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Burgstaller L, Löffler S, De Marcellis L, Ghassemi K, Neureiter M. The influence of different carbon sources on growth and single cell oil production in oleaginous yeasts Apiotrichum brassicae and Pichia kudriavzevii. N Biotechnol 2022; 69:1-7. [PMID: 35182781 DOI: 10.1016/j.nbt.2022.02.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 02/09/2022] [Accepted: 02/12/2022] [Indexed: 12/17/2022]
Abstract
Oleaginous yeasts offer an interesting possibility for renewable lipid production, since the single cell oil accumulated can be based on a wide range of cheap, waste-derived carbon sources. Here, several short chain carboxylic acids and sugars commonly found in these substrates were assessed as carbon sources for Apiotrichum brassicae and Pichia kudriavzevii. While both strains were able to utilize all carbon sources employed, high volumetric lipid productivities (0.4g/Lh) and lipid contents (68%) could be reached particularly with acetic acid as carbon source. Odd-numbered volatile fatty acids led to lower productivities and lipid contents, but the lipids contained unusually high proportions of odd-numbered fatty acids (up to 80% of total fatty acids). These fatty acids are rather uncommon in nature and might offer the possibility for various high value applications. In conclusion both strains are able to utilize a wide range of substrates potentially present in waste-derived substrates. Lipid content and volumetric lipid productivity strongly depend on the carbon source, with even-numbered volatile fatty acids resulting in the highest values. For volatile fatty acids in particular, the carbon source also strongly influences the composition of the lipids produced by the yeast strains.
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Affiliation(s)
- Lukas Burgstaller
- Department for Agrobiotechnology (IFA-Tulln), Institute for Environmental Biotechnology, University of Natural Resources and Life Sciences, Vienna (BOKU), Vienna, Austria
| | - Sebastian Löffler
- Department for Agrobiotechnology (IFA-Tulln), Institute for Environmental Biotechnology, University of Natural Resources and Life Sciences, Vienna (BOKU), Vienna, Austria
| | - Luca De Marcellis
- Department for Agrobiotechnology (IFA-Tulln), Institute for Environmental Biotechnology, University of Natural Resources and Life Sciences, Vienna (BOKU), Vienna, Austria
| | - Khatereh Ghassemi
- Department for Agrobiotechnology (IFA-Tulln), Institute for Environmental Biotechnology, University of Natural Resources and Life Sciences, Vienna (BOKU), Vienna, Austria
| | - Markus Neureiter
- Department for Agrobiotechnology (IFA-Tulln), Institute for Environmental Biotechnology, University of Natural Resources and Life Sciences, Vienna (BOKU), Vienna, Austria.
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Arora N, Patel A, Mehtani J, Pruthi PA, Pruthi V, Poluri KM. Co-culturing of oleaginous microalgae and yeast: paradigm shift towards enhanced lipid productivity. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:16952-16973. [PMID: 31030399 DOI: 10.1007/s11356-019-05138-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 04/08/2019] [Indexed: 06/09/2023]
Abstract
Oleaginous microalgae and yeast are the two major propitious factories which are sustainable sources for biodiesel production, as they can accumulate high quantities of lipids inside their bodies. To date, various microalgal and yeast species have been exploited singly for biodiesel production. However, despite the ongoing efforts, their low lipid productivity and the high cost of cultivation are still the major bottlenecks hindering their large-scale deployment. Co-culturing of microalgae and yeast has the potential to increase the overall lipid productivity by minimizing its production cost as both these organisms can utilize each other's by-products. Microalgae act as an O2 generator for yeast while consuming the CO2 and organic acids released by the yeast cells. Further, yeast can break complex sugars in the medium, which can then be utilized by microalgae thereby opening new options for copious and low-cost feedstocks such as agricultural residues. The current review provides a historical and technical overview of the existing studies on co-culturing of yeast and microalgae and elucidates the crucial factors that affect the symbiotic relationship between these two organisms. Furthermore, the review also highlighted the advantages and the future perspectives for paving a path towards a sustainable biodiesel product.
