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Quantitation of two samples of cocaine in urine by paper- and polymer-spray MS electropsrayed at 5 kV with 9:1 (v/v) methanol:water spray solvent.
| Substrate | Sample 1 (n = 2) μg/mL |
Sample 2 (n = 3) μg/mL |
|---|---|---|
| Paper | 13.2 ± 0.9 | 4.16 ± 1.22 |
| OSX Polymer | 14.7 ± 1.6 | 4.07 ± 0.11 |
| Actual concentration | 16.3 | 3.67 |
