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Park G, Kim Y, Lee HH, Lee OM, Park J, Kim YJ, Lee KM, Heo MS, Son HJ. Characterization and applicability of novel alkali-tolerant carbonatogenic bacteria as environment-friendly bioconsolidants for management of concrete structures and soil erosion. J Environ Manage 2022; 321:115929. [PMID: 35985272 DOI: 10.1016/j.jenvman.2022.115929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 07/19/2022] [Accepted: 07/31/2022] [Indexed: 06/15/2023]
Abstract
Cracking and erosion are critical factors that reduce the mechanical properties and stability of concrete structures and soil, respectively. They are recognized worldwide as severe disasters causing the collapse of many structures including stone heritage and dams, and landslides. Therefore, it is essential to propose effective and environment-friendly management methods to prevent them. Carbonatogenesis has recently received considerable attention as a reliable biological process for remediating cracks in calcareous structures, stabilizing loose soils, and sequestering CO2 in the environment. Isolating and characterizing carbonatogenic bacteria with excellent performance is crucial for applying this process to the field of environmental and civil engineering. The aim of this study was to isolate new CaCO3-precipitating bacteria and investigate various properties for their use as bioconsolidants. Furthermore, the possibility of restoring damaged structures and stabilizing loose sandy soil using isolated strain was investigated. Strain LC13 with urease and CaCO3-precipitating activity was isolated from limestone cave soil in Korea and identified as Arthrobacter sulfureus by phenotypic characterization and 16S rRNA gene analysis. Although cell growth was observed after an adaptation period at pH 11, strain LC13 grew well at pH 7-11, indicating alkali tolerance. The optimal conditions for CaCO3 precipitation were 1.0% yeast extract, 2.5% urea, 0.35% NaHCO3, and 400 mM CaCl2, with an initial pH of 6.5 at 30 °C. Under optimized conditions, maximal CaCO3 (22.92 ± 0.14 g/l) precipitated after 3 days, which was 10.8-fold higher than the value in a urea-CaCl2 medium. CaCO3 precipitation by strain LC13 was associated with an increased pH due to ureolysis and protein deamination. Using an optimized medium as a cementation solution, strain LC13 completely remediated 340-760 μm wide cracks over 3 days, and also restored the spalling of concrete surfaces. Furthermore, the sand treated with LC13 solidified with a surface strength of 14.9 kPa. Instrumental analysis confirmed that the crystals precipitated were a mixture of CaCO3 polymorphs composed of rhombohedral calcite and spherical vaterite. These results suggest that A. sulfureus LC13 may be useful for implementing sustainable biorestoration and environmental management technologies such as the in situ remediation of structural cracks and in situ prevention of soil erosion.
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Affiliation(s)
- Gyulim Park
- Department of Life Science and Environmental Biochemistry/Life and Industry Convergence Research Institute, Pusan National University, Miryang, 50463, Republic of Korea
| | - Yerin Kim
- Department of Life Science and Environmental Biochemistry/Life and Industry Convergence Research Institute, Pusan National University, Miryang, 50463, Republic of Korea
| | - Hyun Ho Lee
- Department of Life Science and Environmental Biochemistry/Life and Industry Convergence Research Institute, Pusan National University, Miryang, 50463, Republic of Korea
| | - O-Mi Lee
- Avian Disease Division, Animal and Plant Quarantine Agency, Gimcheon, 39660, Republic of Korea
| | - Jinkuk Park
- Department of Marine Life Science, Jeju National University, Jeju, 63243, Republic of Korea
| | - Yu-Jin Kim
- Department of Life Science and Environmental Biochemistry/Life and Industry Convergence Research Institute, Pusan National University, Miryang, 50463, Republic of Korea
| | - Kwang Min Lee
- Department of Life Science and Environmental Biochemistry/Life and Industry Convergence Research Institute, Pusan National University, Miryang, 50463, Republic of Korea
| | - Moon-Soo Heo
- Department of Marine Life Science, Jeju National University, Jeju, 63243, Republic of Korea
| | - Hong-Joo Son
- Department of Life Science and Environmental Biochemistry/Life and Industry Convergence Research Institute, Pusan National University, Miryang, 50463, Republic of Korea.
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Zhao G, Sun W, Wang J. Purification and characterization of a novel NADPH-dependent 2-aminoacetophenone reductase from Arthrobacter sulfureus. J Biosci Bioeng 2015; 119:648-51. [PMID: 25488497 DOI: 10.1016/j.jbiosc.2014.11.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2014] [Revised: 09/30/2014] [Accepted: 11/05/2014] [Indexed: 11/24/2022]
Abstract
A novel 2-aminoacetophenone reductase was purified to homogeneity from Arthrobacter sulfureus BW1010. The enzyme is a monomer with a molecular weight of approximately 60 kDa. Using NADPH as coenzyme, it catalyzes the reduction of ketones, especially amine phenyl ketones, and stereospecifically reduces 2-aminoacetophenone to (S)-2-amino-1-phenylethanol (e.e > 99.8%) with the optimal pH at 7.5.
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