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Cui Y, Wang K, Zhou X, Meng C, Gao Z. Lipid accumulation mechanism of Amphora coffeaeformis under nitrogen deprivation and its application as a feed additive in Carassius auratus aquaculture. BIOTECHNOLOGY FOR BIOFUELS AND BIOPRODUCTS 2023; 16:189. [PMID: 38057940 DOI: 10.1186/s13068-023-02436-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Accepted: 11/21/2023] [Indexed: 12/08/2023]
Abstract
BACKGROUND Amphora coffeaeformis, a unicellular diatom, can significantly accumulate lipids under nitrogen (N) limitation. However, the molecular mechanism underlying lipid accumulation in A. coffeaeformis remains unknown and its application development is lagging. RESULTS This work analyzed the lipid composition of A. coffeaeformis under N deprivation and investigated its mechanism underlying lipid accumulation using RNA-seq. The results showed that the total lipid content of A. coffeaeformis increased from 28.22 to 44.05% after 5 days of N deprivation, while the neutral lipid triacylglycerol (TAG) content increased from 10.41 to 25.21%. The transcriptional profile showed that N deprivation induced wide-ranging reprogramming of regulation and that most physiological activities were repressed, while the upregulation of glycerol-3-phosphate acyltransferase directly determined TAG accumulation. Moreover, we explored the effect of A. coffeaeformis as a food additive on the lipid composition of crucian carp. The results showed that the contents of unsaturated fatty acids in the meat of fish supplemented with A. coffeaeformis were significantly increased, indicating its potential application in animal nutrition for improving meat quality indicators. CONCLUSION The findings shed light on the molecular mechanisms of neutral lipid accumulation and revealed the key genes involved in lipid metabolism in A. coffeaeformis. Moreover, we also confirmed that A. coffeaeformis can be used as feed additive for improving the lipid composition of crucian carp meat, which provided evidence for the biotechnology application of this high-oil microalgae.
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Affiliation(s)
- Yulin Cui
- Binzhou Medical University, No. 346, Guanhai Road, Laishan District, Yantai, 256603, Shandong Province, China
| | - Kang Wang
- Key Laboratory of Coastal Biology and Biological Resource Utilization, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, Shandong, China
- University of Chinese Academy of Sciences, Beijing, Beijing, 101418, China
| | - Xiuzhi Zhou
- Binzhou Medical University, No. 346, Guanhai Road, Laishan District, Yantai, 256603, Shandong Province, China
| | - Chunxiao Meng
- Binzhou Medical University, No. 346, Guanhai Road, Laishan District, Yantai, 256603, Shandong Province, China
| | - Zhengquan Gao
- Binzhou Medical University, No. 346, Guanhai Road, Laishan District, Yantai, 256603, Shandong Province, China.
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Zhu L, Gao H, Li L, Zhang Y, Zhao Y, Yu X. Promoting lutein production from the novel alga Acutodesmus sp. by melatonin induction. BIORESOURCE TECHNOLOGY 2022; 362:127818. [PMID: 36041678 DOI: 10.1016/j.biortech.2022.127818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 08/16/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
In the current research, a novel microalgae strain was isolated from Yajiageng Red Rock Beach and identified as Acutodesmus sp. HLGY. To obtain high-efficiency production of lutein from algae, the feasibility of using melatonin (MT) to increase lutein yield of Acutodesmus sp. HLGY was evaluated. Under the 7.5 μM MT treatment, the lutein content and lutein productivity were 17.44 mg g-1 and 46.50 mg L-1 d-1, which were 1.53 times those of the control. Furthermore, exogenous MT increased the transcripts of key lutein synthesis- and antioxidant enzyme-related genes. Simultaneously, the carbohydrate, protein, and cellular reactive oxygen species (ROS) levels and lipid content were suppressed. More importantly, the ethylene and γ-aminobutyric acid contents were markedly increased by MT, which may be linked to the increase in lutein biosynthesis. This study proposes a valuable biotechnological approach for lutein production via a novel Acutodesmus sp. strain using MT induction and provides insights into the role of MT in promoting lutein biosynthesis.
