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. Author manuscript; available in PMC: 2015 May 20.
Published in final edited form as: Anal Chem. 2011 Mar 23;83(8):3192–3198. doi: 10.1021/ac103093w

Table 2.

Comparison between the On-Column Limit of Detection (LOD) of 3-Picolylamide (PA), 3-Picolinyl Ester (PE), and Dimethylaminoethyl Ester (DMAE) Derivatives of FAs Analyzed by Orbitrap (Exactive) and Tandem (TSQ) Mass Spectrometersa

name FA-PA derivatives
FA-PE derivatives
FA-DMAE derivatives
tR (min) orbitrap LOD (fmol) TSQ LOD (fmol) tR (min) orbitrap LOD (fmol) TSQ LOD (fmol) tR (min) orbitrap LOD (fmol) TSQ LOD (fmol)
OA 8.6 11 280 9.0 44 84 5.8 30 180
PLA 3.6 7 30 6.0 43 63 2.8 22 30
LA 4.7 6 96 6.0 20 81 3.5 22 70
EDA 9.4 8 98 9.6 11 34 6.8 37 65
AA 4.6 9 101 5.4 20 176 3.4 63 167
ALA 2.9 25 55 4.4 30 165 2.3 13 39
EPA 2.9 20 38 3.6 21 106 2.2 24 190
DPA 5.5 15 89 6.1 64 70 3.8 135 62
DHA 4.3 4 40 4.4 42 140 3.2 13 23
SA 11.3 5 130 14.0 112 135 9.7 26 148
PA 7.0 20 138 8.9 35 59 4.8 34 97
MA 2.9 13 28 5.7 12 45 2.4 28 23
α-ESA 3.9 1.3 nmol NDb 5.2 ND ND 2.9 ND ND
cisPA 2.6 8.4 nmol ND 3.3 ND ND 2.1 ND ND
a

The abbreviation of each analyte is shown in Table 1.

b

ND: Not determined.