|
Lipid classa
|
Number of identified species
|
Number of signature ions
|
FAb
|
FAOb
|
HGb
|
NLb
|
MSc
|
|---|
|
PC
|
13
|
4
|
X Xd
| | |
X
|
X
|
|
PC-O
|
17
|
4
|
X
|
X
| |
X
|
X
|
|
LPC
|
4
|
3
|
X
| | |
X
|
X
|
|
Cer
|
3
|
2
| | | | |
X X
|
|
CL
|
10
|
1
| | | | |
X
|
|
LCL
|
2
|
2
| | | | |
X X
|
|
DAG
|
13
|
1
| | | | |
X
|
|
PE
|
22
|
3
|
X X
| | | |
X
|
|
PE-O
|
35
|
3
|
X
|
X
| | |
X
|
|
LPE
|
4
|
2
|
X
| | | |
X
|
|
PG
|
10
|
3
|
X X
| | | |
X
|
|
PI
|
13
|
4
|
X X
| |
X
| |
X
|
|
PS
|
10
|
4
|
X X
| | |
X
|
X
|
|
SM
|
7
|
2
| | | |
X
|
X
|
|
TAG
|
25
|
1
| | | | |
X
|
- aMFQL queries identifying species of these lipid classes are presented in Additional file 15. bFA, acyl anions of fatty acid moieties; FAO, product of the neutral loss of a fatty acid moiety from sn-2 position of the glycerol backbone; HG, fragment of the head group specific for all species of the same lipid class; NL, neutral loss of a fragment specific for all species of the same class; MS, precursor mass. cTwo X symbols indicate that precursor species of this class are detected in two molecular forms (for example, deprotonated ion and acetate adduct), or as doubly and singly charged ions. dTwo X symbols indicate that two signature ions of the same type are observed (for example, two acyl anions of both fatty acid moieties). Cer, ceramides; CL, cardiolipins; DAG, diacylglycerols; LCL, triacyl-lysocardiolipins; LPC, lysophosphatidylcholines; LPE; lyso-phosphatidylethanolamines; PC, phosphatidylcholines; PC-O, 1-alkyl-2-acylglycerophosphocholines; PE, phosphatidylethanolamines; PE-O, 1-alkyl-2-acylglycerophosphoethanolamines; PG, phosphatidylglycerols; PI, phosphatidylinositols; PS, phosphatidylserines; SM, sphingomyelins; TAG, triacylglycerols.
