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Wei Z, Xia Y, Su Y, Quan Y, Sun L, Wang S, Zhu F, Chen Z, Tian J, Wang WC, Zhou W, Yu H. Modulating and optimizing Pluronic F-68 concentrations and feeding for intensified perfusion Chinese hamster ovary cell cultures. Biotechnol Prog 2023; 39:e3340. [PMID: 36970759 DOI: 10.1002/btpr.3340] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 02/21/2023] [Accepted: 03/10/2023] [Indexed: 03/29/2023]
Abstract
Perfusion culture is often performed with micro-sparger to fulfill the high oxygen demand from the densified cells. Protective additive Pluronic F-68 (PF-68) is widely used to mitigate the adverse effect in cell viability from micro-sparging. In this study, different PF-68 retention ratio in alternating tangential filtration (ATF) columns was found to be crucial for cell performance of different perfusion culture modes. The PF-68 in the perfusion medium was found retained inside the bioreactor when exchanged through ATF hollow fibers with a small pore size (50 kD). The accumulated PF-68 could provide sufficient protection for cells under micro-sparging. On the other hand, with large-pore-size (0.2 μm) hollow fibers, PF-68 could pass through the ATF filtration membranes with little retention, and consequently led to compromised cell growth. To overcome the defect, a PF-68 feeding strategy was designed and successfully verified on promoting cell growth with different Chinese hamster ovary (CHO) cell lines. With PF-68 feeding, enhancements were observed in both viable cell densities (20%-30%) and productivity (~30%). A threshold PF-68 concentration of 5 g/L for high-density cell culture (up to 100 × 106 cells/mL) was also proposed and verified. The additional PF-68 feeding was not observed to affect product qualities. By designing the PF-68 concentration of perfusion medium to or higher than the threshold level, a similar cell growth enhancement was also achieved. This study systematically investigated the protecting role of PF-68 in intensified CHO cell cultures, shedding a light on the optimization of perfusion cultures through the control of protective additives.
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Affiliation(s)
- Zhaohui Wei
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
| | - Yang Xia
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
| | - Yuning Su
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
| | - Yufen Quan
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
| | - Liuliu Sun
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
| | - Shanshan Wang
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
| | - Fangjian Zhu
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
| | - Zhenzhen Chen
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
| | - Jun Tian
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
| | - Wei-Chun Wang
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
| | - Weichang Zhou
- WuXi Biologics, 299 Fute Zhong Road, Waigaoqiao Free Trade Zone, Shanghai, 200131, China
| | - Haiyang Yu
- Process Development, WuXi Biologics, 108 Meiliang Road, Wuxi, 214092, China
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2
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Teke GM, Gakingo GK, Pott RW. A numerical investigation of the hydrodynamic and mass transfer behavior of a liquid-liquid semi-partition bioreactor (SPB) designed for in-situ extractive fermentation. Chem Eng Sci 2023. [DOI: 10.1016/j.ces.2022.118226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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3
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A comprehensive comparison of mixing and mass transfer in shake flasks and their relationship with MAb productivity of CHO cells. Bioprocess Biosyst Eng 2022; 45:1033-1045. [DOI: 10.1007/s00449-022-02722-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Accepted: 03/14/2022] [Indexed: 11/26/2022]
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4
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The Effect of Various Salinities and Light Intensities on the Growth Performance of Five Locally Isolated Microalgae [Amphidinium carterae, Nephroselmis sp., Tetraselmis sp. (var. red pappas), Asteromonas gracilis and Dunaliella sp.] in Laboratory Batch Cultures. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2021. [DOI: 10.3390/jmse9111275] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
After a 1.5-year screening survey in the lagoons of Western Greece in order to isolate and culture sturdy species of microalgae for aquaculture or other value-added uses, as dictated primarily by satisfactory potential for their mass culture, five species emerged, and their growth was monitored in laboratory conditions. Amphidinium carterae, Nephroselmis sp., Tetraselmis sp. (var. red pappas), Asteromonas gracilis, and Dunaliella sp. were batch cultured using low (20 ppt), sea (40 ppt), and high salinity (50 or 60 or 100 ppt) and in combination with low (2000 lux) and high (8000 lux) intensity illumination. The results exhibited that all these species can be grown adequately in all salinities and with the best growth in terms of maximum cell density, specific growth rate (SGR), and biomass yield (g dry weight/L) at high illumination (8000 lux). The five species examined exhibited different responses in the salinities used, whereby Amphidinium clearly performs best in 20 ppt, far better than 40 ppt, and even more so than 50 ppt. Nephroselmis and Tetraselmis grow almost the same in 20 and 40 ppt and less well in 60 ppt. Asteromonas performs best in 100 ppt, although it can grow quite well in both 40 and 60 ppt. Dunaliella grows equally well in all salinities (20, 40, 60 ppt). Concerning the productivity, assessed as the maximum biomass yield at the end of the culture period, the first rank is occupied by Nephroselmis with ~3.0 g d.w./L, followed by Tetraselmis (2.0 g/L), Dunaliella (1.58 g/L), Amphidinium (1.19 g/L), and Asteromonas (0.7 g/L) with all values recorded at high light (8000 lux).
