“…The sample was then centrifuged (4500 rpm, 60 min, 4 • C). Cadaverine extraction was performed using perchloric acid, as previously outlined [12,21,22]. Subsequent purification used Oasis WCX (60 mg, 3 cc) (Waters Corp., Milford, MA, USA) and Strata XL-CW (100 mg, 6 cc) (Phenomenex, Torrence, CA, USA) ion-exchange columns for MB and EB, respectively [23], followed by chromatographic separation using a reverse-phase column (Kinetex 2.6 µm C18 100A, 100 × 3 mm) (Phenomenex) with heptafluorobutyric acid as an ion-pairing agent [24,25].…”