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Vaishnav A, Kumar R, Singh HB, Sarma BK. Extending the benefits of PGPR to bioremediation of nitrile pollution in crop lands for enhancing crop productivity. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 826:154170. [PMID: 35227717 DOI: 10.1016/j.scitotenv.2022.154170] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 02/06/2022] [Accepted: 02/23/2022] [Indexed: 06/14/2023]
Abstract
Incessant release of nitrile group of compounds such as cyanides into agricultural land through industrial effluents and excessive use of nitrile pesticides has resulted in increased nitrile pollution. Release of nitrile compounds (NCs) as plant root exudates is also contributing to the problem. The released NCs interact with soil elements and persists for a long time. Persistent higher concentration of NCs in soil cause toxicity to beneficial microflora and affect crop productivity. The NCs can cause more problems to human health if they reach groundwater and enter the food chain. Nitrile degradation by soil bacteria can be a solution to the problem if thoroughly exploited. However, the impact of such bacteria in plant and soil environments is still not properly explored. Plant growth-promoting rhizobacteria (PGPR) with nitrilase activity has recently gained attention as potential solution to address the problem. This paper reviews the core issue of nitrile pollution in soil and the prospects of application of nitrile degrading bacteria for soil remediation, soil health improvement and plant growth promotion in nitrile-polluted soils. The possible mechanisms of PGPR that can be exploited to degrade NCs, converting them into plant useful compounds and synthesis of the phytohormone IAA from degraded NCs are also discussed at length.
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Affiliation(s)
- Anukool Vaishnav
- Department of Biotechnology, GLA University, Mathura 281406, India; Agroecology and Environment, Agroscope (Reckenholz), Zürich 8046, Switzerland
| | - Roshan Kumar
- National Centre for Biological Sciences (TIFR-NCBS), Bengaluru 560065, India
| | | | - Birinchi Kumar Sarma
- Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi 221110, India.
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2
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Himalayan Fern Cheilanthes bicolor Mediated Fabrication and Characterization of Iron Nanoparticles with Antimicrobial Potential. BIONANOSCIENCE 2022. [DOI: 10.1007/s12668-022-00969-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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3
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Chen Y, Zhao M, Hu L, Wang Z, Hrynsphan D, Chen J. Characterization and Functional Analysis of Bacillus aryabhattai CY for Acrylic Acid Biodegradation: Immobilization and Metabolic Pathway. BIOTECHNOL BIOPROC E 2021. [DOI: 10.1007/s12257-021-0025-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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4
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Abdul Manaf SA, Mohamad Fuzi SFZ, Low KO, Hegde G, Abdul Manas NH, Md Illias R, Chia KS. Carbon nanomaterial properties help to enhance xylanase production from recombinant Kluyveromyces lactis through a cell immobilization method. Appl Microbiol Biotechnol 2021; 105:8531-8544. [PMID: 34611725 DOI: 10.1007/s00253-021-11616-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 09/13/2021] [Accepted: 09/20/2021] [Indexed: 12/25/2022]
Abstract
Carbon nanomaterials, due to their catalytic activity and high surface area, have potential as cell immobilization supports to increase the production of xylanase. Recombinant Kluyveromyces lactis used for xylanase production was integrated into a polymeric gel network with carbon nanomaterials. Carbon nanomaterials were pretreated before cell immobilization with hydrochloric acid (HCl) treatment and glutaraldehyde (GA) crosslinking, which contributes to cell immobilization performance. Carbon nanotubes (CNTs) and graphene oxide (GO) were further screened using a Plackett-Burman experimental design. Cell loading and agar concentration were the most important factors in xylanase production with low cell leakage. Under optimized conditions, xylanase production was increased by more than 400% compared to free cells. Immobilized cell material containing such high cell densities may exhibit new and unexplored beneficial properties because the cells comprise a large fraction of the component. The use of carbon nanomaterials as a cell immobilization support along with the entrapment method successfully enhances the production of xylanase, providing a new route to improved bioprocessing, particularly for the production of enzymes. KEY POINTS: • Carbon nanomaterials (CNTs, GO) have potential as cell immobilization supports. • Entrapment in a polymeric gel network provides space for xylanase production. • Plackett-Burman design screen for the most important factor for cell immobilization.
