Wm. Craig Byrdwell, phd

Resources for Lipid Analysis in the 21st Century

This is a Phosphatidyl Serine (PS) molecule. This PS contains an 18:1 (oleic acid) fatty acyl chain and an 18:0 (stearic acid) acyl chain. It is (SO)-PS. Phosphatidyl Serines form protonated molecules, [M+H]+, by electrospray ionization mass spectrometry (ESI-MS) and by atmospheric pressure chemical ionization mass spectrometry (APCI-MS). This PS also forms the diacylglycerol-like fragment ion [SO]+ and other fragments by APCI-MS or by ESI-MS/MS.

Phosphatidylserines Home

This page has been established to disseminate free copies of mass lists of PhosphatidylSerines, or Phosphatidyl Serine (PS) molecular species, also called Glycerophosphoserines (GPSer) .

Mass lists from these pages pertain to analysis of PhosphatidylSerines by atmospheric pressure chemical ionization (APCI)  and electrospray ionization (ESI) mass spectrometry (MS) techniques:


Data are given for Phosphatidyl Serine protonated molecules, lithium, sodium and potassium adducts, diacylglycerol-like fragment ions, and fatty acid-related fragments.

Mass lists are given as:

1.  Fatty Acid and Fatty Acid Methyl Ester mass list.

2.  Phosphatidyl Serine & Fragment Masses by PS name.

3.  Phosphatidyl Serine & Fragment Masses by PS mass.

4.  Masses of Adducts of PhosphatidylSerines by PS name.

5.  Masses of Adducts of PhosphatidylSerines by PS mass.

These tables were put together by Dr. Byrdwell in the course of more than a decade of working on lipid analysis.

These mass lists are provided here as a service to my colleagues.


Please report any errors in these pages to Byrdwell@Byrdwell.com

This Page is



Disclaimer:  Not all fragments or adducts listed here are observed from every class of phospholipid.  Every possible adduct and most fragments have been listed here for the sake of thoroughness, whether they are actually observed or not. The page for each phospholipid class will be tailored as time permits.

To contact me:

Wm. Craig Byrdwell, Ph.D.

Beltsville, MD  20705


E-mail: Byrdwell@Byrdwell.com

© 2005-2011

The figures and tables on this website are copyrighted in 2005-2011 by William Craig Byrdwell and Byrdwell.com.  Please reference



Disclaimer 2:  The information provided here is not approved by, sanctioned by or paid for by Dr. Byrdwell’s employer.  They are not responsible for its content.  Advertisements may appear on some pages to help defray the costs of website publication and maintenance.

Disclaimer 3:  Molecules are drawn to maximize visibility of atoms and bonds and for clarity.  The structures drawn do not necessarily represent the structures of the molecules in biological systems.