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. 2020 Oct 6;15(10):e0235526. doi: 10.1371/journal.pone.0235526

Table 1. Compositions of the d-SPE tubes used for purification of extraction solutions.

MgSO4 PSA C18 GCB
d-SPE 1 150 mg 25 mg - -
d-SPE 2 150 mg 25 mg 25 mg -
d-SPE 3 150 mg 25 mg - 2.5 mg
d-SPE 4 150 mg 50 mg - -
d-SPE 5 150 mg 50 mg 50 mg -
d-SPE 6 150 mg 50 mg - 50 mg

PSA, primary secondary amine; GCB, graphitized carbon black.