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. 2018 Sep 15;23(9):2359. doi: 10.3390/molecules23092359

Figure 2.

Figure 2

Chromatogram obtained in the analysis of residues of cannabis (sample M1, 0.82 mg), and comparison of the spectra obtained for the peaks of the suspected cannabidiol (CBD), cannabinol (CBN), and THC and those of standard solutions. The methanolic extract collected after processing the swab was diluted 1:5 with ultrapure water before the IT-SPME-nanoLC step. Conditions used for IT-SPME and chromatographic analysis were identical to those indicated in Section 4.3 and Section 4.2, respectively.