Main content area

Studies on estrone biodegradation potential of cyanobacterial species

Sami, Neha, Fatma, Tasneem
Biocatalysis and agricultural biotechnology 2019 v.17 pp. 576-582
Spirulina, bioaccumulation, biodegradation, bioremediation, endocrine-disrupting chemicals, enzyme activity, estrogen receptors, estrone, feces, food chain, growth promotion, homeostasis, humans, laccase, livestock, phenolic compounds, pollutants, reproductive performance, surface water, toxicity, urine
The estrone (E1) excreted through faeces and urine by livestock and humans are present in the water bodies. Even at very low concentrations (0.1–1 ng/l) it poses threat to living organisms as it can bioaccumulate through the food chain. It binds to and activate the estrogen receptors and mimics a normal endocrine response which changes the homeostasis of animals and humans and potentially impairs the reproductive ability. It is a major pollutant and is also designated as an endocrine disrupting compound by the World Health Organization. Hence, there is an urgent need to find out ways for their bioremediation. In the present study, 16 different aquatic cyanobacteria species were screened for estrone bioremediation and the experiments were done in three phases. The first two phases included determination of estrone toxicity and its bioremediation in/by cyanobacteria and the third phase included the determination of degradative role of laccase enzyme. Concentration dependent toxic effect of estrone was observed at 50, 100, and 200 ppm estrone but at 20 ppm estrone slight growth promotion was observed. The degradation efficiency ranged between 53.7% and 94.5%. It was highest at 20 ppm estrone in Spirulina CPCC-695. In order to find out the role of oxidoreductases in estrone (phenolics) degradation, laccase activity was monitored. Maximum laccase activity (34.22 UL−1) was found in Spirulina CPCC-695. Therefore, use of cyanobacteria especially Spirulina CPCC-695 could be recommended for degradation of estrone in aquatic bodies.