Wm. Craig Byrdwell, phd

Resources for Lipid Analysis in the 21st Century

This is the protonated molecule, [M+H]+, of d18:1/18:0 Sphingomyelin that would be observed by mass spectrometry.  This molecule is the most abundant SPM molecular species in bovine brain sphingomyelin.  In biological systems, the molecule is usually zwitterionic.

Sphingomyelin and Dihydrosphingomyelin Home

This page has been established to disseminate free copies of mass lists of Sphingomyelin and Dihydrosphingomyelin molecular species.

Mass lists from this page pertain to analysis of Sphingomyelin and Dihydrosphingomyelin by atmospheric pressure chemical ionization (APCI) and electrospray ionization (ESI) mass spectrometry (MS) techniques:


Data are given for protonated molecules, ammonium adducts, sodium adducts, and fragments from Sphingomyelin and Dihydrosphingomyelin by APCI-MS and ESI-MS.

Mass lists are given as:

1.  Sphingolipids with 18:1 long-chain base backbones (Sphingomyelin)

2.  Sphingolipids with 18:0 long-chain backbones (Dihydrosphingomyelin)

3.  Fragments produced by different lengths of carbon chains and no 4,5 trans double bond (DSM) or one 4,5 trans double bond (SM).

These tables were put together by Dr. Byrdwell and by Richard H. Perry for his Master’s  thesis.

Wm. Craig Byrdwell, Ph.D.

Research Chemist

Food Composition Laboratory


10300 Baltimore Ave.

Bldg. 161, BARC-East

Beltsville, MD  20705

To contact me:

Phone: 301-504-9357

Fax: 301-504-8314


Please bring any inaccuracies in these pages to my attention at:

E-mail: Byrdwell@Byrdwell.com

Copyright © 2005-2011



The figures and tables on this website are copyrighted in 2005-2011 by William Craig Byrdwell.  If you use these tables please reference



Structures and masses are given for the forms of Sphingomyelin and Dihydrosphingomyelin that are observed by mass spectrometry— NOT the naturally occurring forms. In biological systems, the phosphate oxygen is usually not protonated. At biological pH, the molecule is usually zwitterionic.

This Website has been recently updated!

Notice the expanded content.


Mass lists including odd long-chain base (LCB) species and a comprehensive

Master List

of Sphingomyelin and Dihydrosphingomyelin species have been added!

© 2005-2011

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