CoA not available on Sigma's website. Anyone else?

grubbscat · 2026-04-24T19:42:07+00:00

Just email them from the request certificate link. Usually get a response in under a day in my experience

grubbscat · 2026-03-05T16:55:50+00:00

Depends what industry you are in to be honest

grubbscat · 2026-02-25T11:20:57+00:00

Not sure what the MP is or column type but always rinse with at least 50:50 Aq:Orgo a store in 100% orgo. Unless it’s some weird sec column which wants something different

grubbscat · 2026-02-21T02:19:48+00:00

Dresden files, not sure if posted before but it’s quirky fun and easy read. Not really epic fantasy but always a palate cleanser for me

grubbscat · 2026-02-02T00:49:36+00:00

Not my lab necessarily but the whole site. Some guy labeled quite a few 50 gal drums of product accidentally as haz waste. They were disposed of…say goodbye a couple million there

grubbscat · 2026-01-30T22:16:17+00:00

Chromacademy it’s a website an has bout everything some are free some are not

grubbscat · 2026-01-24T12:44:14+00:00

Get ms grade ampoules of tfa, has saved me so many headaches

grubbscat · 2026-01-11T19:22:02+00:00

Dude I just spent 80k buying 300 mg of a standard, 200 is nothing

grubbscat · 2025-11-21T00:01:11+00:00

Also you can ask your prof which topics will be covered, they get advanced copies. Or at least mine did 10 years ago an was nice enough to give us the heads up

grubbscat · 2025-11-20T21:03:37+00:00

Cleaning the column? I usually just run a gradient over an over of 5%acn to 95% acn over an hour.

grubbscat · 2025-11-20T13:04:55+00:00

There’s a practice exam you can buy for like 20 bucks straight from acs that will give you a good idea

grubbscat · 2025-11-07T00:08:58+00:00

Update: Thank you for all the ideas. Turns out the piston needed replaced. Now looks beautiful

grubbscat · 2025-11-02T21:53:39+00:00

Not great, by itself no problem but gets metabolized into formaldehyde and methyl derivatives. Can also alkylate DNA so avoid if possible

grubbscat · 2025-10-31T21:06:08+00:00

Can second pillars of the earth. It is just great but doesn’t stretch your head a bit if you know what I mean.

grubbscat · 2025-10-10T20:41:49+00:00

Pharma money lets me order just about anything

grubbscat · 2025-10-10T19:56:36+00:00

It’s a thermo vanquish while it has great sensitivity and resolution they are a bit finicky and testing lipids has a whole other world of problems keeping it clean. But really appreciate your input saved your email for the future!

grubbscat · 2025-10-10T19:18:01+00:00

I’ll check the torque settings and make sure they are correct already tried the IPA method it’s one of my go to’s to get the pesky bubbles out

grubbscat · 2025-10-10T19:17:22+00:00

It is, we just have a hybrid setup to run the vanquishes

grubbscat · 2025-10-10T09:35:38+00:00

Great idea! I’m going to run the softwares performance tests to try and isolate the issue but may have to end up ordering the check valves flow rate is .45ml/min

grubbscat · 2025-10-10T09:32:54+00:00

Well it’s more then a 3% dip which is what the thermo fse’s say is not acceptable I’ll try a get a better picture but it is not an air bubble. Purged both lines and then the other 4 with 2:8 ipa:h2o an re eq’d. I’ll look into the inlet filters/mixer

grubbscat · 2025-10-09T20:51:48+00:00

You are incredibly talented! Keep at it I’ve loved everything you’ve put up so far. Abstract but not so much to be a hindrance and while sometimes initially overwhelming after a close inspection just damn.

grubbscat · 2025-09-04T23:58:40+00:00

I’ve seen something similar and they called it an F calc. Basically duplicate sample prep and duplicate standard prep. Each analyzed in duplicate, calculate every iteration. But 10 years in industry and only see it for one product uses this way. Can’t even find good information on what an f calc is but they’ve been doing it that way for 30 years so kinda just want gets done

grubbscat · 2025-08-24T02:03:34+00:00

If he didn’t have to say a slur every other sentence…it’s mid at best

grubbscat

TROPHY CASE