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Effects of different solid-phase extraction (SPE) sorbents on the recovery (%) of mycotoxins in corn. For each of the five sorbents, 200 mg of the sorbent was well mixed with 20 mg of MWCNT–COOH and packed into the cartridge. NH2, aminopropyl; C18, octadecylsilyl; HLB, hydrophilic–lipophilic balance; MCX, mixed-mode cationic exchange. Vertical bar represents ± standard error (n = 3).