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Affiliation(s)
- Shoriya Aruni Abdul Manaf
- Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn Malaysia, 84600, Pagoh, Muar, Johor, Malaysia
| | - Siti Fatimah Zaharah Mohamad Fuzi
- Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn Malaysia, 84600, Pagoh, Muar, Johor, Malaysia. .,Oasis Integrated Group, Institute for Integrated Engineering, Universiti Tun Hussein Onn Malaysia, 86400, Parit Raja, Johor, Malaysia.
| | - Kheng Oon Low
- Malaysia Genome Institute, National Institute of Biotechnology Malaysia, Jalan Bangi, 43000, Kajang, Selangor, Malaysia
| | - Gurumurthy Hegde
- Centre for Nano-Materials and Displays, B.M.S. College of Engineering, Bull Temple Road, Basavanagudi, 560019, Bangalore, India
| | - Nor Hasmaliana Abdul Manas
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Rosli Md Illias
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia
| | - Kim Seng Chia
- Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia, 86400, Batu Pahat, Johor, Malaysia
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5
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Nanocarriers-based immobilization of enzymes for industrial application. 3 Biotech 2021; 11:427. [PMID: 34603907 DOI: 10.1007/s13205-021-02953-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 07/28/2021] [Indexed: 10/20/2022] Open
Abstract
Nanocarriers-based immobilization strategies are a novel concept in the enhancement of enzyme stability, shelf life and efficiency. A wide range of natural and artificial supports have been assessed for their efficacy in enzyme immobilization. Nanomaterials epitomize unique and fascinating matrices for enzyme immobilization. These structures include carbon nanotubes, superparamagnetic nanoparticles and nanofibers. These nano-based supports offer stable attachment of enzymes, thus ensuring their reusability in diverse industrial applications. This review attempts to encompass recent developments in the critical role played by nanotechnology towards the improvement of the practical applicability of microbial enzymes. Nanoparticles are increasingly being used in combination with various polymers to facilitate enzyme immobilization. These endeavors are proving to be conducive for enzyme-catalyzed industrial operations. In recent years the diversity of nanomaterials has grown tremendously, thus offering endless opportunities in the form of novel combinations for various biotransformation experimentations. These nanocarriers are advantageous for both free enzymes and whole-cell immobilization, thus demonstrating to be relatively effective in several fermentation procedures.
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Sahu R, Meghavarnam AK, Janakiraman S. Evaluation of acrylamide production by Rhodococcus rhodochrous (RS-6) cells immobilized in agar matrix. J Appl Microbiol 2021; 132:1978-1989. [PMID: 34564923 DOI: 10.1111/jam.15303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 09/03/2021] [Accepted: 09/10/2021] [Indexed: 11/29/2022]
Abstract
AIMS The efficiency of acrylamide production was examined with immobilized cells of Rhodococcus rhodochrous (RS-6) containing NHase. METHODS AND RESULTS Different entrapment matrices such as agar, alginate and polyacrylamide were used. Various immobilization parameters like agar concentration, cell concentration and reaction conditions affecting the bioconversion process using suitable matrices were determined. The cells immobilized with agar matrix were found to be most effective for acrylonitrile conversion. The bioconversion was more efficient in beads prepared with 2% agar and 5% (v/v) cell concentration. The entire conversion of acrylonitrile to acrylamide with agar entrapped cells was achieved in 120 min at 15°C. The agar entrapped R. rhodochrous (RS-6) cells exhibited 8% (w/v) tolerance to acrylonitrile and 35% tolerance to acrylamide. The immobilized cells also retained 50% of its conversion ability up to seven cycles. The laboratory-scale (1 L) production resulted in 466 g L-1 accumulation of acrylamide in 16 h. CONCLUSIONS The cells immobilized in agar showed better stability and biocatalytic properties and increased reusability potential. SIGNIFICANCE AND IMPACT OF THE STUDY The agar-immobilized Rhodococcus rhodochrous (RS-6) cells showed enhanced tolerance for both the substrate and product and is economical for the large-scale production of acrylamide.
