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Abate T, Amabile C, Muñoz R, Chianese S, Musmarra D. Polyhydroxyalkanoate recovery overview: properties, characterizations, and extraction strategies. CHEMOSPHERE 2024; 356:141950. [PMID: 38599326 DOI: 10.1016/j.chemosphere.2024.141950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 02/27/2024] [Accepted: 04/07/2024] [Indexed: 04/12/2024]
Abstract
Due to their excellent properties, polyhydroxyalkanoates are gaining increasing recognition in the biodegradable polymer market. These biogenic polyesters are characterized by high biodegradability in multiple environments, overcoming the limitation of composting plants only and their versatility in production. The most consolidated techniques in the literature or the reference legislation for the physical, chemical and mechanical characterisation of the final product are reported since its usability on the market is still linked to its quality, including the biodegradability certificate. This versatility makes polyhydroxyalkanoates a promising prospect with the potential to replace fossil-based thermoplastics sustainably. This review analyses and compares the physical, chemical and mechanical properties of poly-β-hydroxybutyrate and poly-β-hydroxybutyrate-co-β-hydroxyvalerate, indicating their current limitations and strengths. In particular, the copolymer is characterised by better performance in terms of crystallinity, hardness and workability. However, the knowledge in this area is still in its infancy, and the selling prices are too high (9-18 $ kg-1). An analysis of the main extraction techniques, established and in development, is also included. Solvent extraction is currently the most widely used method due to its efficiency and final product quality. In this context, the extraction phase of the biopolymer production process remains a major challenge due to its high costs and the need to use non-halogenated toxic solvents to improve the production of good-quality bioplastics. The review also discusses all fundamental parameters for optimising the process, such as solubility and temperature.
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Affiliation(s)
- Teresa Abate
- Department of Engineering, University of Campania "Luigi Vanvitelli", Via Roma 29, 81031, Aversa, Italy; Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina, s/n, 47011, Valladolid, Spain
| | - Claudia Amabile
- Department of Engineering, University of Campania "Luigi Vanvitelli", Via Roma 29, 81031, Aversa, Italy; Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina, s/n, 47011, Valladolid, Spain
| | - Raul Muñoz
- Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina, s/n, 47011, Valladolid, Spain
| | - Simeone Chianese
- Department of Engineering, University of Campania "Luigi Vanvitelli", Via Roma 29, 81031, Aversa, Italy.
| | - Dino Musmarra
- Department of Engineering, University of Campania "Luigi Vanvitelli", Via Roma 29, 81031, Aversa, Italy
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Huang Z, Liang B, Wang F, Ji Y, Gu P, Fan X, Li Q. Response surface optimization of poly-β-hydroxybutyrate synthesized by Bacillus cereus L17 using acetic acid as carbon source. Int J Biol Macromol 2023; 247:125628. [PMID: 37392926 DOI: 10.1016/j.ijbiomac.2023.125628] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 06/13/2023] [Accepted: 06/28/2023] [Indexed: 07/03/2023]
Abstract
A strain of Bacillus that can tolerate 10 g/L acetic acid and use the volatile fatty acids produced by the hydrolysis and acidification of activated sludge to produce polyhydroxyalkanoate was screened from the activated sludge of propylene oxide saponification wastewater. The strain was identified by 16S rRNA sequencing and phylogenetic tree analysis and was named Bacillus cereus L17. Various characterization methods showed that the polymer synthesized by strain L17 is poly-β-hydroxybutyrate, which has low crystallinity, good ductility and toughness, high thermal stability and a low polydispersity coefficient. It has wide thermoplastic material operating space as well as industrial and medicinal applications. The optimal fermentation conditions were determined by single factor optimization. Then, Plackett-Burman and Box-Behnken design experiments were carried out according to the single factor optimization results, and the response surface optimization was completed. The final results were: initial pH 6.7, temperature 25 °C, and loading volume 124 mL. The verification experiment showed that the yield of poly-β-hydroxybutyrate after optimization increased by 35.2 % compared to that before optimization.
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Affiliation(s)
- Zhaosong Huang
- School of Biological Science and Technology, University of Jinan, Jinan, China.
| | - Boya Liang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Fang Wang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Yan Ji
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Pengfei Gu
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Xiangyu Fan
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Qiang Li
- School of Biological Science and Technology, University of Jinan, Jinan, China.
