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Huang S, Li J, Wei L, Zheng L, Shi Z, Guo S, Dai B, Zhang D, Zhuang S. A Miniature Modular Fluorescence Flow Cytometry System. BIOSENSORS 2024; 14:395. [PMID: 39194624 DOI: 10.3390/bios14080395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2024] [Revised: 08/13/2024] [Accepted: 08/14/2024] [Indexed: 08/29/2024]
Abstract
Fluorescence flow cytometry is a powerful instrument to distinguish cells or particles labelled with high-specificity fluorophores. However, traditional flow cytometry is complex, bulky, and inconvenient for users to adjust fluorescence channels. In this paper, we present a modular fluorescence flow cytometry (M-FCM) system in which fluorescence channels can be flexibly arranged. Modules for particle focusing and fluorescence detection were developed. After hydrodynamical focusing, the cells were measured in the detection modules, which were integrated with in situ illumination and fluorescence detection. The signal-to-noise ratio of the detection reached to 33.2 dB. The crosstalk among the fluorescence channels was eliminated. The M-FCM system was applied to evaluate cell viability in drug screening, agreeing well with the commercial cytometry. The modular cytometry presents several outstanding features: flexibility in setting fluorescence channels, cost efficiency, compact construction, ease of operation, and the potential to upgrade for multifunctional measurements. The modular cytometry provides a multifunctional platform for various biophysical measurements, e.g., electrical impedance and refractive-index detection. The proposed work paves an innovative avenue for the multivariate analysis of cellular characteristics.
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Affiliation(s)
- Shaoqi Huang
- Engineering Research Center of Optical Instrument and System, the Ministry of Education, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Jiale Li
- Engineering Research Center of Optical Instrument and System, the Ministry of Education, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Li Wei
- Engineering Research Center of Optical Instrument and System, the Ministry of Education, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Lulu Zheng
- Engineering Research Center of Optical Instrument and System, the Ministry of Education, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Zheng Shi
- Department of Gastrointestinal Surgery, The First Affiliated Hospital of Naval Medical University, Shanghai 200433, China
| | - Shiwei Guo
- Department of Hepatobiliary Pancreatic Surgery, The First Affiliated Hospital of Naval Medical University, Shanghai 200433, China
| | - Bo Dai
- Engineering Research Center of Optical Instrument and System, the Ministry of Education, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Dawei Zhang
- Engineering Research Center of Optical Instrument and System, the Ministry of Education, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Songlin Zhuang
- Engineering Research Center of Optical Instrument and System, the Ministry of Education, Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
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Wang D, He Z, Xia H, Huang J, Jin Y, Zhou R, Hao L, Wu C. Engineering acetyl-CoA metabolism to enhance stress tolerance of yeast by regulating membrane functionality. Food Microbiol 2023; 115:104322. [PMID: 37567632 DOI: 10.1016/j.fm.2023.104322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 06/06/2023] [Accepted: 06/11/2023] [Indexed: 08/13/2023]
Abstract
Zygosaccharomyces rouxii has excellent fermentation performance and good tolerance to osmotic stress. Acetyl-CoA is a crucial intermediate precursor in the central carbon metabolic pathway of yeast. This study investigated the effect of engineering acetyl-CoA metabolism on the membrane functionality and stress tolerance of yeast. Firstly, exogenous supplementation of acetyl-CoA improved the biomass and the ability of unsaturated fatty acid synthesis of Z. rouxii under salt stress. Q-PCR results suggested that the gene ACSS (coding acetyl-CoA synthetase) was significantly up-expressed. Subsequently, the gene ACSS from Z. rouxii was transformed and heterologously expressed in S. cerevisiae. The recombinant cells exhibited better multiple stress (salt, acid, heat, and cold) tolerance, higher fatty acid contents, membrane integrity, and fluidity. Our findings may provide a suitable means to enhance the stress tolerance and fermentation efficiency of yeast under harsh fermentation environments.
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Affiliation(s)
- Dingkang Wang
- College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China
| | - Zixi He
- College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China
| | - Huan Xia
- College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China
| | - Jun Huang
- College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China
| | - Yao Jin
- College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China
| | - Rongqing Zhou
- College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China
| | - Liying Hao
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China.
| | - Chongde Wu
- College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China.
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Fermentation Wastes from Chrypthecodinium cohnii Lipid Production for Energy Recovery by Anaerobic Digestion. Processes (Basel) 2022. [DOI: 10.3390/pr10112463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Wastes generated during the cultivation of marine microalga Crypthecodinium cohnii and after the lipid extraction process, were energetically valorized into biogas production through anaerobic digestion (AD). The tested wastes were extracted microalgae (Ae) with hexane (AeH) using supercritical extraction methods (AeS) and the supernatant obtained after culture medium centrifugation (M). The digestion of the algae biomass in the admixture with the supernatant medium (AeH+M+I and AeS+M+I) provided a higher methane content and a higher methane yield (582 and 440 L CH4/kg VS) than the substrates Ae and M, individually digested (155 and 96 L CH4/kg VS, respectively). Flow cytometry monitoring processes during AD indicated that the yield of the accumulated biogas was influenced by the operating conditions. The mixture of AeH+M+I was the only assay with a proportion of cells with less damaged membranes after AD, providing the highest methane yield and productivity (582 L CH4/kg VS and 31 L CH4/kg VS.d, respectively) and the highest energetic potential of 5.8 KWh/kg VS of all the substrates. From the results, AD integration to lipid production by C. cohnii to recover energy from the generated wastes enhanced the sustainability of the entire process and promoted the practice of zero waste.
