These are the analytical procedures that they used. They did not have a dietary history for the urine samples. They did however say that this was an initial result, suggesting that further investigation was warranted. So it is initial not conclusive research.
Quote:
3. Analytical procedures
The human urine samples were analyzed by means of a validated GC-MSMS
method. In addition we determined creatinine to correct for diurese, if needed.
Brief descriptions and the relevant specifications are listed below.
Analytical Method for Glyphosate and AMPA
Sample preparation:
1) Evaporation and dissolution of the residue in methanol,
2) derivatization using trifluoroethanol and trifluoroactic acid anhydride
Internal Standards:
13C2
15N-Glyphosate; 13C
15N-AMPA
Measurement: GC-MSMS, NCI mode
Capillary Column: HP-Innowax
Precision: 8% each
Recovery: 95% each
Linearity: 0,2 - 20 µg/L each
Limit of Quantitation (LOQ): 0,15 µg/L each
