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Pattnaik S, Dash D, Mohapatra S, Pati S, Devadarshini D, Samal S, Pattnaik M, Maity S, Mishra SK, Samantaray D. Reclamation of chromium-contaminated soil by native Cr(VI)-reducing and PHA-accumulating Bacillus aryabhattai CTSI-07. Int Microbiol 2024; 27:731-742. [PMID: 37676443 DOI: 10.1007/s10123-023-00421-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 07/25/2023] [Accepted: 08/22/2023] [Indexed: 09/08/2023]
Abstract
Reclamation of chromium-contaminated soil by bacteria is a big confront concerning to soil health restoration, food safety, and environmental protection. Herein, the chromium-resistant Bacillus aryabhattai CTSI-07 (MG757377) showed resistance to 1000 and 300 ppm of Cr(VI) in nutrient rich Luria Bertani (LB) and nutrient-deficient sucrose low phosphate (SLP) medium, respectively. It reduced 96.7% of Cr(VI) from contaminated soil in the presence of 100 ppm of Mg within 96 h under optimized conditions. Furthermore, Cr(VI) reduction by the bacteria was validated by Fourier transform infrared spectroscopic (FTIR) and X-ray diffraction (XRD) analysis. Besides Cr(VI) reduction, the bacterial strain also showed plant growth promoting traits like N2 fixation and indole acetic acid (IAA) production. On the other hand, transmission electron microscopy (TEM) imaging confirmed polyhydroxyalkanoates' (PHAs) granule accumulation and 0.5 g/l of PHAs was extracted from bacterial cell using SLP medium. Infra-red (IR) spectra and proton nuclear magnetic resonance (1H NMR) chemical shift patterns established the PHAs as polyhydroxybutyrate (PHB). Melting (Tm) and thermal degradation (Td) temperature of the PHB were 169 °C and 275 °C, respectively, as evident from thermogravimetry differential thermal analysis (TG-DTA). Atomic force microscopic (AFM) imaging depicted that the PHB film surface was rough and regular. Furthermore, the multi-metal-resistant, plant growth-promoting, and PHB-producing bacteria could reduce 99.82% of Cr(VI) from contaminated soil within 120 days in pot culture. Thus, it can be used for long-term reclamation of chromium-contaminated soil to restore soil health, provide food safety, and environmental protection.
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Affiliation(s)
- Swati Pattnaik
- Department of Microbiology, OUAT, Bhubaneswar, Odisha, India
| | - Debasis Dash
- Department of Botany, OUAT, Bhubaneswar, Odisha, India
| | | | - Swayamsidha Pati
- Pilot Scale Laboratory, Coir Board Regional Office, Bhubaneswar, Odisha, India
| | | | - Swati Samal
- Department of Microbiology, OUAT, Bhubaneswar, Odisha, India
| | | | - Sudipta Maity
- BIRAC E-YUVA Center, GIET University, Gunupur, Odisha, India
| | - Sumanta K Mishra
- Department of Animal Nutrition, CVSc & AH, OUAT, Bhubaneswar, Odisha, India
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Basak S, Subramanian B, Thirumurugan R, Saleena LM. PHB Production by Bacillus megaterium LSRB 0103 Using Cornstarch and Urea. Curr Microbiol 2024; 81:139. [PMID: 38613599 DOI: 10.1007/s00284-024-03667-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 03/16/2024] [Indexed: 04/15/2024]
Abstract
Polyhydroxybutyrates (PHBs) are biopolymers that are good green alternative for synthetic carbon-based polymers, and are also one of the most researched members of the Polyhydroxyalkanoates (PHA) family. In this study, a gram-positive bacterial strain Bacillus megaterium LSRB 0103 was isolated from Pallikaranai Marshland, Chennai, India. Primary screening using Sudan Black dye revealed the presence of intracellular PHB granules. Minimal Davis Media (MDM) which was used or PHB production gave a yield of 0.7107 g/L. Subsequently, using response surface methodology (RSM), a central composite design (CCD) model was designed for media optimization having cornstarch, urea, and pH as independent variables. The findings of the CCD model were fitted into a second-order polynomial equation. The RSM model predicted the maximum PHB yield of 0.93 g/L, at these independent variable levels, cornstarch, 5 g/L; urea, 2.1 g/L; and pH 7.0; while the experimental PHB yield was 0.94 g/L, with a percentage error of 1.1%. This study is the first-time report of production of PHB by Bacillus megaterium using cornstarch and urea as substrate.
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Affiliation(s)
- Souvik Basak
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Kanchipuram, Chennai, Tamil Nadu, 603203, India
| | - Bhargavi Subramanian
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Kanchipuram, Chennai, Tamil Nadu, 603203, India
| | - Rithanya Thirumurugan
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Kanchipuram, Chennai, Tamil Nadu, 603203, India
| | - Lilly M Saleena
- Department of Biotechnology, School of Bioengineering, College of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Kanchipuram, Chennai, Tamil Nadu, 603203, India.
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Bhende PP, Chauhan R, Waigaonkar S, Bragança JM, Ganguly A. Composites of Bacillus megaterium H16 derived poly-3-hydroxybutyrate as a biomaterial for skin tissue engineering. Int J Biol Macromol 2023:125355. [PMID: 37327940 DOI: 10.1016/j.ijbiomac.2023.125355] [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: 02/03/2023] [Revised: 06/02/2023] [Accepted: 06/10/2023] [Indexed: 06/18/2023]
Abstract
Composite films of Bacillus megaterium H16 derived PHB with 1%Poly-L-lactic acid (PLLA), 1%Poly-ε-caprolactone (PCL), and 0.3 % graphene nanoplatelets (GNP) were produced by solvent cast method. The composite films were characterized by SEM, DSC-TGA, XRD, and ATR-FTIR. The ultrastructure of PHB and its composites depicted an irregular surface morphology with pores after the evaporation of chloroform. The GNPs were seen to be integrated inside the pores. The B. megaterium H16 derived-PHB and its composites demonstrated good biocompatibility which was evaluated in vitro on HaCaT and L929 cells by MTT assay. The cell viability was best for PHB followed by PHB/PLLA/PCL > PHB/PLLA/GNP > PHB/PLLA. PHB and its composites were highly hemocompatible as it resulted in <1 % hemolysis. The PHB/PLLA/PCL and PHB/PLLA/GNP composites can serve as ideal biomaterials for skin tissue engineering.
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Affiliation(s)
- Prajakta Praveen Bhende
- Department of Biological Sciences, BITS Pilani KK Birla Goa Campus, Zuarinagar, Goa 403726, India.
| | - Rashmi Chauhan
- Department of Chemistry, BITS Pilani KK Birla Goa Campus, Zuarinagar, Goa 403726, India.
| | - Sachin Waigaonkar
- Department of Mechanical Engineering, BITS Pilani KK Birla Goa Campus, Zuarinagar, Goa 403726, India.
| | - Judith M Bragança
- Department of Biological Sciences, BITS Pilani KK Birla Goa Campus, Zuarinagar, Goa 403726, India.
| | - Anasuya Ganguly
- Department of Biological Sciences, BITS Pilani KK Birla Goa Campus, Zuarinagar, Goa 403726, India.
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Davaritouchaee M, Mosleh I, Dadmohammadi Y, Abbaspourrad A. One-Step Oxidation of Orange Peel Waste to Carbon Feedstock for Bacterial Production of Polyhydroxybutyrate. Polymers (Basel) 2023; 15:697. [PMID: 36771998 PMCID: PMC9920450 DOI: 10.3390/polym15030697] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 01/25/2023] [Accepted: 01/28/2023] [Indexed: 01/31/2023] Open
Abstract
Orange peels are an abundant food waste stream that can be converted into useful products, such as polyhydroxyalkanoates (PHAs). Limonene, however, is a key barrier to building a successful biopolymer synthesis from orange peels as it inhibits microbial growth. We designed a one-pot oxidation system that releases the sugars from orange peels while eliminating limonene through superoxide (O2• -) generated from potassium superoxide (KO2). The optimum conditions were found to be treatment with 0.05 M KO2 for 1 h, where 55% of the sugars present in orange peels were released and recovered. The orange peel sugars were then used, directly, as a carbon source for polyhydroxybutyrate (PHB) production by engineered Escherichia coli. Cell growth was improved in the presence of the orange peel liquor with 3 w/v% exhibiting 90-100% cell viability. The bacterial production of PHB using orange peel liquor led to 1.7-3.0 g/L cell dry weight and 136-393 mg (8-13 w/w%) ultra-high molecular weight PHB content (Mw of ~1900 kDa) during a 24 to 96 h fermentation period. The comprehensive thermal characterization of the isolated PHBs revealed polymeric properties similar to PHBs resulting from pure glucose or fructose. Our one-pot oxidation process for liberating sugars and eliminating inhibitory compounds is an efficient and easy method to release sugars from orange peels and eliminate limonene, or residual limonene post limonene extraction, and shows great promise for extracting sugars from other complex biomass materials.