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Effect of brewery effluent inhibitors on Rhodotorula toruloides NCYC 921 cells grown in pure and mixed cultures at pH 4 and 6. Arch Microbiol 2022; 204:549. [PMID: 35947190 DOI: 10.1007/s00203-022-03153-9] [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: 06/01/2022] [Revised: 07/15/2022] [Accepted: 07/27/2022] [Indexed: 11/02/2022]
Abstract
The presence of inhibitor compounds in the culture medium can cause severe effects on the microorganisms cells. Brewery wastewaters present organic acids (acetic, propionic and butyric acids) which can severely affect yeast cells metabolism, when grown in pure cultures, although in mixed cultures they are able to develop. To understand the physiological changes on Rhodotorula toruloides (formerly Rhodosporidium toruloides) cells when fermenting in the presence of the organic acids present in brewery wastewater, pure and mixed cultures with the microalga Tetradesmus obliquus were performed in a synthetic medium containing the same organic acids concentrations that are present in brewery wastewater at pH 4 and 6. It was concluded that, at pH 4, the organic acids effects in the yeast cells were much more toxic than at pH 6. Moreover, mixed cultures can be an advantage over heterotrophic pure cultures as the microalga is able to contribute for the consumption of potential inhibitors for the yeast.
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Metabolic Engineering Strategies for Improved Lipid Production and Cellular Physiological Responses in Yeast Saccharomyces cerevisiae. J Fungi (Basel) 2022; 8:jof8050427. [PMID: 35628683 PMCID: PMC9144191 DOI: 10.3390/jof8050427] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 04/13/2022] [Accepted: 04/18/2022] [Indexed: 02/01/2023] Open
Abstract
Microbial lipids have been a hot topic in the field of metabolic engineering and synthetic biology due to their increased market and important applications in biofuels, oleochemicals, cosmetics, etc. This review first compares the popular hosts for lipid production and explains the four modules for lipid synthesis in yeast, including the fatty acid biosynthesis module, lipid accumulation module, lipid sequestration module, and fatty acid modification module. This is followed by a summary of metabolic engineering strategies that could be used for enhancing each module for lipid production. In addition, the efforts being invested in improving the production of value-added fatty acids in engineered yeast, such as cyclopropane fatty acid, ricinoleic acid, gamma linoleic acid, EPA, and DHA, are included. A discussion is further made on the potential relationships between lipid pathway engineering and consequential changes in cellular physiological properties, such as cell membrane integrity, intracellular reactive oxygen species level, and mitochondrial membrane potential. Finally, with the rapid development of synthetic biology tools, such as CRISPR genome editing tools and machine learning models, this review proposes some future trends that could be employed to engineer yeast with enhanced intracellular lipid production while not compromising much of its cellular health.
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Ferreira A, Figueiredo D, Ferreira F, Ribeiro B, Reis A, da Silva TL, Gouveia L. Impact of High-Pressure Homogenization on the Cell Integrity of Tetradesmus obliquus and Seed Germination. Molecules 2022; 27:2275. [PMID: 35408674 PMCID: PMC9000265 DOI: 10.3390/molecules27072275] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 03/18/2022] [Accepted: 03/29/2022] [Indexed: 11/17/2022] Open
Abstract
Microalgae have almost unlimited applications due to their versatility and robustness to grow in different environmental conditions, their biodiversity and variety of valuable bioactive compounds. Wastewater can be used as a low-cost and readily available medium for microalgae, while the latter removes the pollutants to produce clean water. Nevertheless, since the most valuable metabolites are mainly located inside the microalga cell, their release implies rupturing the cell wall. In this study, Tetradesmus obliquus grown in 5% piggery effluent was disrupted using high-pressure homogenization (HPH). Effects of HPH pressure (100, 300, and 600 bar) and cycles (1, 2 and 3) were tested on the membrane integrity and evaluated using flow cytometry and microscopy. In addition, wheat seed germination trials were carried out using the biomass at different conditions. Increased HPH pressure or number of cycles led to more cell disruption (75% at 600 bar and 3 cycles). However, the highest increase in wheat germination and growth (40-45%) was observed at the lowest pressure (100 bar), where only 46% of the microalga cells were permeabilised, but not disrupted. Non-treated T. obliquus cultures also revealed an enhancing effect on root and shoot length (up to 40%). The filtrate of the initial culture also promoted shoot development compared to water (21%), reinforcing the full use of all the process fractions. Thus, piggery wastewater can be used to produce microalgae biomass, and mild HPH conditions can promote cell permeabilization to release sufficient amounts of bioactive compounds with the ability to enhance plant germination and growth, converting an economic and environmental concern into environmentally sustainable applications.
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Affiliation(s)
- Alice Ferreira
- LNEG—UBB—National Laboratory of Energy and Geology I.P., Bioenergy and Biorefineries Unit, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, Portugal; (A.F.); (F.F.); (B.R.); (A.R.); (T.L.d.S.)
| | - Daniel Figueiredo
- GreenCoLab—Green Ocean Technologies and Products Collaborative Laboratory, CCMAR, Algarve University, 8005-139 Faro, Portugal;
| | - Francisca Ferreira
- LNEG—UBB—National Laboratory of Energy and Geology I.P., Bioenergy and Biorefineries Unit, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, Portugal; (A.F.); (F.F.); (B.R.); (A.R.); (T.L.d.S.)
| | - Belina Ribeiro
- LNEG—UBB—National Laboratory of Energy and Geology I.P., Bioenergy and Biorefineries Unit, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, Portugal; (A.F.); (F.F.); (B.R.); (A.R.); (T.L.d.S.)
| | - Alberto Reis
- LNEG—UBB—National Laboratory of Energy and Geology I.P., Bioenergy and Biorefineries Unit, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, Portugal; (A.F.); (F.F.); (B.R.); (A.R.); (T.L.d.S.)
| | - Teresa Lopes da Silva
- LNEG—UBB—National Laboratory of Energy and Geology I.P., Bioenergy and Biorefineries Unit, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, Portugal; (A.F.); (F.F.); (B.R.); (A.R.); (T.L.d.S.)
| | - Luisa Gouveia
- LNEG—UBB—National Laboratory of Energy and Geology I.P., Bioenergy and Biorefineries Unit, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, Portugal; (A.F.); (F.F.); (B.R.); (A.R.); (T.L.d.S.)