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3
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Zhang Z, Lin Y, Wu S, Li X, Cheng JJ, Yang C. Effect of composition of volatile fatty acids on yield of polyhydroxyalkanoates and mechanisms of bioconversion from activated sludge. BIORESOURCE TECHNOLOGY 2023:129445. [PMID: 37399967 DOI: 10.1016/j.biortech.2023.129445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 06/29/2023] [Accepted: 06/30/2023] [Indexed: 07/05/2023]
Abstract
Polyhydroxyalkanoates (PHA) is green biodegradable natural polymer. Here PHA production from volatile fatty acids (VFAs) was investigated in sequential batch reactors inoculated with activated sludge. Single or mixed VFAs ranging from acetate to valerate were evaluated, and the dominant VFA concentration was 2 times of that of the others in the tests. Results showed that mixed substrates achieved about 1.6 times higher yield of PHA production than single substrate. The butyrate-dominated substrates maximized PHA content at 72.08% of VSS, and the valerate-dominated substrates were followed with PHA content at 61.57%. Metabolic flux analysis showed the presence of valerate in the substrates caused a more robust PHA production. There was at least 20% of 3-hydroxyvalerate in the polymer. Hydrogenophaga and Comamonas were the main PHA producers. As VFAs could be produced in anaerobic digestion of organic wastes, the methods and data here could be referred for efficient green bioconversion of PHA.
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Affiliation(s)
- Ziying Zhang
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, China
| | - Yan Lin
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, China
| | - Shaohua Wu
- Academy of Environmental and Resource Sciences, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China
| | - Xiang Li
- Hunan Urban and Rural Environmental Construction Co., Ltd, Changsha, Hunan 410118, China
| | - Jay J Cheng
- Academy of Environmental and Resource Sciences, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China; Department of Biological and Agricultural Engineering, North Carolina State University, Raleigh, NC 27695, USA
| | - Chunping Yang
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, China; Academy of Environmental and Resource Sciences, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China; School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, Jiangxi 330063, China.
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Liu L, Pan Y, Zhi X, Chen L, Zhu H. Bacterial antioxidant mechanism in calcium peroxide aided sludge anaerobic fermentation. BIORESOURCE TECHNOLOGY 2023; 384:129327. [PMID: 37328013 DOI: 10.1016/j.biortech.2023.129327] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 05/13/2023] [Accepted: 06/11/2023] [Indexed: 06/18/2023]
Abstract
Although calcium peroxide (CaO2) can enhance the short-chain fatty acids (SCFAs) production in sludge anaerobic fermentation, the microbiological mechanisms underlying this process remain unclear. In this study, it is aimed to elucidate the bacterial protective mechanisms in response to the oxidative stress induced by CaO2. Results show that extracellular polymeric substance (EPS) and anti-oxidant enzymes play vital roles in protecting bacterial cells from CaO2. The addition of CaO2 resulted in increased relative abundances of genes exoP and SRP54, which are associated with EPS secretion and transportation. Superoxide dismutase (SOD) played a crucial in alleviating oxidative stress. The dosage of CaO2 significantly influences the succession of the bacterial community in the anaerobic fermentation system. With 0.3 g CaO2/g VSS, the net income was approximately 4 USD/ton of sludge treated. The CaO2-assisted anaerobic fermentation process has the potential to recover more resources from sludge and thus, benefit the environment.