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Affiliation(s)
- Liyan Zhu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Hui Gao
- Yunnan Alphy Biotech Co., Ltd, Chuxiong 675000, China
| | - Linpin Li
- Yunnan Alphy Biotech Co., Ltd, Chuxiong 675000, China
| | - Yong Zhang
- Yunnan Alphy Biotech Co., Ltd, Chuxiong 675000, China
| | - Yongteng Zhao
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China
| | - Xuya Yu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, China.
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Digestate as Sustainable Nutrient Source for Microalgae—Challenges and Prospects. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11031056] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The interest in microalgae products has been increasing, and therefore the cultivation industry is growing steadily. To reduce the environmental impact and production costs arising from nutrients, research needs to find alternatives to the currently used artificial nutrients. Microalgae cultivation in anaerobic effluents (more specifically, digestate) represents a promising strategy for increasing sustainability and obtaining valuable products. However, digestate must be processed prior to its use as nutrient source. Depending on its composition, different methods are suitable for removing solids (e.g., centrifugation) and adjusting nutrient concentrations and ratios (e.g., dilution, ammonia stripping). Moreover, the resulting cultivation medium must be light-permeable. Various studies show that growth rates comparable to those in artificial media can be achieved when proper digestate treatment is used. The necessary steps for obtaining a suitable cultivation medium also depend on the microalgae species to be cultivated. Concerning the application of the biomass, legal aspects and impurities originating from digestate must be considered. Furthermore, microalgae species and their application fields are essential criteria when selecting downstream processing methods (harvest, disintegration, dehydration, product purification). Microalgae grown on digestate can be used to produce various products (e.g., bioenergy, animal feed, bioplastics, and biofertilizers). This review gives insight into the origin and composition of digestate, processing options to meet requirements for microalgae cultivation and challenges regarding downstream processing and products.
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Gruber-Brunhumer MR, Montgomery LFR, Nussbaumer M, Schoepp T, Zohar E, Muccio M, Ludwig I, Bochmann G, Fuchs W, Drosg B. Effects of partial maize silage substitution with microalgae on viscosity and biogas yields in continuous AD trials. J Biotechnol 2019; 295:80-89. [PMID: 30853635 DOI: 10.1016/j.jbiotec.2019.02.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 02/20/2019] [Indexed: 11/29/2022]
Abstract
The microalga Acutodesmus obliquus was investigated as a feedstock in semi-continuously fed anaerobic digestion trials, where A. obliquus was co-digested with pig slurry and maize silage. Maize silage was substituted by both 10% and 20% untreated, and 20% ultrasonicated microalgae biomass on a VS (volatile solids) basis. The substitution of maize silage with 20% of either ultrasonicated and untreated microalgae led to significantly lower biogas yields, i.e., 560 dm³ kg-1 VScorr in the reference compared to 516 and 509 dm³ kg-1VScorr for untreated and ultrasonicated microalgae substitution. Further, the viscosities in the different reactors were measured at an OLR of 3.5 g VS dm-3 d-1. However, all treatments with microalgae resulted in significantly lower viscosities. While the mean viscosity reached 0.503 Pa s in the reference reactor, mean viscosities were 53% lower in reactors where maize was substituted by 20% microalgae, i.e. 0.239 Pa s, at a constant rotation speed of 30 rpm. Reactors where maize was substituted by 20% ultrasonicated microalgae had a 32% lower viscosity, for 10% microalgae substitution a decrease of 8% was measured. Decreased viscosities have beneficial effect on the bioprocess and the economy in biogas plants. Nonetheless, with regard to other parameters, no positive effect on biogas yields by partial substitution with microalgae biomass was found. The application of microalgae may be an interesting option in anaerobic digestion when fibrous or lignocellulosic substances lead to high viscosities of the digested slurries. High production costs remain the bottleneck for making microalgae an interesting feedstock.