- GreenCoLab—Green Ocean Technologies and Products Collaborative Laboratory, CCMAR, Algarve University, 8005-139 Faro, Portugal;
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Abstract
Spermatozoa must possess many attributes to fertilize an egg but few laboratory methods can assess all of these attributes simultaneously and objectively. Most laboratory methods used to assess the quality of semen in veterinary andrology can be inaccurate and time-consuming. Laboratory techniques which evaluate only one sperm attribute, often provide results that have a weak correlation with fertility. Therefore, semen used for artificial insemination should not be assessed based on the results of one method only but rather on the comprehensive results of several laboratory tests. Flow cytometry is a modern method of analysing diJ169fferent types of cells, including sperm cells. It is based on the scattering of light and fluorescence, the outcome of which yields results that are recorded and evaluated by computer technology which makes an objective assessment. Flow cytometry in combination with fluorescence microscopy and fluorescent probes provides a comprehensive, accurate, objective, and rapid analysis of the ejaculate. In a short time frame it allows us to test thousands of sperm for their structure and properties, even with a minimal amount of semen. This method enables the evaluation of several indicators simultaneously in a population of sperm as a whole or for each sperm individually. It informs us about the selected indicators of sperm quality in the sample by examining the membrane integrity, DNA, mitochondria, acrosome, oxidative stress, and other properties. Flow cytometry has become an important method of evaluating the functional and morphological properties of sperm and is used for research in veterinary science as well as for a routine assessment of the semen quality.
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Mauerhofer LM, Pappenreiter P, Paulik C, Seifert AH, Bernacchi S, Rittmann SKMR. Methods for quantification of growth and productivity in anaerobic microbiology and biotechnology. Folia Microbiol (Praha) 2019; 64:321-360. [PMID: 30446943 PMCID: PMC6529396 DOI: 10.1007/s12223-018-0658-4] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 10/12/2018] [Indexed: 12/17/2022]
Abstract
Anaerobic microorganisms (anaerobes) possess a fascinating metabolic versatility. This characteristic makes anaerobes interesting candidates for physiological studies and utilizable as microbial cell factories. To investigate the physiological characteristics of an anaerobic microbial population, yield, productivity, specific growth rate, biomass production, substrate uptake, and product formation are regarded as essential variables. The determination of those variables in distinct cultivation systems may be achieved by using different techniques for sampling, measuring of growth, substrate uptake, and product formation kinetics. In this review, a comprehensive overview of methods is presented, and the applicability is discussed in the frame of anaerobic microbiology and biotechnology.
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Affiliation(s)
- Lisa-Maria Mauerhofer
- Archaea Physiology & Biotechnology Group, Archaea Biology and Ecogenomics Division, Department of Ecogenomics and Systems Biology, Universität Wien, Althanstraße 14, 1090, Wien, Austria
| | - Patricia Pappenreiter
- Institute for Chemical Technology of Organic Materials, Johannes Kepler University Linz, Linz, Austria
| | - Christian Paulik
- Institute for Chemical Technology of Organic Materials, Johannes Kepler University Linz, Linz, Austria
| | | | | | - Simon K-M R Rittmann
- Archaea Physiology & Biotechnology Group, Archaea Biology and Ecogenomics Division, Department of Ecogenomics and Systems Biology, Universität Wien, Althanstraße 14, 1090, Wien, Austria.
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Assemany P, Marques IDP, Calijuri ML, Lopes da Silva T, Reis A. Energetic valorization of algal biomass in a hybrid anaerobic reactor. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 209:308-315. [PMID: 29306840 DOI: 10.1016/j.jenvman.2017.12.054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 12/13/2017] [Accepted: 12/20/2017] [Indexed: 06/07/2023]
Abstract
This study evaluated the operation of a hybrid anaerobic reactor fed with algal biomass cultivated in effluent from the brewery industry. Three stages of operation were distinguished during the 72 days of semi-continuous functioning of the reactor: Stage 1 (S1), in which algal biomass was used as substrate; Stage 2 (S2), in which 10% (v/v) of the algal biomass was substituted by olive mill wastewater (OMW); and Stage 3 (S3), in which algal biomass was heat pre-treated. During S1, a loss of solids was observed, with an increment of organic matter in the outlet. The substitution of 10% of the volume of algal biomass by OMW tripled the methane productivity obtained in the previous stage by digestion of pure algal biomass. Heat pre-treatment was not efficient in rupturing the cell wall, and consequently did not have any effect on the increase in biogas production. The complementarity of substrates in the assessed conditions led to better results than the pre-treatment of the algal biomass.
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Affiliation(s)
- Paula Assemany
- Universidade Federal de Viçosa/Civil Department, Avenida PH Rolfs s/n, 36570-900, Viçosa, MG, Brazil.
