Microalgae mediated degradation of the herbicide atrazine

Microalgae mediated degradation of the herbicide atrazine
이민선Akhil N. Kabra지민규EI-Sayed Salama전병훈
Atrazine; Microalgae; Biodegradation; Bioaccumulation; Lipid; FAME
Issue Date
248th ACS National Meeting
Atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] is used to efficiently control broad leaf and grassy weeds in agriculture and is one of the most widely used herbicides in the world. Its widespread application, persistence and mobility have led to its frequent detection in ground and surface water sources. Atrazine imposes detrimental effects on the aquatic ecosystem and also affect the human endocrine, central nerve, immune and reproductive systems. Microalgae can serve as potential biological agents to remove such xenobiotic compounds from contaminated water streams to a substantial level due to their heterotrophic capability and endogenous catabolic systems. This study evaluated the toxicity of atrazine, along with its bioaccumulation and biodegradation in the green microalga Chlamydomonas mexicana. The effect of atrazine on the fatty acid composition, carbohydrate content and nutrient removal efficiency of the microalga was also determined. Atrazine had no profound effect on the microalga at low concentration (10 μg/L), while higher concentrations (25, 50 and 100 μg/L) imposed toxicity, leading to inhibition of cell growth and chlorophyll a accumulation by 22, 33 and 36%, and 13, 24 and 27%, respectively. Atrazine 96-h EC50 for C. mexicana was estimated to be 33 μg/L. Simultaneous bioaccumulation and biodegradation of atrazine by the microalga resulted in 14-36% atrazine degradation at 10-100 μg/L. The fraction of monounsaturated fatty acids (palmitoleic and oleic acids) increased with the increasing atrazine concentration. Carbohydrate content of the microalga also increased up to 15%. The microalga demonstrated T-N and T-P removals from 50 to 73% and 4 to 26%, respectively, at 0-100 μg/L. This study shows that C. mexicana has the capability to degrade atrazine, which can lead to the development of a sustainable bioremediation strategy for atrazine contaminated streams, with simultaneous nut
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