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Herein we describe some aspects of the ethnobotanical use and the first  alkaloid profile of Lupinus jaimehintoniana, the 5 to 8 m high arboreous  lupine. Five quinolizidine alkaloids identified as sparteine,  5,6-dehydrolupanine, lupanine, nuttalline, and d-thermopsine, were  characterized by the respective elution order according to their electronic  impact spectra, lupanine being the most abundant in the four different  tissues analyzed. Simultaneously, an antibacterial assessment of the four  corresponding crude methanolic extracts, as well as the four semi-purified  alkaloids was performed on specific Escherichia coli and Agrobacterium  tumefaciens strains. These experiments resulted in MIC ranges of 37-61 µg  mL-1 and 130-146 µg mL-1, respectively. for both bacterial species. Finally,  the allelopathic activity of these extracts on the germination of Lactuca  sativa seeds was demonstrated to be in the range of 50-300 µg mL-1 for both  semi-purified alkaloid and methanolic extracts

Alkaloid profile, antibacterial and allelopathic activities of Lupinus jaimehintoniana B.L. Turner (Fabaceae)