| | - Isabel de Paula Marques
- LNEG, National Laboratory of Energy and Geology/Bioenergy Unit, Estrada do Paço do Lumiar 22, 1649-038, Lisbon, Portugal
| | - Maria Lúcia Calijuri
- Universidade Federal de Viçosa/Civil Department, Avenida PH Rolfs s/n, 36570-900, Viçosa, MG, Brazil
| | - Teresa Lopes da Silva
- LNEG, National Laboratory of Energy and Geology/Bioenergy Unit, Estrada do Paço do Lumiar 22, 1649-038, Lisbon, Portugal
| | - Alberto Reis
- LNEG, National Laboratory of Energy and Geology/Bioenergy Unit, Estrada do Paço do Lumiar 22, 1649-038, Lisbon, Portugal
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Buysschaert B, Kerckhof FM, Vandamme P, De Baets B, Boon N. Flow cytometric fingerprinting for microbial strain discrimination and physiological characterization. Cytometry A 2017; 93:201-212. [DOI: 10.1002/cyto.a.23302] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 07/16/2017] [Accepted: 11/30/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Benjamin Buysschaert
- Center for Microbial Ecology and Technology (CMET), Department of Biochemical and Microbial Technology; Ghent University, Coupure links 653; Ghent B-9000 Belgium
| | - Frederiek-Maarten Kerckhof
- Center for Microbial Ecology and Technology (CMET), Department of Biochemical and Microbial Technology; Ghent University, Coupure links 653; Ghent B-9000 Belgium
| | - Peter Vandamme
- Laboratory of Microbiology (LM-UGent); Ghent University, K. L. Ledeganckstraat 35; Ghent B-9000 Belgium
| | - Bernard De Baets
- Department of Mathematical Modeling, Statistics and Bioinformatics (Biomath); Ghent University, Coupure links 653; Ghent B-9000 Belgium
| | - Nico Boon
- Center for Microbial Ecology and Technology (CMET), Department of Biochemical and Microbial Technology; Ghent University, Coupure links 653; Ghent B-9000 Belgium
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Influence of culture conditions towards optimal carotenoid production by Gordonia alkanivorans strain 1B. Bioprocess Biosyst Eng 2017; 41:143-155. [DOI: 10.1007/s00449-017-1853-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 10/10/2017] [Indexed: 01/27/2023]
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Bharathiraja B, Sowmya V, Sridharan S, Yuvaraj D, Jayamuthunagai J, Praveenkumar R. Biodiesel production from microbial oil derived from wood isolate Trichoderma reesei. BIORESOURCE TECHNOLOGY 2017; 239:538-541. [PMID: 28549810 DOI: 10.1016/j.biortech.2017.05.078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 05/11/2017] [Accepted: 05/13/2017] [Indexed: 06/07/2023]
Abstract
In the present study Trichoderma reesei, a wood isolate can yield high biomass quantities up to 30g/L, yielding 32.4% of lipids of dry cell weight (DCW). Biodiesel production from Trichoderma reesei involved simple unit operations like filtration and ultrasonication, yet giving good lipid yield with desirable bio-diesel properties. Optimization of ultrasonication conditions was done to ensure maximum lipid extraction. SEM analysis of ultrasonicated samples showed distinct breakage of fungal hyphae. The lipids were found to contain 49.7% saturated fatty acids. Transesterification using chemical and biological catalysts were compared and 96.09% efficiency was observed for lipase-catalyzed transesterification. The bio-diesel properties satisfied ASTM and EN specifications with cetane number: 53.1, iodine value: 63.34g, saponification value: 235.07mg KOH/g, cold flow plugging point: 9.13°C.
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Affiliation(s)
- B Bharathiraja
- Vel Tech High Tech Dr. Rangarajan Dr. Sakunthala Engineering College, Avadi, Chennai 600062, India.
| | - V Sowmya
- Vel Tech High Tech Dr. Rangarajan Dr. Sakunthala Engineering College, Avadi, Chennai 600062, India
| | - Sridevi Sridharan
- Vel Tech High Tech Dr. Rangarajan Dr. Sakunthala Engineering College, Avadi, Chennai 600062, India
| | - D Yuvaraj
- Vel Tech High Tech Dr. Rangarajan Dr. Sakunthala Engineering College, Avadi, Chennai 600062, India
| | - J Jayamuthunagai
- Centre for Biotechnology, Anna University, Chennai 600025, India
| | - R Praveenkumar
- Department of Biotechnology, Arunai Engineering College, Tiruvannamalai 606603, India
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Cruyt F, Sousa CA, Machado MD, Soares EV. Improvement of the slide culture technique for the assessment of yeast viability. JOURNAL OF THE INSTITUTE OF BREWING 2017. [DOI: 10.1002/jib.400] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Frederik Cruyt
- Bioengineering Laboratory-CIETI, Chemical Engineering Department, ISEP-School of Engineering of Polytechnic Institute of Porto; 4200-072 Porto Portugal
- KU Leuven, Faculty of Engineering Technology; B-9000 Ghent Belgium
| | - Cátia A. Sousa
- Bioengineering Laboratory-CIETI, Chemical Engineering Department, ISEP-School of Engineering of Polytechnic Institute of Porto; 4200-072 Porto Portugal
- REQUIMTE/LAQV, Chemical Engineering Department, Faculty of Engineering, University of Porto; 4200-465 Porto Portugal
- CEB-Centre of Biological Engineering, University of Minho; 4710-057 Braga Portugal
| | - Manuela D. Machado
- Bioengineering Laboratory-CIETI, Chemical Engineering Department, ISEP-School of Engineering of Polytechnic Institute of Porto; 4200-072 Porto Portugal
- CEB-Centre of Biological Engineering, University of Minho; 4710-057 Braga Portugal
| | - Eduardo V. Soares
- Bioengineering Laboratory-CIETI, Chemical Engineering Department, ISEP-School of Engineering of Polytechnic Institute of Porto; 4200-072 Porto Portugal
- CEB-Centre of Biological Engineering, University of Minho; 4710-057 Braga Portugal
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15
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Dammak M, Haase SM, Miladi R, Ben Amor F, Barkallah M, Gosset D, Pichon C, Huchzermeyer B, Fendri I, Denis M, Abdelkafi S. Enhanced lipid and biomass production by a newly isolated and identified marine microalga. Lipids Health Dis 2016; 15:209. [PMID: 27919272 PMCID: PMC5139129 DOI: 10.1186/s12944-016-0375-4] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Accepted: 11/11/2016] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND The increasing demand for microalgae lipids as an alternative to fish has encouraged researchers to explore oleaginous microalgae for food uses. In this context, optimization of growth and lipid production by the marine oleaginous V2-strain-microalgae is of great interest as it contains large amounts of mono-unsaturated (MUFAs) and poly-unsaturated fatty acids (PUFAs). METHODS In this study, the isolated V2 strain was identified based on 23S rRNA gene. Growth and lipid production conditions were optimized by using the response surface methodology in order to maximize its cell growth and lipid content that was quantified by both flow cytometry and the gravimetric method. The intracellular lipid bodies were detected after staining with Nile red by epifluorescence microscopy. The fatty acid profile of optimal culture conditions was determined by gas chromatography coupled to a flame ionization detector. RESULTS The phenotypic and phylogenetic analyses showed that the strain V2 was affiliated to Tetraselmis genus. The marine microalga is known as an interesting oleaginous species according to its high lipid production and its fatty acid composition. The optimization process showed that maximum cell abundance was achieved under the following conditions: pH: 7, salinity: 30 and photosynthetic light intensity (PAR): 133 μmol photons.m-2.s-1. In addition, the highest lipid content (49 ± 2.1% dry weight) was obtained at pH: 7, salinity: 37.23 and photosynthetic light intensity (PAR): 188 μmol photons.m-2.s-1. The fatty acid profile revealed the presence of 39.2% and 16.1% of total fatty acids of mono-unsaturated fatty acids (MUFAs) and poly-unsaturated fatty acids (PUFAs), respectively. Omega 3 (ω3), omega 6 (ω6) and omega 9 (ω9) represented 5.28%, 8.12% and 32.8% of total fatty acids, respectively. CONCLUSIONS This study showed the successful optimization of salinity, light intensity and pH for highest growth, lipid production and a good fatty acid composition, making strain V2 highly suitable for food and nutraceutical applications.
