Table 4.

Antimicroalgal and antibacterial activities of 1, 2, 5, and 6.

	IC50 (μg/mL)				Inhibitory Zone Diameter (mm) at 20 μg/disk
	Chattonella marina	Heterosigma akashiwo	Karlodinium veneficum	Prorocentrum donghaiense	Vibrio parahaemolyticus	Vibrio anguillarum	Vibrio harveyi	Vibrio Splendidus
1	– a	30	27	– b	6.7	6.5	6.5	6.3
2	15	8.4	10	14	6.4	7.5	7.0	6.3
5	4.2	7.2	8.5	6.9	6.2	7.0	6.5	6.2
6	30	35	39	37	6.7	8.5	8.0	6.5
K2Cr2O7	0.46	0.98	0.89	1.92
chloramphenicol					20	18	18	19

^a Inhibition rate was 65% at 100 μg/mL. ^b Inhibition rate was 50% at 100 μg/mL.