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5
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İnan B, Özçimen D. Microalgal Bioprocess Toward the Production of Microalgal Oil Loaded Bovine Serum Albumin Nanoparticles. Protein J 2021; 40:377-387. [PMID: 33755855 DOI: 10.1007/s10930-021-09975-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/08/2021] [Indexed: 10/21/2022]
Abstract
Microalgal biotechnology has increased rapidly owing to have high value bioactive compounds and numerous consumer products that can be utilized from microalgae. With the development of novel cultivation and processing methods, microalgal biotechnology can meet the high demands of food, energy and pharmaceutical industries. In this context, especially for food and pharmaceutical applications, encapsulation of microalgal bioactive compounds is carried out to protect the compound from oxidation and degradation. In this study, a microalgal production process was carried out and microalgal oil loaded bovine serum albumin (BSA) nanoparticle production using glucose as cross-linking agent was investigated. The influences of different process parameters such as initial BSA concentration, glucose concentration and desolvation temperature on the size of BSA nanoparticles were investigated to achieve very small size nanoparticles. Furthermore, data obtained from the experiments were assessed statistically to model the process. It was found that the obtained nanoparticles showed spherical shape with the mean particle size of around 200-300 nm with zeta potential of about - 23 mV. Also, stability test showed that, there was not any change in particle size for one month storage and nanoparticle structure enhance the protection of microalgae oil from oxidation. At last, antibacterial effect of nanoparticles was presented against E. coli ATCC 8739 and L. monocytogenes ATCC 13932. In here, we demonstrated a microalgal bioprocess which consists of microalgae production to obtain microalgal oil riched in bioactive and, encapsulation of microalgal oil to protect it from environmental conditions.
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Affiliation(s)
- Benan İnan
- Bioengineering Department, Yıldız Technical University, 34220, Istanbul, Turkey.
| | - Didem Özçimen
- Bioengineering Department, Yıldız Technical University, 34220, Istanbul, Turkey
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6
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Ding N, Li C, Wang T, Guo M, Mohsin A, Zhang S. Evaluation of an enclosed air-lift photobioreactor (ALPBR) for biomass and lipid biosynthesis of microalgal cells grown under fluid-induced shear stress. BIOTECHNOL BIOTEC EQ 2020. [DOI: 10.1080/13102818.2020.1856717] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Ning Ding
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, PR China
| | - Chao Li
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, PR China
| | - Tao Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, PR China
| | - Meijin Guo
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, PR China
| | - Ali Mohsin
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, PR China
| | - Siliang Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, PR China
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Garcia-Ochoa F, Gomez E, Santos VE. Fluid dynamic conditions and oxygen availability effects on microbial cultures in STBR: An overview. Biochem Eng J 2020. [DOI: 10.1016/j.bej.2020.107803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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8
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Gallardo-Rodríguez J, Astuya-Villalón A, Avello V, Llanos-Rivera A, Krock B, Agurto-Muñoz C, Sánchez-Mirón A, García-Camacho F. Production of extracts with anaesthetic activity from the culture of Heterosigma akashiwo in pilot-scale photobioreactors. ALGAL RES 2020. [DOI: 10.1016/j.algal.2019.101760] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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9
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Computational fluid dynamic analysis of hydrodynamic shear stress generated by different impeller combinations in stirred bioreactor. Biochem Eng J 2019. [DOI: 10.1016/j.bej.2019.107312] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Effects of fluid-dynamic conditions in Shimwellia blattae (p424IbPSO) cultures in stirred tank bioreactors: Hydrodynamic stress and change of metabolic routes by oxygen availability. Biochem Eng J 2019. [DOI: 10.1016/j.bej.2019.107238] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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11
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Rayen F, Behnam T, Dominique P. Optimization of a raceway pond system for wastewater treatment: a review. Crit Rev Biotechnol 2019; 39:422-435. [DOI: 10.1080/07388551.2019.1571007] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Filali Rayen
- LGPM, CentraleSupélec, SFR Condorcet FR CNRS 3417, Université de Paris-Saclay, Centre Européen de Biotechnologie et de Bioéconomie (CEBB), Pomacle, France
| | - Taidi Behnam
- LGPM, CentraleSupélec, SFR Condorcet FR CNRS 3417, Université de Paris-Saclay, Centre Européen de Biotechnologie et de Bioéconomie (CEBB), Pomacle, France
| | - Pareau Dominique
- LGPM, CentraleSupélec, SFR Condorcet FR CNRS 3417, Université de Paris-Saclay, Centre Européen de Biotechnologie et de Bioéconomie (CEBB), Pomacle, France
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12
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Chu WL, Phang SM. Bioactive Compounds from Microalgae and Their Potential Applications as Pharmaceuticals and Nutraceuticals. GRAND CHALLENGES IN ALGAE BIOTECHNOLOGY 2019. [DOI: 10.1007/978-3-030-25233-5_12] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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13
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Li J, Li C, Lan CQ, Liao D. Effects of sodium bicarbonate on cell growth, lipid accumulation, and morphology of Chlorella vulgaris. Microb Cell Fact 2018; 17:111. [PMID: 29986703 PMCID: PMC6038239 DOI: 10.1186/s12934-018-0953-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 06/28/2018] [Indexed: 11/10/2022] Open
Abstract
Background Low concentration NaHCO3 (ca. 12 mM) had been demonstrated to be an excellent carbon source for industrially important green alga Chlorella vulgaris and high concentration NaHCO3 (e.g. 160 mM) had been shown to be capable of controlling protozoa and stimulating lipid accumulation of another green alga, i.e., Neochloris oleoabundans. Furthermore, little was known about the mechanisms of the effects of NaHCO3 on microalgae. Thorough studies on the effects of high NaHCO3 on C. vulgaris and their mechanisms were therefore warranted. Methods We systematically compared the cell growth, lipid production, and cell morphology of the industrially important C. vulgaris in 160 mM NaHCO3 or 160 mM NaCl media at different pH levels. These data allowed us to analyze the effects of total dissolved inorganic carbon (DIC) and individual DIC species on C. vulgaris. Cell growth of C. vulgaris at a range of concentrations at 160 mM or lower was also studied. Results Cellular lipid cell content of 494 mg g−1 and lipid productivity of 44.5 mg L−1 day−1 were obtained at 160 mM NaHCO3 and pH 9.5. High concentration NaHCO3 (e.g. 160 mM) was inhibitive to cell growth but stimulating to lipid accumulation and caused unicellular C. vulgaris to transfer to colonial cells. Increasing pH in the range of 7.5–9.5 caused increasing inhibition to cell growth in 160 mM NaCl. Whereas the optimal pH for cell growth was 8.5 for 160 mM NaHCO3 cultures. Comparative experiments with 0–160 mM NaHCO3 indicate that 10 mM was the optimal concentration and increasing NaHCO3 from 10 to 160 mM caused increasing inhibition to cell growth. Conclusions High concentration DIC was inhibitor to cell growth but stimulator to lipid accumulation of C. vulgaris. It caused unicellular C. vulgaris to transform to colonial cells. Results suggest that high concentration of a particular DIC species, i.e., dCO2, was the primary stress responsible for cell growth inhibition. Where CO32− was likely the DIC species responsible for lipid stimulation of C. vulgaris. Furthermore, we propose that the colony formation at high DIC conditions was employed by C. vulgaris to mitigate the stress by minimizing cell exposure to unfavorable environment.
