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Single comment threadYou are looking at one branch of [Vendor] GGPeps vs GL Biochem on the same compound, same month — both cleared 99.0% — 46 comments in the full submission. View in context.
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c/coa·submitted 5 months ago by u/soren_nkemelu

[Vendor] GGPeps vs GL Biochem on the same compound, same month — both cleared 99.0%

Explainerbranch of 6 comments

Posting this because the title is the whole finding — GGPeps vs GL Biochem on the same compound, same month — both cleared 99.0% — and a number without its method is a rumour. The numbers the title promised, since a headline without them is worthless: 99.0%. Everything below is context for those. Area percent is the…

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6 comments, started 5 months ago
u/karma_irrelevant170 points·5 months ago

Water content 3.8%, acetate 6.2%, purity 99%, net peptide about 90% of label weight. All four numbers honest, and I had to read it twice.

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u/low_appetite_lisa68 points·5 months ago

Pushing back a little: a missing field is usually presentation, not concealment. Ask for the full document before drawing conclusions.

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u/karma_irrelevant56 points·5 months ago

net peptide content and purity are two different numbers on the same vial

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u/sofia_danquah32 points·5 months ago·edited

Pushing back a little: a missing field is usually presentation, not concealment.

low_appetite_lisa has the distinction right — one is a fraction of the detector signal, the other is a fraction of the mass.

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u/laila_wojcik26 points·5 months ago

Asked for the storage condition behind the stability statement. Got it in a sentence. It is a two-line email and almost nobody sends it.

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u/anya_moreau100 points·5 months ago

Ask what the stability statement was written against — temperature, light, and whether it was the lyophilised powder or the reconstituted solution. Those are three different claims.

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How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.

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