Research on Algistatic Activities of Allelochemicals in Magnolia Grandiflora Leaves and GC-MS Analysis

[Objective] In order to investigate the antialgal activities and species of the allelochemicals in Magnolia grandiflora leaves.[Method] The antialgal substances against microcystic aeruginosa from the extracts of magnolia grandiflora leaves were separated,purified and identified based on the activity test,using silica gel column chromatography,gel column chromatography and GC-MS method and combining the algae inhibition experiment.[Result] The maximum inhibition rate of the extracts of magnolia grandiflora leaves on microcystic aeruginosa growth was 97.4% with the concentration of 8 g/L.A large amount of antialgal substances were found in the n-butanol extracts of magnolia grandiflora and had very good inhibition effects on microcystic aeruginosa,which were mainly small molecule substances such as alcohols,ketones and esters.[Conclusion] A new idea on developing new algal inhibitors had been provided.