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Affiliation(s)
- Jingya Li
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry & Chemical Engineering, Guangxi University, Nanning, 530004, China.,Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Changhao Li
- Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Christopher Q Lan
- Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.
| | - Dankui Liao
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry & Chemical Engineering, Guangxi University, Nanning, 530004, China
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14
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Paik SM, Jin E, Sim SJ, Jeon NL. Vibration-induced stress priming during seed culture increases microalgal biomass in high shear field-cultivation. BIORESOURCE TECHNOLOGY 2018; 254:340-346. [PMID: 29397260 DOI: 10.1016/j.biortech.2018.01.108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 01/15/2018] [Accepted: 01/22/2018] [Indexed: 06/07/2023]
Abstract
Vibrational wave treatment has been used to increase proliferation of microalgae. When directly applied at large scale, however, turbulence can offset positive effects of vibration on microalgae proliferation. Moreover, severe hydrodynamic shear fields in the bioreactor decrease cell viability that detrimentally influence maximum yieldable biomass. In this study, vibration pretreatment (between 10-30 Hz and 0.15-0.45 G) was used to prime the cells for enhanced biomass. When exposed to 10 Hz at 0.15 G for 72 h and inoculated in baffled flasks of large shear fields (0.292 Pa for the average wall shear force (aveWSF) and 184 s-1 for the average shear strain rate (aveSSR)), microalgae showed 27% increase in biomass as well as 39% increase in corresponding amount of heterologous protein (i.e. GFP-3HA). Our results show that stress primed microalgae with vibrations can lead to improved proliferation that results in increased biomass production at industrial scale bioprocesses.
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Affiliation(s)
- Sang-Min Paik
- Interdisciplinary Program for Bioengineering, Seoul National University, Seoul 08826, Republic of Korea
| | - EonSeon Jin
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea
| | - Sang Jun Sim
- Department of Chemical and Biological Engineering, Korea University, Seoul 02846, Republic of Korea
| | - Noo Li Jeon
- Interdisciplinary Program for Bioengineering, Seoul National University, Seoul 08826, Republic of Korea; School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, Republic of Korea; Institute of Advanced Mechanics and Design, Seoul National University, Seoul 08826, Republic of Korea.
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15
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Qin B, Yang G, Ma J, Wu T, Li W, Liu L, Deng J, Zhou J. Spatiotemporal Changes of Cyanobacterial Bloom in Large Shallow Eutrophic Lake Taihu, China. Front Microbiol 2018; 9:451. [PMID: 29619011 PMCID: PMC5871682 DOI: 10.3389/fmicb.2018.00451] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 02/27/2018] [Indexed: 11/13/2022] Open
Abstract
Lake Taihu is a large shallow eutrophic lake with frequent recurrence of cyanobacterial bloom which has high variable distribution in space and time. Based on the field observations and remote sensing monitoring of cyanobacterial bloom occurrence, in conjunction with laboratory controlled experiments of mixing effects on large colony formation and colonies upward moving velocity measurements, it is found that the small or moderate wind-induced disturbance would increase the colonies size and enable it more easily to overcome the mixing and float to water surface rapidly during post-disturbance. The proposed mechanism of wind induced mixing on cyanobacterial colony enlargement is associated with the presence of the extracellular polysaccharide (EPS) which increased the size and buoyancy of cyanobacteria colonies and promote the colonies aggregate at the water surface to form bloom. Both the vertical movement and horizontal migration of cyanobacterial colonies were controlled by the wind induced hydrodynamics. Because of the high variation of wind and current coupling with the large cyanobacterial colony formation make the bloom occurrence as highly mutable in space and time. This physical factor determining cyanobacterial bloom formation in the large shallow lake differ from the previously documented light-mediated bloom formation dynamics.
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Affiliation(s)
- Boqiang Qin
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China
| | - Guijun Yang
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, China
| | - Jianrong Ma
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China.,Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China
| | - Tingfeng Wu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China
| | - Wei Li
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China
| | - Lizhen Liu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China.,Research Center of Poyang Lake, Jiangxi Academy of Sciences, Nanchang, China
| | - Jianming Deng
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China
| | - Jian Zhou
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, China
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16
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Abstract
Cultivation of microalgae requires consideration of shear stress, which is generated by operations such as mixing, circulation, aeration and pumping that are designed to facilitate mass and heat transfer as well as light distribution in cultures. Excessive shear stress can cause increased cell mortality, decreased growth rate and cell viability, or even cell lysis. This review examines the sources of shear stress in different cultivation systems, shear stress tolerance of different microalgal species and the physiological factors and environmental conditions that may affect shear sensitivity, and potential approaches to mitigate the detrimental effects of shear stress. In general, green algae have the greatest tolerance to shear stress, followed by cyanobacteria, haptophytes, red algae, and diatoms, with dinoflagellates comprising the most shear-sensitive species. The shear-sensitivity of microalgae is determined primarily by cell wall strength, cell morphology and the presence of flagella. Turbulence, eddy size, and viscosity are the most prominent parameters affecting shear stress to microalgal cells during cultivation.
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Affiliation(s)
- Chinchin Wang
- Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur Private, Ottawa, ON K1N 6N5, Canada; Department of Biochemistry, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Christopher Q Lan
- Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis Pasteur Private, Ottawa, ON K1N 6N5, Canada.