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Affiliation(s)
- Neha Arora
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
| | - Alok Patel
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
| | - Juhi Mehtani
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
| | - Parul A Pruthi
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India
| | - Vikas Pruthi
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India.
- Centre for Transportation Systems (CTRANS), Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India.
| | - Krishna Mohan Poluri
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India.
- Centre for Transportation Systems (CTRANS), Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India.
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Samavi M, Uprety BK, Rakshit S. Bioconversion of Poplar Wood Hemicellulose Prehydrolysate to Microbial Oil Using Cryptococcus curvatus. Appl Biochem Biotechnol 2019; 189:626-637. [DOI: 10.1007/s12010-019-03032-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 04/22/2019] [Indexed: 02/07/2023]
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Yu D, Wang X, Fan X, Ren H, Hu S, Wang L, Shi Y, Liu N, Qiao N. Refined soybean oil wastewater treatment and its utilization for lipid production by the oleaginous yeast Trichosporon fermentans. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:299. [PMID: 30410574 PMCID: PMC6211406 DOI: 10.1186/s13068-018-1306-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Accepted: 10/27/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND The release of refined soybean oil wastewater (RSOW) with a high chemical oxygen demand (COD) and oil content burdens the environment. The conversion of RSOW into lipids by oleaginous yeasts may be a good way to turn this waste into usable products. RESULTS The oleaginous yeast Trichosporon fermentans was used for treating the RSOW without sterilization, dilution, or nutrient supplementation. It was found that the COD and oil content of the RSOW were removed effectively; microbial oil was abundantly produced in 48 h; and the phospholipids in the RSOW tended to contribute to a higher biomass and microbial lipid content. With Plackett-Burman design and response surface design experiments, the optimal wastewater treatment conditions were determined: temperature 28.3 °C, amount of inoculum 5.9% (v/v), and initial pH 6.1. The optimized conditions were used in a 5-L bioreactor to treat the RSOW. The maximum COD degradation of 94.7% was obtained within 40 h, and the removal of the oil content was 89.9%. The biomass was 7.9 g/L, the lipid concentration was 3.4 g/L, and the lipid content was 43% (w/w). The microbial oil obtained, with a main component of unsaturated fatty acids, was similar to vegetable oils and was suggested as a potential raw material for biodiesel production. CONCLUSION Trichosporon fermentans can be effectively used for RSOW treatment, and lipid production and can complete pretreatment and biochemical treatment simultaneously, allowing the utilization of RSOW, which both solves an environmental problem and positively impacts the use of resources. These results provide valuable information for developing and designing more efficient waste-into-lipid bioprocesses.
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Affiliation(s)
- Dayu Yu
- Sci-Tech Center for Clean Conversion and High-valued Utilization of Biomass, Jilin Province, Northeast Electric Power University, Jilin, 132012 China
- School of Chemical Engineering, Northeast Electric Power University, Jilin, 132012 China
| | - Xiaoning Wang
- Sci-Tech Center for Clean Conversion and High-valued Utilization of Biomass, Jilin Province, Northeast Electric Power University, Jilin, 132012 China
- School of Chemical Engineering, Northeast Electric Power University, Jilin, 132012 China
| | - Xue Fan
- Sci-Tech Center for Clean Conversion and High-valued Utilization of Biomass, Jilin Province, Northeast Electric Power University, Jilin, 132012 China
- School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin, 132012 China
| | - Huimin Ren
- Sci-Tech Center for Clean Conversion and High-valued Utilization of Biomass, Jilin Province, Northeast Electric Power University, Jilin, 132012 China
- School of Chemical Engineering, Northeast Electric Power University, Jilin, 132012 China
| | - Shuang Hu
- Sci-Tech Center for Clean Conversion and High-valued Utilization of Biomass, Jilin Province, Northeast Electric Power University, Jilin, 132012 China
- School of Chemical Engineering, Northeast Electric Power University, Jilin, 132012 China
| | - Lei Wang
- Sci-Tech Center for Clean Conversion and High-valued Utilization of Biomass, Jilin Province, Northeast Electric Power University, Jilin, 132012 China
- School of Chemical Engineering, Northeast Electric Power University, Jilin, 132012 China