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Affiliation(s)
- Li Liu
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Yu Pan
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Xiaohan Zhi
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Long Chen
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Hongtao Zhu
- Beijing Key Lab for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
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Liang B, Zhang X, Wang F, Miao C, Ji Y, Huang Z, Gu P, Liu X, Fan X, Li Q. Production of polyhydroxyalkanoate by mixed cultivation of Brevundimonas diminuta R79 and Pseudomonas balearica R90. Int J Biol Macromol 2023; 234:123667. [PMID: 36796552 DOI: 10.1016/j.ijbiomac.2023.123667] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 01/31/2023] [Accepted: 02/09/2023] [Indexed: 02/17/2023]
Abstract
The microflora in the activated sludge of propylene oxide saponification wastewater is characterized by a clear succession after enrichment and domestication, and the specifically enriched strains can significantly increase the yield of polyhydroxyalkanoate. In this study, Pseudomonas balearica R90 and Brevundimonas diminuta R79, which are dominant strain after domestication, were selected as models to examine the interactive mechanisms associated with the synthesis of polyhydroxyalkanoate by co-cultured strains. RNA-Seq analysis revealed the up-regulated expression of the acs and phaA genes of strains R79 and R90 in the co-culture group, which enhanced their utilization of acetic acid and synthesis of poly-β-hydroxybutyrate. Cell dry weight and the yield of poly-β-hydroxybutyrate in the co-culture group were accordingly considerably higher than those in the respective pure culture groups. In addition, two-component system, quorum-sensing, flagellar synthesis-related, and chemotaxis-related genes were enriched in strain R90, thereby indicating that compared with the R79 strain, R90 can adapt more rapidly to a domesticated environment. Expression of the acs gene was higher in R79 than in R90, and consequently, strain R79 could more efficiently assimilate acetate in the domesticated environment, and thus predominated in the culture population at the end of the fermentation period.
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Affiliation(s)
- Boya Liang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Xiujun Zhang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Fang Wang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Changfeng Miao
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Yan Ji
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Zhaosong Huang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Pengfei Gu
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Xiaoli Liu
- Key Laboratory of Marine Biotechnology in Universities of Shandong, School of Life Sciences, Ludong University, Yantai, China
| | - Xiangyu Fan
- School of Biological Science and Technology, University of Jinan, Jinan, China.
| | - Qiang Li
- School of Biological Science and Technology, University of Jinan, Jinan, China.
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Zheng Y, Wang P, Wei Y, Feng Z, Jia Z, Li J, Ren L. Untargeted metabolomics elucidated biosynthesis of polyhydroxyalkanoate by mixed microbial cultures from waste activated sludge under different pH values. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 331:117300. [PMID: 36657207 DOI: 10.1016/j.jenvman.2023.117300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 01/03/2023] [Accepted: 01/12/2023] [Indexed: 06/17/2023]
Abstract
Waste activated sludge has been frequently used as mixed substrate to produce polyhydroxyalkanoate (PHA). However, insufficient research on microbial metabolism has led to difficulties in regulating PHA accumulation in mixed microbial cultures (MMCs). To explore the variation of functional genes during domestication and the effect of different pH conditions on metabolic pathways during PHA accumulation, MMCs were domesticated by adding acetate and propionate with aerobic dynamic feeding strategy for 60 days. As the domestication progressed, the microbial community diversity declined and PHA-producing bacteria, Brevundimonas, Dechloromonas and Hyphomonas, were enriched. Through bacterial function prediction by PICRUSt the gene rpoE involved in starvation resistance of bacteria was enriched after the domestication. The pH value of 8.5 was the best condition for PHA accumulation in MMCs, under which a maximum PHA content reached 23.50% and hydroxybutyric (HB)/hydroxyvaleric (HV) reached 2.22. Untargeted metabolomics analysis exhibited that pH conditions of 7 and 8.5 could promote the up-regulation of significant differential metabolites, while higher alkaline conditions caused the inhibition of metabolic activity. Functional annotation showed that pH condition of 8.5 significantly affected Pyrimidine metabolism, resulting in an increase in PHA production. Regarding the pathways of PHA biosynthesis, acetoacetate was found to be significant in the metabolism of hydroxybutyric, and the alkaline condition could restrain the conversion from hydroxybutyric (HB) to the acetoacetate to protect PHB accumulation in MMCs compared with neutral condition. Taken together, the present results can advance the fundamental understanding of metabolic function in PHA accumulation under different pH conditions.
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Affiliation(s)
- Yi Zheng
- State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China; College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, 100193, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Suzhou, 215128, China
| | - Pan Wang
- State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China.
| | - Yuquan Wei
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, 100193, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Suzhou, 215128, China
| | - Ziwei Feng
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, 100193, China
| | - Zhijie Jia
- State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China
| | - Ji Li
- College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing, 100193, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Suzhou, 215128, China
| | - Lianhai Ren
- State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China.
