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Pigments Production, Growth Kinetics, and Bioenergetic Patterns in Dunaliella tertiolecta (Chlorophyta) in Response to Different Culture Media. ENERGIES 2020. [DOI: 10.3390/en13205347] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
This work dealt with the study of growth parameters, pigments production, and bioenergetic aspects of the microalga Dunaliella tertiolecta in different culture media. For this purpose, cultures were carried out in Erlenmeyer flasks containing F/2 medium, Bold’s Basal medium, or an alternative medium made up of the same constituents of the Bold’s Basal medium dissolved in natural seawater instead of distilled water. D. tertiolecta reached the highest dry cell concentration (Xmax = 1223 mgDM·L−1), specific growth rate (µmax = 0.535 d−1), cell productivity (PX = 102 mgDM·L−1·d−1), and photosynthetic efficiency (PE = 14.54%) in the alternative medium, while the highest contents of carotenoids (52.0 mg·g−1) and chlorophyll (108.0 mg·g−1) in the biomass were obtained in Bold’s Basal medium. As for the bioenergetic parameters, the biomass yield on Gibbs energy dissipation was higher and comparable in both seawater-based media. However, the F/2 medium led to the highest values of moles of photons absorbed to produce 1 C-mol of biomass (nPh), total Gibbs energy absorbed by the photosynthesis (ΔGa) and released heat (Q), as well as the lowest cell concentration, thus proving to be the least suitable medium for D. tertiolecta growth. On the other hand, the highest values of molar development of O2 and consumption of H+ and H2O were obtained in the alternative medium, which also ensured the best kinetic parameters, thereby allowing for the best energy exploitation for cell growth. These results demonstrate that composition of culture medium for microalgae cultivation has different effects on pigments production, growth kinetics, and bioenergetics parameters, which should be taken into consideration for any use of biomass, including as raw material for biofuels production.
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Singh P, Khadim R, Singh AK, Singh U, Maurya P, Tiwari A, Asthana RK. Biochemical and physiological characterization of a halotolerant Dunaliella salina isolated from hypersaline Sambhar Lake, India. JOURNAL OF PHYCOLOGY 2019; 55:60-73. [PMID: 30118147 DOI: 10.1111/jpy.12777] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 07/29/2018] [Indexed: 06/08/2023]
Abstract
The objective of the present study was to characterize intrinsic physiological and biochemical properties of the wall-less unicellular cholorophyte Dunaliella salina isolated from a hypersaline Sambhar Lake. The strain grew optimally at 0.5 M NaCl and 16:8 h L:D photoperiod along with maintaining low level of intracellular Na+ even at higher salinity, emphasizing special features of its cell membranes. It was observed that the cells experienced stress beyond 2 M NaCl as evidenced by increased intracellular reactive oxygen species and antioxidative enzymes, nevertheless proline and malondialdehyde content declined sharply accompanied by higher neutral lipid accumulation. Salinity exceeding 2 M resulted decrease in photosynthetic quantum yield (Fv/Fm) and enhanced glycerol synthesis accompanied by leakage. Super oxide dismutase seemed to play a pivotal role in antioxidative defense as eight isoforms were expressed differentially while catalase and glutathione peroxidase showing no significant change in their expression at higher salinity. The ability of D. salina to grow in range of salinities by sustaining healthy photosynthetic apparatus along with accumulation of valuable products made this alga an ideal organism that can be exploited as resource for biofuel and commercial products.
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Affiliation(s)
- Prabhakar Singh
- R. N. Singh Memorial Lab, Centre of Advanced study in Botany, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India
| | - Riyazat Khadim
- R. N. Singh Memorial Lab, Centre of Advanced study in Botany, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India
| | - Ankit K Singh
- R. N. Singh Memorial Lab, Centre of Advanced study in Botany, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India
| | - Urmilesh Singh
- R. N. Singh Memorial Lab, Centre of Advanced study in Botany, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India
| | - Priyanka Maurya
- R. N. Singh Memorial Lab, Centre of Advanced study in Botany, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India
| | - Anupam Tiwari
- Department of Botany, School of Bioengineering and Biosciences, Lovely Professional University, Phagwara, Punjab, 144411, India
| | - Ravi K Asthana
- R. N. Singh Memorial Lab, Centre of Advanced study in Botany, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India
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Paidimuddala B, Krishna Aradhyam G, N. Gummadi S. A halotolerant aldose reductase from Debaryomyces nepalensis: gene isolation, overexpression and biochemical characterization. RSC Adv 2017. [DOI: 10.1039/c7ra01697b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aldose reductase (AR) catalyzes the conversion of aldoses to polyols, the natural sugar substitutes. Here we provide gene sequence and characteristics of the first-ever halotolerant AR which could be exploited as a potential biocatalyst.
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Affiliation(s)
- Bhaskar Paidimuddala
- Applied and Industrial Microbiology Laboratory
- Department of Biotechnology
- Bhupat and Jyoti Mehta School of Biosciences
- Indian Institute of Technology Madras
- Chennai 600 036
| | - Gopala Krishna Aradhyam
- Applied and Industrial Microbiology Laboratory
- Department of Biotechnology
- Bhupat and Jyoti Mehta School of Biosciences
- Indian Institute of Technology Madras
- Chennai 600 036
| | - Sathyanarayana N. Gummadi
- Applied and Industrial Microbiology Laboratory
- Department of Biotechnology
- Bhupat and Jyoti Mehta School of Biosciences
- Indian Institute of Technology Madras
- Chennai 600 036
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Liu L, Pohnert G, Wei D. Extracellular Metabolites from Industrial Microalgae and Their Biotechnological Potential. Mar Drugs 2016; 14:E191. [PMID: 27775594 PMCID: PMC5082339 DOI: 10.3390/md14100191] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 09/23/2016] [Accepted: 10/09/2016] [Indexed: 01/07/2023] Open
Abstract
Industrial microalgae, as a big family of promising producers of renewable biomass feedstock, have been commercially exploited for functional food, living feed and feed additives, high-value chemicals in nutraceuticals, cosmeceuticals, and chemical reagents. Recently, microalgae have also been considered as a group that might play an important role in biofuel development and environmental protection. Almost all current products of industrial microalgae are derived from their biomass; however, large amounts of spent cell-free media are available from mass cultivation that is mostly unexploited. In this contribution we discuss that these media, which may contain a remarkable diversity of bioactive substances are worthy to be recovered for further use. Obviously, the extracellular metabolites from industrial microalgae have long been neglected in the development of production methods for valuable metabolites. With the advances in the last ten years, more and more structures and properties from extracellular metabolites have been identified, and the potential utilization over wide fields is attracting attention. Some of these extracellular metabolites can be potentially used as drugs, antioxidants, growth regulators or metal chelators. The purpose of this review is to provide an overview of the known extracellular metabolites from industrial microalgae which might be of commercial interest. The attention mainly focuses on the reports of extracellular bioactive metabolites and their potential application in biotechnology.
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Affiliation(s)
- Lu Liu
- School of Food Science and Engineering, South China University of Technology, Wushan Rd. 381, Guangzhou 510641, China.
| | - Georg Pohnert
- Institute for Inorganic and Analytical Chemistry, Bioorganic Analytics, Friedrich Schiller University Jena, Lessingstr. 8, Jena D-07743, Germany.
| | - Dong Wei
- School of Food Science and Engineering, South China University of Technology, Wushan Rd. 381, Guangzhou 510641, China.
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