Last week of November I and Louise participated in a two-day NTS workshop on analytical techniques and implementation followed by a two-day NORMAN network‘s annual meeting in Odense, Denmark. NORMAN interlaboratory comparison of semi-quantification methods We presented the quantification strategies for the LC/HRMS nontarget screening together with a first glance at the results from the […]
26
Oct
Oct
Last Tuesday Jon Sobus from EPA presented some of the findings from a recent paper Uncertainty estimation strategies for quantitative non-targeted analysis, where we were also happy to collaborate, on the BP4NTA online meeting. People from BP4NTA meetings have been reaching out with questions on ionization efficiency-based quantification. Some of these are often asked of us and I decided […]
03
Oct
Oct
This is Yvonne, a second-year Master’s student in Analytical Chemistry. There are two things she cannot get enough of – hiking and gaining new knowledge. Yvonne has just started her Master’s thesis in which she is exploring the possibility of using deep learning for toxicity predictions. She is training an autoencoder to compress the HRMS […]
08
Sep
Sep
Last week Amina, Pilleriin, and I participated in the International Mass Spectrometry conference 2022 in Maastricht, The Netherlands. With more than 1300 participants IMSC was the first big mass spec conference in Europe after covid and a special feeling of enthusiasm was in the air. We kicked off on Monday morning with a session on […]
21
Aug
Aug
This June Linköping hosted the second national meeting of the Swedish chemical society which Helen, Amina, Anneli and I all attended together with Tim Åström and Sara Jamshidi who also work in the analytical chemistry section at SU. Helen, Amina and I all gave oral presentations of our work and Anneli presented Lisa’s poster of […]
Recently, I attended my first in-person conference, the Nontarget Analysis for Environmental Risk Assessment SETAC Focused Topic Meeting. It was held in Durham, NC, USA from May 22 -26 2022, and it was a very intense week filled with interesting talks, posters, and meetings with other scientists. It was very nice to put a face […]
30
Mar
Mar
Retention time is a crucial information for structural elucidation of unknown chemicals in non-targeted analysis using liquid chromatography coupled to high resolution mass spectrometry via electrospray ionization (LC/ESI/HRMS). Most of the predictive models of retention time are developed in limited chromatographic conditions, mostly for reversed phase and HILIC mode and in acidic conditions. However, retention […]
24
Feb
Feb
Masoumeh Akhlaqi is a Master student in analytical chemistry at Stockholm University. For her Master’s thesis, she is using two-dimensional ion mobility to separated, distinguish or identify isomeric compounds, specifically isomeric pesticides in food samples. For this purpose, she is using cyclic ion mobility instrument coupled to liquid chromatography and Time-of-Flight mass analyzer.
20
Feb
Feb
Non-target analysis with LC/ESI/HRMS is increasingly used to detect thousands of chemicals in environmental samples. However, most of these chemicals are never confidently identified nor quantified. This in turn means that they are ignored in risk assessments. In our recent paper, we address this issue by modeling the response factor for chemicals without the need […]
02
Feb
Feb
Lisa is a second year Master’s student with a background in environmental chemistry. For her Master’s thesis, Lisa is working on the exciting field of non-targeted screening and developing a prioritization method for unidentified compounds in the MS spectra of real life samples. In order to give compounds priority ranks, she is using in-house built […]