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Fan X, Ji M, Sun K, Li Q. Microbial and phage communities as well as their interaction in PO saponification wastewater treatment systems. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2023; 87:354-365. [PMID: 36706286 DOI: 10.2166/wst.2022.422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Viruses or phages were considered affecting microbial community composition, metabolic process, and biogeochemical cycles. However, phage communities and their potential associations with microbial community are not well understood in the activated sludge (AS) of wastewater treatment plants (WWTPs). In this study, we explored the interactions between phages and microbial community by using propylene oxide (PO) saponification WWTPs as an example. Bacterial, eukaryal and archaeal communities were investigated and 34 phage contigs (>10 kb) were recovered from PO saponification WWTPs. At least 3 complete phage genomes were assembled. In all 34 phages, 21 of them have been predicted to their host. The association network analysis showed that abundant phages were associated with abundant microorganisms. This result conformed to Kill-the-Winner model. Notably, 45 auxiliary metabolic genes (AMGs) were identified from phage genomes (including small contig fragments). They influenced bacterial metabolism through facilitating phages replication and avoiding host death. Collectively, our results suggested that phage community affect microbial community and metabolic pathways by killing their hosts and AMGs transfer in AS of PO saponification WWTPs.
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Affiliation(s)
- Xiangyu Fan
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China E-mail:
| | - Mengzhi Ji
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China E-mail:
| | - Kaili Sun
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China E-mail:
| | - Qiang Li
- School of Biological Science and Technology, University of Jinan, Jinan 250022, China E-mail:
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8
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Efficient production of poly-3-hydroxybutyrate from acetate and butyrate by halophilic bacteria Salinivibrio spp. TGB4 and TGB19. Int J Biol Macromol 2022; 221:1365-1372. [PMID: 36126806 DOI: 10.1016/j.ijbiomac.2022.09.141] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 09/07/2022] [Accepted: 09/15/2022] [Indexed: 11/20/2022]
Abstract
Volatile fatty acids (VFAs) derived from biomass are considered to be economical and environmentally friendly feedstocks for microbial fermentation. Converting VFAs to polyhydroxyalkanoate (PHA) could reduce the substrate cost and provide an economically viable route for the commercialization of PHA. The halophilic bacteria Salinivibrio spp. TGB4 and TGB19, newly isolated from salt fields, were found to accumulate poly-3-hydroxybutyrate (PHB) using acetate or butyrate as the substrate. Both strains exhibited considerable cell growth (OD600 of ~8) even at acetate concentration of 100 g/L. In shake flask cultures, TGB4 produced PHB titers of 0.90 and 1.34 g/L, while TGB19 produced PHB titers of 0.25 and 2.53 g/L with acetate and butyrate, respectively. When acetate and butyrate were both applied, PHB production was significantly increased, and the PHB titer of TGB4 and TGB19 reached 6.14 and 6.84 g/L, respectively. After optimizing the culture medium, TGB19 produced 8.42 g/L PHB, corresponding to 88.55 wt% of cell dry weight. During fed-batch cultivation, TGB19 produced a PHB titer of 53.23 g/L. This is the highest reported PHB titer using acetate and butyrate by pure microbial cultures and would provide promising hosts for the industrial production of PHA from VFAs.
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Wen Q, Liu S, Lin X, Liu B, Chen Z. Rapid recovery of mixed culture polyhydroxyalkanoate production system from EPS bulking using azithromycin. BIORESOURCE TECHNOLOGY 2022; 350:126944. [PMID: 35247561 DOI: 10.1016/j.biortech.2022.126944] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 02/28/2022] [Accepted: 03/01/2022] [Indexed: 06/14/2023]
Abstract
The long-term stable operation of the mixed culture polyhydroxyalkanoate (PHA) enrichment stage is the guarantee for the continuous synthesis of PHA, however extracellular polymeric substances (EPS) sludge bulking occurred from time to time may cause the operation fail. In order to solve this problem, as a quencher of signal molecules and antibiotic, azithromycin (AZM) was used in the two systems with different modes to recover the sedimentation capacity of the sludge. The results showed that AZM addition resulted in the reduction of polysaccharide /protein (PS/PN) ratio in EPS and significant improvement of the sedimentation capacity of the sludge. Quorum quenching of AZM or aiiA gene maintained the sedimentation ability of the sludge in a relay mode. By adding AZM, the growth of Thauera and Flavobacterium, which caused sludge bulking, was inhibited. Paracoccus, a strong PHA producer, has been enriched to ensure that the maximum PHA synthesis of the system.