| | - Yunfen Shi
- Sci-Tech Center for Clean Conversion and High-valued Utilization of Biomass, Jilin Province, Northeast Electric Power University, Jilin, 132012 China
- School of Chemical Engineering, Northeast Electric Power University, Jilin, 132012 China
| | - Na Liu
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021 China
| | - Nan Qiao
- Sci-Tech Center for Clean Conversion and High-valued Utilization of Biomass, Jilin Province, Northeast Electric Power University, Jilin, 132012 China
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021 China
- School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin, 132012 China
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Cho HU, Park JM. Biodiesel production by various oleaginous microorganisms from organic wastes. BIORESOURCE TECHNOLOGY 2018; 256:502-508. [PMID: 29478783 DOI: 10.1016/j.biortech.2018.02.010] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Revised: 02/01/2018] [Accepted: 02/02/2018] [Indexed: 05/23/2023]
Abstract
Biodiesel is a biodegradable and renewable fuel. A large amount of research has considered microbial oil production using oleaginous microorganisms, but the commercialization of microbial lipids produced in this way remains uncertain due to the high cost of feedstock or low lipid yield. Microbial lipids can be typically produced by microalgae, yeasts, and bacteria; the lipid yields of these microorganisms can be improved by using sufficient concentrations of organic carbon sources. Therefore, combining low-cost organic compounds contained in organic wastes with cultivation of oleaginous microorganisms can be a promising approach to obtain commercial viability. However, to achieve effective bioconversion of low-cost substrates to microbial lipids, the characteristics of each microorganism and each substrate should be considered simultaneously. This article discusses recent approaches to developing cost-effective microbial lipid production processes that use various oleaginous microorganisms and organic wastes.
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Affiliation(s)
- Hyun Uk Cho
- School of Environmental Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk 37673, Republic of Korea; Bioenergy Research Center, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Jong Moon Park
- School of Environmental Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk 37673, Republic of Korea; Bioenergy Research Center, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk 37673, Republic of Korea; Department of Chemical Engineering, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk 37673, Republic of Korea; Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang, Gyeongbuk 37673, Republic of Korea.
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Liu L, Chen J, Lim PE, Wei D. Enhanced single cell oil production by mixed culture of Chlorella pyrenoidosa and Rhodotorula glutinis using cassava bagasse hydrolysate as carbon source. BIORESOURCE TECHNOLOGY 2018; 255:140-148. [PMID: 29414159 DOI: 10.1016/j.biortech.2018.01.114] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 01/18/2018] [Accepted: 01/22/2018] [Indexed: 06/08/2023]
Abstract
The single cell oil (SCO) production by the mono and mixed culture of microalgae Chlorella pyrenoidosa and red yeast Rhodotorula glutinis was investigated using non-detoxified cassava bagasse hydrolysate (CBH) as carbon source. The results suggested that the two strains were able to tolerate and even degrade some byproducts presented in the CBH, and the mixed culture approach enhanced the degradation of certain byproducts. Biomass (20.37 ± 0.38 g/L) and lipid yield (10.42 ± 1.21 g/L) of the mixed culture achieved in the batch culture were significantly higher than that of the mono-cultures (p < 0.05). The fed-batch culture further raised the biomass and lipid yield to 31.45 ± 4.93 g/L and 18.47 ± 3.25 g/L, respectively. The lipids mainly composed of oleic acid and palmitic acid, suggesting the potential applications such as biofuel feedstock, cosmetics, food additives and lubricant. This study provided new insights for the integration of the economical SCO production with agro-industrial waste disposal.
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Affiliation(s)
- Lu Liu
- School of Food Sciences and Engineering, South China University of Technology, Wushan Rd. 381, Guangzhou 510641, PR China
| | - Junhui Chen
- School of Food Sciences and Engineering, South China University of Technology, Wushan Rd. 381, Guangzhou 510641, PR China
| | - Phaik-Eem Lim
- Institute of Ocean and Earth Sciences (IOES), University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Dong Wei
- School of Food Sciences and Engineering, South China University of Technology, Wushan Rd. 381, Guangzhou 510641, PR China; Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou, China.
