Algicidal activity of stilbene analogues

Area of Science:

• Natural product chemistry
• Aquatic microbiology
• Environmental science

Background:

• Off-flavors in aquaculture, particularly in catfish, are often caused by cyanobacteria like Oscillatoria perornata.
• 2-methylisoborneol (MIB) is a common compound produced by these cyanobacteria, leading to undesirable taste and odor.
• Natural products and their derivatives are being explored as environmentally friendly alternatives for controlling harmful algal blooms.

Purpose of the Study:

• To synthesize novel stilbene analogues.
• To evaluate the algicidal activity of these compounds against the MIB-producing cyanobacterium Oscillatoria perornata.
• To identify selective and effective compounds for controlling off-flavor in aquaculture.

Main Methods:

• Synthesis of 29 stilbene analogues.
• Algicidal activity assays against Oscillatoria perornata.
• Determination of lowest observed inhibitory concentration (LOIC) and lowest complete inhibition concentration (LCIC).

Main Results:

• The cis and trans isomers of 4-(3,5-dimethoxystyryl)aniline demonstrated moderate and selective algicidal activity.
• These specific stilbene analogues exhibited LOIC and LCIC values of 10 muM against O. perornata.
• This study represents the first report of selective stilbene algicidal activity against a MIB-producing cyanobacteria species.

Conclusions:

• Stilbene analogues, particularly 4-(3,5-dimethoxystyryl)aniline isomers, show promise for controlling MIB-producing cyanobacteria.
• The selective algicidal activity suggests a potential application in managing off-flavors in aquaculture.
• Further research into these compounds could lead to sustainable solutions for the aquaculture industry.