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Affiliation(s)
- Mouna Dammak
- Biotechnologie des Algues, Biological Engineering Department, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia
| | - Sandra Mareike Haase
- Institute of Horticultural Production Systems, Section Biosystems Engineering, Leibniz University Hannover, Herrenhauser Str. 2, 30419, Hannover, Germany
| | - Ramzi Miladi
- Biotechnologie des Algues, Biological Engineering Department, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia
| | - Faten Ben Amor
- Biotechnologie des Algues, Biological Engineering Department, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia
| | - Mohamed Barkallah
- Biotechnologie des Algues, Biological Engineering Department, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia
| | - David Gosset
- Center for Molecular Biophysics (CBM), CNRS UPR4301, Orléans, France
| | - Chantal Pichon
- Center for Molecular Biophysics (CBM), CNRS UPR4301, Orléans, France
| | - Bernhard Huchzermeyer
- Institute of Botany, Leibniz Universitaet Hannover, Herrenhauser Str. 2, 30419, Hannover, Germany
| | - Imen Fendri
- Unit Research of Toxicology-Microbiology Environmental and Health UR11ES70, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Michel Denis
- Aix Marseille Université, Université de Toulon, CNRS/INSU, IRD, Institut Méditerranéen d'Océanologie (MIO), 163 avenue de Luminy, Case 901, 13288, Marseille Cedex 09, France
| | - Slim Abdelkafi
- Biotechnologie des Algues, Biological Engineering Department, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia.
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Rosnow JJ, Anderson LN, Nair RN, Baker ES, Wright AT. Profiling microbial lignocellulose degradation and utilization by emergent omics technologies. Crit Rev Biotechnol 2016; 37:626-640. [PMID: 27439855 DOI: 10.1080/07388551.2016.1209158] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The use of plant materials to generate renewable biofuels and other high-value chemicals is the sustainable and preferable option, but will require considerable improvements to increase the rate and efficiency of lignocellulose depolymerization. This review highlights novel and emerging technologies that are being developed and deployed to characterize the process of lignocellulose degradation. The review will also illustrate how microbial communities deconstruct and metabolize lignocellulose by identifying the necessary genes and enzyme activities along with the reaction products. These technologies include multi-omic measurements, cell sorting and isolation, nuclear magnetic resonance spectroscopy (NMR), activity-based protein profiling, and direct measurement of enzyme activity. The recalcitrant nature of lignocellulose necessitates the need to characterize the methods microbes employ to deconstruct lignocellulose to inform new strategies on how to greatly improve biofuel conversion processes. New technologies are yielding important insights into microbial functions and strategies employed to degrade lignocellulose, providing a mechanistic blueprint in order to advance biofuel production.
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Affiliation(s)
- Joshua J Rosnow
- a Biological Sciences Division , Pacific Northwest National Laboratory , Richland , WA , USA
| | - Lindsey N Anderson
- a Biological Sciences Division , Pacific Northwest National Laboratory , Richland , WA , USA
| | - Reji N Nair
- a Biological Sciences Division , Pacific Northwest National Laboratory , Richland , WA , USA
| | - Erin S Baker
- a Biological Sciences Division , Pacific Northwest National Laboratory , Richland , WA , USA
| | - Aaron T Wright
- a Biological Sciences Division , Pacific Northwest National Laboratory , Richland , WA , USA
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Challagulla V, Nayar S, Walsh K, Fabbro L. Advances in techniques for assessment of microalgal lipids. Crit Rev Biotechnol 2016; 37:566-578. [PMID: 27417693 DOI: 10.1080/07388551.2016.1206058] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Microalgae are a varied group of organisms with considerable commercial potential as sources of various biochemicals, storage molecules and metabolites such as lipids, sugars, amino acids, pigments and toxins. Algal lipids can be processed to bio-oils and biodiesel. The conventional method to estimate algal lipids is based on extraction using solvents and quantification by gravimetry or chromatography. Such methods are time consuming, use hazardous chemicals and are labor intensive. For rapid screening of prospective algae or for management decisions (e.g. decision on timing of harvest), a rapid, high throughput, reliable, accurate, cost effective and preferably nondestructive analytical technique is desirable. This manuscript reviews the application of fluorescent lipid soluble dyes (Nile Red and BODIPY 505/515), nuclear magnetic resonance (NMR), Raman, Fourier transform infrared (FTIR) and near infrared (NIR) spectroscopy for the assessment of lipids in microalgae.