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Affiliation(s)
| | | | | | - Alireza Abbaspourrad
- Department of Food Science, College of Agriculture & Life Sciences, Cornell University, Stocking Hall, Ithaca, New York, NY 14853, USA
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Abdelmalek F, Steinbüchel A, Rofeal M. The Hyperproduction of Polyhydroxybutyrate Using Bacillus mycoides ICRI89 through Enzymatic Hydrolysis of Affordable Cardboard. Polymers (Basel) 2022; 14:polym14142810. [PMID: 35890586 PMCID: PMC9322056 DOI: 10.3390/polym14142810] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 07/06/2022] [Accepted: 07/08/2022] [Indexed: 12/14/2022] Open
Abstract
Bioplastics are contemplated as remarkable substitutes for conventional plastics to accommodate green technological advancements. However, their industrial production has not been fully implemented owing to the cost of carbon resources. From another perspective, valorizing different paper mill wastes has become a prominent research topic. These materials may serve as an affording sustainable feedstock for bioplastic production. Adjustment of cardboard waste hydrolysate as suitable fermentation media for production of bacterial polyhydroxyalkanoates (PHAs) has been investigated. Cardboard samples were defibered and dried before enzymatic hydrolysis. The enzymatic degradation of commercial cellulase was monitored over 15 days. Interestingly, 18.2 ± 0.2 g/L glucose yield was obtained from 50 g cardboard samples using a 1.5% (v/v) enzyme concentration. The samples exhibited maximum weight loss values of 69-73%. Meanwhile, five soil samples were collected from local sites in Lodz, Poland. A total of 31 bacterial isolates were screened and cultured on Nile blue plates. Analysis of the 16S rRNA gene sequence of the most potent producer revealed 100% similarity to Bacillus mycoides. Cardboard hydrolysates whole medium, modified MSM with cardboard hydrolysate and nitrogen depleted MSM with cardboard hydrolysate were utilized for PHA production, followed by PHA productivity and cell dry weight (CDW) estimation compared to glucose as a standard carbon source. An impressive PHA accumulation of 56% CDW was attained when the waste hydrolysate was used as a carbon source. FTIR and NMR analysis of the isolated PHA indicated that functional groups of the polymer were related to PHB (polyhydroxybutyrate). Thermal analysis demonstrates that PHB and PHB-CB (PHB produced from cardboard hydrolysate) have degradation temperatures of 380 and 369 °C, respectively, which reflect the high thermal stability and heat resistance compared to the same properties for a standard polymer. This is the first demonstration of full saccharification of corrugated cardboard paper waste for high-level production of PHA. In addition, the attained PHB productivity is one of the highest levels achieved from a real lignocellulosic waste.
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Affiliation(s)
- Fady Abdelmalek
- International Center for Research on Innovative Biobased Materials (ICRI-BioM)-International Research Agenda, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland; (F.A.); (A.S.)
| | - Alexander Steinbüchel
- International Center for Research on Innovative Biobased Materials (ICRI-BioM)-International Research Agenda, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland; (F.A.); (A.S.)
| | - Marian Rofeal
- International Center for Research on Innovative Biobased Materials (ICRI-BioM)-International Research Agenda, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland; (F.A.); (A.S.)
- Department of Botany and Microbiology, Faculty of Science, Alexandria University, Moharam Bek, Alexandria 21521, Egypt
- Correspondence:
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Scale-Up Studies for Polyhydroxyalkanoate and Halocin Production by <i>Halomonas</i> Sp. as Potential Biomedical Materials. JOURNAL OF BIOMIMETICS BIOMATERIALS AND BIOMEDICAL ENGINEERING 2022. [DOI: 10.4028/p-yqf2wv] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polyhydroxyalkanoates (PHA) are the biomaterials isolated naturally from bacterial strains. These are present in granules and accumulated intracellularly for storage and energy uptake in stressed conditions. This work was based on the extraction of polyhydroxyalkanoates from haloarchaeal strains isolated from samples of a salt mine and Halocin activity screening of these isolates. For the screening of polyhydroxyalkanoates, Nile Blue and Sudan Black Staining were performed. After confirmation and theoretical determination, polyhydroxyalkanoates extraction was done by sodium hypochlorite digestion and solvent extraction by chloroform method in combination. Polyhydroxyalkanoates production was calculated along with the determination of biomass. Halocin activity of these strains was also screened at different intervals. Isolated strains were identified by 16S RNA gene sequencing. Polyhydroxyalkanoates polymer was produced in form of biofilms and brittle crystals. Halocin activity was exhibited by four strains, among which confirmed halocin activity was shown by strain K7. The remarkable results showed that polyhydroxyalkanoates can replace synthetic plastics which are not environment friendly as they cause environmental pollution – a major threat to Earth rising gradually. Therefore, by switching to the use of biodegradable bioplastics from the use of synthetic plastics, it would be beneficial to the ecosphere.
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Kacanski M, Pucher L, Peral C, Dietrich T, Neureiter M. Cell Retention as a Viable Strategy for PHA Production from Diluted VFAs with Bacillus megaterium. Bioengineering (Basel) 2022; 9:bioengineering9030122. [PMID: 35324811 PMCID: PMC8945770 DOI: 10.3390/bioengineering9030122] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 03/13/2022] [Accepted: 03/14/2022] [Indexed: 01/01/2023] Open
Abstract
The production of biodegradable and biocompatible materials such as polyhydroxyalkanoates (PHAs) from waste-derived volatile fatty acids (VFAs) is a promising approach towards implementing a circular bioeconomy. However, VFA solutions obtained via acidification of organic wastes are usually too diluted for direct use in standard batch or fed-batch processes. To overcome these constraints, this study introduces a cell recycle fed-batch system using Bacillus megaterium uyuni S29 for poly(3-hydroxybutyrate) (P3HB) production from acetic acid. The concentrations of dry cell weight (DCW), P3HB, acetate, as well as nitrogen as the limiting substrate component, were monitored during the process. The produced polymer was characterized in terms of molecular weight and thermal properties after extraction with hypochlorite. The results show that an indirect pH-stat feeding regime successfully kept the strain fed without prompting inhibition, resulting in a dry cell weight concentration of up to 19.05 g/L containing 70.21% PHA. After appropriate adaptations the presented process could contribute to an efficient and sustainable production of biopolymers.
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Affiliation(s)
- Milos Kacanski
- Department of Agrobiotechnology, Institute of Environmental Biotechnology, University of Natural Resources and Life Sciences, Vienna, Konrad-Lorenz-Str. 20, 3430 Tulln, Austria; (M.K.); (L.P.)
| | - Lukas Pucher
- Department of Agrobiotechnology, Institute of Environmental Biotechnology, University of Natural Resources and Life Sciences, Vienna, Konrad-Lorenz-Str. 20, 3430 Tulln, Austria; (M.K.); (L.P.)
| | - Carlota Peral
- TECNALIA, Basque Research and Technology Alliance (BRTA), Parque Tecnólogico de Álava, Leonardo Da Vinci 1, 01510 Minano, Spain; (C.P.); (T.D.)
| | - Thomas Dietrich
- TECNALIA, Basque Research and Technology Alliance (BRTA), Parque Tecnólogico de Álava, Leonardo Da Vinci 1, 01510 Minano, Spain; (C.P.); (T.D.)
| | - Markus Neureiter
- Department of Agrobiotechnology, Institute of Environmental Biotechnology, University of Natural Resources and Life Sciences, Vienna, Konrad-Lorenz-Str. 20, 3430 Tulln, Austria; (M.K.); (L.P.)
