Minimum amount required (in µg) for inhibition of microbial growth on TLC plates for extracts and isolated alkaloids of Z. rhoifolium.

*(ATCC = merican Type Culture Collection): Bacteria: Staphylococcus epidermidis-Se (ATCC 12228); Staphylococcus aureus-Sa (ATCC 6538); Bacillus subtilis-Bs (ATCC 6633); Klebsiella pneumoniae-Kp (ATCC 13883); Escherichia coli-Ec (ATCC 25922); Pseudomonas aeruginosa-Pa (ATCC 27853); Shigella sonnei-Ss (ATCC 25931); Yeasts: Candida albicans-Ca (ATCC 10231); Sacharomyces cerevisae-Sc (ATCC 2601); Cryptococcus neoformans-Cn (ATCC 28952). NT = not tested; NA = not active;abasic;bChloramphenicol for bacteria and Nystatin for yeasts.