Steven J Symes

3 Questions 5 Answers 0 Followers

Questions related from Steven J Symes

Any ideas what the [M-H]- fatty acid peak at m/z 299 is?

Attached is a .pdf showing the combined mass spectrum (ESI-) for the free fatty acid region of a chromatogram for a Bligh-Dyer lipid extract. I can identify each peak in the spectrum....EXCEPT...

05 October 2018 3,286 5 View

Best sample diluent for LC-MS of bacterial lipid extracts?

Studying bacterial lipids extracted using Bligh-Dyer. Analytes of interest are the phospholipids, specifically PE and PG (these dominate in E. Coli, for example). Using LC-MS (ESI) for...

09 March 2018 4,059 2 View

Any idea what these ESI(-) peaks are...255, 283, 311, 325, 339?

ESI(-) direct inject. Quattro Micro triple quad. See these peaks all the time in Negative mode. See these even in pure MeOH. I only ever use Optima grade solvents. Just opened brand new 4L...

10 May 2016 9,390 11 View