Spherical C18-functionalized ordered mesoporous silica packed on micro-solid phase extraction cartridges for simultaneous determination of twenty-three alkaloids in flower extract supplements - Fernandez-Pintor, Begona; Ganan, Judith; Perez-Quintanilla, Damian; Morante-Zarcero, Sonia; Sierra, Isabel (Advances In Sample Preparation, 2025)