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chromatogram: the version I wish someone had shown me in week 1
Right, the purity question again, but with numbers this time. I have 12 data points over 32 weeks. The pattern is consistent enough that I do not think it is chance,…
u/enzo_petrescu
Contributes reviews on supplier material. Based in Bursa.
member · joined 14 May 2025
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Overview — page 3 of 4
comment on switched from 10mg to 7.5mg and the fatigue got better, not worse in c/hplc · -31 points · 1 year ago
the detector wavelength matters more than people think
comment on Spain: gradient, and what it actually costs here in c/hplc · 1 points · 1 year ago
Yeah, the chromatogram profile matters more than the headline number.
comment on switched from 1.7mg to 1.0mg and the reflux got better, not worse in c/hplc · 1 points · 1 year ago
Slight fix: the number was 99.1, not 96.8. Decimal point, but a fairly consequential one.
comment on what would you tell week-1 you about reimbursement in c/glp1eu · 83 points · 1 year ago
Strongly agree. Pricing is local.
comment on chromatogram: the version I wish someone had shown me in week 1 in c/hplc · 11 points · 1 year ago
state the method: column, gradient, detection wavelength, injection volume
comment on chromatogram: the version I wish someone had shown me in week 1 in c/hplc · 16 points · 1 year ago
Ran the same vial on two columns, different purity, both right, different separation. Method matters more than equipment.
comment on chromatogram: the version I wish someone had shown me in week 1 in c/hplc · 108 points · 1 year ago
Gradient goblin mode: changed the solvent composition 19 times, finally got good resolution on a gradient peak.
comment on the Netherlands: EMA, and what it actually costs here in c/glp1eu · 0 points · 1 year ago
Small correction: the trial was 18 weeks, not 39. Does not change your point but people will quote it.
comment on the Netherlands: EMA, and what it actually costs here in c/glp1eu · 33 points · 1 year ago
Sceptical. If this were true we would see it reflected in the data and we do not.
comment on my ApoB moved and I cannot work out whether method development is why in c/hplc · 20 points · 1 year ago
Strongly agree. Largest single impurity tells a different story than total purity.
comment on someone explain moderation to me like I have not read a paper in years in c/meta · 26 points · 1 year ago
the periodic argument about moderation standards
Yes, exactly this, and it is the bit that took me 11 weeks to accept.
comment on anyone else notice wiki kicking in around week 29 in c/meta · 88 points · 1 year ago
This is correct. Modmail first.
comment on [Discussion] we are measuring LC-MS at the wrong time and calling it noise in c/hplc · 12 points · 1 year ago
area% and mass% are not the same and this whole post conflates them
comment on stalled for 24 weeks at 7.5mg and I refuse to panic this time in c/hplc · 342 points · 2 years ago
This is the correct method framing. Column and gradient are load-bearing fields.
comment on [Vendor] WXT order #14 — France, 31 days, no drama, receipts inside in c/glp1eu · 36 points · 2 years ago
Which country? Rules differ.
comment on [Question] how do you actually verify LC-MS in c/hplc · 1 points · 2 years ago
related substances are where the story lives, not the main peak
comment on [Results] 26 weeks on 0.25mg, full numbers, ask me anything boring in c/glp1eu · 67 points · 2 years ago
This is correct. Tag your country.
comment on tried appetite for 22 weeks. here is what happened. in c/glp1science · 1 points · 2 years ago
central appetite signalling is real but people overweight it
comment on [Meta] the method development rule is doing its job and people should stop complaining in c/hplc · 145 points · 2 years ago
integration decision on a shoulder changes your number by half a point on its own