Layer-by-layer functionalized porous Zinc sulfide nanospheres-based solid-phase extraction combined with liquid chromatography time-of-flight/mass and gas chromatography-mass spectrometry for the specific enrichment and identification of alkaloids from Crinum asiaticum var. sinicumDong Zhu, Yue Hu, Rui Yang et al.|Analytica Chimica Acta|2016Cited by 12