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Affiliation(s)
- M R Gruber-Brunhumer
- BIOENERGY 2020+ GmbH, Inffeldgasse 21b, A-8010 Graz, Austria; University of Natural Resources and Life Sciences, Department for Agrobiotechnology, Institute of Environmental Biotechnology, Konrad Lorenz Str. 20, A-3430 Tulln, Austria; Institute for Environment and Food Security, Montfortstraße 4, 6900 Bregenz, Austria
| | - L F R Montgomery
- BIOENERGY 2020+ GmbH, Inffeldgasse 21b, A-8010 Graz, Austria; University of Natural Resources and Life Sciences, Department for Agrobiotechnology, Institute of Environmental Biotechnology, Konrad Lorenz Str. 20, A-3430 Tulln, Austria; NNFCC Ltd, Biocentre, York Science Park, Innovation Way, York, YO10 5DG, United Kingdom
| | - M Nussbaumer
- BIOENERGY 2020+ GmbH, Inffeldgasse 21b, A-8010 Graz, Austria; University of Natural Resources and Life Sciences, Department for Agrobiotechnology, Institute of Environmental Biotechnology, Konrad Lorenz Str. 20, A-3430 Tulln, Austria
| | - T Schoepp
- BIOENERGY 2020+ GmbH, Inffeldgasse 21b, A-8010 Graz, Austria; University of Natural Resources and Life Sciences, Institute of Sanitary Engineering and Water Pollution Control (SIG), Muthgasse 18, 1190 Wien, Austria
| | - E Zohar
- Erber Future Business, Erber Campus 1, 3131 Getzersdorf, Austria; ROHKRAFT green, Schulgasse 6, A3454 Reidling, Austria
| | - M Muccio
- Erber Future Business, Erber Campus 1, 3131 Getzersdorf, Austria; BIOMIN Holding GmbH, Erber Campus 1, 3131 Getzersdorf, Austria
| | - I Ludwig
- University of Natural Resources and Life Sciences, Department for Agrobiotechnology, Institute of Environmental Biotechnology, Konrad Lorenz Str. 20, A-3430 Tulln, Austria
| | - G Bochmann
- BIOENERGY 2020+ GmbH, Inffeldgasse 21b, A-8010 Graz, Austria
| | - W Fuchs
- BIOENERGY 2020+ GmbH, Inffeldgasse 21b, A-8010 Graz, Austria; University of Natural Resources and Life Sciences, Department for Agrobiotechnology, Institute of Environmental Biotechnology, Konrad Lorenz Str. 20, A-3430 Tulln, Austria
| | - B Drosg
- BIOENERGY 2020+ GmbH, Inffeldgasse 21b, A-8010 Graz, Austria; University of Natural Resources and Life Sciences, Department for Agrobiotechnology, Institute of Environmental Biotechnology, Konrad Lorenz Str. 20, A-3430 Tulln, Austria
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Patidar SK, Kim SH, Kim JH, Park J, Park BS, Han MS. Pelagibaca bermudensis promotes biofuel competence of Tetraselmis striata in a broad range of abiotic stressors: dynamics of quorum-sensing precursors and strategic improvement in lipid productivity. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:102. [PMID: 29636820 PMCID: PMC5889607 DOI: 10.1186/s13068-018-1097-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 03/26/2018] [Indexed: 05/28/2023]
Abstract
BACKGROUND Amelioration of biofuel feedstock of microalgae using sustainable means through synthetic ecology is a promising strategy. The co-cultivation model (Tetraselmis striata and Pelagibaca bermudensis) was evaluated for the robust biofuel production under varying stressors as well as with the selected two-stage cultivation modes. In addition, the role of metabolic exudates including the quorum-sensing precursors was assessed. RESULTS The co-cultivation model innovated in this study supported the biomass production of T. striata in a saline/marine medium at a broad range of pH, salinity, and temperature/light conditions, as well as nutrient limitation with a growth promotion of 1.2-3.6-fold. Hence, this developed model could contribute to abiotic stress mitigation of T. striata. The quorum-sensing precursor dynamics of the growth promoting bacteria P. bermudensis exhibited unique pattern under varying stressors as revealed through targeted metabolomics (using liquid chromatography-mass spectrometry, LC-MS). P. bermudensis and its metabolic exudates mutually promoted the growth of T. striata, which elevated the lipid productivity. Interestingly, hydroxy alkyl quinolones independently showed growth inhibition of T. striata on elevated concentration. Among two-stage cultivation modes (low pH, elevated salinity, and nitrate limitation), specifically, nitrate limitation induced a 1.5 times higher lipid content (30-31%) than control in both axenic and co-cultivated conditions. CONCLUSION Pelagibaca bermudensis is established as a potential growth promoting native phycospheric bacteria for robust biomass generation of T. striata in varying environment, and two-stage cultivation using nitrate limitation strategically maximized the biofuel precursors for both axenic and co-cultivation conditions (T and T-PB, respectively). Optimum metabolic exudate of P. bermudensis which act as a growth substrate to T. striata surpasses the antagonistic effect of excessive hydroxy alkyl quinolones [HHQ, 4-hydroxy-2-alkylquinolines and PQS (pseudomonas quorum signal), 2-heptyl-3-hydroxy-4(1H)-quinolone].