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Affiliation(s)
- Vineela Challagulla
- a School of Medical and Applied Sciences , Central Queensland University , Rockhampton , QLD , Australia
| | - Sasi Nayar
- b South Australian Research and Development Institute - Aquatic Sciences , West Beach , South Australia , Australia
| | - Kerry Walsh
- a School of Medical and Applied Sciences , Central Queensland University , Rockhampton , QLD , Australia
| | - Larelle Fabbro
- a School of Medical and Applied Sciences , Central Queensland University , Rockhampton , QLD , Australia
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18
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Capus A, Monnerat M, Ribeiro LC, de Souza W, Martins JL, Sant'Anna C. Application of high-content image analysis for quantitatively estimating lipid accumulation in oleaginous yeasts with potential for use in biodiesel production. BIORESOURCE TECHNOLOGY 2016; 203:309-317. [PMID: 26744805 DOI: 10.1016/j.biortech.2015.12.067] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 12/19/2015] [Accepted: 12/21/2015] [Indexed: 06/05/2023]
Abstract
Biodiesel from oleaginous microorganisms is a viable substitute for a fossil fuel. Current methods for microorganism lipid productivity evaluation do not analyze lipid dynamics in single cells. Here, we described a high-content image analysis (HCA) as a promising strategy for screening oleaginous microorganisms for biodiesel production, while generating single-cell lipid dynamics data in large cell density. Rhodotorula slooffiae yeast were grown in standard (CTL) or lipid trigger medium (LTM), and lipid droplet (LD) accumulation was analyzed in deconvolved confocal microscopy images of cells stained with the lipophilic fluorescent Nile red (NR) dye using automated cell and LD segmentation. The 'vesicle segmentation' method yielded valid morphometric results for limited lipid accumulation in smaller LDs (CTL samples) and for high lipid accumulation in larger LDs (LTM samples), and detected LD localization changes. Thus, HCA can be used to analyze the lipid accumulation patterns likely to be encountered in screens for biodiesel production.
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Affiliation(s)
- Aurélie Capus
- Laboratory of Biotechnology - Labio, Directory of Metrology Applied to Life Science - Dimav, National Institute of Metrology, Quality and Technology - Inmetro, Duque de Caxias, RJ, Brazil; Agrocampus Ouest, Rennes, France; Université Rennes, Rennes, France
| | - Marianne Monnerat
- Laboratory of Biotechnology - Labio, Directory of Metrology Applied to Life Science - Dimav, National Institute of Metrology, Quality and Technology - Inmetro, Duque de Caxias, RJ, Brazil
| | - Luiz Carlos Ribeiro
- Laboratory of Biotechnology - Labio, Directory of Metrology Applied to Life Science - Dimav, National Institute of Metrology, Quality and Technology - Inmetro, Duque de Caxias, RJ, Brazil
| | - Wanderley de Souza
- Laboratory of Cellular Ultrastructure Hertha Meyer, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil; National Institute of Structure Biology and Bioimaging, Rio de Janeiro, RJ, Brazil
| | - Juliana Lopes Martins
- Laboratory of Biotechnology - Labio, Directory of Metrology Applied to Life Science - Dimav, National Institute of Metrology, Quality and Technology - Inmetro, Duque de Caxias, RJ, Brazil
| | - Celso Sant'Anna
- Laboratory of Biotechnology - Labio, Directory of Metrology Applied to Life Science - Dimav, National Institute of Metrology, Quality and Technology - Inmetro, Duque de Caxias, RJ, Brazil; National Institute of Structure Biology and Bioimaging, Rio de Janeiro, RJ, Brazil.
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19
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Parreira TM, Freitas C, Reis A, Roseiro J, da Silva TL. Carbon concentration and oxygen availability affect lipid and carotenoid production by carob pulp syrup-grownRhodosporidium toruloidesNCYC 921. Eng Life Sci 2015. [DOI: 10.1002/elsc.201500002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
| | - Claudia Freitas
- Unidade de Bioenergia; Laboratório Nacional de Energia e Geologia; Lisboa Portugal
| | - Alberto Reis
- Unidade de Bioenergia; Laboratório Nacional de Energia e Geologia; Lisboa Portugal
| | - José Roseiro
- Unidade de Bioenergia; Laboratório Nacional de Energia e Geologia; Lisboa Portugal
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20
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Currin A, Swainston N, Day PJ, Kell DB. Synthetic biology for the directed evolution of protein biocatalysts: navigating sequence space intelligently. Chem Soc Rev 2015; 44:1172-239. [PMID: 25503938 PMCID: PMC4349129 DOI: 10.1039/c4cs00351a] [Citation(s) in RCA: 251] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Indexed: 12/21/2022]
Abstract
The amino acid sequence of a protein affects both its structure and its function. Thus, the ability to modify the sequence, and hence the structure and activity, of individual proteins in a systematic way, opens up many opportunities, both scientifically and (as we focus on here) for exploitation in biocatalysis. Modern methods of synthetic biology, whereby increasingly large sequences of DNA can be synthesised de novo, allow an unprecedented ability to engineer proteins with novel functions. However, the number of possible proteins is far too large to test individually, so we need means for navigating the 'search space' of possible protein sequences efficiently and reliably in order to find desirable activities and other properties. Enzymologists distinguish binding (Kd) and catalytic (kcat) steps. In a similar way, judicious strategies have blended design (for binding, specificity and active site modelling) with the more empirical methods of classical directed evolution (DE) for improving kcat (where natural evolution rarely seeks the highest values), especially with regard to residues distant from the active site and where the functional linkages underpinning enzyme dynamics are both unknown and hard to predict. Epistasis (where the 'best' amino acid at one site depends on that or those at others) is a notable feature of directed evolution. The aim of this review is to highlight some of the approaches that are being developed to allow us to use directed evolution to improve enzyme properties, often dramatically. We note that directed evolution differs in a number of ways from natural evolution, including in particular the available mechanisms and the likely selection pressures. Thus, we stress the opportunities afforded by techniques that enable one to map sequence to (structure and) activity in silico, as an effective means of modelling and exploring protein landscapes. Because known landscapes may be assessed and reasoned about as a whole, simultaneously, this offers opportunities for protein improvement not readily available to natural evolution on rapid timescales. Intelligent landscape navigation, informed by sequence-activity relationships and coupled to the emerging methods of synthetic biology, offers scope for the development of novel biocatalysts that are both highly active and robust.