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17
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Gao X, Kong B, Vigil RD. Multiphysics simulation of algal growth in an airlift photobioreactor: Effects of fluid mixing and shear stress. BIORESOURCE TECHNOLOGY 2018; 251:75-83. [PMID: 29272771 DOI: 10.1016/j.biortech.2017.12.014] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 12/04/2017] [Accepted: 12/06/2017] [Indexed: 06/07/2023]
Abstract
A multiphysics model has been developed to predict the effects of fluid mixing and shear stress on microalgal growth in an airlift photobioreactor. The model integrates multiphase flow dynamics, radiation transport, shear stress, and algal growth kinetics using an Eulerian approach. The model is first validated by comparing its predictions with experimental data, and then the radiation transport and algal growth kinetics submodels are added to predict biomass accumulation under different flow conditions. The simulations correctly predict biomass growth curves for a wide range of superficial gas flow rates and demonstrate that biomass productivity increases with increased gas flow rate due to better light delivery to microorganisms. However, at the higher gas flow rates considered, shear stress on microorganisms inhibits biomass growth. Lastly, it is shown that the Eulerian approach used here provides a less cumbersome computational approach and provides better predictions than the circulation time and Lagrangian approaches.
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Affiliation(s)
- Xi Gao
- Department of Chemical & Biological Engineering, Iowa State University, Ames, IA 50011, United States.
| | - Bo Kong
- Ames Laboratory, Ames, IA 50011, United States
| | - R Dennis Vigil
- Department of Chemical & Biological Engineering, Iowa State University, Ames, IA 50011, United States.
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18
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Assunção J, Guedes AC, Malcata FX. Biotechnological and Pharmacological Applications of Biotoxins and Other Bioactive Molecules from Dinoflagellates. Mar Drugs 2017; 15:E393. [PMID: 29261163 PMCID: PMC5742853 DOI: 10.3390/md15120393] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/12/2017] [Accepted: 12/15/2017] [Indexed: 12/26/2022] Open
Abstract
The long-lasting interest in bioactive molecules (namely toxins) produced by (microalga) dinoflagellates has risen in recent years. Exhibiting wide diversity and complexity, said compounds are well-recognized for their biological features, with great potential for use as pharmaceutical therapies and biological research probes. Unfortunately, provision of those compounds is still far from sufficient, especially in view of an increasing demand for preclinical testing. Despite the difficulties to establish dinoflagellate cultures and obtain reasonable productivities of such compounds, intensive research has permitted a number of advances in the field. This paper accordingly reviews the characteristics of some of the most important biotoxins (and other bioactive substances) produced by dinoflagellates. It also presents and discusses (to some length) the main advances pertaining to dinoflagellate production, from bench to large scale-with an emphasis on material published since the latest review available on the subject. Such advances encompass improvements in nutrient formulation and light supply as major operational conditions; they have permitted adaptation of classical designs, and aided the development of novel configurations for dinoflagellate growth-even though shearing-related issues remain a major challenge.
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Affiliation(s)
- Joana Assunção
- LEPABE-Laboratory of Process Engineering, Environment, Biotechnology and Energy, Rua Dr. Roberto Frias, s/n, P-4200-465 Porto, Portugal.
| | - A Catarina Guedes
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos, s/n, P-4450-208 Matosinhos, Portugal.
| | - F Xavier Malcata
- LEPABE-Laboratory of Process Engineering, Environment, Biotechnology and Energy, Rua Dr. Roberto Frias, s/n, P-4200-465 Porto, Portugal.
- Department of Chemical Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, P-4200-465 Porto, Portugal.
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19
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López-Rosales L, García-Camacho F, Sánchez-Mirón A, Contreras-Gómez A, Molina-Grima E. Modeling shear-sensitive dinoflagellate microalgae growth in bubble column photobioreactors. BIORESOURCE TECHNOLOGY 2017; 245:250-257. [PMID: 28892698 DOI: 10.1016/j.biortech.2017.08.161] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 08/20/2017] [Accepted: 08/27/2017] [Indexed: 06/07/2023]
Abstract
The shear-sensitive dinoflagellate microalga Karlodinium veneficum was grown in a sparged bubble column photobioreactor. The influence of mass transfer and shear stress on cell growth and physiology (concentration of reactive oxygen species, membrane fluidity and photosynthetic efficiency) was studied, and a model describing cell growth in term of mass transfer and culture parameters (nozzle sparger diameter, air flow rate, and culture height) was developed. The results show that mass transfer limits cell growth at low air-flow rates, whereas the shear stress produced by the presence of bubbles is critically detrimental for air flow rates above 0.1vvm. The model developed in this paper adequately represents the growth of K. veneficum. Moreover, the parameters of the model indicate that bubble rupture is much more harmful for cells than bubble formation.
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20
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Contreras-Gómez A, Beas-Catena A, Sánchez-Mirón A, García-Camacho F, Molina Grima E. The use of an artificial neural network to model the infection strategy for baculovirus production in suspended insect cell cultures. Cytotechnology 2017; 70:555-565. [PMID: 28779292 DOI: 10.1007/s10616-017-0128-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 07/24/2017] [Indexed: 11/27/2022] Open
Abstract
Since the infection strategy in the baculovirus-insect cell system mostly affects production of the vector itself or the target product, and given that individual infection parameters interact with each other, the optimal combination must be established for each such specific system. In this work an artificial neural network was used to model infection strategy, including the cell concentration at infection, the multiplicity of infection, the medium recycle, and agitation intensity, and to evaluate the relative importance of each factor in the baculovirus production obtained. The results demonstrate that this model can be used to select an optimal infection strategy. For the baculovirus-insect cell system used in this study, this includes low multiplicity of infection and agitation intensity, along with high cell concentration at infection and medium recycle. Our model is superior to regression methods and predicts baculovirus production more precisely, thus meaning that it could be useful for the development of feasible processes, thereby improving process performance and economy.
