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c/coa·posted 2 years ago by u/freya_baptista

help me understand water content, I have read the wiki twice

Discussion Cold Box ×3

I have had 10 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 40 days on nominally the same lane, which matters more in summer than in February.

The independent number came back 99.0% against a claimed 99.1%, which I read as agreement rather than a discrepancy — inter-lab variance on this assay is a point or two either way and treating one lab as ground truth is how people end up in pointless arguments with vendors.

Batch number is in the comments. Ask if you want the method.

422 up / 104 down80% upvoted15 commentsid 2cdhj618 Aug 2023

15 comments

10 in this archive, depth 4

best — the order this archive was captured in

u/soren_zamora42 points·2 years ago

The confident tone is doing a lot of work that the evidence is not.

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u/valeria_karlsen33 points·2 years ago

no "is this good?" without saying what the compound and claimed purity are

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[removed]31 points·2 years ago

[removed by moderator]

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u/aleksi_eriksen29 points·2 years ago·edited

Water content on the document? That affects your concentration math.

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u/elodie_yilmaz-4 points·2 years ago

purity and net content are two different numbers, same vial

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u/freya_baptista1 point·2 years ago

the batch number or it did not happen

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u/ismael_eriksen22 points·2 years ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

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u/tove_ogunleye16 points·2 years ago

the counterion is part of the mass you paid for

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u/emil_agyeman14 points·2 years ago

The practical rule people converge on is 28 days at fridge temperature after first puncture, and that comes from the preservative, not the peptide.

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u/freya_baptistaOP5 points·2 years ago

The chromatogram trace is where the real information lives. The summary number is just a headline.

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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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