(LC/MS) m/z 282 is "plasticizer in polyethylene"?

[Anthony_Ng]

Dear all,

Recently I run the LC-MS with +ve scan (ESI+APCI) and notice that there is a huge response m/z 282.

I searched related topic in this forum and found some hints (which was posted around 2004)

Is there any further method that I can confirm the m/z belonged to "plasticizer in polyethylene"?

I remebered one team member synthesized a compound with -SiMe3 in it. Would the peak belonged to silica related compound?

And...any web site have info about common LC/MSD contaminants?

Thanks in advance!

[bhuvfe]

Anthony_Ng,

I guess you are referring to this http://en.wikipedia.org/wiki/Oleamide (slipping agent).
Did you use any plastic container with organic solvents?


Instead if you think you have a silicon atom you should see a different isotopic pattern.
Do you have access to a GC-MS? That would be a very easy way to confirm/exclude oleamide.



Regarding the list of common contaminats. The supplier of your MS should be able to help you.

Regards,
bhuvfe

[Anthony_Ng]

Thanks!

Actually this mass shows everywhere even in basline.

Probably it comes from MeOH. When I switched to other brand, m/z 282 is small but another m/z 339 is very large.

We didn't use plastic ware but use a small glass vial for sample preparation.