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Shen Q, Chen Y, Lin H, Wang Q, Zhao Y. Agro-industrial waste recycling by Trichosporon fermentans: conversion of waste sweetpotato vines alone into lipid. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:8793-8799. [PMID: 29327194 DOI: 10.1007/s11356-018-1231-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 01/04/2018] [Indexed: 06/07/2023]
Abstract
Agro-industrial waste can be used to replace traditional carbohydrates, such as sucrose, starch, and glucose in many industrial fermentation processes. This study investigated the conversion of pre-treated waste sweetpotato vines (SV) into lipid by Trichosporon fermentans under the separate hydrolysis and fermentation (SHF) and the simultaneous saccharification and fermentation (SSF) processes. The results showed that SV autoclaving significantly increased the lipid accumulation of T. fermentans compared with acid or alkaline hydrolysis. The effects of different pre-treatments on SV were also studied by scanning electron microscopy and Fourier transform infrared spectroscopy, which showed the partial removal of the aliphatic fractions, hemicelluloses, and lignin during pre-treatment. Moreover, the lipid yield of T. fermentans in SSF was 6.98 g L-1, which was threefold higher than that (2.79 g L-1) in SHF, and the lipid contents of yeast in SSF and SHF were 36 and 25%, respectively. Overall, this study indicated that SSF using autoclaved SV could increase the growth and lipid production of T. fermentans and provided an efficient way to realize the resource utilization of waste SV.
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Affiliation(s)
- Qi Shen
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China
- Institute of Plant Protection and Microbiology, Zhejiang Academy of Agriculture Science, Hangzhou, Zhejiang, People's Republic of China
| | - Yue Chen
- Institute of Horticulture, Zhejiang Academy of Agriculture Science, Hangzhou, Zhejiang, People's Republic of China
| | - Hui Lin
- Institute of Environment Resource and Soil Fertilizer, Zhejiang Academy of Agriculture Science, Hangzhou, Zhejiang, People's Republic of China
| | - Qun Wang
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China
| | - Yuhua Zhao
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China.
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Qin L, Liu L, Zeng AP, Wei D. From low-cost substrates to Single Cell Oils synthesized by oleaginous yeasts. BIORESOURCE TECHNOLOGY 2017; 245:1507-1519. [PMID: 28642053 DOI: 10.1016/j.biortech.2017.05.163] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 05/24/2017] [Accepted: 05/26/2017] [Indexed: 05/23/2023]
Abstract
As new feedstock for biofuels, microbial oils have received worldwide attentions due to their environmentally-friendly characters. Microbial oil production based on low-cost raw materials is significantly attractive to the current biodiesel refinery industry. In terms of SCOs production, oleaginous yeast has numerous advantages over bacteria, molds and microalgae based on their high growth rate and lipid yield. Numerous efforts have been made on the competitive lipid production combining the use of cheap raw materials as substrates by yeasts. In this paper, we provided an overview of lipid metabolism in yeast cells. New advances using oleaginous yeast as a cell factory for high-value lipid production from various low-cost substrates are also reviewed, and the enhanced strategies based on synergistic effects of oleaginous yeast and microalgae in co-culture are discussed in details.
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Affiliation(s)
- Lei Qin
- School of Food Sciences and Engineering, South China University of Technology, Wushan Rd. 381, Guangzhou 510641, PR China; Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, PR China
| | - Lu Liu
- School of Food Sciences and Engineering, South China University of Technology, Wushan Rd. 381, Guangzhou 510641, PR China
| | - An-Ping Zeng
- Institute of Bioprocess and Biosystems Engineering, Hamburg University of Technology, Denickestr. 15, D-21073 Hamburg, Germany
| | - Dong Wei
- School of Food Sciences and Engineering, South China University of Technology, Wushan Rd. 381, Guangzhou 510641, PR China.
