m/z-value m/z-value Ion type Retentiontime [min] Structure assignment
(exp.) (theo.)    
1. Peak 2. Peak
   
       
           
          PI(34:2)
833.56 833.52 [M-H]– 31.26 —
835.54 835.53 – 31.81 — PI(34:1)
[M-H]
         
857.54 857.52 – 31.07 — PI(36:4)
[M-H]
         
859.55 859.55 – 31.09 — PI(36:3)
[M-H]
         
861.56 861.55 – 31.15 — PI(36:2)
[M-H]
         
883.55 883.53 – 30.99 — PI(38:5)
[M-H]
         
885.59 885.55 – 30.97 — PI(38:4)
[M-H]
         
899.57 899.52 – 31.05 — PI(h38:5)
[M-H]
         
901.56 901.54 – 30.97 — PI(h38:4)
[M-H]
         
909.59 909.55 – 30.99 — PI(40:6)
[M-H]
         
917.56 917.61 – 30.95 — PI(40:2)
[M-H]
         
571.31 571.29 – 34.66 — LysoPI(16:0)
[M-H]
         
595.31 595.29 – 34.64 — LysoPI(18:2)
[M-H]
         
597.33 597.30 – 34.50 — LysoPI(18:1)
[M-H]
         
599.35 599.32 – 34.50 — LysoPI(18:0)
[M-H]
         
619.33 619.29 – 34.39 — LysoPI(20:4)
1095.65 1095.64 – 35.72 — GM3(d18:1/12:0)
[M-H]
         
1123.72 1123.67 – 35.61 — GM3(d18:1/14:0)
[M-H]
         
1137.70 1137.65 – 35.48 — GM3(t18:1/14:1)
[M-H]
         
1149.73 1149.69 – 35.54 — GM3(d18:1/16:1)
[M-H]
         
1151.74 1151.71 – 35.50 — GM3(d18:1/16:0)
[M-H]
         
1165.74 1165.69 – 35.54 — GM3(t18:1/16:1)
[M-H]
         
1167.75 1167.70 – 36.38 — GM3(t18:1/16:0)
[M-H]
         
1177.75 1177.72 – 35.40 — GM3(d18:1/18:1)
[M-H]
         
1179.78 1179.74 – 35.40 — GM3(d18:1/18:0)
[M-H]
         
1193.78 1193.72 – 35.40 — GM3(t18:1/18:1)
[M-H]
         
1205.77 1205.75 – 35.29 — GM3(d18:1/20:1)
[M-H]
         
1207.79 1207.77 – 35.29 — GM3(d18:1/20:0)
[M-H]
         
1219.77 1219.73 – 35.42 — GM3(t18:1/20:2)
[M-H]
         
1221.79 1221.75 – 35.15 — GM3(t18:1/20:1)
[M-H]
         
1233.84 1233.78 – 35.20 — GM3(d18:1/22:1)
[M-H]
         
1235.83 1235.80 – 35.20 — GM3(d18:1/22:0)
[M-H]
         
1247.82 1247.76 – 35.12 — GM3(t18:1/22:2)
[M-H]
         
1249.83 1249.78 – 35.16 — GM3(t18:1/22:1)
[M-H]
         
1257.82 1257.79 – 35.25 — GM3(d18:1/24:3)
[M-H]
         
1259.83 1259.80 – 35.18 — GM3(d18:1/24:2)
1261.85 1261.82 – 35.12 — GM3(d18:1/24:1)
[M-H]
         
1263.86 1263.83 – 35.11 — GM3(d18:1/24:0)
[M-H]
         
1275.82 1275.80 – 35.20 — GM3(t18:1/24:2)
[M-H]
         
1277.85 1277.81 – 36.02 — GM3(t18:1/24:1)
[M-H]
         
1279.88 1279.83 – 35.98 — GM3(t18:1/24:0)
[M-H]
         
1291.83 1291.79 – 35.25 — GM3(t18:1/h24:2)
[M-H]
         
1293.82 1293.81 – 35.08 — GM3(t18:1/h24:1)
[M-H]
         
1295.86 1295.82 – 36.54 — GM3(t18:1/h24:0)
[M-H]
         
1354.84 1354.79 – 38.17 — GM2(d18:1/16:0)
[M-H]
         
1368.84 1368.76 – 38.06 — GM2(t18:1/16:1)
[M-H]
         
1380.84 1380.80 – 38.09 — GM2(d18:1/18:1)
[M-H]
         
1382.86 1382.82 – 38.11 — GM2(d18:1/18:0)
[M-H]
         
1396.83 1396.81 [M-H]– 38.06 — GM2(t18:1/18:1)
Table 2: Acidic lipid species detected by (-) nano-HPLC/MS analysis of purified ganglioside fractions corresponding to 1.5 μl human serum of a control volunteer patient. Analyte species printed in bold were monitored within the complete set of investigated samples. Asterisks indicate a subset of ions that was not employed for data normalization since low signal intensity hampered their reproducible detection even within the control group.