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Affiliation(s)
- Ruchi Sahu
- Department of Microbiology and Biotechnology, Bangalore University, Bangalore, India
| | | | - Savitha Janakiraman
- Department of Microbiology and Biotechnology, Bangalore University, Bangalore, India
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Nie H, Nie M, Diwu Z, Wang L, Yan H, Bai X. Immobilization of Rhodococcus qingshengii strain FF on the surface of polyethylene and its adsorption and biodegradation of mimic produced water. JOURNAL OF HAZARDOUS MATERIALS 2021; 403:124075. [PMID: 33265063 DOI: 10.1016/j.jhazmat.2020.124075] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 08/06/2020] [Accepted: 09/21/2020] [Indexed: 06/12/2023]
Abstract
Low pH and high salinity characteristic of produced water (PW) posed a big challenge for the direct biological treatment. The immobilization of R. qingshengii strain FF, which degraded petroleum effectively under low pH, and application of immobilized R. qingshengii strain FF in treating mimic PW was studied in this work. The immobilization of R. qingshengii strain FF on the surface of polyethylene foam (PEF), one type of waste packaging materials, was optimized using the response surface methodology. Under optimum conditions, cell density of R. qingshengii strain FF immobilized on the surface of PEF reached 388 mg (cells)/g(PEF). In addition, a few factors, including hydraulic retention time (HRT), pH and salinity, were studied for treating mimic PW using immobilized R. qingshengii strain FF. The result of this study demonstrated that TPH degradation efficiency of PW by immobilized R. qingshengii strain FF reached above 90% when HRT was longer than 8 h. Weak acid and high salinity conditions only moderately decreased TPH. Asphalt, alkanes and aromatic hydrocarbon contained in petroleum can be degraded to some extent. These results indicated that immobilized R. qingshengii strain FF can be used as a highly efficient strain which could be used in biological treatment of real PW.
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Affiliation(s)
- Hongyun Nie
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, Shaanxi Province The People's Republic of China; Key Laboratory of Membrane Separation of Shaanxi Province, No. 13 Yanta Road, Xi'an 710055, Shaanxi Province The People's Republic of China
| | - Maiqian Nie
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, Shaanxi Province The People's Republic of China; Key Laboratory of Membrane Separation of Shaanxi Province, No. 13 Yanta Road, Xi'an 710055, Shaanxi Province The People's Republic of China.
| | - Zhenjun Diwu
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, Shaanxi Province The People's Republic of China; Key Laboratory of Membrane Separation of Shaanxi Province, No. 13 Yanta Road, Xi'an 710055, Shaanxi Province The People's Republic of China.
| | - Lei Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, Shaanxi Province The People's Republic of China; Key Laboratory of Membrane Separation of Shaanxi Province, No. 13 Yanta Road, Xi'an 710055, Shaanxi Province The People's Republic of China
| | - Han Yan
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, Shaanxi Province The People's Republic of China
| | - Xuerui Bai
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, Shaanxi Province The People's Republic of China
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Singh P, Kumari A, Chauhan K, Attri C, Seth A. Nitrile hydratase mediated green synthesis of lactamide by immobilizing Rhodococcus pyridinivorans NIT-36 cells on N, N'-Methylene bis-acrylamide activated chitosan. Int J Biol Macromol 2020; 161:168-176. [PMID: 32512095 DOI: 10.1016/j.ijbiomac.2020.06.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/23/2020] [Accepted: 06/01/2020] [Indexed: 10/24/2022]
Abstract
In this paper green synthesis of an important commodity chemical lactamide has been undertaken using chitosan immobilized Rhodococcus pyridinivorans NIT-36 harbouring nitrile hydratase (NHase) enzyme. The cells immobilization (300 mg/g) is based on the partial entrapment of cells by suspension cross-linking technique facilitated by N, N'-Methylene bis-acrylamide. In the repeated-use experiments, the immobilized cells retained 80% of its initial activity when stored at 4 °C for 30 days. NHase activity of free and immobilized cells was studied over temperature ranging from 25 °C to 60 °C. The activity for free cells showed a sharp decline of 70% when the reaction temperature was elevated from 45 °C to 50 °C whereas chitosan immobilized cells retained their activity in the same temperature range. A fed-batch reaction was designed and the immobilized cells showed 100% similar enzymatic pattern for five consecutive rounds which gradually decreased in following cycles. A volumetric productivity of 20 g/L and catalytic productivity of 8.33 g/g dcw/h for lactamide were achieved.
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Affiliation(s)
- Poonam Singh
- Faculty of Applied Sciences and Biotechnology, Shoolini University, Bajhol, Solan (H.P.), India
| | - Ansu Kumari
- Faculty of Applied Sciences and Biotechnology, Shoolini University, Bajhol, Solan (H.P.), India
| | - Kalpana Chauhan
- Department of Chemistry, School of Engineering and Technology, Central University of Haryana, Mahendergarh, Haryana, India
| | - Chandrika Attri
- Faculty of Applied Sciences and Biotechnology, Shoolini University, Bajhol, Solan (H.P.), India
| | - Amit Seth
- Department of Life Sciences (Botany), Manipur University, Imphal, Manipur, India.
