Dear Sir. Concerning your issue about the identification of alkaloids for different cancer cell treatment. Alkaloids are a class of naturally occurring organic nitrogen containing bases. Typical alkaloids are derived from plant sources, they are basic, they contain one or more nitrogen atoms (usually in a heterocyclic ring) and they usually have a marked physiological action on man or other animals. Alkaloids have potent anticancer activity against various cancers. In this review mainly discussed about alkaloids isolated and identified from plants that present anticancer activity. These substances have been classified by chemical groups and each provides the most relevant information of its pharmacological activity, action mechanism, chemical structure and other properties. Alkaloids extracts from areal parts were subjected to solvent fractionation and GCMS analysis, or can be elucidated with various spectroscopic methods such as 1D- and 2D- NMR, IR, UV and LCMS. I think the following below links may help you in your analysis:

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0087286

http://ukaazpublications.com/attached/publications/C7-Alkaloids.pdf

http://phyto.revuesonline.com/articles/lvphyto/abs/2016/03/lvphyto2016143p188/lvphyto2016143p188.html

Thanks