Table 1.

pKa values for acid and base groups in common plant phospholipids. All values taken from Marsh (2013) [71] except where otherwise referenced. Ammonium pKa values only apply to lipids with ammonium groups (PS, PE, and PC).

Lipid	Phosphate pKa	Ammonium pKa
PS	2.6	11.55
PE	1.7	9.8
PC	1.5	13.9 [72]
PI	2.5	n/a
PA	3.2 [69], 11.5 [70]	n/a
PG	3.5	n/a