- Correspondence: ; Tel.: +43-1-47654-97441
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Chavan S, Yadav B, Tyagi RD, Drogui P. A review on production of polyhydroxyalkanoate (PHA) biopolyesters by thermophilic microbes using waste feedstocks. BIORESOURCE TECHNOLOGY 2021; 341:125900. [PMID: 34523565 DOI: 10.1016/j.biortech.2021.125900] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/31/2021] [Accepted: 09/03/2021] [Indexed: 05/26/2023]
Abstract
Polyhydroxyalkanoates (PHAs) are produced by numerous microbes as a subcellular energy source. Despite of their diverse applications, exorbitant production cost limits their commercial synthesis. Apart from various cost determining factors such as cost-effective feedstocks or economic recovery methods, the use of appropriate bacteria holds the key to reduce the fermentation economics. Extremophiles, especially thermophilic PHA producers, could make the bioprocess economically viable by reducing the production cost in several aspects. Using variety of waste feedstocks as carbon substrates could open the way for the valorisation of industrial waste streams and cost-effective PHA production. Therefore, the article critically reviews the current knowledge of the synthesis of PHA polyesters in thermophilic conditions. Additionally, it summarises several studies on thermophilic PHA producing bacteria grown on various waste substrates. To conclude, the paper focuses on screening and recovery methods as well as technical challenges in thermophilic PHA production.
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Affiliation(s)
- Shraddha Chavan
- INRS Eau, Terre et Environnement, 490, rue de la Couronne, Québec G1K 9A9, Canada
| | - Bhoomika Yadav
- INRS Eau, Terre et Environnement, 490, rue de la Couronne, Québec G1K 9A9, Canada
| | - R D Tyagi
- School of Technology, Huzhou University, China; BOSK-Bioproducts, 100-399 rue Jacquard, Québec (QC) G1N 4J6, Canada.
| | - Patrick Drogui
- INRS Eau, Terre et Environnement, 490, rue de la Couronne, Québec G1K 9A9, Canada
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The "beauty in the beast"-the multiple uses of Priestia megaterium in biotechnology. Appl Microbiol Biotechnol 2021; 105:5719-5737. [PMID: 34263356 PMCID: PMC8390425 DOI: 10.1007/s00253-021-11424-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 06/17/2021] [Accepted: 06/21/2021] [Indexed: 01/05/2023]
Abstract
Abstract Over 30 years, the Gram-positive bacterium Priestia megaterium (previously known as Bacillus megaterium) was systematically developed for biotechnological applications ranging from the production of small molecules like vitamin B12, over polymers like polyhydroxybutyrate (PHB) up to the in vivo and in vitro synthesis of multiple proteins and finally whole-cell applications. Here we describe the use of the natural vitamin B12 (cobalamin) producer P. megaterium for the elucidation of the biosynthetic pathway and the subsequent systematic knowledge-based development for production purposes. The formation of PHB, a natural product of P. megaterium and potential petro-plastic substitute, is covered and discussed. Further important biotechnological characteristics of P. megaterium for recombinant protein production including high protein secretion capacity and simple cultivation on value-added carbon sources are outlined. This includes the advanced system with almost 30 commercially available expression vectors for the intracellular and extracellular production of recombinant proteins at the g/L scale. We also revealed a novel P. megaterium transcription-translation system as a complementary and versatile biotechnological tool kit. As an impressive biotechnology application, the formation of various cytochrome P450 is also critically highlighted. Finally, whole cellular applications in plant protection are completing the overall picture of P. megaterium as a versatile giant cell factory. Key points • The use of Priestia megaterium for the biosynthesis of small molecules and recombinant proteins through to whole-cell applications is reviewed. • P. megaterium can act as a promising alternative host in biotechnological production processes.
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Comparative analysis of various extraction processes based on economy, eco-friendly, purity and recovery of polyhydroxyalkanoate: A review. Int J Biol Macromol 2021; 183:1881-1890. [PMID: 34090850 DOI: 10.1016/j.ijbiomac.2021.06.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 05/31/2021] [Accepted: 06/01/2021] [Indexed: 01/06/2023]
Abstract
Bioplastics have been an interesting area of research and development in the last few decades. Normal plastics are made out of petroleum products, which is a non-renewable resource. Apart from that, its non-biodegradable nature makes it a serious threat to the environment, and hence a better alternative is needed. Bioplastics are synthesized by microorganisms and are biodegradable; this property makes them a promising alternative to normal plastic. However, the major drawback related to bioplastic is the high cost of its production. Polyhydroxyalkanoate (PHA) is a very popular biopolymer produced by different types of microbes. The review focuses on the different methods of extraction of PHA based on the percentage of purity, recovery, eco-friendly, and cost-effectiveness. There is a wide array of extraction methods reported to date, wherein there is the involvement of different types of solvents (like halogenated, non-halogenated, and green solvents) or mechanical or enzymatic methods. Each extraction process has its advantages and disadvantages. In this study, we have attempted to present a structured comparison of these different methods and highlight the factors that can be addressed for better extraction of PHA thereby making it a feasible alternative to commercial synthetic plastic.
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Sinaei N, Zare D, Azin M. Production and characterization of poly 3-hydroxybutyrate-co-3-hydroxyvalerate in wheat starch wastewater and its potential for nanoparticle synthesis. Braz J Microbiol 2021; 52:561-573. [PMID: 33462720 PMCID: PMC8105482 DOI: 10.1007/s42770-021-00430-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Accepted: 01/08/2021] [Indexed: 10/22/2022] Open
Abstract
Polyhydroxyalkanoates (PHAs) are polymers with biodegradable and biocompatible properties accumulated in a wide variety of bacterial strains. In the present study, active sludge, wheat starch wastewater (WSW), and oil wastewater were used for the isolation and screening of PHA-accumulating bacteria. WSW was then implemented as a cheap and economical culture medium for the production of PHAs by the selected isolate. The extracted PHA was characterized, and the capability of produced biopolymer for preparing nanoparticles was evaluated. Based on the results, 96 different bacterial isolates were obtained, of which the strains isolated from WSW demonstrated the highest PHA-accumulation capability. The maximum PHA content of 3.07 g/l (59.50% of dry cell weight) was obtained by strain N6 in 21 h. The selected strain was identified by molecular approaches as Bacillus cereus. Afterward, the physicochemical characterization of an accumulated biopolymer was specified as a PHBV copolymer. Finally, spherical homogenous PHBV nanoparticles with a size of 137 nm were achieved. The PHBV nanoparticles showed a suitable small size and good zeta potential for medical applications. Hence, it can be concluded that isolated wild strain (B. cereus) has the potential exploitation capability for cost-effective PHBV production using the WSW.
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Affiliation(s)
- Neda Sinaei
- Department of Biotechnology, Iranian Research Organization for Science and Technology, Tehran, Iran
| | - Davood Zare
- Department of Biotechnology, Iranian Research Organization for Science and Technology, Tehran, Iran.
| | - Mehrdad Azin
- Department of Biotechnology, Iranian Research Organization for Science and Technology, Tehran, Iran
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Rami Reddy Tadi S, Dutt Ravindran S, Balakrishnan R, Sivaprakasam S. Recombinant production of poly-(3-hydroxybutyrate) by Bacillus megaterium utilizing millet bran and rapeseed meal hydrolysates. BIORESOURCE TECHNOLOGY 2021; 326:124800. [PMID: 33556706 DOI: 10.1016/j.biortech.2021.124800] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Revised: 01/25/2021] [Accepted: 01/27/2021] [Indexed: 06/12/2023]
Abstract
Fermentative poly-3-hydroxybutyrate (PHB) production is mainly limited by the cost of raw material. In this present study, low-cost feedstock viz., millet bran residue (MBRH) and rapeseed meal hydrolysates were successfully utilized for PHB production. Metabolic engineering of Bacillus megaterium by co-expression of both precursor (phbRBC) and NADPH cofactor regeneration (zwf) genes resulted in 2.67-fold enhancement in PHB accumulation compared to wild strain. Modified logistic model characterized B.megaterium growth and PHB production effectively. The kinetic analysis proved that maximum cell concentration (15.01 g.L-1) and growth-associated constant (0.22 g.g-1) were found to be higher for initial MBRH concentration (S0 = 20 g.L-1). PHB production kinetics elucidated its expression in B.megaterium was growth-associated. PHB synthesized by B.megaterium was characterized using FTIR, NMR, XRD, DSC/TGA, FESEM and the physio-chemical properties enumerated its as a potential biodegradable plastic for industrial application.