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9
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Shen JD, Cai X, Liu ZQ, Zheng YG. Nitrilase: a promising biocatalyst in industrial applications for green chemistry. Crit Rev Biotechnol 2020; 41:72-93. [PMID: 33045860 DOI: 10.1080/07388551.2020.1827367] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Nitrilases are widely distributed in nature and are able to hydrolyze nitriles into their corresponding carboxylic acids and ammonia. In industry, nitrilases have been used as green biocatalysts for the production of high value-added products. To date, biocatalysts are considered to be important alternatives to chemical catalysts due to increasing environmental problems and resource scarcity. This review provides an overview of recent advances of nitrilases in aspects of distribution, enzyme screening, molecular structure and catalytic mechanism, protein engineering, and their potential applications in industry.
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Affiliation(s)
- Ji-Dong Shen
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, P. R. China.,Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou, P.R. China
| | - Xue Cai
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, P. R. China.,Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou, P.R. China
| | - Zhi-Qiang Liu
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, P. R. China.,Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou, P.R. China
| | - Yu-Guo Zheng
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, P. R. China.,Engineering Research Center of Bioconversion and Biopurification of Ministry of Education, Zhejiang University of Technology, Hangzhou, P.R. China
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10
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Abdul Manaf SA, Mohamad Fuzi SFZ, Abdul Manas NH, Md Illias R, Low KO, Hegde G, Che Man R, Wan Azelee NI, Matias-Peralta HM. Emergence of nanomaterials as potential immobilization supports for whole cell biocatalysts and cell toxicity effects. Biotechnol Appl Biochem 2020; 68:1128-1138. [PMID: 32969042 DOI: 10.1002/bab.2034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 09/12/2020] [Indexed: 12/21/2022]
Abstract
The traditional approach of fermentation by a free cell system has limitations of low productivity and product separation that need to be addressed for production enhancement and cost effectiveness. One of potential methods to solve the problems is cell immobilization. Microbial cell immobilization allows more efficient up-scaling by reducing the nonproductive growth phase, improving product yield and simplifying product separation. Furthermore, the emergence of nanomaterials such as carbon nanotubes, graphene, and metal-based nanomaterials with excellent functional properties provides novel supports for cell immobilization. Nanomaterials have catalytic properties that can provide specific binding site with targeted cells. However, the toxicity of nanomaterials towards cells has hampered its application as it affects the biological system of the cells, which cannot be neglected in any way. This gray area in immobilization is an important concern that needs to be addressed and understood by researchers. This review paper discusses an overview of nanomaterials used for cell immobilization with special focus on its toxicological challenges and how by understanding physicochemical properties of nanomaterials could influence the toxicity and biocompatibility of the cells.
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Affiliation(s)
- Shoriya Aruni Abdul Manaf
- Department of Technology and Natural Resources, Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia
| | - Siti Fatimah Zaharah Mohamad Fuzi
- Department of Technology and Natural Resources, Faculty of Applied Sciences and Technology, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia
| | - Nor Hasmaliana Abdul Manas
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor, Malasiya.,Institute of Bioproduct Development, Universiti Teknologi Malaysia, Johor, Malaysia
| | - Rosli Md Illias
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor, Malasiya
| | | | - Gurumurthy Hegde
- Centre for Nanomaterials and Displays, BMS College of Engineering, Bangalore, India
| | - Rohaida Che Man
- Faculty of Chemical and Natural Resources Engineering, Universiti Malaysia Pahang, Pahang, Malaysia
| | - Nur Izyan Wan Azelee
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor, Malasiya.,Institute of Bioproduct Development, Universiti Teknologi Malaysia, Johor, Malaysia
| | - Hazel Monica Matias-Peralta
- Freshwater Aquaculture Center-College of Fisheries, Central Luzon State University, Nueva Ecija, Philippines
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Xu Z, Huang JW, Xia CJ, Zou SP, Xue YP, Zheng YG. Enhanced catalytic stability and reusability of nitrilase encapsulated in ethyleneamine-mediated biosilica for regioselective hydrolysis of 1-cyanocycloalkaneacetonitrile. Int J Biol Macromol 2019; 130:117-124. [DOI: 10.1016/j.ijbiomac.2019.02.131] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 02/22/2019] [Accepted: 02/22/2019] [Indexed: 01/08/2023]