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Affiliation(s)
- Qinxue Wen
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | - Shaojiao Liu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | - Xiao Lin
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | - Baozhen Liu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China
| | - Zhiqiang Chen
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
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Miao C, Meng D, Liu Y, Wang F, Chen L, Huang Z, Fan X, Gu P, Li Q. Biosynthesis of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) in metabolically recombinant Escherichia coli. Int J Biol Macromol 2021; 193:956-964. [PMID: 34751142 DOI: 10.1016/j.ijbiomac.2021.10.183] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 10/08/2021] [Accepted: 10/23/2021] [Indexed: 11/25/2022]
Abstract
In this study, a phaCR gene encoding PHA synthase was identified in Rhodoligotrophos defluvii which was adjacent to β-ketothiolase encoded by phaAR gene and acetoacetyl-CoA reductase encoded by phaBR gene. Amino acid comparison of PhaCR showed the highest homology of 65.98% with PhaC of R. appendicifer, while its homology with typical class I PHA synthase in Cupriavidus necator was only 42.54%. PHA synthesis genes were then transformed into E. coli harboring phaCABR and phaCRABC which were cultured with 15 g/L glucose respectively, and 20.46 wt% and 16.95 wt% of CDW for poly(3-hydroxybutyrate) (PHB) were accumulated respectively. To further explore the effect of substrate specificity for PHA production, the ptsG gene was then deleted and 15 g/L glucose and 1.5 g/L propionate were co-employed as carbon sources, which enabled the synthesis of poly(3HB-co-3HV) copolymer. As a result, poly(3HB-co-3HV) was accumulated up to 24.74 wt% of CDW, and the highest content of 3-hydroxyvalerate (3HV) was 10.86 mol%. The Td5 was 260 °C, which implied that it possessed good thermal stability, and the Mw of GPC in recombinant strains were between 22 and 26 × 104 g/mol, and the highest PDI was 3.771. The structure of poly (3HB-co-3HV) copolymer was determined through 1H NMR analysis.
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Affiliation(s)
- Changfeng Miao
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Dong Meng
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Yuling Liu
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Fang Wang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Lu Chen
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Zhaosong Huang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Xiangyu Fan
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Pengfei Gu
- School of Biological Science and Technology, University of Jinan, Jinan, China.
| | - Qiang Li
- School of Biological Science and Technology, University of Jinan, Jinan, China.
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Meng D, Gong C, Sukumaran RK, Dionysiou DD, Huang Z, Li R, Liu Y, Ji Y, Gu P, Fan X, Li Q. Production of polyhydroxyalkanoates from propylene oxide saponification wastewater residual sludge using volatile fatty acids and bacterial community succession. BIORESOURCE TECHNOLOGY 2021; 329:124912. [PMID: 33667990 DOI: 10.1016/j.biortech.2021.124912] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Revised: 02/21/2021] [Accepted: 02/23/2021] [Indexed: 06/12/2023]
Abstract
The active sludge treating propylene oxide saponification wastewater has heavy salt concentration and is hard to treat. The integration of the residual sludge treatment with polyhydroxyalkanoates (PHA) production may provide an economic and environment friendly solution. PHA production was therefore studied in two sequencing biological reactors with effective volume of 30 L using the active sludge. The two reactors, named as SBR-I and SBR-II, were fed with acetic acid, and a mixture of acetic acid and propionic acid respectively. PHA was obtained with a yield of 9.257 g/L in SBR-II. Also, the proportion of 3-hydroxyvalarate was enhanced from 5% to 30% in comparison to SBR-I (5.471 g/L). Illumina MiSeq and Pacific Biosciences sequencing platforms were used to evaluate the community structure, which revealed that the bacterial genera showed a high degree of diversity in the PHA accumulating microbial community. Azoarcus was the most dominant PHA accumulating microorganism after acclimation.
