Re: Repeat mass unit 113Da in Positive ESI

Dan Kirby (dkirby@fas.harvard.edu)
Thu, 13 Aug 1998 19:19:40 -0400

Ping,
The 113 repeats are most likely TFA clusters. Quite common and they tend to
stay around for a while because of their high intensity.

At 09:22 AM 8/13/98 -0600, you wrote:
>Dear Colleagues,
>
>I am currently running positive ESI (LC/MS) on an LCQ unit. In a blank run,
>a huge peak shows a mass spectrum with a bunch of peaks with mass
>difference of 113 (340, 453, 566, 679, 792, 905, 1018, ...). Does anyone
>have any idea what these might be? I assume those are clusters.
>
>Your suggestions and comments are greatly appreciated.
>
>Thank you.
>
>____________________________________
>Ping Wang, Ph.D.
>Nycomed Amersham
>466 Devon Park Dr.
>Wayne, PA 19087
>(610) 225-4104
>Ping.Wang@US.Nycomed-Amersham.com
>____________________________________
>
>

__________________________

Dan Kirby
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dkirby@fas.harvard.edu