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Affiliation(s)
| | - Alba Beas-Catena
- Chemical Engineering Area, University of Almería, 04120, Almería, Spain
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Zhou Y, Zhang Y, Li F, Tan L, Wang J. Nutrients structure changes impact the competition and succession between diatom and dinoflagellate in the East China Sea. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 574:499-508. [PMID: 27648528 DOI: 10.1016/j.scitotenv.2016.09.092] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 09/12/2016] [Accepted: 09/12/2016] [Indexed: 06/06/2023]
Abstract
Nutrients variations caused by anthropogenic activities alter phytoplankton community interactions, especially competition and succession between two algal species. East China Sea experiences annual successions of Skeletonema costatum and Prorocentrum donghaiense and large-scale blooms of P. donghaiense. In this study, the growth and competition responses of S. costatum and P. donghaiense to different inorganic nutrients structure were evaluated through field and indoors experiments to further understand the nutrients mechanism of these events. Results showed that low Si/N ratio (Si/N<1) and high N/P (>50) possibly accelerated P. donghaiense outbreak and decreased Si/N caused by low Si concentration could speed up S. costatum decay. Excessive DIN also accelerated blooms dominated by P. donghaiense (Dt up to -3) when S. costatum perished. Increased DIN loads from anthropogenic activities were possibly responsible for the changes in phytoplankton communities and dinoflagellate outbreak when Si concentration decreased as a result of governmental control efforts. With effective management practices for Si and P reductions worldwide, managers should be aware of the negative implications of unsuccessful management of system N loading because N may significantly alter the composition and ecosystem of phytoplankton communities.
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Affiliation(s)
- Yuping Zhou
- Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 266100, PR China; College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China
| | - Yanmin Zhang
- College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China
| | - Fangfang Li
- College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China
| | - Liju Tan
- College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China
| | - Jiangtao Wang
- Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, 266100, PR China; College of Chemistry and Chemical Engineering, Ocean University of China, 266100, PR China.
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Quantitative evaluation of the shear threshold on Carthamus tinctorius L. cell growth with computational fluid dynamics in shaken flask bioreactors. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2016.06.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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23
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Kokkinos D, Dakhil H, Wierschem A, Briesen H, Braun A. Deformation and rupture of Dunaliella salina at high shear rates without the use of thickeners. Biorheology 2016; 53:1-11. [PMID: 26967951 DOI: 10.3233/bir-15057] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND High-density cultures require operating below the critical threshold of shear stress, in order to avoid reducing the specific growth rate of the cells. When determining this threshold, direct inspection of the cells in flow provides insight into the conditions of shearing. OBJECTIVE Aim of this study was using a novel rheo-optical setup for the observation of cells in laminar shear flow and the determination of the critical shear stress required to damage them in their natural environment. METHODS Dunaliella salina cells were sheared and observed in flow for shear stresses of up to 90 Pa, at ambient temperature, without adding thickeners. The critical shear stress was determined by fitting a hydrodynamics-based criterion to the experimental data on the percentage of deformed cells after shearing. RESULTS Single cells, clusters and strings of cells were visible in shear flow. The strings formed at maximum shear stresses of 10 Pa or higher. Cells lost motility for maximum shear stresses higher than 15 Pa, and more than 80% of the cells were deformed at maximum shear stresses higher than 60 Pa. The estimated critical shear stress was 18 Pa. CONCLUSIONS Shear stresses higher than 18 Pa should be avoided when cultivating D. salina.
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Affiliation(s)
- Dimitrios Kokkinos
- Wissenschaftszentrum Weihenstephan für Ernährung und Landnutzung, Lehrstuhl für Systemverfahrenstechnik, Technical University of Munich (TUM), Freising, Germany
| | - Haider Dakhil
- Institute of Fluid Mechanics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany.,Faculty of Engineering, University of Kufa, Kufa, Najaf, Iraq
| | - Andreas Wierschem
- Institute of Fluid Mechanics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Heiko Briesen
- Wissenschaftszentrum Weihenstephan für Ernährung und Landnutzung, Lehrstuhl für Systemverfahrenstechnik, Technical University of Munich (TUM), Freising, Germany
| | - André Braun
- Wissenschaftszentrum Weihenstephan für Ernährung und Landnutzung, Lehrstuhl für Systemverfahrenstechnik, Technical University of Munich (TUM), Freising, Germany
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Gallardo-Rodríguez JJ, López-Rosales L, Sánchez-Mirón A, García-Camacho F, Molina-Grima E, Chalmers JJ. New insights into shear-sensitivity in dinoflagellate microalgae. BIORESOURCE TECHNOLOGY 2016; 200:699-705. [PMID: 26556404 DOI: 10.1016/j.biortech.2015.10.105] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 10/30/2015] [Accepted: 10/31/2015] [Indexed: 06/05/2023]
Abstract
A modification of a flow contraction device was used to subject shear-sensitive microalgae to well-defined hydrodynamic forces. The aim of the study was to elucidate if the inhibition of shear-induced growth commonly observed in dinoflagellate microalgae is in effect due to cell fragility that results in cell breakage even at low levels of turbulence. The microalgae assayed did not show any cell breakage even at energy dissipation rates (EDR) around 10(12)Wm(-3), implausible in culture devices. Conversely, animal cells, tested for comparison purposes, showed high physical cell damage at average EDR levels of 10(7)Wm(-3). Besides, very short exposures to high levels of EDR promoted variations in the membrane fluidity of the microalgae assayed, which might trigger mechanosensory cellular mechanisms. Average EDR values of only about 4·10(5)Wm(-3) increased cell membrane fluidity in microalgae whereas, in animal cells, they did not.