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Affiliation(s)
- Subbi Rami Reddy Tadi
- BioPAT Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Som Dutt Ravindran
- Department of Biotechnology, Manipal Institute of Technology, Manipal 576104, Karnataka, India
| | - Rengesh Balakrishnan
- Department of Pharmaceutical Technology, Mahendra Engineering College, Namakkal District 637503, Tamil Nadu, India
| | - Senthilkumar Sivaprakasam
- BioPAT Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
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Silambarasan S, Logeswari P, Sivaramakrishnan R, Pugazhendhi A, Kamaraj B, Ruiz A, Ramadoss G, Cornejo P. Polyhydroxybutyrate production from ultrasound-aided alkaline pretreated finger millet straw using Bacillus megaterium strain CAM12. BIORESOURCE TECHNOLOGY 2021; 325:124632. [PMID: 33485084 DOI: 10.1016/j.biortech.2020.124632] [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: 11/18/2020] [Revised: 12/23/2020] [Accepted: 12/24/2020] [Indexed: 06/12/2023]
Abstract
In this study, finger millet straw (FMS) was utilized for the production of Polyhydroxybutyrate (PHB) by Bacillus megaterium strain CAM12. Ultrasound-assisted alkaline (NaOH) pretreatment of FMS under optimized conditions followed by enzymatic saccharification resulted in the maximum delignification (72%), hydrolysis yield (84%), glucose yield (86%) and xylose yield (61%). The effects of different pH, temperature, incubation period, inoculum concentration, agitation speed and FMS enzymatic hydrolysates concentration were investigated to improve the PHB production. Under optimized conditions, strain CAM12 used the FMS hydrolysates as the sole carbon source for their growth and produced 8.31 g L-1 of PHB. The extracted polymer on Fourier transform infrared (FTIR), X-ray diffraction (XRD) and Nuclear magnetic resonance (NMR) analyses were confirmed to be PHB. These results suggest the potential of combined ultrasound and alkaline pretreated FMS hydrolysates as a promising feedstock for PHB production.
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Affiliation(s)
- Sivagnanam Silambarasan
- Centro de Investigación en Micorrizas y Sustentabilidad Agroambiental, CIMYSA, Universidad de La Frontera, Avenida Francisco Salazar 01145, Temuco, Chile
| | - Peter Logeswari
- Centro de Investigación en Micorrizas y Sustentabilidad Agroambiental, CIMYSA, Universidad de La Frontera, Avenida Francisco Salazar 01145, Temuco, Chile
| | - Ramachandran Sivaramakrishnan
- Laboratory of Cyanobacterial Biotechnology, Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | | | - Balu Kamaraj
- Department of Neuroscience Technology, College of Applied Medical Science in Jubail, Imam Abdulrahman Bin Faisal University, Jubail, Saudi Arabia
| | - Antonieta Ruiz
- Centro de Investigación en Micorrizas y Sustentabilidad Agroambiental, CIMYSA, Universidad de La Frontera, Avenida Francisco Salazar 01145, Temuco, Chile; Scientific and Technological Bioresource Nucleus, BIOREN-UFRO, Departamento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Avenida Francisco Salazar 01145, Temuco, Chile
| | - Govindarajan Ramadoss
- School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, India
| | - Pablo Cornejo
- Centro de Investigación en Micorrizas y Sustentabilidad Agroambiental, CIMYSA, Universidad de La Frontera, Avenida Francisco Salazar 01145, Temuco, Chile; Scientific and Technological Bioresource Nucleus, BIOREN-UFRO, Departamento de Ciencias Químicas y Recursos Naturales, Universidad de La Frontera, Avenida Francisco Salazar 01145, Temuco, Chile.
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14
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Saratale RG, Cho SK, Saratale GD, Ghodake GS, Bharagava RN, Kim DS, Nair S, Shin HS. Efficient bioconversion of sugarcane bagasse into polyhydroxybutyrate (PHB) by Lysinibacillus sp. and its characterization. BIORESOURCE TECHNOLOGY 2021; 324:124673. [PMID: 33445010 DOI: 10.1016/j.biortech.2021.124673] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 12/30/2020] [Accepted: 01/02/2021] [Indexed: 06/12/2023]
Abstract
In this study, Lysinibacillus sp. RGS was evaluated to synthesize polyhydroxybutyrate (PHB) from a broad range of pure carbon sources and residual sugars of chemically pretreated sugarcane bagasse (SCB) hydrolysates. Effects of supplementation of nutrients and various experimental variables to enhance PHB accumulation were investigated. Results of optimized parameters were identified as 48 h, 37 °C, pH 7; inoculums concentration (2.5% v/v) and shaking condition (100 rpm). Growth kinetics and bioprocess parameters of Lysinibacillus sp. using SCB hydrolysates with corn steep liquor (2%) accounted for the maximum cell growth (8.65 g/L) and PHA accumulation (61.5%) with PHB titer of (5.31 g/L) under optimal conditions. The produced biopolymer was studied by Fourier Transform Infrared (FTIR) spectroscopy and the results revealed the obtained to be PHB. Thus Lysinibaciluus sp. exhibits high potential in industrial scale manufacture of PHB using SCB as an inexpensive substrate.
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Affiliation(s)
- Rijuta Ganesh Saratale
- Research Institute of Biotechnology and Medical Converged Science, Dongguk University-Seoul, Ilsandong-gu, Goyang-si, Gyeonggido 10326, Republic of Korea
| | - Si Kyung Cho
- Department of Biological and Environmental Science, Dongguk University, Ilsandong-gu, Goyang-si, Gyonggido 10326, Republic of Korea
| | - Ganesh Dattatraya Saratale
- Department of Food Science and Biotechnology, Dongguk University-Seoul, Ilsandong-gu, Goyang-si, Gyeonggido 10326, Republic of Korea
| | - Gajanan S Ghodake
- Department of Biological and Environmental Science, Dongguk University, Ilsandong-gu, Goyang-si, Gyonggido 10326, Republic of Korea
| | - Ram Naresh Bharagava
- Department of Microbiology, Babasaheb Bhimrao Ambedkar University (A Central University), Vidya Vihar, Raebareli Road, Lucknow 226 025 (U.P.), India
| | - Dong Su Kim
- Department of Environmental Science and Engineering, Ewha Womans University, Seoul 120-750, Republic of Korea
| | - Supriya Nair
- Department of Research and Development, SRL Limited, Prime Square, S.V. Road, Goregaon (W), Mumbai 400062, Maharashtra State, India
| | - Han Seung Shin
- Department of Food Science and Biotechnology, Dongguk University-Seoul, Ilsandong-gu, Goyang-si, Gyeonggido 10326, Republic of Korea.