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Liu LY, Qin JC, Li K, Mehmood MA, Liu CG. Impact of moisture content on instant catapult steam explosion pretreatment of sweet potato vine. BIORESOUR BIOPROCESS 2017. [DOI: 10.1186/s40643-017-0179-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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10
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The utilization of sweet potato vines as carbon sources for fermenting bio-butanol. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.02.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Yu D, Shi Y, Wang Q, Zhang X, Zhao Y. Application of methanol and sweet potato vine hydrolysate as enhancers of citric acid production by Aspergillus niger. BIORESOUR BIOPROCESS 2017; 4:35. [PMID: 28804701 PMCID: PMC5532408 DOI: 10.1186/s40643-017-0166-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 07/20/2017] [Indexed: 12/03/2022] Open
Abstract
Background Agricultural waste is as an alternative low-cost carbon source or beneficial additives which catch most people’s eyes. In addition, methanol and sweet potato vine hydrolysate (SVH) have been reported as the efficient enhancers of fermentation according to some reports. The objective of the present study was to confirm SVH as an efficient additive in CA production and explore the synergistic effects of methanol and SVH in fermentation reactions. Results The optimal fermentation conditions resulted in a maximum citric acid concentration of 3.729 g/L. The final citric acid concentration under the optimized conditions was increased by 3.6-fold over the original conditions, 0.49-fold over the optimized conditions without methanol, and 1.8-fold over the optimized conditions in the absence of SVH. Kinetic analysis showed that Qp, Yp/s, and Yx/s in the optimized systems were significantly improved compared with those obtained in the absence of methanol or SVH. Further, scanning electron microscopy (SEM) revealed that methanol stress promoted the formation of conidiophores, while SVH could neutralize the effect and prolong Aspergillus niger vegetative growth. Cell viability analysis also showed that SVH might eliminate the harmful effects of methanol and enhance cell membrane integrity. Conclusions SVH was a superior additive for organic acid fermentation, and the combination of methanol and SVH displayed a significant synergistic effect. The research provides a preliminary theoretical basis for SVH practical application in the fermentation industry.
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Affiliation(s)
- Daobing Yu
- College of Forestry and Biotechnology, Zhejiang Agriculture and Forestry University, Lin'an, 311300 Zhejiang People's Republic of China
| | - Yanke Shi
- College of Forestry and Biotechnology, Zhejiang Agriculture and Forestry University, Lin'an, 311300 Zhejiang People's Republic of China
| | - Qun Wang
- College of Life Sciences, Zhejiang University, Hangzhou, 310058 Zhejiang People's Republic of China
| | - Xin Zhang
- College of Forestry and Biotechnology, Zhejiang Agriculture and Forestry University, Lin'an, 311300 Zhejiang People's Republic of China
| | - Yuhua Zhao
- College of Life Sciences, Zhejiang University, Hangzhou, 310058 Zhejiang People's Republic of China
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Bonturi N, Crucello A, Viana AJC, Miranda EA. Microbial oil production in sugarcane bagasse hemicellulosic hydrolysate without nutrient supplementation by a Rhodosporidium toruloides adapted strain. Process Biochem 2017. [DOI: 10.1016/j.procbio.2017.03.007] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Zhang H, Li Y, Lu Z, Wu M, Shi R, Chen L. Highly efficient synthesis of biodiesel catalyzed by CF3SO3H-functionalized ionic liquids: experimental design and study with response surface methodology. REACTION KINETICS MECHANISMS AND CATALYSIS 2017. [DOI: 10.1007/s11144-017-1171-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Liu LP, Zong MH, Linhardt RJ, Lou WY, Li N, Huang C, Wu H. Mechanistic insights into the effect of imidazolium ionic liquid on lipid production by Geotrichum fermentans. BIOTECHNOLOGY FOR BIOFUELS 2016; 9:266. [PMID: 28018484 PMCID: PMC5162095 DOI: 10.1186/s13068-016-0682-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 12/06/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND Ionic liquid (IL) pretreatment has emerged as a promising technique that enables complete utilization of lignocellulosic biomass for biofuel production. However, imidazolium IL has recently been shown to exhibit inhibitory effect on cell growth and