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12
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Jamwal S, Dautoo UK, Ranote S, Dharela R, Chauhan GS. Enhanced catalytic activity of new acryloyl crosslinked cellulose dialdehyde-nitrilase Schiff base and its reduced form for nitrile hydrolysis. Int J Biol Macromol 2019; 131:117-126. [DOI: 10.1016/j.ijbiomac.2019.03.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 02/28/2019] [Accepted: 03/04/2019] [Indexed: 12/27/2022]
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13
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Carmona-Orozco ML, Panay AJ. Immobilization of E. coli expressing Bacillus pumilus CynD in three organic polymer matrices. Appl Microbiol Biotechnol 2019; 103:5401-5410. [PMID: 31065754 DOI: 10.1007/s00253-019-09859-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 04/12/2019] [Accepted: 04/15/2019] [Indexed: 11/24/2022]
Abstract
Cyanide is toxic to most living organisms. The toxicity of cyanide derives from its ability to inhibit the enzyme cytochrome C oxidase of the electronic transport chain. Despite its high toxicity, several industrial processes rely on the use of cyanide, and considerable amounts of industrial waste must be adequately treated before discharge. Biological treatments for the decontamination of cyanide waste include the use of microorganisms and enzymes. Regarding the use of enzymes, cyanide dihydratase (CynD), which catalyzes the conversion of cyanide into ammonia and formate, is an attractive candidate. Nevertheless, the main impediment to the effective use of this enzyme for the biodegradation of cyanide is the marked intolerance to the alkaline pH at which cyanide waste is kept. In this work, we explore the operational capabilities of whole E. coli cells overexpressing Bacillus pumilus CynD immobilized in three organic polymer matrices: chitosan, polyacrylamide, and agar. Remarkably, the immobilized cells on agar and polyacrylamide retained more than 80% activity even at pH 10 and displayed high reusability. Conversely, the cells immobilized on chitosan were not active. Finally, the suitability of the active complexes for the degradation of free cyanide from a solution derived from the gold processing industry was demonstrated.
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Affiliation(s)
| | - Aram J Panay
- Faculty of Natural Sciences, Universidad Icesi, Calle 18 No 122-135, Cali, Colombia.
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14
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Chhiba-Govindjee VP, van der Westhuyzen CW, Bode ML, Brady D. Bacterial nitrilases and their regulation. Appl Microbiol Biotechnol 2019; 103:4679-4692. [DOI: 10.1007/s00253-019-09776-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 03/12/2019] [Accepted: 03/13/2019] [Indexed: 12/25/2022]
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15
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Marine psychrophile-derived cold-active polygalacturonase: Enhancement of productivity in Thalassospira frigidphilosprofundus S3BA12 by whole cell immobilization. Biochem Eng J 2019. [DOI: 10.1016/j.bej.2019.01.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Specific Immobilization of Escherichia coli Expressing Recombinant Glycerol Dehydrogenase on Mannose-Functionalized Magnetic Nanoparticles. Catalysts 2018. [DOI: 10.3390/catal9010007] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Mannose-functionalized magnetic nanoparticles were prepared for the immobilization of Escherichia coli cells harboring the recombinant glycerol dehydrogenase gene. Immobilization of whole E. coli cells on the carrier was carried out through specific binding between mannose on the nanoparticles and the FimH lectin on the E. coli cell surface via hydrogen bonds and hydrophobic interactions. The effects of various factors including cell concentration, pH, temperature, and buffer concentration were investigated. High degrees of immobilization (84%) and recovery of activity (82%) were obtained under the following conditions: cell/support 1.3 mg/mL, immobilization time 2 h, pH 8.0, temperature 4°C, and buffer concentration 50 mM. Compared with the free cells, the thermostability of the immobilized cells was improved 2.56-fold at 37 °C. More than 50% of the initial activity of the immobilized cells remained after 10 cycles. The immobilized cells were evaluated functionally by monitoring the catalytic conversion of glycerol to 1,3-dihydroxyacetone (DHA). After a 12 h reaction, the DHA produced by the immobilized cells was two-fold higher than that produced by the free cells. These results indicate that mannose-functionalized magnetic nanoparticles can be used for the specific recognition of gram-negative bacteria, which gives them great potential in applications such as the preparation of biocatalysts and biosensors and clinical diagnosis.
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