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RISS 인기검색어
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- 저자 : Dzmitry Hrynsphan (검색결과 2 건)
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Jinjia He,Yi Chen,Luyao Dai,Jiachao Yao,Yu Mei,Dzmitry Hrynsphan,Savitskaya Tatsiana,Jun Chen 한국생물공학회 2020 Biotechnology and Bioprocess Engineering Vol.25 No.4
Acrylic acid is used in various industrial applications but inflicts harm to human health and causes environmental pollution. A new bacterium, identified as Rhodococcus ruber JJ-3, was isolated, which can degrade high concentrations of acrylic acid rapidly and completely. Experimental results showed that the strain can achieve complete degradation of 1000 mg·L−1 acrylic acid in 11 h under the following conditions: pH 7, temperature 35°C, and inoculation quantity 15%. A high concentration of acrylic acid (2000 mg·L−1) can be completely removed in 28 h. According to the Monod model, the maximum specific degradation rate (vmax) and half saturation rate constant (KS) of the strain were 0.85 h−1 and 101.83 mg·L−1, respectively. The results of carbon balance revealed that 54.6% carbon was assimilated by R. ruber JJ-3 as biomass, and 43.0% carbon was mineralized into CO2. Furthermore, glycerol and lactic acid were measured as intermediates, and the possible degradation pathway was proposed during the biodegradation of acrylic acid. These results suggested that R. ruber JJ-3 completely degrades acrylic acid and might have a potential environmental implication in the purification of acrylic acid-contaminated environments.
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Yi Chen,Min Zhao,Liyong Hu,Zeyu Wang,Dzmitry Hrynsphan,Jun Chen 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.6
Acrylic acid has been widely used in various industrial applications but is harmful to human health and the environment. A novel and efficient degrading acrylic acid bacterium was isolated and identified as Bacillus aryabhattai CY. In this study, batch experiments were conducted to evaluate the biodegradation of acrylic acid by B. aryabhattai CY, which were immobilized in calciumalginate beads under different conditions. The components of the alginate beads were optimized by the response surface method, and the degradation performance of the immobilized cells was determined. Relative to the free cells, experiment results showed that the immobilized cells can achieve complete degradation of 100 mg/L acrylic acid in 24 h under the optimal conditions of SA 6% (w/v), CaCl2 1% (w/v), and immobilization time of 6 h. According to Haldane's model, the maximum specific growth rate (μmax) of the free cells and immobilized cells were 0.165/h and 0.210/h, respectively. Experiment data revealed that acrylic acid showed an inhibitory effect on biodegradation by B. aryabhattai CY, especially at concentration higher than 100 mg/L. Furthermore, the reusability of the immobilized cells revealed that the acrylic acid removal rate was above 93.70% within the eight cycles. The immobilized cells also showed higher removal efficiencies in wider ranges of temperature (20°C-60°C) and pH (5.0-10.0) than the free cells. Moreover, the possible degradation intermediates were proposed during the biodegradation of acrylic acid by GC-MS analysis. Results indicated that immobilized beads might have a potential environmental implication in the purification of practical acrylic acid wastewater.
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