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c/coa·submitted 3 months ago by u/kavya_verhoeven

[Meta] proposal — a flair for water content posts

Questionbranch of 9 comments

proposal — a flair for water content posts. Nothing about this affects the ranking maths, before anyone asks. 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. Related substances…

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9 comments, started 3 months ago
u/sunday_shot_sal180 points·3 months ago

My first certificate had a compound name, a percentage and a logo. I thought that was normal. It is not, and now I know what to ask for.

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u/purity_pedantMOD124 points·3 months ago

Removed — cropped document. Post the whole page or do not post it; the fields people crop are the fields that matter.

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u/kavya_verhoevenOP95 points·3 months ago

Removed — cropped document.

Disagree on this specific point. Two honest labs can resolve that impurity differently and report different numbers.

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u/kavya_verhoevenOP67 points·3 months ago

the related substances line is where the story is

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u/dead_space_doug49 points·3 months ago

Sent one vial to PeptideMeter and Medutest. 99.1% and a claimed 99.0%. Cost me more than the vial and I would do it again.

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u/coa_janitormod · c/coa31 points·3 months ago

identity and quantity are two questions and most documents answer one

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u/reflux_report40 points·3 months ago

post the whole document, not the headline number

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u/amira_dumitru27 points·3 months ago

Correction: that is net peptide content, not purity. Different number, different meaning, and the document says so if you read the row label.

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u/amara_halonen64 points·3 months ago

Agreed on asking for the storage condition. It is one line and it changes how you read the entire stability claim.

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About c/coa

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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