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Affiliation(s)
| | - L López-Rosales
- Chemical Engineering Area, University of Almería, 04120 Almería, Spain
| | - A Sánchez-Mirón
- Chemical Engineering Area, University of Almería, 04120 Almería, Spain
| | - F García-Camacho
- Chemical Engineering Area, University of Almería, 04120 Almería, Spain
| | - E Molina-Grima
- Chemical Engineering Area, University of Almería, 04120 Almería, Spain
| | - J J Chalmers
- Department of Chemical and Biomolecular Engineering, Ohio State University, Columbus, OH 43210, USA
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Michels MHA, van der Goot AJ, Vermuë MH, Wijffels RH. Cultivation of shear stress sensitive and tolerant microalgal species in a tubular photobioreactor equipped with a centrifugal pump. JOURNAL OF APPLIED PHYCOLOGY 2016; 28:53-62. [PMID: 26869745 PMCID: PMC4735255 DOI: 10.1007/s10811-015-0559-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 03/01/2015] [Accepted: 03/02/2015] [Indexed: 05/09/2023]
Abstract
The tolerance to shear stress of Tetraselmis suecica, Isochrysis galbana, Skeletonema costatum, and Chaetoceros muelleri was determined in shear cylinders. The shear tolerance of the microalgae species strongly depends on the strain. I. galbana, S. costatum, and C. muelleri exposed to shear stress between 1.2 and 5.4 Pa resulted in severe cell damage. T. suecica is not sensitive to stresses up to 80 Pa. The possibility to grow these algae in a tubular photobioreactor (PBR) using a centrifugal pump for recirculation of the algae suspension was studied. The shear stresses imposed on the algae in the circulation tubes and at the pressure side of the pump were 0.57 and 1.82 Pa, respectively. The shear stress tolerant T. suecica was successfully cultivated in the PBR. Growth of I. galbana, S. costatum, and C. muelleri in the tubular PBR was not observed, not even at the lowest pumping speed. For the latter shear sensitive strains, the encountered shear stress levels were in the order of magnitude of the determined maximum shear tolerance of the algae. An equation was used to simulate the effect of possible damage of microalgae caused by passages through local high shear zones in centrifugal pumps on the total algae culture in the PBR. This simulation shows that a culture of shear stress sensitive species is bound to collapse after only limited number of passages, confirming the importance of considering shear stress as a process parameter in future design of closed PBRs for microalgal cultivation.
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Affiliation(s)
- Michiel H. A. Michels
- Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, The Netherlands
- HZ University of Applied Sciences, P.O. Box 364, 4380 AJ Vlissingen, The Netherlands
| | - Atze Jan van der Goot
- Food Process Engineering, Wageningen University, P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Marian H. Vermuë
- Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, The Netherlands
| | - René H. Wijffels
- Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, The Netherlands
- Faculty of Biosciences and Aquaculture, University of Nordland, 8049 Bodø, Norway
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26
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López-Rosales L, García-Camacho F, Sánchez-Mirón A, Contreras-Gómez A, Molina-Grima E. An optimisation approach for culturing shear-sensitive dinoflagellate microalgae in bench-scale bubble column photobioreactors. BIORESOURCE TECHNOLOGY 2015; 197:375-382. [PMID: 26348285 DOI: 10.1016/j.biortech.2015.08.087] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 08/15/2015] [Accepted: 08/17/2015] [Indexed: 06/05/2023]
Abstract
The dinoflagellate Karlodinium veneficum was grown in bubble column photobioreactors and a genetic algorithm-based stochastic search strategy used to find optimal values for the culture parameters gas flow rate, culture height, and nozzle sparger diameter. Cell production, concentration of reactive oxygen species (ROS), membrane fluidity and photosynthetic efficiency were studied throughout the culture period. Gas-flow rates below 0.26Lmin(-1), culture heights over 1.25m and a nozzle diameter of 1.5mm were found to provide the optimal conditions for cell growth, with an increase of 60% in cell production with respect to the control culture. Non-optimal conditions produced a sufficiently high shear stress to negatively affect cell growth and even produce cell death. Cell physiology was also severely affected in stressed cultures. The production of ROS increased by up to 200%, whereas cell membrane fluidity decreased by 60% relative to control cultures. Photosynthetic efficiency decreased concomitantly with membrane fluidity.
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Affiliation(s)
- L López-Rosales
- Chemical Engineering Area, University of Almería, 04120 Almería, Spain.
| | - F García-Camacho
- Chemical Engineering Area, University of Almería, 04120 Almería, Spain
| | - A Sánchez-Mirón
- Chemical Engineering Area, University of Almería, 04120 Almería, Spain
| | - A Contreras-Gómez
- Chemical Engineering Area, University of Almería, 04120 Almería, Spain
| | - E Molina-Grima
- Chemical Engineering Area, University of Almería, 04120 Almería, Spain
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27
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Specific oxygen uptake rate as indicator of cell response of Rhodococcus erythropolis cultures to shear effects. Chem Eng Sci 2015. [DOI: 10.1016/j.ces.2014.10.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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28
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Benstein RM, Cebi Z, Podola B, Melkonian M. Immobilized growth of the peridinin-producing marine dinoflagellate Symbiodinium in a simple biofilm photobioreactor. MARINE BIOTECHNOLOGY (NEW YORK, N.Y.) 2014; 16:621-628. [PMID: 24939718 DOI: 10.1007/s10126-014-9581-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2013] [Accepted: 05/28/2014] [Indexed: 06/03/2023]
Abstract
Products from phototrophic dinoflagellates such as toxins or pigments are potentially important for applications in the biomedical sciences, especially in drug development. However, the technical cultivation of these organisms is often problematic due to their sensitivity to hydrodynamic (shear) stress that is a characteristic of suspension-based closed photobioreactors (PBRs). It is thus often thought that most species of dinoflagellates are non-cultivable at a technical scale. Recent advances in the development of biofilm PBRs that rely on immobilization of microalgae may hold potential to circumvent this major technical problem in dinoflagellate cultivation. In the present study, the dinoflagellate Symbiodinium voratum was grown immobilized on a Twin-Layer PBR for isolation of the carotenoid peridinin, an anti-cancerogenic compound. Biomass productivities ranged from 1.0 to 11.0 g m(-2) day(-1) dry matter per vertical growth surface and a maximal biomass yield of 114.5 g m(-2), depending on light intensity, supplementary CO2, and type of substrate (paper or polycarbonate membrane) used. Compared to a suspension culture, the performance of the Twin-Layer PBRs exhibited significantly higher growth rates and maximal biomass yield. In the Twin-Layer PBR a maximal peridinin productivity of 24 mg m(-2) day(-1) was determined at a light intensity of 74 μmol m(-2) s(-1), although the highest peridinin content per dry weight (1.7 % w/w) was attained at lower light intensities. The results demonstrate that a biofilm-based PBR that minimizes hydrodynamic shear forces is applicable to technical-scale cultivation of dinoflagellates and may foster biotechnological applications of these abundant marine protists.