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Affiliation(s)
- Shailesh Kumar Patidar
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, South Korea
- Research Institute of Natural Sciences, Hanyang University, Seoul, South Korea
| | - Sae-Hee Kim
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, South Korea
- Research Institute of Natural Sciences, Hanyang University, Seoul, South Korea
| | - Jin Ho Kim
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, South Korea
- Research Institute of Natural Sciences, Hanyang University, Seoul, South Korea
| | - Jungsoo Park
- Research Institute of Natural Sciences, Hanyang University, Seoul, South Korea
| | - Bum Soo Park
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, South Korea
- Research Institute of Natural Sciences, Hanyang University, Seoul, South Korea
- Present Address: Marine Science Institute, University of Texas at Austin, Port Aransas, TX USA
| | - Myung-Soo Han
- Department of Life Science, College of Natural Sciences, Hanyang University, Seoul, South Korea
- Research Institute of Natural Sciences, Hanyang University, Seoul, South Korea
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Cyanobacteria Biorefinery — Production of poly(3-hydroxybutyrate) with Synechocystis salina and utilisation of residual biomass. J Biotechnol 2018; 265:46-53. [DOI: 10.1016/j.jbiotec.2017.10.020] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 10/14/2017] [Accepted: 10/30/2017] [Indexed: 12/23/2022]
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Aléman-Nava GS, Muylaert K, Cuellar Bermudez SP, Depraetere O, Rittmann B, Parra-Saldívar R, Vandamme D. Two-stage cultivation of Nannochloropsis oculata for lipid production using reversible alkaline flocculation. BIORESOURCE TECHNOLOGY 2017; 226:18-23. [PMID: 27988475 DOI: 10.1016/j.biortech.2016.11.121] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 11/29/2016] [Accepted: 11/30/2016] [Indexed: 06/06/2023]
Abstract
Two-stage cultivation for microalgae biomass is a promising strategy to boost lipid accumulation and productivity. Most of the currently described processes use energy-intensive centrifugation for cell separation after the first cultivation stage. This laboratory study evaluated alkaline flocculation as low-cost alternative separation method to harvest Nannochloropsis oculata prior to cultivation in the second nutrient-depleted cultivation stage. Biomass concentration over time and the maximum quantum yield of photosystem II expressed as Fv:Fm ratio showed identical patterns for both harvesting methods in both stages. The composition of total lipids, carbohydrates, and protein was similar for biomass harvested via alkaline flocculation or centrifugation. Likewise, both harvest methods yielded the same increase in total lipid content, to 40% within the first 2days of the nutrient-depleted stage, with an enrichment in C16 fatty acid methyl esters. Centrifugation can therefore be replaced with alkaline flocculation to harvest Nannochloropsis oculata after the first cultivation stage.
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Affiliation(s)
- Gibran Sidney Aléman-Nava
- Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey, N.L. 64849, Mexico
| | - Koenraad Muylaert
- KU Leuven Campus Kulak, Laboratory for Aquatic Biology, E. Sabbelaan 53, 8500 Kortrijk, Belgium
| | | | - Orily Depraetere
- KU Leuven Campus Kulak, Laboratory for Aquatic Biology, E. Sabbelaan 53, 8500 Kortrijk, Belgium
| | - Bruce Rittmann
- Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey, N.L. 64849, Mexico; Biodesign Swette Center for Environmental Biotechnology, Arizona State University, PO Box 875701, Tempe, AZ 85287-5701, USA
| | - Roberto Parra-Saldívar
- Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey, N.L. 64849, Mexico
| | - Dries Vandamme
- KU Leuven Campus Kulak, Laboratory for Aquatic Biology, E. Sabbelaan 53, 8500 Kortrijk, Belgium.
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