Discussion:
help !!
(too old to reply)
Merlin
2007-10-10 15:00:45 UTC
Permalink
Hi everybody
I just finished experiments of GC-MS, and I have 3 undetermined peaks. I
searched for oxysterols, but there are not (ecdysones??). Where can I
found a MS database; ie enter my peaks and get some clues?

cheers
Olivier
c***@one.net.au
2007-10-12 03:51:25 UTC
Permalink
Post by Merlin
Hi everybody
I just finished experiments of GC-MS, and I have 3 undetermined peaks. I
searched for oxysterols, but there are not (ecdysones??). Where can I
found a MS database; ie enter my peaks and get some clues?
cheers
Olivier
Merlin
Learn some manners. Don't change a topic -Create your own
Merlin
2007-10-12 09:01:47 UTC
Permalink
Post by c***@one.net.au
Post by Merlin
Hi everybody
I just finished experiments of GC-MS, and I have 3 undetermined peaks. I
searched for oxysterols, but there are not (ecdysones??). Where can I
found a MS database; ie enter my peaks and get some clues?
cheers
Olivier
Merlin
Learn some manners. Don't change a topic -Create your own
sorry but It's a question of "analytical chemistry" isn't it ?? I don't
have the feeling to be out of the topic. Sorry for my mistake.
David Stone
2007-10-12 11:28:51 UTC
Permalink
Post by Merlin
Post by c***@one.net.au
Post by Merlin
Hi everybody
I just finished experiments of GC-MS, and I have 3 undetermined peaks. I
searched for oxysterols, but there are not (ecdysones??). Where can I
found a MS database; ie enter my peaks and get some clues?
cheers
Olivier
Merlin
Learn some manners. Don't change a topic -Create your own
sorry but It's a question of "analytical chemistry" isn't it ?? I don't
have the feeling to be out of the topic. Sorry for my mistake.
I think the key term is "Subject" - create a relevant subject line
that reflects what your post is about. You're more likely to get
appropriate responses that way!

The main MS database we use here is the NIST one. Note that there's
no guarantee with any database that you'll get a decent match, or that
a match unambiguously identifies the peak in your chromatogram. If
you suspect specific oxysterols, run pure standards and see how they
compare!
Merlin
2007-10-15 10:53:20 UTC
Permalink
Post by David Stone
Post by Merlin
Post by c***@one.net.au
Post by Merlin
Hi everybody
I just finished experiments of GC-MS, and I have 3 undetermined peaks. I
searched for oxysterols, but there are not (ecdysones??). Where can I
found a MS database; ie enter my peaks and get some clues?
cheers
Olivier
Merlin
Learn some manners. Don't change a topic -Create your own
sorry but It's a question of "analytical chemistry" isn't it ?? I don't
have the feeling to be out of the topic. Sorry for my mistake.
I think the key term is "Subject" - create a relevant subject line
that reflects what your post is about. You're more likely to get
appropriate responses that way!
The main MS database we use here is the NIST one. Note that there's
no guarantee with any database that you'll get a decent match, or that
a match unambiguously identifies the peak in your chromatogram. If
you suspect specific oxysterols, run pure standards and see how they
compare!
the problem is that my molecle isn't in NIST, so it's not a oxysterol...
or not a referenced one (that i doubt)

Loading...