5 min
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Regulatory
What GLP-Compliant Testing Actually Means
GLP compliance is not just a badge — it is a specific, auditable quality system with defined requirements.
Read article →⏱ 6 min
⚖️
Regulatory
GLP-1 Compounding & the 503B Bulks List
The FDA proposed permanently excluding semaglutide and tirzepatide from bulk compounding. What this means.
Read article →⏱ 6 min
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Buyer's Guide
Amino Acid Analysis: Confirming Composition Beyond Sequence
Quantifying the actual building blocks — catching substitutions that HPLC and MS can miss.
Read article →⏱ 7 min
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Science
98% Pure — So What Is the Other 2%?
Deletion sequences, oxidized side chains, residual coupling agents. What peptide impurities actually are.
Read article →⏱ 9 min
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PDF Guide
Sample Submission Guidelines
Packaging requirements, volume minimums, labeling standards, and shipping instructions.
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Technical Sheet
HPLC & ESI-MS Analytical Method Sheets
Method parameters, instrument specs, detection limits, and ICH compliance details.
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Sample Document
Certificate of Analysis — Example Report
See what a complete signed Apollo Analytical CoA looks like before you order.
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Technical Guide
Peptide Storage & Stability Guide
Temperature, light, moisture, and reconstitution best practices to preserve analytical integrity.
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Compliance Checklist
GLP Laboratory Quality Checklist
Audit-ready SOP framework, documentation requirements, and quality system essentials.
Resource Intelligence
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01Purity vs. Content: The Distinction That Changes Your Dosing Hot
02The Complete Guide to HPLC Purity Testing
03How to Read a Certificate of Analysis
04GLP-1 Compounding & the 503B Bulks List Hot
05Sterility & Endotoxin Testing
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