Antifouling Activity of Coumarin and its Derivatives Isolated from the Cinnamon Tree Cinnamomum loureiroi

摘要

The active antifouling compounds coumarin and its derivatives were isolated from the cinnamon tree Cinnainomum loureiroi. The antifouling activities were determined using representative soft fouling organisms: the seaweed Ulvapertusa and diatom Navicula annexa. The chemical constituents with antifouling activities were identified as coumarin, hydroxylcoumarin, coumaric acid, and cinnamaldehyde by interpreting nuclear magnetic resonance, and high-resolution mass spectroscopy data. These compounds wereisolated from 1.09 g of crude Cinnamomum sp. methanol extract, yielding approximately 18.4, 6.3, 9.8, and 14.7 mg of coumarin, hydroxylcoumarin, coumaric acid, and cinnamaldehyde, respectively. The compounds inhibited U. pertusa zoospores with EC_(50) values of 0.13-0.25 pg/mL, and the diatom N. annexa with EC_(50) of 0.21-0.81 mug/mL.