product formation of industrial microbes, such as oleaginous microorganisms. To date, the mechanism of this inhibition remains largely unknown. RESULTS In this study, the feasibility of [Bmim][OAc]-pretreated rice straw hydrolysate as a substrate for microbial lipid production by Geotrichum fermentans, also known as Trichosporon fermentans, was evaluated. The residual [Bmim][OAc] present in the hydrolysate caused a reduction in biomass and lipid content (43.6 and 28.1%, respectively) of G. fermentans, compared with those of the control (7.8 g/L and 52.6%, respectively). Seven imidazolium ILs, [Emim][DEP], [Emim]Cl, [Amim]Cl, [Bmim]Cl, [Bzmim]Cl, [Emim][OAc], and [Bmim][OAc], capable of efficient pretreatment of lignocellulosic biomass were tested for their effects on the cell growth and lipid accumulation of G. fermentans to better understand the impact of imidazolium IL on the lipid production. All the ILs tested inhibited the cell growth and lipid accumulation. In addition, both the cation and the anion of IL contributed to IL toxicity. The side chain of IL cations showed a clear impact on toxicity. On examining IL anions, [OAc]- was found to be more toxic than those of [DEP]- and Cl-. IL exhibited its toxicity by inhibiting sugar consumption and key enzyme (malic enzyme and ATP-citrate lyase) activities of G. fermentans. Cell membrane permeability was also altered to different extents in the presence of various ILs. Scanning electron microscopy revealed that IL induces fibrous structure on the surface of G. fermentans cell, which might represent an adaptive mechanism of the yeast to IL. CONCLUSIONS This work gives some mechanistic insights into the impact of imidazolium IL on the cell growth and lipid accumulation of oleaginous yeast, which is important for IL integration in lignocellulosic biofuel production, especially for microbial lipid production.
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Affiliation(s)
- Li-Ping Liu
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou Higher Education Mega Centre, 382 East Waihuan Rd., Panyu District, Guangzhou, 510006 China
| | - Min-Hua Zong
- School of Food Science and Engineering, South China University of Technology, Room 409, Building 13, 381 Wushan Rd., Tianhe District, Guangzhou, 510640 China
| | - Robert J. Linhardt
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York, 12180 USA
| | - Wen-Yong Lou
- School of Food Science and Engineering, South China University of Technology, Room 409, Building 13, 381 Wushan Rd., Tianhe District, Guangzhou, 510640 China
| | - Ning Li
- School of Food Science and Engineering, South China University of Technology, Room 409, Building 13, 381 Wushan Rd., Tianhe District, Guangzhou, 510640 China
| | - Chao Huang
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences, 2 Nengyuan Rd., Tianhe District, Guangzhou, 510640 China
| | - Hong Wu
- School of Food Science and Engineering, South China University of Technology, Room 409, Building 13, 381 Wushan Rd., Tianhe District, Guangzhou, 510640 China
- Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, 381 Wushan Rd., Tianhe District, Guangzhou, 510640 China
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Yuan B, Xue LW, Zhang QY, Kong WW, Peng J, Kou M, Jiang JH. Essential Oil from Sweet Potato Vines, a Potential New Natural Preservative, and an Antioxidant on Sweet Potato Tubers: Assessment of the Activity and the Constitution. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:7481-7491. [PMID: 27624288 DOI: 10.1021/acs.jafc.6b03175] [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] [Indexed: 06/06/2023]
Abstract
Pathogenic fungi and oxidation are the major factors that cause the deterioration of sweet potatoes and also cause the loss of quality that makes consumption unsafe. In the present study, the in vitro results demonstrate that the essential oil from sweet potato vines exhibits significantly enhanced activity compared to that of the control. Furthermore, the essential oil can actively inhibit the growth of some common microorganisms inducing pathogenic bacteria and fungi (inhibition rates above 50% at low concentrations). A total of 31 constituents were identified using GC-MS and confirmed that linalool and p-hydroxybenzoic acid are the major active ingredients. The experiment involving actual tubers showed that the essential oil could retains its quality and effectiveness again the fungus disease. This suggests that it could be used in the food industry to increase the shelf life of stored produce (tubers) to ensure food safety without the use of additives or preservatives.