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Affiliation(s)
- Andrew Currin
- Manchester Institute of Biotechnology , The University of Manchester , 131, Princess St , Manchester M1 7DN , UK . ; http://dbkgroup.org/; @dbkell ; Tel: +44 (0)161 306 4492
- School of Chemistry , The University of Manchester , Manchester M13 9PL , UK
- Centre for Synthetic Biology of Fine and Speciality Chemicals (SYNBIOCHEM) , The University of Manchester , 131, Princess St , Manchester M1 7DN , UK
| | - Neil Swainston
- Manchester Institute of Biotechnology , The University of Manchester , 131, Princess St , Manchester M1 7DN , UK . ; http://dbkgroup.org/; @dbkell ; Tel: +44 (0)161 306 4492
- Centre for Synthetic Biology of Fine and Speciality Chemicals (SYNBIOCHEM) , The University of Manchester , 131, Princess St , Manchester M1 7DN , UK
- School of Computer Science , The University of Manchester , Manchester M13 9PL , UK
| | - Philip J. Day
- Manchester Institute of Biotechnology , The University of Manchester , 131, Princess St , Manchester M1 7DN , UK . ; http://dbkgroup.org/; @dbkell ; Tel: +44 (0)161 306 4492
- Centre for Synthetic Biology of Fine and Speciality Chemicals (SYNBIOCHEM) , The University of Manchester , 131, Princess St , Manchester M1 7DN , UK
- Faculty of Medical and Human Sciences , The University of Manchester , Manchester M13 9PT , UK
| | - Douglas B. Kell
- Manchester Institute of Biotechnology , The University of Manchester , 131, Princess St , Manchester M1 7DN , UK . ; http://dbkgroup.org/; @dbkell ; Tel: +44 (0)161 306 4492
- School of Chemistry , The University of Manchester , Manchester M13 9PL , UK
- Centre for Synthetic Biology of Fine and Speciality Chemicals (SYNBIOCHEM) , The University of Manchester , 131, Princess St , Manchester M1 7DN , UK
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Havlik I, Scheper T, Reardon KF. Monitoring of Microalgal Processes. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2015; 153:89-142. [PMID: 26289537 DOI: 10.1007/10_2015_328] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Process monitoring, which can be defined as the measurement of process variables with the smallest possible delay, is combined with process models to form the basis for successful process control. Minimizing the measurement delay leads inevitably to employing online, in situ sensors where possible, preferably using noninvasive measurement methods with stable, low-cost sensors. Microalgal processes have similarities to traditional bioprocesses but also have unique monitoring requirements. In general, variables to be monitored in microalgal processes can be categorized as physical, chemical, and biological, and they are measured in gaseous, liquid, and solid (biological) phases. Physical and chemical process variables can be usually monitored online using standard industrial sensors. The monitoring of biological process variables, however, relies mostly on sensors developed and validated using laboratory-scale systems or uses offline methods because of difficulties in developing suitable online sensors. Here, we review current technologies for online, in situ monitoring of all types of process parameters of microalgal cultivations, with a focus on monitoring of biological parameters. We discuss newly introduced methods for measuring biological parameters that could be possibly adapted for routine online use, should be preferably noninvasive, and are based on approaches that have been proven in other bioprocesses. New sensor types for measuring physicochemical parameters using optical methods or ion-specific field effect transistor (ISFET) sensors are also discussed. Reviewed methods with online implementation or online potential include measurement of irradiance, biomass concentration by optical density and image analysis, cell count, chlorophyll fluorescence, growth rate, lipid concentration by infrared spectrophotometry, dielectric scattering, and nuclear magnetic resonance. Future perspectives are discussed, especially in the field of image analysis using in situ microscopy, infrared spectrophotometry, and software sensor systems.
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Affiliation(s)
- Ivo Havlik
- Institute of Technical Chemistry, Leibniz University Hannover, Callinstrasse 5, 30167, Hannover, Germany.
| | - Thomas Scheper
- Institute of Technical Chemistry, Leibniz University Hannover, Callinstrasse 5, 30167, Hannover, Germany
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22
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Lebuhn M, Weiß S, Munk B, Guebitz GM. Microbiology and Molecular Biology Tools for Biogas Process Analysis, Diagnosis and Control. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2015; 151:1-40. [PMID: 26337842 DOI: 10.1007/978-3-319-21993-6_1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Many biotechnological processes such as biogas production or defined biotransformations are carried out by microorganisms or tightly cooperating microbial communities. Process breakdown is the maximum credible accident for the operator. Any time savings that can be provided by suitable early-warning systems and allow for specific countermeasures are of great value. Process disturbance, frequently due to nutritional shortcomings, malfunction or operational deficits, is evidenced conventionally by process chemistry parameters. However, knowledge on systems microbiology and its function has essentially increased in the last two decades, and molecular biology tools, most of which are directed against nucleic acids, have been developed to analyze and diagnose the process. Some of these systems have been shown to indicate changes of the process status considerably earlier than the conventionally applied process chemistry parameters. This is reasonable because the triggering catalyst is determined, activity changes of the microbes that perform the reaction. These molecular biology tools have thus the potential to add to and improve the established process diagnosis system. This chapter is dealing with the actual state of the art of biogas process analysis in practice, and introduces molecular biology tools that have been shown to be of particular value in complementing the current systems of process monitoring and diagnosis, with emphasis on nucleic acid targeted molecular biology systems.
