Antimicrobial Activity of the Secondary Metabolites Isolated from a South African Red Seaweed, .

South Africa's highly diverse marine biota includes several endemic marine red algae of the genus. Cryptic species and morphological variability make the taxonomy of plant challenging, and a record of the secondary metabolites isolated from South African spp. can be used to assess their chemotaxonomic significance.

Identification and in vitro anti-esophageal cancer activity of a series of halogenated monoterpenes isolated from the South African seaweeds Plocamium suhrii and Plocamium cornutum.

Five known (1, 2, 4, 6 and 7) halogenated monoterpenes together with 1Z,3R∗,4S∗,5E,7Z)-1-bromo-3,4,8-trichloro-7-(dichloromethyl)-3-methylocta-1,5,7-triene (3) and (3R∗,4S∗)-3,4,6,7-tetrachloro-3,7-dimethyl-octen-1-ene (5) were isolated from the red macroalga Plocamium suhrii and their structures deduced from their spectroscopic data. The seven compounds from P. suhrii together with five related compounds from Plocamium cornutum have been evaluated for their cytotoxic effects on an esophageal cancer cell line (WHCO1).