Fig. 4.
The minor sulfonolipid of S. longa. A: Fragmentation pathways; B: ESI MS/MS of the isolated and purified minor sulfonolipid SL2; C: comparison of the ESI MS/MS peaks of the two sulfonolipids SL1 and SL2; D: modulation of the membrane level of the sulfonolipid SL2 by the concentrations of magnesium and sodium ions in the growth medium.