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Analysis & handling

Reference material on how research peptides are analyzed, documented and stored. What a certificate establishes, what each assay can and cannot show, and what governs stability in storage.

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How to read a certificate of analysis

A certificate records measurements made on one batch. Here is what each measurement establishes, what it cannot establish, and which absences are worth noticing.

Updated Aug 13, 2026Read the article →

Analysis & documentation

8 articles

Analysis & documentation
HPLC vs mass spectrometry: what each test proves
The two methods on almost every certificate answer different questions. Neither substitutes for the other, and a certificate carrying only one has answered half of what you asked.
Updated Aug 13, 2026Read →
Analysis & documentation
Net peptide content vs purity: two numbers, two denominators
The same vial can honestly report 99% purity and 78% peptide by mass. The two figures are not in conflict — they are answering different questions.
Updated Aug 13, 2026Read →
Analysis & documentation
Endotoxin and sterility: two questions, often confused
A sterile sample can carry a high endotoxin figure, and the two tests are not substitutes. What each one establishes, and why the distinction catches people out.
Updated Aug 13, 2026Read →
Analysis & documentation
Heavy metal screening: what chromatography cannot see
A purity figure cannot show elemental residues, because they do not behave like chromatographic peaks. A separate instrument answers a separate question.
Updated Aug 13, 2026Read →
Analysis & documentation
What "research use only" means on a vial
The designation describes the scope a supplier sells within, and the documentation that scope requires. It is a narrower and more specific term than it is usually treated as.
Updated Aug 13, 2026Read →
Analysis & documentation
Water content, and why Karl Fischer is the method
Residual moisture is mass that is not peptide, and it is the main thing that decides how long material keeps. One method measures it specifically; the common alternative only approximates it.
Updated Aug 13, 2026Read →
Analysis & documentation
TFA and acetate: what the counterion changes
Almost every synthetic peptide arrives as a salt. Which salt is rarely stated, contributes real mass, and matters in more experimental contexts than its obscurity suggests.
Updated Aug 13, 2026Read →
Analysis & documentation
Red flags when evaluating a peptide supplier
Every supplier in this category uses the same handful of reassuring words. What varies, and what is actually checkable, is the evidence behind them.
Updated Aug 19, 2026Read →

Handling & stability

5 articles

Concepts

2 articles

Compound reference

One page per compound

Classification, the research areas published work covers, and the documentation research-scope material should carry. These describe where the literature sits, not what it concluded.

Browse 14 compounds

These pages cover analytical chemistry, documentation and material stability. All products are supplied for laboratory research use only.

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Analysis & handling

How to read a certificate of analysis

Analysis & documentation

HPLC vs mass spectrometry: what each test proves

Net peptide content vs purity: two numbers, two denominators

Endotoxin and sterility: two questions, often confused

Heavy metal screening: what chromatography cannot see

What "research use only" means on a vial

Water content, and why Karl Fischer is the method

TFA and acetate: what the counterion changes

Red flags when evaluating a peptide supplier

Handling & stability

Why peptides ship freeze-dried

How peptides degrade: the routes that matter

Storage temperature and what shelf life actually means

Cold chain and transit: what a shipment goes through

Light, oxygen and the container itself

Concepts

What a peptide actually is

Tesamorelin vs Ipamorelin: what actually differs

One page per compound

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