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Affiliation(s)
- Ruben Maximilian Benstein
- Botanisches Institut, Biozentrum Köln, Universität zu Köln, Lehrstuhl 1, Zülpicher Str. 47 b, 50674, Köln, Germany
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Adaptation of the Spodoptera exigua Se301 insect cell line to grow in serum-free suspended culture. Comparison of SeMNPV productivity in serum-free and serum-containing media. Appl Microbiol Biotechnol 2012. [DOI: 10.1007/s00253-012-4576-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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31
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Garcia-Ochoa F, Gomez E, Alcon A, Santos VE. The effect of hydrodynamic stress on the growth of Xanthomonas campestris cultures in a stirred and sparged tank bioreactor. Bioprocess Biosyst Eng 2012; 36:911-25. [DOI: 10.1007/s00449-012-0825-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Accepted: 09/05/2012] [Indexed: 12/27/2022]
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33
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Gallardo-Rodríguez J, Sánchez-Mirón A, García-Camacho F, López-Rosales L, Chisti Y, Molina-Grima E. Bioactives from microalgal dinoflagellates. Biotechnol Adv 2012; 30:1673-84. [PMID: 22884890 DOI: 10.1016/j.biotechadv.2012.07.005] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Revised: 07/27/2012] [Accepted: 07/29/2012] [Indexed: 01/12/2023]
Abstract
Dinoflagellate microalgae are an important source of marine biotoxins. Bioactives from dinoflagellates are attracting increasing attention because of their impact on the safety of seafood and potential uses in biomedical, toxicological and pharmacological research. Here we review the potential applications of dinoflagellate toxins and the methods for producing them. Only sparing quantities of dinoflagellate toxins are generally available and this hinders bioactivity characterization and evaluation in possible applications. Approaches to production of increased quantities of dinoflagellate bioactives are discussed. Although many dinoflagellates are fragile and grow slowly, controlled culture in bioreactors appears to be generally suitable for producing many of the metabolites of interest.
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Gallardo-Rodríguez JJ, García-Camacho F, Sánchez-Mirón A, López-Rosales L, Chisti Y, Molina-Grima E. Shear-induced changes in membrane fluidity during culture of a fragile dinoflagellate microalga. Biotechnol Prog 2011; 28:467-73. [PMID: 22034201 DOI: 10.1002/btpr.737] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 09/21/2011] [Indexed: 12/29/2022]
Abstract
The commonly used shear protective agent Pluronic F68 (PF68) was toxic to the marine dinoflagellate microalga Protoceratium reticulatum, but had a shear-protective effect on it at concentrations of ≤ 0.5 g L(-1) . Supplementation of P. reticulatum cultures with PF68 actually increased the fluidity of the cell membrane; therefore, the shear protective effect of PF68 could not be ascribed to reduced membrane fluidity, an explanation that has been commonly used in relation to its shear protective effect on animal cells. Data are reported on the membrane fluidity of P. reticulatum and its response to the presence of PF68 under sublethal and lethal turbulence regimens. The membrane fluidity was found to depend strongly on the level of lipoperoxides in the cells produced under lethal agitation.
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35
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Beas-Catena A, Sánchez-Mirón A, García-Camacho F, Molina-Grima E. Adaptation of the Se301 insect cell line to suspension culture. Effect of turbulence on growth and on production of nucleopolyhedrovius (SeMNPV). Cytotechnology 2011; 63:543-52. [PMID: 21830050 DOI: 10.1007/s10616-011-9387-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2010] [Accepted: 07/26/2011] [Indexed: 11/29/2022] Open
Abstract
As chemical pesticides are being banned as control agents for agricultural pests, the use of the highly specific, safe to non-target organisms baculoviruses has been proposed. These viruses can be produced either in vivo or in vitro. In vitro production requires appropriated host insect cell lines with the ability for growing as freely-suspended cells. In this work, the Spodoptera exigua Se301 cell line was used to produce the commercially available S. exigua nucleopolyhedrovirus (SeMNPV) in suspension. Se301 cells showed to be very sensitive to the hydrodynamic shear rates developed in bioreactors. A process of progressive adaptation to freely-suspended cultures using protective additives against shear stress and disaggregant was proposed. The best combinations were polyvinyl alcohol (PVA) or polyvinyl pyrrolidone (PVP) with the disaggregant dextran sulfate (DS). Both static and freely-suspended Se301 cell cultures were successfully infected with the SeMNPV baculovirus. Production of occluded baculovirus (OB) increased with the multiplicity of infection (MOI > 0.1).