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Affiliation(s)
- Dong Meng
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Chunjie Gong
- National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei University of Technology, Wuhan, China
| | - Rajeev Kumar Sukumaran
- Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695019, India
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, University of Cincinnati, Cincinnati, OH 45221-0012, United States
| | - Zhaosong Huang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Ruirui Li
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Yuling Liu
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Yan Ji
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Pengfei Gu
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Xiangyu Fan
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Qiang Li
- School of Biological Science and Technology, University of Jinan, Jinan, China.
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Naser AZ, Deiab I, Darras BM. Poly(lactic acid) (PLA) and polyhydroxyalkanoates (PHAs), green alternatives to petroleum-based plastics: a review. RSC Adv 2021; 11:17151-17196. [PMID: 35479695 PMCID: PMC9033233 DOI: 10.1039/d1ra02390j] [Citation(s) in RCA: 132] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 05/02/2021] [Indexed: 11/21/2022] Open
Abstract
In spite of the fact that petroleum-based plastics are convenient in terms of fulfilling the performance requirements of many applications, they contribute significantly to a number of ecological and environmental problems. Recently, the public awareness of the negative effects of petroleum-based plastics on the environment has increased. The present utilization of natural resources cannot be sustained forever. Furthermore, oil is often subjected to price fluctuations and will eventually be depleted. The increase in the level of carbon dioxide due to the combustion of fossil fuel is causing global warming. Concerns about preservation of natural resources and climate change are considered worldwide motivations for academic and industrial researchers to reduce the consumption and dependence on fossil fuel. Therefore, bio-based polymers are moving towards becoming the favorable option to be utilized in polymer manufacturing, food packaging, and medical applications. This paper represents an overview of the feasibility of both Poly Lactic Acid (PLA) and polyhydroxyalkanoates (PHAs) as alternative materials that can replace petroleum-based polymers in a wide range of industrial applications. Physical, thermal, rheological, and mechanical properties of both polymers as well as their permeability and migration properties have been reviewed. Moreover, PLA's recyclability, sustainability, and environmental assessment have been also discussed. Finally, applications in which both polymers can replace petroleum-based plastics have been explored and provided.
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Affiliation(s)
- Ahmed Z Naser
- Advanced Manufacturing Laboratory, University of Guelph Guelph ON Canada
| | - I Deiab
- Advanced Manufacturing Laboratory, University of Guelph Guelph ON Canada
| | - Basil M Darras
- Department of Mechanical Engineering, American University of Sharjah Sharjah UAE
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Rivera-Briso AL, Serrano-Aroca Á. Poly(3-Hydroxybutyrate- co-3-Hydroxyvalerate): Enhancement Strategies for Advanced Applications. Polymers (Basel) 2018; 10:E732. [PMID: 30960657 PMCID: PMC6403723 DOI: 10.3390/polym10070732] [Citation(s) in RCA: 123] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 06/28/2018] [Accepted: 06/29/2018] [Indexed: 01/21/2023] Open
Abstract
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate), PHBV, is a microbial biopolymer with excellent biocompatible and biodegradable properties that make it a potential candidate for substituting petroleum-derived polymers. However, it lacks mechanical strength, water sorption and diffusion, electrical and/or thermal properties, antimicrobial activity, wettability, biological properties, and porosity, among others, limiting its application. For this reason, many researchers around the world are currently working on how to overcome the drawbacks of this promising material. This review summarises the main advances achieved in this field so far, addressing most of the chemical and physical strategies to modify PHBV and placing particular emphasis on the combination of PHBV with other materials from a variety of different structures and properties, such as other polymers, natural fibres, carbon nanomaterials, nanocellulose, nanoclays, and nanometals, producing a wide range of composite biomaterials with increased potential applications. Finally, the most important methods to fabricate porous PHBV scaffolds for tissue engineering applications are presented. Even though great advances have been achieved so far, much research needs to be conducted still, in order to find new alternative enhancement strategies able to produce advanced PHBV-based materials able to overcome many of these challenges.