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15
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Hartz P, Gehl M, König L, Bernhardt R, Hannemann F. Development and application of a highly efficient CRISPR-Cas9 system for genome engineering in Bacillus megaterium. J Biotechnol 2021; 329:170-179. [PMID: 33600891 DOI: 10.1016/j.jbiotec.2021.02.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 01/11/2021] [Accepted: 02/10/2021] [Indexed: 12/26/2022]
Abstract
Bacillus megaterium has become increasingly important for the biotechnological production of valuable compounds of industrial and pharmaceutical importance. Despite recent advances in rational strain design of B. megaterium, these studies have been largely impaired by the lack of molecular tools that are not state-of-the-art for comprehensive genome engineering approaches. In the current work, we describe the adaptation of the CRISPR-Cas9 vector pJOE8999 to enable efficient genome editing in B. megaterium. Crucial modifications comprise the exchange of promoter elements and associated ribosomal binding sites as well as the implementation of a 5-fluorouracil based counterselection system to facilitate proper plasmid curing. In addition, the functionality and performance of the new CRISPR-Cas9 vector pMOE was successfully evaluated by chromosomal disruption studies of the endogenous β-galactosidase gene (BMD_2126) and demonstrated an outstanding efficiency of 100 % based on combinatorial pheno- and genotype analyses. Furthermore, pMOE was applied for the genomic deletion of a steroid esterase gene (BMD_2256) that was identified among several other candidates as the gene encoding the esterase, which prevented accumulation of pharmaceutically important glucocorticoid esters. Recombinant expression of the bacterial chloramphenicol acetyltransferase 1 gene (cat1) in the resulting esterase deficient B. megaterium strain ultimately yielded C21-acetylated as well as novel C21-esterified derivates of cortisone.
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Affiliation(s)
- Philip Hartz
- Department of Biochemistry, Saarland University, Campus Building B2.2, 66123 Saarbrücken, Germany
| | - Manuel Gehl
- Department of Biochemistry, Saarland University, Campus Building B2.2, 66123 Saarbrücken, Germany; Present address: Microbial Protein Structure Group, Max Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Strasse 10, 35043 Marburg, Germany
| | - Lisa König
- Department of Biochemistry, Saarland University, Campus Building B2.2, 66123 Saarbrücken, Germany
| | - Rita Bernhardt
- Department of Biochemistry, Saarland University, Campus Building B2.2, 66123 Saarbrücken, Germany
| | - Frank Hannemann
- Department of Biochemistry, Saarland University, Campus Building B2.2, 66123 Saarbrücken, Germany.
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16
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Schmid M, Raschbauer M, Song H, Bauer C, Neureiter M. Effects of nutrient and oxygen limitation, salinity and type of salt on the accumulation of poly(3-hydroxybutyrate) in Bacillus megaterium uyuni S29 with sucrose as a carbon source. N Biotechnol 2020; 61:137-144. [PMID: 33278638 DOI: 10.1016/j.nbt.2020.11.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 11/25/2020] [Accepted: 11/28/2020] [Indexed: 12/12/2022]
Abstract
Due to high manufacturing costs, industrial production and application of bio-based polyhydroxyalkanoates (PHA) as bioplastics remain below the expected potential. Improving yields and productivities during biotechnological production will contribute to eliminating existing shortcomings and should therefore be a priority in process development with new strains and substrates. The present study investigates key parameters such as different nutrient and oxygen limitation strategies and the salinity and type of salt to determine their impact on growth and poly(3-hydroxybutyrate) (P(3HB)) formation behaviour of Bacillus megaterium. The oxygen-limiting conditions applied resulted in a longer process duration and were found to be least effective with regard to P(3HB) content in the biomass. A higher P(3HB) content of 0.42 g g-1 was achieved when nitrogen was limited compared to 0.34 g g-1 under phosphate-limiting conditions; however, sucrose utilization was better when phosphate was limited. Replacing NaCl by KCl and evaluating different concentrations ranging from 0.08 to 1.7 mol L-1 in the process medium showed that B. megaterium has a higher tolerance to KCl as the biomass and P(3HB) formation was increased to 0.48 g g-1 compared to 0.36 g g-1. The combination of applying KCl instead of NaCl together with phosphorous limitation significantly increased P(3HB) productivity to 0.25 g L-1 h-1 compared to 0.09 g L-1 h-1. It can be concluded that the effective utilization of sucrose as a carbon source requires a combination of high nitrogen and low phosphorous concentration and a salt content of 0.6 g L-1 KCl for P(3HB) production with B. megaterium uyuni S29.
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Affiliation(s)
- Maximilian Schmid
- University of Natural Resources and Life Sciences, Vienna, Institute of Environmental Biotechnology, Tulln an der Donau, Austria
| | - Michaela Raschbauer
- University of Natural Resources and Life Sciences, Vienna, Institute of Environmental Biotechnology, Tulln an der Donau, Austria
| | - Hyunjeong Song
- University of Natural Resources and Life Sciences, Vienna, Institute of Environmental Biotechnology, Tulln an der Donau, Austria
| | - Cornelia Bauer
- University of Natural Resources and Life Sciences, Vienna, Institute of Environmental Biotechnology, Tulln an der Donau, Austria
| | - Markus Neureiter
- University of Natural Resources and Life Sciences, Vienna, Institute of Environmental Biotechnology, Tulln an der Donau, Austria.
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17
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Akdoğan M, Çelik E. Enhanced production of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) biopolymer by recombinant Bacillus megaterium in fed-batch bioreactors. Bioprocess Biosyst Eng 2020; 44:403-416. [PMID: 32995978 DOI: 10.1007/s00449-020-02452-z] [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: 07/16/2020] [Accepted: 09/17/2020] [Indexed: 12/28/2022]
Abstract
Polyhydroxyalkanoates (PHAs) are biodegradable polyesters accumulated in a wide variety of microorganisms as intracellular carbon and energy storage compounds. Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is one of the most valuable biopolymers because of its superior mechanical properties. Here, we developed a bioprocess utilizing recombinant Bacillus megaterium strain for PHBV over-production from glucose, without any precursor addition. PHA production was performed in a controlled bioreactor by batch and fed-batch modes using wild-type B. megaterium and rec-B. megaterium cells overexpressing the native phaC gene. The effect of oxygen transfer rate on biomass formation and PHA accumulation was also investigated, under different dissolved oxygen levels. Structural and thermal properties of PHA were characterized by GC-FID, 1H-NMR, TGA and DSC analyses. Significantly, the copolymer produced from glucose as the carbon source in rec-B. megaterium was composed of 58 mol% of 3-hydroxyvalerate monomers. After 66 h, rec-B. megaterium cells in fed-batch fermentation with a pre-determined growth rate µ0 = 0.1 h-1 produced the highest CDW (7.7 g L-1) and PHA concentration (6.1 g L-1). Moreover, an exponential glucose feeding profile resulted in 2.2-fold increase in PHA yield compared to batch cultivation. Overall, this study paves the way to an enhanced biopolymer production process in B. megaterium cells, where the highest product yield on cell was obtained as YP/X = 0.8 g g-1.
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Affiliation(s)
- Murat Akdoğan
- Department of Chemical Engineering, Hacettepe University, Beytepe, 06800, Ankara, Turkey
| | - Eda Çelik
- Department of Chemical Engineering, Hacettepe University, Beytepe, 06800, Ankara, Turkey. .,Institute of Science, Bioengineering Division, Hacettepe University, Beytepe, 06800, Ankara, Turkey.
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18
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Pati S, Maity S, Dash A, Jema S, Mohapatra S, Das S, Samantaray DP. Biocompatible PHB Production from Bacillus Species Under Submerged and Solid-State Fermentation and Extraction Through Different Downstream Processing. Curr Microbiol 2020; 77:1203-1209. [DOI: 10.1007/s00284-020-01922-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 02/13/2020] [Indexed: 01/27/2023]
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19
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Polyhydroxyalkanoate (PHA) biosynthesis from directly valorized ragi husk and sesame oil cake by Bacillus megaterium strain Ti3: Statistical optimization and characterization. Int J Biol Macromol 2020; 148:20-30. [PMID: 31926923 DOI: 10.1016/j.ijbiomac.2020.01.082] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 01/08/2020] [Accepted: 01/08/2020] [Indexed: 11/23/2022]
Abstract
Polyhydroxyalkanoates (PHAs) signify the most promising biological substitute to petrochemical plastics. Renewable and inexpensive agro-industrial by-products can be used as potent fermentation feedstocks for sustainable PHA biosynthesis. This study aimed at using a wild type B. megaterium strain Ti3 innate hydrolytic enzyme/s for eco-friendly valorization of 16 lignocellulosic agrowastes to PHA without pretreatments. Initial hydrolytic screening PHA concentration of (0.04-0.17 g/L), highlighted the strain's metabolic versatility. Pareto ranking of Taguchi orthogonal array (TOA) established ragi husk (RH), sesame oil cake (SOC) and KH2PO4 as the most influential factors (p < 0.05). The optimized and validated Response surface methodology (RSM) model (R2, 0.979; desirability, 1) resulted in 3.8 and 3.6 fold increased PHA production, 4.3 and 3.25 fold increased PHA productivity. A positive correlation (r2, 0.5-0.97) was observed amid the producer innate hydrolytic enzymes (lipase, amylase and cellulase) and PHA production. The PHA was characterized by 1H and 13C NMR, GPC, TGA. The polymer was identified as a scl-mcl copolyester with 92% 3HB (3-hydroxybutyrate) and 8% 3HHp (3-hydroxyheptanoate) monomers by NMR. This the first report on B. megaterium self-enzyme reliant non-food agrowastes bioconversion to PHA with 3HHp (3-hydroxyheptanoate) monomers excluding precursor addition, commercial enzymes, pure carbon and nitrogen sources.
