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Impact of the CycHDMAA concentration on the detectability of the PTO. Column, continuous styrene-divinylbenzene copolymer, 50 × 0.20 mm i.d.; mobile phase, (A) 1.0–50 mM CycHDMAA, pH 8.4, 100 μM ascorbic acid, (B) 1.0–50 mM CycHDMAA, pH 8.4, 100 % ACN, 100 μM ascorbic acid; linear gradient, 5 % B for 3 min, 5–95 % B in 7 min; flow rate, 2 μl/min; temperature, 70 °C; scan mode, MS; sample, PTO, 2 pmol with 1.0 mM ascorbic acid