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Affiliation(s)
- Ariagna L Rivera-Briso
- Escuela de Doctorado, Universidad Católica de Valencia San Vicente Mártir, C/Guillem de Castro 65, 46008 Valencia, Spain.
| | - Ángel Serrano-Aroca
- Facultad de Veterinaria y Ciencias Experimentales, Universidad Católica de Valencia San Vicente Mártir, C/Guillem de Castro 94, 46001 Valencia, Spain.
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Li R, Gu P, Fan X, Shen J, Wu Y, Huang L, Li Q. Isolation and Characterization of PHA-Producing Bacteria from Propylene Oxide Saponification Wastewater Residual Sludge. Appl Biochem Biotechnol 2018; 186:233-244. [PMID: 29564736 DOI: 10.1007/s12010-018-2731-5] [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: 01/04/2018] [Accepted: 02/27/2018] [Indexed: 11/28/2022]
Abstract
A polyhydroxyalkanoate (PHA)-producing strain was isolated from propylene oxide (PO) saponification wastewater activated sludge and was identified as Brevundimonas vesicularis UJN1 through 16S rDNA sequencing and Biolog microbiological identification. Single-factor and response surface methodology experiments were used to optimize the culture medium and conditions. The optimal C/N ratio was 100/1.04, and the optimal carbon and nitrogen sources were sucrose (10 g/L) and NH4Cl (0.104 g/L) respectively. The optimal culture conditions consisted of initial pH of 6.7 and an incubation temperature of 33.4 °C for 48 h, with 15% inoculum and 100 mL medium at an agitation rate of 180 rpm. The PHA concentration reached 34.1% of the cell dry weight and increased three times compared with that before optimization. The only report of PHA-producing bacteria by Brevundimonas vesicularis showed that the conversion rate of PHAs using glucose as the optimal carbon source was 1.67%. In our research, the conversion rate of PHAs with sucrose as the optimal carbon source was 3.05%, and PHA production using sucrose as the carbon source was much cheaper than that using glucose as the carbon source.
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Affiliation(s)
- Ruirui Li
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Pengfei Gu
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Xiangyu Fan
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Junyu Shen
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Yulian Wu
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Lixuan Huang
- School of Biological Science and Technology, University of Jinan, Jinan, China
| | - Qiang Li
- School of Biological Science and Technology, University of Jinan, Jinan, China.
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Hao J, Wang H, Wang X. Selecting optimal feast-to-famine ratio for a new polyhydroxyalkanoate (PHA) production system fed by valerate-dominant sludge hydrolysate. Appl Microbiol Biotechnol 2018; 102:3133-3143. [DOI: 10.1007/s00253-018-8799-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 01/15/2018] [Accepted: 01/18/2018] [Indexed: 10/17/2022]
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Fan X, Zhu Y, Gu P, Li Y, Xiao G, Song D, Wang Y, He R, Zheng H, Li Q. Bacterial community compositions of propylene oxide saponification wastewater treatment plants. RSC Adv 2017. [DOI: 10.1039/c6ra27808f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this study, the bacterial community structures of propylene oxide saponification wastewater treatment plants were explored for the first time.
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Affiliation(s)
- Xiangyu Fan
- School of Biological Science and Technology
- University of Jinan
- Jinan
- China
| | - Ying Zhu
- New Materials Research Institute of Shandong Academy of Sciences
- Jinan
- China
| | - Pengfei Gu
- School of Biological Science and Technology
- University of Jinan
- Jinan
- China
| | - Yumei Li
- School of Biological Science and Technology
- University of Jinan
- Jinan
- China
| | - Guiqing Xiao
- College of Bioscience and Biotechnology
- Hunan Agricultural University
- Changsha
- China
| | - Dongxue Song
- School of Biological Science and Technology
- University of Jinan
- Jinan
- China
| | - Yiwei Wang
- School of Biological Science and Technology
- University of Jinan
- Jinan
- China
| | - Rong He
- School of Biological Science and Technology
- University of Jinan
- Jinan
- China
| | - Huajun Zheng
- Key Laboratory of Reproduction Regulation of NPFPC
- SIPPR
- IRD
- Fudan University
- Shanghai
| | - Qiang Li
- School of Biological Science and Technology
- University of Jinan
- Jinan
- China
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