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20
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Utilization of desugarized sugar beet molasses for the production of poly(3-hydroxybutyrate) by halophilic Bacillus megaterium uyuni S29. Process Biochem 2019. [DOI: 10.1016/j.procbio.2019.08.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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Antimicrobial PHAs coatings for solid and porous tantalum implants. Colloids Surf B Biointerfaces 2019; 182:110317. [PMID: 31323450 DOI: 10.1016/j.colsurfb.2019.06.047] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 06/19/2019] [Accepted: 06/20/2019] [Indexed: 10/26/2022]
Abstract
Biomaterial-associated infections (BAI) are the major cause of failure of indwelling medical devices. The risk of BAI can end dramatically in the surgical removal of the affected device. Therefore, a major effort must be undertaken to guarantee the permanence of the implant. In this regard, we have developed antimicrobial coatings for tantalum (Ta) implants, using polyhydroxyalkanoates (PHAs) as matrices for carrying an active principle. The dip-coating technique was successfully used for covering solid Ta discs. An original PHA emulsion flow process was developed for the coating of porous Ta structures, specially for the inner surfaces. The complete characterization of the biopolymer coatings, their antibacterial properties, toxicity and biointegration were analyzed. Thus, non-toxic, well-biointegrated homogeneous biopolymer coatings were attained, which showed antibacterial properties. By using biodegradable PHAs, the resulting drug delivery system assured the protection of Ta against bacterial infections for a period of time.
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22
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Ponnusamy S, Viswanathan S, Periyasamy A, Rajaiah S. Production and characterization of PHB‐HV copolymer byBacillus thuringiensisisolated fromEisenia foetida. Biotechnol Appl Biochem 2019; 66:340-352. [DOI: 10.1002/bab.1730] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 01/15/2019] [Indexed: 01/23/2023]
Affiliation(s)
- Suguna Ponnusamy
- DBT‐BIF CentreDepartment of BiotechnologyLady Doak College Madurai India
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23
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Alves MI, Macagnan KL, Piecha CR, Torres MM, Perez IA, Kesserlingh SM, Rodrigues RDS, de Oliveira PD, Moreira ADS. Optimization of Ralstonia solanacearum cell growth using a central composite rotational design for the P(3HB) production: Effect of agitation and aeration. PLoS One 2019; 14:e0211211. [PMID: 30695062 PMCID: PMC6350987 DOI: 10.1371/journal.pone.0211211] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 01/09/2019] [Indexed: 11/20/2022] Open
Abstract
The intracellular accumulation of polyhydroxyalkanoates (PHAs) normally occurs after cell growth, during the second fermentation stage and under nutrient-limited conditions in the presence of a carbon excess. However, some microorganisms are able to accumulate PHAs as poly(3-hydroxybutyrate) [P(3HB)] during the first fermentation stage, the cell growth phase, without nutrient limitation, once they have been reported to utilize type II metabolism during the polymer accumulation phase. This study evaluated the effect of aeration and agitation on cell growth and P(3HB) accumulation in Ralstonia solanacearum RS, performed in a bioreactor for 24h at 32°C. A 22 central composite rotational design (CCRD) was used, with agitation (150 to 250 rpm) and aeration (0.3 to 1 vvm) as independent variables and optical density (OD600nm), dry cell weight (DCW), and P(3HB) yield as dependent variables. A significant polymer accumulation, until 70% of P(3HB), was observed, proving that R. solanacearum RS exhibited metabolism type II, regardless of the aeration process. The best results were obtained for 1 vvm and 250 rpm (+1, +1), with values of OD600nm (18.04) and DCW (4.82 g.L-1).
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Affiliation(s)
- Mariane Igansi Alves
- Department of Food Science and Technology, Eliseu Maciel Faculty of Agronomy, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - Karine Laste Macagnan
- Technological Development Center, Biotechnology, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - Camila Rios Piecha
- Technological Development Center, Biotechnology, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - Matheus Marques Torres
- Technological Development Center, Biotechnology, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - Izadora Almeida Perez
- Center for Chemical, Pharmaceutical and Food Science, University Federal of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | | | - Rosane da Silva Rodrigues
- Center for Chemical, Pharmaceutical and Food Science, University Federal of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - Patrícia Diaz de Oliveira
- Department of Food Science and Technology, Eliseu Maciel Faculty of Agronomy, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
- Center for Chemical, Pharmaceutical and Food Science, University Federal of Pelotas, Pelotas, Rio Grande do Sul, Brazil
| | - Angelita da Silveira Moreira
- Department of Food Science and Technology, Eliseu Maciel Faculty of Agronomy, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
- Technological Development Center, Biotechnology, Federal University of Pelotas, Pelotas, Rio Grande do Sul, Brazil
- Center for Chemical, Pharmaceutical and Food Science, University Federal of Pelotas, Pelotas, Rio Grande do Sul, Brazil
- * E-mail:
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24
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Cristea A, Baricz A, Leopold N, Floare C, Borodi G, Kacso I, Tripon S, Bulzu P, Andrei A, Cadar O, Levei E, Banciu H. Polyhydroxybutyrate production by an extremely halotolerant
Halomonas elongata
strain isolated from the hypersaline meromictic Fără Fund Lake (Transylvanian Basin, Romania). J Appl Microbiol 2018; 125:1343-1357. [DOI: 10.1111/jam.14029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 06/11/2018] [Accepted: 06/18/2018] [Indexed: 11/27/2022]
Affiliation(s)
- A. Cristea
- Department of Molecular Biology and Biotechnology, Faculty of Biology and Geology Babeş‐Bolyai University Cluj‐Napoca Romania
- Molecular Biology Center, Institute for Interdisciplinary Research in Bio‐Nano‐Sciences Babeş‐Bolyai University Cluj‐Napoca Romania
| | - A. Baricz
- Department of Molecular Biology and Biotechnology, Faculty of Biology and Geology Babeş‐Bolyai University Cluj‐Napoca Romania
- Department of Experimental Biology and Biochemistry National Institute of Research and Development for Biological Sciences, Institute of Biological Research Cluj‐Napoca Romania
| | - N. Leopold
- Department of Biomolecular Physics, Faculty of Physics Babeș‐Bolyai University Cluj‐Napoca Romania
| | - C.G. Floare
- Department of Biomolecular and Molecular Physics National Institute for Research and Development of Isotopic and Molecular Technologies Cluj‐Napoca Romania
| | - G. Borodi
- Department of Biomolecular and Molecular Physics National Institute for Research and Development of Isotopic and Molecular Technologies Cluj‐Napoca Romania
| | - I. Kacso
- Department of Biomolecular and Molecular Physics National Institute for Research and Development of Isotopic and Molecular Technologies Cluj‐Napoca Romania
| | - S. Tripon
- Electron Microscopy Center Babeș‐Bolyai University Cluj‐Napoca Romania
| | - P.A. Bulzu
- Department of Molecular Biology and Biotechnology, Faculty of Biology and Geology Babeş‐Bolyai University Cluj‐Napoca Romania
- Molecular Biology Center, Institute for Interdisciplinary Research in Bio‐Nano‐Sciences Babeş‐Bolyai University Cluj‐Napoca Romania
| | - A.‐Ș. Andrei
- Department of Molecular Biology and Biotechnology, Faculty of Biology and Geology Babeş‐Bolyai University Cluj‐Napoca Romania
- Department of Aquatic Microbial Ecology Institute of Hydrobiology, Biology Center of the Academy of Sciences of the Czech Republic České Budějovice Czech Republic
| | - O. Cadar
- INCDO‐INOE 2000 Research Institute for Analytical Instrumentation Cluj‐Napoca Romania
| | - E.A. Levei
- INCDO‐INOE 2000 Research Institute for Analytical Instrumentation Cluj‐Napoca Romania
| | - H.L. Banciu
- Department of Molecular Biology and Biotechnology, Faculty of Biology and Geology Babeş‐Bolyai University Cluj‐Napoca Romania
- Molecular Biology Center, Institute for Interdisciplinary Research in Bio‐Nano‐Sciences Babeş‐Bolyai University Cluj‐Napoca Romania
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25
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Involvement of polyhydroxyalkanoates in stress resistance of microbial cells: Biotechnological consequences and applications. Biotechnol Adv 2018; 36:856-870. [DOI: 10.1016/j.biotechadv.2017.12.006] [Citation(s) in RCA: 122] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 11/24/2017] [Accepted: 12/12/2017] [Indexed: 01/30/2023]
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26
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Mohapatra S, Maity S, Dash HR, Das S, Pattnaik S, Rath CC, Samantaray D. Bacillus and biopolymer: Prospects and challenges. Biochem Biophys Rep 2017; 12:206-213. [PMID: 29090283 PMCID: PMC5651552 DOI: 10.1016/j.bbrep.2017.10.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 10/03/2017] [Accepted: 10/06/2017] [Indexed: 01/27/2023] Open
Abstract
The microbially derived polyhydroxyalkanoates biopolymers could impact the global climate scenario by replacing the conventional non-degradable, petrochemical-based polymer. The biogenesis, characterization and properties of PHAs by Bacillus species using renewable substrates have been elaborated by many for their wide applications. On the other hand Bacillus species are advantageous over other bacteria due to their abundance even in extreme ecological conditions, higher growth rates even on cheap substrates, higher PHAs production ability, and the ease of extracting the PHAs. Bacillus species possess hydrolytic enzymes that can be exploited for economical PHAs production. This review summarizes the recent trends in both non-growth and growth associated PHAs production by Bacillus species which may provide direction leading to future research towards this growing quest for biodegradable plastics, one more critical step ahead towards sustainable development.
