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Single comment threadYou are looking at one branch of [Discussion] can we stop arguing about related substances until somebody posts a number — 34 comments in the full submission. View in context.
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c/coa·submitted 2 years ago by u/tomas_lehtinen

[Discussion] can we stop arguing about related substances until somebody posts a number

Discussionbranch of 9 comments

I have had 17 orders now and I keep a table, so here is the honest summary rather than a vibe. Material has been consistent. Communication has not. Shipping has varied by about 4 days on nominally the same lane, which matters more in summer than in February. The independent number came back 96.8% against a claimed…

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9 comments, started 2 years ago
u/halima_boateng785 points·2 years ago

redact your own name, not the vendor's batch details

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u/zaid_balogun624 points·2 years ago

redact your own name, not the vendor's batch details

Disagree on that part. 95.1% and 98.7% on the same vial is normal.

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u/teodor_jansen276 points·2 years ago

redact your own name, not the vendor's batch details

Yes, exactly this, and it is the bit that took me 87 weeks to accept.

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u/certified_referenceQC124 points·2 years ago

the related substances line is where the story is

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u/coa_collectorarchivist103 points·2 years ago

purity and net content are two different numbers, same vial

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u/tomas_lehtinenOP-5 points·2 years ago

purity and net content are two different numbers, same vial

Disagree on that part. 97.4% and 97.6% on the same vial is normal.

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[removed]189 points·2 years ago

[removed by moderator]

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u/dario_vermeulen78 points·2 years ago

axis labels included, always

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u/blunt_coldbox29323 points·2 years ago

That is net peptide content, not purity. Different number, different meaning.

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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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