Wm. Craig Byrdwell, phd

Resources for Lipid Analysis in the 21st Century

This is a Phosphatidyl Choline (PC) molecule. This PC contains an 18:1 (oleic acid) fatty acyl chain and a 16:0 (palmitic acid) acyl chain. It is (PO)-PC. Phosphatidyl Cholines form protonated molecules, [M+H]+, by electrospray ionization mass spectrometry (ESI-MS) and by atmospheric pressure chemical ionization mass spectrometry (APCI-MS). This PC also forms the diacylglycerol-like fragment ion [OP]+ and other fragments by APCI-MS and by ESI-MS/MS

PhosphatidylCholines Home

This page has been established to disseminate free copies of mass lists of PhosphatidylCholines, or Phosphatidyl Choline (PC) molecular species, which are more formally called Glycerophosphocholines (GPCho). They are the major components of Lecithin, often obtained as a lipid extract from egg yolks or soybeans.

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


Data are given for Phosphatidyl Choline 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 Choline & Fragment Masses by PC name.

3.  Phosphatidyl Choline & Fragment Masses by PC mass.

4.  Masses of Adducts of PhosphatidylCholines by PC name.

5.  Masses of Adducts of PhosphatidylCholines by PC 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


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





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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.

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.