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Affiliation(s)
- Alba Beas-Catena
- Department of Chemical Engineering, University of Almería, 04120, Almería, Spain
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36
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Michels MHA, van der Goot AJ, Norsker NH, Wijffels RH. Effects of shear stress on the microalgae Chaetoceros muelleri. Bioprocess Biosyst Eng 2010; 33:921-7. [PMID: 20191365 PMCID: PMC2938456 DOI: 10.1007/s00449-010-0415-9] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Accepted: 02/12/2010] [Indexed: 11/30/2022]
Abstract
The effect of shear stress on the viability of Chaetoceros muelleri was studied using a combination of a rheometer and dedicated shearing devices. Different levels of shear stress were applied by varying the shear rates and the medium viscosities. It was possible to quantify the effect of shear stress over a wide range, whilst preserving laminar flow conditions through the use of a thickening agent. The threshold value at which the viability of algae was negatively influenced was between 1 and 1.3 Pa. Beyond the threshold value the viability decreased suddenly to values between 52 and 66%. The effect of shear stress was almost time independent compared to normal microalgae cultivation times. The main shear stress effect was obtained within 1 min, with a secondary effect of up to 8 min.
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Affiliation(s)
- Michiel H A Michels
- Bioprocess Engineering, Wageningen University, P.O. Box 8129, 6700 EV, Wageningen, The Netherlands.
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Carboxymethyl cellulose and Pluronic F68 protect the dinoflagellate Protoceratium reticulatum against shear-associated damage. Bioprocess Biosyst Eng 2010; 34:3-12. [DOI: 10.1007/s00449-010-0441-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Accepted: 05/26/2010] [Indexed: 10/19/2022]
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Gallardo Rodríguez J, Sánchez Mirón A, García Camacho F, Cerón García M, Belarbi E, Molina Grima E. Culture of dinoflagellates in a fed-batch and continuous stirred-tank photobioreactors: Growth, oxidative stress and toxin production. Process Biochem 2010. [DOI: 10.1016/j.procbio.2009.12.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Suresh S, Srivastava VC, Mishra IM. Critical analysis of engineering aspects of shaken flask bioreactors. Crit Rev Biotechnol 2010; 29:255-78. [PMID: 19929318 DOI: 10.3109/07388550903062314] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Shaking bioreactors are the most frequently used reaction vessels in biotechnology. Since their inception, shaking bioreactors have been playing a significant role in medicine, agriculture, food, environmental, and industrial research. In spite of their huge practical importance, very little is known about the characteristic properties of shaken cultures from an engineering point of view. In this paper, a critical analysis is presented of the mixing characteristics, aeration, mass and heat transfer, power consumption, and suitability for on-line monitoring and control of various environmental and other operating parameters in aerated and anaerobic/anoxic conditions. Aspects of cell damage due to shear stress generated in shaken flask and loss of sterility due to contamination are also discussed.
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Affiliation(s)
- S Suresh
- Department of Chemical Engineering, Indian Institute of Technology Roorkee, Uttarakhand, India
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41
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Development of an unsteady-state model for a biological system in miniaturized bioreactors. Biotechnol Appl Biochem 2009; 54:163-70. [DOI: 10.1042/ba20090141] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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42
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Rodríguez JJG, Mirón AS, Camacho FG, García MCC, Belarbi EH, Chisti Y, Grima EM. Causes of shear sensitivity of the toxic dinoflagellateProtoceratium reticulatum. Biotechnol Prog 2009; 25:792-800. [DOI: 10.1002/btpr.161] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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43
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Garcia-Ochoa F, Gomez E. Bioreactor scale-up and oxygen transfer rate in microbial processes: an overview. Biotechnol Adv 2008; 27:153-76. [PMID: 19041387 DOI: 10.1016/j.biotechadv.2008.10.006] [Citation(s) in RCA: 709] [Impact Index Per Article: 44.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2008] [Revised: 10/18/2008] [Accepted: 10/26/2008] [Indexed: 11/16/2022]
Abstract
In aerobic bioprocesses, oxygen is a key substrate; due to its low solubility in broths (aqueous solutions), a continuous supply is needed. The oxygen transfer rate (OTR) must be known, and if possible predicted to achieve an optimum design operation and scale-up of bioreactors. Many studies have been conducted to enhance the efficiency of oxygen transfer. The dissolved oxygen concentration in a suspension of aerobic microorganisms depends on the rate of oxygen transfer from the gas phase to the liquid, on the rate at which oxygen is transported into the cells (where it is consumed), and on the oxygen uptake rate (OUR) by the microorganism for growth, maintenance and production. The gas-liquid mass transfer in a bioprocess is strongly influenced by the hydrodynamic conditions in the bioreactors. These conditions are known to be a function of energy dissipation that depends on the operational conditions, the physicochemical properties of the culture, the geometrical parameters of the bioreactor and also on the presence of oxygen consuming cells. Stirred tank and bubble column (of various types) bioreactors are widely used in a large variety of bioprocesses (such as aerobic fermentation and biological wastewater treatments, among others). Stirred tanks bioreactors provide high values of mass and heat transfer rates and excellent mixing. In these systems, a high number of variables affect the mass transfer and mixing, but the most important among them are stirrer speed, type and number of stirrers and gas flow rate used. In bubble columns and airlifts, the low-shear environment compared to the stirred tanks has enabled successful cultivation of shear sensitive and filamentous cells. Oxygen transfer is often the rate-limiting step in the aerobic bioprocess due to the low solubility of oxygen in the medium. The correct measurement and/or prediction of the volumetric mass transfer coefficient, (k(L)a), is a crucial step in the design, operation and scale-up of bioreactors. The present work is aimed at the reviewing of the oxygen transfer rate (OTR) in bioprocesses to provide a better knowledge about the selection, design, scale-up and development of bioreactors. First, the most used measuring methods are revised; then the main empirical equations, including those using dimensionless numbers, are considered. The possible increasing on OTR due to the oxygen consumption by the cells is taken into account through the use of the biological enhancement factor. Theoretical predictions of both the volumetric mass transfer coefficient and the enhancement factor that have been recently proposed are described; finally, different criteria for bioreactor scale-up are considered in the light of the influence of OTR and OUR affecting the dissolved oxygen concentration in real bioprocess.
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Affiliation(s)
- Felix Garcia-Ochoa
- Dept. Ingeniería Química. Facultad Químicas, Universidad Complutense, 28040-Madrid, Spain.
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