Algistat

Abstract

The invention discloses an algistat, which is an absolute methanol crude extract of onion stalks, an absolute acetone crude extract of the onion stalks, an absolute petroleum ether crude extract of the onion stalks or an ethanol crude extract of the onion stalks. Compared with the prior art, the crude extracts from the onion stalks by the organic solvents perform an inhibitory effect to microcystis aeruginosa from high to low as follows: the inhibitory effect of absolute acetone is larger than that of 75% ethanol, the inhibitory effect of the 75% ethanol is larger than that of absolute petroleum ether, and the inhibitory effect of the absolute petroleum ether is larger than that of absolute methanol. The inhibition ratio of the absolute acetone pure extract of the onion stalks is enhanced along with the time, and a concentration effect is shown. The inhibition ratio of a high dose group on the fourth day can be up to 97.7%. EC50 (50% effective concentration) computed on the fifth day is 0.03g / L, which proves that the algal inhibition effect of the purified absolute acetone extract is more obvious than that before purification.

Description

technical field

[0001] The invention belongs to the technical field of algicides. Background technique

[0002] In recent years, with the increase of human activities, the eutrophication of lakes and reservoirs has become increasingly serious, resulting in frequent outbreaks of algae blooms and reduced utilization efficiency of water resources. As a result, the aquaculture economy has suffered huge losses, and water environment security is also facing serious challenges. threat. Therefore, effectively inhibiting the excessive growth of phytoplankton in eutrophic water bodies and preventing the occurrence of algae blooms has become a research hotspot and frontier in the field of environment. Among the many methods to control the growth of algae, the traditional physical and chemical methods of inhibiting the growth of algae will inevitably destroy the ecological balance and cause environmental pollution. The biological method, especially the use of plant allelopathy to inhi...

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