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Affiliation(s)
- Michael Lebuhn
- Department for Quality Assurance and Analytics, Bavarian State Research Center for Agriculture (LfL), Lange Point 6, 85354, Freising, Germany
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23
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Monitoring growth and lipid production of new isolated oleaginous yeast Cryptococcus aerius UIMC65 on glucose and xylose cultures. BIOTECHNOL BIOPROC E 2014. [DOI: 10.1007/s12257-014-0007-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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24
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Teixeira AV, Paixão SM, da Silva TL, Alves L. Influence of the Carbon Source on Gordonia alkanivorans Strain 1B Resistance to 2-Hydroxybiphenyl Toxicity. Appl Biochem Biotechnol 2014; 173:870-82. [DOI: 10.1007/s12010-014-0902-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 04/02/2014] [Indexed: 11/27/2022]
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25
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Nikel PI, Silva-Rocha R, Benedetti I, de Lorenzo V. The private life of environmental bacteria: pollutant biodegradation at the single cell level. Environ Microbiol 2014; 16:628-42. [DOI: 10.1111/1462-2920.12360] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 11/23/2013] [Accepted: 12/10/2013] [Indexed: 11/28/2022]
Affiliation(s)
- Pablo Iván Nikel
- Systems and Synthetic Biology Program; Centro Nacional de Biotecnología (CNB-CSIC); Madrid 28049 Spain
| | - Rafael Silva-Rocha
- Systems and Synthetic Biology Program; Centro Nacional de Biotecnología (CNB-CSIC); Madrid 28049 Spain
| | - Ilaria Benedetti
- Systems and Synthetic Biology Program; Centro Nacional de Biotecnología (CNB-CSIC); Madrid 28049 Spain
| | - Víctor de Lorenzo
- Systems and Synthetic Biology Program; Centro Nacional de Biotecnología (CNB-CSIC); Madrid 28049 Spain
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26
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Integrated microbial processes for biofuels and high value-added products: the way to improve the cost effectiveness of biofuel production. Appl Microbiol Biotechnol 2013; 98:1043-53. [DOI: 10.1007/s00253-013-5389-5] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 11/06/2013] [Accepted: 11/06/2013] [Indexed: 10/25/2022]
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27
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Havlik I, Reardon KF, Ünal M, Lindner P, Prediger A, Babitzky A, Beutel S, Scheper T. Monitoring of microalgal cultivations with on-line, flow-through microscopy. ALGAL RES 2013. [DOI: 10.1016/j.algal.2013.04.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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28
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On-line monitoring of large cultivations of microalgae and cyanobacteria. Trends Biotechnol 2013; 31:406-14. [PMID: 23707058 DOI: 10.1016/j.tibtech.2013.04.005] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2012] [Revised: 04/15/2013] [Accepted: 04/15/2013] [Indexed: 11/20/2022]
Abstract
Large cultivations of microalgae will benefit from on-line monitoring to achieve process control and improved productivity. This monitoring requires reliable sensors for on-line, in situ measurement of both physicochemical and biological process variables. Although standard industrial sensors can be used for many physicochemical variables, monitoring methods for most biological quantities rely on sensors that are currently suitable only for laboratory scale or off-line use. Here, we review these methods and discuss new approaches that could be adapted. We suggest that these new methods should be noninvasive and based on approaches that have already been applied to other bioprocesses; examples discussed here are in situ microscopy, flow cytometry (FC), IR spectroscopy, and software sensors.
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29
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Wagner H, Dunker S, Liu Z, Wilhelm C. Subcommunity FTIR-spectroscopy to determine physiological cell states. Curr Opin Biotechnol 2013; 24:88-94. [DOI: 10.1016/j.copbio.2012.09.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2012] [Revised: 09/11/2012] [Accepted: 09/12/2012] [Indexed: 11/28/2022]
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30
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Matos CT, Lopes da Silva T. Using multi-parameter flow cytometry as a novel approach for physiological characterization of bacteria in microbial fuel cells. Process Biochem 2013. [DOI: 10.1016/j.procbio.2012.11.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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31
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Neumeyer A, Hübschmann T, Müller S, Frunzke J. Monitoring of population dynamics of Corynebacterium glutamicum by multiparameter flow cytometry. Microb Biotechnol 2012; 6:157-67. [PMID: 23279937 PMCID: PMC3917458 DOI: 10.1111/1751-7915.12018] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Revised: 10/31/2012] [Accepted: 11/03/2012] [Indexed: 11/29/2022] Open
Abstract
Phenotypic variation of microbial populations is a well-known phenomenon and may have significant impact on the success of industrial bioprocesses. Flow cytometry (FC) and the large repertoire of fluorescent dyes bring the high-throughput analysis of multiple parameters in single bacterial cells into reach. In this study, we evaluated a set of different fluorescent dyes for suitability in FC single cell analysis of the biotechnological platform organism Corynebacterium glutamicum. Already simple scattering properties of C. glutamicum cells in the flow cytometer were shown to provide valuable information on the growth activity of analysed cells. Furthermore, we used DAPI staining for a FC-based determination of the DNA content of C. glutamicum cells grown on standard minimal or complex media. Characteristic DNA patterns were observed mirroring the typical uncoupled DNA synthesis in the logarithmic (log) growth phase and are in agreement with a symmetric type of cell division of C. glutamicum. Application of the fluorescent dyes Syto 9, propidium iodide, and DiOC2(3) allowed the identification of subpopulations with reduced viability and membrane potential within early log and stationary phase populations. The presented data highlight the potential of FC-based analyses for online monitoring of C. glutamicum bioprocesses and provide a first reference for future applications and protocols.
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Affiliation(s)
- Andrea Neumeyer
- Institute of Bio- and Geosciences, IBG-1: Biotechnology, Forschungszentrum Jülich, Jülich, Germany
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32
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Freitas C, Neves E, Reis A, Passarinho PC, da Silva TL. Effect of Acetic Acid on Saccharomyces Carlsbergensis ATCC 6269 Batch Ethanol Production Monitored by Flow Cytometry. Appl Biochem Biotechnol 2012; 168:1501-15. [DOI: 10.1007/s12010-012-9873-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Accepted: 08/28/2012] [Indexed: 11/24/2022]
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