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Affiliation(s)
- Swati Mohapatra
- Department of Biotechnology, Indian Institute of Technology, Roorkee 247667, India
| | - Sudipta Maity
- Department of Microbiology, CPGS, OUAT, Bhubaneswar-3, Odisha, India
| | - Hirak Ranjan Dash
- Department of Life Science, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Surajit Das
- Department of Life Science, National Institute of Technology, Rourkela 769008, Odisha, India
| | - Swati Pattnaik
- Department of Microbiology, CPGS, OUAT, Bhubaneswar-3, Odisha, India
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Stanley A, Punil Kumar HN, Mutturi S, Vijayendra SVN. Fed-Batch Strategies for Production of PHA Using a Native Isolate of Halomonas venusta KT832796 Strain. Appl Biochem Biotechnol 2017; 184:935-952. [PMID: 28918584 DOI: 10.1007/s12010-017-2601-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Accepted: 09/08/2017] [Indexed: 10/18/2022]
Abstract
In this study, polyhydroxyalkanoates (PHA) accumulation by Halomonas venusta KT832796, a moderate halophilic bacteria isolated from marine source was studied. Both nutritional requirements and process parameters for submerged cultivation of the organism in bioreactor have been standardized. From the shake flask studies, glucose and ammonium citrate as carbon and nitrogen source produced maximum PHA at a ratio 20 with 3.52 g/L of dry cell weight and 70.56% of PHA content. However, ammonium sulfate as the nitrogen source was found to be more suitable for fed-batch cultivation. Several feeding strategies including pH-based fed-batch and variants of pulse feeding were studied to improve the PHA levels. pH-based feeding, although improved PHA level to 26 g/L, most of the carbon flux was diverted towards biomass formation; hence, the percent PHA was only 39.15% of the dry cell weight. Maximum PHA of 33.4 g/L, which corresponded to 88.12% of the dry cell, was obtained from high concentration single pulse method. There was a net 8.65-fold increase in PHA using this feeding strategy when compared to batch studies. According to our knowledge, this is the highest amount of PHA reported for a Halomonas venusta strain.
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Affiliation(s)
- Angelina Stanley
- Department of Microbiology and Fermentation Technology, CSIR-Central Food Technological Research Institute, Mysuru, Karnataka, 570020, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-CFTRI Campus, Mysuru, India
| | - H N Punil Kumar
- Department of Technology Scale-up, CSIR-Central Food Technological Research Institute, Mysuru, Karnataka, 570020, India
| | - Sarma Mutturi
- Department of Microbiology and Fermentation Technology, CSIR-Central Food Technological Research Institute, Mysuru, Karnataka, 570020, India. .,Academy of Scientific and Innovative Research (AcSIR), CSIR-CFTRI Campus, Mysuru, India.
| | - S V N Vijayendra
- Department of Microbiology and Fermentation Technology, CSIR-Central Food Technological Research Institute, Mysuru, Karnataka, 570020, India. .,Academy of Scientific and Innovative Research (AcSIR), CSIR-CFTRI Campus, Mysuru, India.
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Garcia-Gonzalez L, De Wever H. Valorisation of CO2-rich off-gases to biopolymers through biotechnological process. FEMS Microbiol Lett 2017; 364:4157786. [DOI: 10.1093/femsle/fnx196] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Accepted: 09/12/2017] [Indexed: 11/14/2022] Open
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Complete factorial design to adjust pH and sugar concentrations in the inoculum phase of Ralstonia solanacearum to optimize P(3HB) production. PLoS One 2017; 12:e0180563. [PMID: 28704411 PMCID: PMC5507507 DOI: 10.1371/journal.pone.0180563] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 06/16/2017] [Indexed: 11/19/2022] Open
Abstract
Poly(3-hydroxybutyrate) (P(3HB)) is a biodegradable plastic biopolymer that accumulates as lipophilic inclusions in the cytoplasm of some microorganisms. The biotechnological process by which P(3HB) is synthesized occurs in two phases. The first phase involves cell growth in a complex culture medium, while the second phase involves polymer accumulation in the presence of excess carbon sources. As such, the efficiency of the second phase depends on the first phase. The aim of this study was to evaluate culture media with different concentrations of sucrose and glucose and different pH values in the inoculum phase of Ralstonia solanacearum RS with the intention of identifying methods by which the biomass yield could be increased, subsequently enhancing the yield of P(3HB). The culture medium was formulated according to the experimental planning type of central composite rotational design 22. The independent variables were pH and sugar concentration (sucrose and glucose), and the dependent variables were OD600nm, dry cell weight (DCW), and P(3HB) yield. The highest cell growth, estimated by the OD600nm (20.6) and DCW (5.35) values, was obtained when sucrose was used in the culture medium at a concentration above 35 g.L-1 in combination with an acidic pH. High polymer (45%) accumulation was also achieved under these conditions. Using glucose, the best results for OD600nm (12.5) and DCW (2.74) were also obtained at acidic pH but with a sugar concentration at the minimum values evaluated. Due to the significant accumulation of polymer in the cells that were still in the growth phase, the accumulating microorganism P(3HB) Ralstonia solanacearum RS can be classified as having type II metabolism in relation to the polymer accumulation phase, which is different from other Ralstonia spp. studied until this time.
