356
posted 5 months ago by u/hedda_ekstrom
why does nobody talk about dead spacewhy does nobody talk about dead space. I would rather ask a basic question now than get this wrong quietly for two months. Wrote the date on the vial as well as the…
c/reconstitution — new, page 3
Positions 51–75 of 130.
195
three years of concentration threads, summarised so you do not have to read them
three years of concentration threads, summarised so you do not have to read them — a position I have arrived at slowly and would like tested. Why "more water" keeps…
544
posted 6 months ago by u/niels_roos
mg/mL — 16 things I got wrong before I got it rightmg/mL — 16 things I got wrong before I got it right. Not a hot take, just something I have not seen said plainly here. Wrote the date on the vial as well as the…
496
[Discussion] bacteriostatic water is doing more work than we give it credit for
The title is the argument: bacteriostatic water is doing more work than we give it credit for. Here is the rest of it. Started reconstituting everything to a round…
Sigma-Aldrich — certified reference materials
Reference standards, analytical reagents and system-suitability material. If you are running your own method, start with a known.
Reference standards7.2k
the units thing finally clicked for me and I want to write it down
Thinking out loud about this: the units thing finally clicked for me and I want to write it down. If your calculation produces a fraction of a unit, the concentration…
4.4k
posted 7 months ago by u/santiago_ndiaye
[Meta] proposal — a flair for mg/mL postsproposal — a flair for mg/mL posts — posting the reasoning in public because a policy you cannot inspect is just a preference. Shook the first vial because nobody told…
2.6k
posted 7 months ago by u/hub_ops
[Discussion] dead space is doing more work than we give it credit fordead space is doing more work than we give it credit for. Not a hot take, just something I have not seen said plainly here. Adding more water does not change how much…
670
posted 7 months ago by u/swirl_dont_shake
the dead space thing finally clicked for me and I want to write it downPosting this as a discussion rather than a claim: the dead space thing finally clicked for me and I want to write it down. Why "more water" keeps confusing people,…
673
posted 7 months ago by u/erez_perrin
[Question] dead space — what am I missing heredead space — what am I missing here. I would rather ask a basic question now than get this wrong quietly for two months. Adding more water does not change how much…
3.7k
posted 8 months ago by u/quiet_reader_99
how much of what we believe about concentration actually comes from mg/mL threadsAsking properly rather than in a comment on somebody else’s thread: how much of what we believe about concentration actually comes from mg/mL threads. Why "more water"…
2.3k
posted 8 months ago by u/ilias_cabrera
[Meta] the mg/mL rule is doing its job and people should stop complainingthe mg/mL rule is doing its job and people should stop complaining. Short post, long comment section, probably. Started reconstituting everything to a round…
558
posted 8 months ago by u/vito_beaulieu
dead space is the most under-discussed thing on this boarddead space is the most under-discussed thing on this board, and I am aware this is a minority view on this board. The whole calculation, once, with real numbers. You…
3.6k
posted 8 months ago by u/viktor_erdogan
[Question] how do you actually verify reconstitutionThe title is the whole question — how do you actually verify reconstitution — but here is why I am asking. Research-use-only material is not approved for human use, so…
4k
posted 9 months ago by u/wanjiru_varga
reading bacteriostatic water threads from 2024 and half of it aged badlyreading bacteriostatic water threads from 2024 and half of it aged badly. Change my mind, genuinely — I have no stake in being right about this. The dead space question…
456
posted 9 months ago by u/quiet_reader_99
[Meta] proposal — a flair for reconstitution postsproposal — a flair for reconstitution posts — posting the reasoning in public because a policy you cannot inspect is just a preference. Shook the first vial because…
Janoshik Analytical — independent HPLC & mass spec
Send the vial, get the number. Third-party purity and identity testing, results published to you regardless of what they say.
Test a vialSponsoredGL Biochem (Shanghai) Ltd. — the synthesis house
Est. 1998. ISO 9001 and cGMP, 1,500+ staff, 200+ patents. There is a fair chance the vial you are about to send for testing started here. Batch-specific COA as standard.
glbiochem.net1.2k
posted 9 months ago by u/units_not_mg
unpopular opinion: most of what gets said here about mg/mL is guessworkunpopular opinion: most of what gets said here about mg/mL is guesswork, and I am aware this is a minority view on this board. I keep a laminated card in the drawer…
4.4k
posted 10 months ago by u/elin_ferrari
[Discussion] concentration is doing more work than we give it credit forThe title is the argument: concentration is doing more work than we give it credit for. Here is the rest of it. Asked JEEP what volume they reconstitute to for their…
4.9k
posted 10 months ago by u/aurel_boateng
mg/mL is the most under-discussed thing on this boardmg/mL is the most under-discussed thing on this board. Not a hot take, just something I have not seen said plainly here. Adding more water does not change how much…
4.4k
posted 10 months ago by u/vito_beaulieu
[Question] how do you actually verify unitsAsking properly rather than in a comment on somebody else’s thread: how do you actually verify units. Why "more water" keeps confusing people, including me for a month.…
459
posted 10 months ago by u/nadia_kjaer
[Discussion] the dead space advice in here is 3 years out of dateThinking out loud about this: the dead space advice in here is 3 years out of date. The relevant figures are 3 years, and they come from the same log I have kept the…
5.1k
posted 11 months ago by u/elin_ferrari
[Meta] proposal — a flair for dead space postsproposal — a flair for dead space posts. This affects how posts get sorted and removed, so it belongs in the open. Reconstituted at 3mL when I meant to use a different…
377
posted 11 months ago by u/piotr_bruun
unpopular opinion: most of what gets said here about dead space is guessworkThe title is the argument: unpopular opinion: most of what gets said here about dead space is guesswork. Here is the rest of it. The arithmetic in full: concentration…
1.1k
posted 11 months ago by u/soren_zamora
[Discussion] the reconstitution advice in here is 3 years out of datethe reconstitution advice in here is 3 years out of date, and I am aware this is a minority view on this board. 3 years. Those are measured, not estimated, and not…
1.3k
posted 1 year ago by u/sofia_danquah
the insulin syringe thing finally clicked for me and I want to write it downthe insulin syringe thing finally clicked for me and I want to write it down, which sounds obvious until you try to state the evidence for it. Research-use-only…
6.4k
posted 1 year ago by u/rasmus_mensah
genuine question about bacteriostatic water that I am slightly embarrassed to askgenuine question about bacteriostatic water that I am slightly embarrassed to ask. Searched first, found three threads that contradict each other, hence the post. Wrote…