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Koller M, Maršálek L, de Sousa Dias MM, Braunegg G. Producing microbial polyhydroxyalkanoate (PHA) biopolyesters in a sustainable manner. N Biotechnol 2017; 37:24-38. [DOI: 10.1016/j.nbt.2016.05.001] [Citation(s) in RCA: 311] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 04/11/2016] [Accepted: 05/03/2016] [Indexed: 11/30/2022]
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Mravec F, Obruca S, Krzyzanek V, Sedlacek P, Hrubanova K, Samek O, Kucera D, Benesova P, Nebesarova J. Accumulation of PHA granules inCupriavidus necatoras seen by confocal fluorescence microscopy. FEMS Microbiol Lett 2016; 363:fnw094. [DOI: 10.1093/femsle/fnw094] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/09/2016] [Indexed: 11/12/2022] Open
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Production of Poly (3-Hydroxybutyric Acid) by Ralstonia eutropha in a Biocalorimeter and its Thermokinetic Studies. Appl Biochem Biotechnol 2016; 179:1041-59. [DOI: 10.1007/s12010-016-2049-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 03/11/2016] [Indexed: 12/29/2022]
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Perez-Fernandez CA, Iriarte M, Hinojosa-Delgadillo W, Veizaga-Salinas A, Cano RJ, Rivera-Perez J, Toranzos GA. First insight into microbial diversity and ion concentration in the Uyuni salt flat, Bolivia. CARIBB J SCI 2016. [DOI: 10.18475/cjos.v49i1.a6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Poly[(R)-3-hydroxybutyrate] production under different salinity conditions by a novel Bacillus megaterium strain. N Biotechnol 2016; 33:73-7. [DOI: 10.1016/j.nbt.2015.08.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 08/31/2015] [Accepted: 08/31/2015] [Indexed: 11/24/2022]
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Liu CC, Zhang LL, An J, Chen B, Yang H. Recent strategies for efficient production of polyhydroxyalkanoates by micro-organisms. Lett Appl Microbiol 2015; 62:9-15. [PMID: 26482840 DOI: 10.1111/lam.12511] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Revised: 09/29/2015] [Accepted: 10/12/2015] [Indexed: 12/15/2022]
Affiliation(s)
- C.-C. Liu
- Translational Medicine Center; Hong-Hui Hospital; Xi'an Jiaotong University College of Medicine; Xi'an China
| | - L.-L. Zhang
- Translational Medicine Center; Hong-Hui Hospital; Xi'an Jiaotong University College of Medicine; Xi'an China
| | - J. An
- Translational Medicine Center; Hong-Hui Hospital; Xi'an Jiaotong University College of Medicine; Xi'an China
| | - B. Chen
- Translational Medicine Center; Hong-Hui Hospital; Xi'an Jiaotong University College of Medicine; Xi'an China
| | - H. Yang
- Translational Medicine Center; Hong-Hui Hospital; Xi'an Jiaotong University College of Medicine; Xi'an China
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Garcia-Gonzalez L, Mozumder MSI, Dubreuil M, Volcke EI, De Wever H. Sustainable autotrophic production of polyhydroxybutyrate (PHB) from CO 2 using a two-stage cultivation system. Catal Today 2015. [DOI: 10.1016/j.cattod.2014.05.025] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Altenbuchner PT, Kronast A, Kissling S, Vagin SI, Herdtweck E, Pöthig A, Deglmann P, Loos R, Rieger B. Mechanistic Investigations of the Stereoselective Rare Earth Metal-Mediated Ring-Opening Polymerization of β-Butyrolactone. Chemistry 2015; 21:13609-17. [DOI: 10.1002/chem.201501156] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 06/02/2015] [Indexed: 02/04/2023]
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Koller M, Rodríguez-Contreras A. Techniques for tracing PHA-producing organisms and for qualitative and quantitative analysis of intra- and extracellular PHA. Eng Life Sci 2015. [DOI: 10.1002/elsc.201400228] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Martin Koller
- Department of Physical and Theoretical Chemistry, Institute of Chemistry; University of Graz; Graz Austria
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Production of Polyhydroxyalkanoates (PHAs) by Bacillus Strain Isolated from Waste Water and Its Biochemical Characterization. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/s40011-015-0626-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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Tsuge T, Hyakutake M, Mizuno K. Class IV polyhydroxyalkanoate (PHA) synthases and PHA-producing Bacillus. Appl Microbiol Biotechnol 2015; 99:6231-40. [PMID: 26135986 DOI: 10.1007/s00253-015-6777-9] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2015] [Revised: 06/11/2015] [Accepted: 06/17/2015] [Indexed: 12/28/2022]
Abstract
This review highlights the recent investigations of class IV polyhydroxyalkanoate (PHA) synthases, the newest classification of PHA synthases. Class IV synthases are prevalent in organisms of the Bacillus genus and are composed of a catalytic subunit PhaC (approximately 40 kDa), which has a PhaC box sequence ([GS]-X-C-X-[GA]-G) at the active site, and a second subunit PhaR (approximately 20 kDa). The representative PHA-producing Bacillus strains are Bacillus megaterium and Bacillus cereus; the nucleotide sequence of phaC and the genetic organization of the PHA biosynthesis gene locus are somewhat different between these two strains. It is generally considered that class IV synthases favor short-chain-length monomers such as 3-hydroxybutyrate (C4) and 3-hydroxyvalerate (C5) for polymerization, but can polymerize some unusual monomers as minor components. In Escherichia coli expressing PhaRC from B. cereus YB-4, the biosynthesized PHA undergoes synthase-catalyzed alcoholytic cleavage using endogenous and exogenous alcohols. This alcoholysis is thought to be shared among class IV synthases, and this reaction is useful not only for the regulation of PHA molecular weight but also for the modification of the PHA carboxy terminus. The novel properties of class IV synthases will open up the possibility for the design of new PHA materials.
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Affiliation(s)
- Takeharu Tsuge
- Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8502, Japan,
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Rodríguez-Contreras A, Koller M, Miranda-de Sousa Dias M, Calafell-Monfort M, Braunegg G, Marqués-Calvo MS. Influence of glycerol on poly(3-hydroxybutyrate) production by Cupriavidus necator and Burkholderia sacchari. Biochem Eng J 2015. [DOI: 10.1016/j.bej.2014.11.007] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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42
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Cervantes-Uc JM, Catzin J, Vargas I, Herrera-Kao W, Moguel F, Ramirez E, Rincón-Arriaga S, Lizama-Uc G. Biosynthesis and characterization of polyhydroxyalkanoates produced by an extreme halophilic bacterium, Halomonas nitroreducens, isolated from hypersaline ponds. J Appl Microbiol 2014; 117:1056-65. [PMID: 25048168 DOI: 10.1111/jam.12605] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Revised: 07/17/2014] [Accepted: 07/17/2014] [Indexed: 11/26/2022]
Abstract
AIMS Morphological, biochemical and genotypic characterization of a halophilic bacterium isolated from hypersaline ponds located at Las Coloradas (Río Lagartos, Yucatán, Mexico). Characterization of polymer produced by this strain was also performed. METHODS AND RESULTS Twenty strains were isolated from water samples of salt ponds and selected based on both morphological features and their PHA storage capacity, which were determined by SEM and staining methods with Nile red and Nile blue, respectively; strains were also analysed by the fluorescence imaging technique. Among them, JCCOL25.8 strain showed the highest production of PHA's reason why phenotypic and genotypic characterization was performed; this strain was identified as Halomonas nitroreducens. Polymer produced by this strain was characterized by FTIR, DSC, GPC and EDX spectroscopy. Results indicated that the biosynthesized polymer was polyhydroxybutyrate (PHB) which had a melting peak at 170°C and a crystallinity percentage of about 36%. CONCLUSIONS Based on phenotypic and genotypic aspects, JCCOL25.8 strain was identified as H. nitroreducens and it was capable to accumulate PHB. SIGNIFICANCE AND IMPACT OF THE STUDY To our knowledge, there is only one study published on the biosynthesis of PHA's by H. nitroreducens strains, although the characterization of the obtained polymer was not reported.
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Affiliation(s)
- J M Cervantes-Uc
- Centro de Investigación Científica de Yucatán, A.C., Unidad de Materiales, Mérida, Yucatán, México
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Kumar P, Patel SK, Lee JK, Kalia VC. Extending the limits of Bacillus for novel biotechnological applications. Biotechnol Adv 2013; 31:1543-61. [DOI: 10.1016/j.biotechadv.2013.08.007] [Citation(s) in RCA: 167] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Revised: 07/01/2013] [Accepted: 08/05/2013] [Indexed: 12/28/2022]
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