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Affiliation(s)
- Bo Yuan
- The Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province & School of Life Science, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China
| | - Ling-Wei Xue
- The Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province & School of Life Science, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China
| | - Qiu-Yue Zhang
- The Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province & School of Life Science, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China
| | - Wan-Wan Kong
- Department of Environmental Monitoring and Protection, Peixian, Xuzhou, Jiangsu 221600, China
| | - Jun Peng
- The Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province & School of Life Science, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China
| | - Meng Kou
- The Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province & School of Life Science, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China
- Xuzhou Sweet Potato Research Institute, Chinese Academy of Agricultural Science , Xuzhou, Jiangsu 221131, China
| | - Ji-Hong Jiang
- The Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province & School of Life Science, Jiangsu Normal University , Xuzhou, Jiangsu 221116, China
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Comparative genome analysis of the oleaginous yeast Trichosporon fermentans reveals its potential applications in lipid accumulation. Microbiol Res 2016; 192:203-210. [PMID: 27664738 DOI: 10.1016/j.micres.2016.07.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 07/19/2016] [Accepted: 07/19/2016] [Indexed: 11/22/2022]
Abstract
In this work, Trichosporon fermentans CICC 1368, which has been shown to accumulate cellular lipids efficiently using industry-agricultural wastes, was subjected to preliminary genome analysis, yielding a genome size of 31.3 million bases and 12,702 predicted protein-coding genes. Our analysis also showed a high degree of gene duplications and unique genes compared with those observed in other oleaginous yeasts, with 3-4-fold more genes related to fatty acid elongation and degradation compared with those in Rhodosporidium toruloides NP11 and Yarrowia lipolytica CLIB122. Phylogenetic analysis with other oleaginous microbes suggested that the lipogenic capacity of T. fermentans was obtained during evolution after the divergence of genera. Thus, our study provided the first draft genome and comparative analysis of T. fermentans, laying the foundation for its genetic improvement to facilitate cost-effective lipid production.
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17
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Production of Palmitoleic and Linoleic Acid in Oleaginous and Nonoleaginous Yeast Biomass. Int J Anal Chem 2016; 2016:7583684. [PMID: 27022398 PMCID: PMC4789058 DOI: 10.1155/2016/7583684] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2015] [Revised: 01/25/2016] [Accepted: 02/01/2016] [Indexed: 11/23/2022] Open
Abstract
We investigated the possibility of utilizing both oleaginous yeast species accumulating large amounts of lipids (Yarrowia lipolytica, Rhodotorula glutinis, Trichosporon cutaneum, and Candida sp.) and traditional biotechnological nonoleaginous ones (Kluyveromyces polysporus, Torulaspora delbrueckii, and Saccharomyces cerevisiae) as potential producers of dietetically important major fatty acids. The main objective was to examine the cultivation conditions that would induce a high ratio of dietary fatty acids and biomass. Though genus-dependent, the type of nitrogen source had a higher influence on biomass yield than the C/N ratio. The nitrogen source leading to the highest lipid accumulation was potassium nitrate, followed by ammonium sulfate, which is an ideal nitrogen source supporting, in both oleaginous and nonoleaginous species, sufficient biomass growth with concomitantly increased lipid accumulation. All yeast strains displayed high (70–90%) content of unsaturated fatty acids in total cell lipids. The content of dietary fatty acids of interest, namely, palmitoleic acid and linoleic acid, reached in Kluyveromyces and Trichosporon strains over 50% of total fatty acids and the highest yield, over 280 mg per g of dry cell weight of these fatty acids, was observed in Trichosporon with ammonium sulfate as nitrogen source at C/N ratio 70.
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18
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Patel A, Sindhu DK, Arora N, Singh RP, Pruthi V, Pruthi PA. Biodiesel production from non-edible lignocellulosic biomass of Cassia fistula L. fruit pulp using oleaginous yeast Rhodosporidium kratochvilovae HIMPA1. BIORESOURCE TECHNOLOGY 2015; 197:91-98. [PMID: 26318927 DOI: 10.1016/j.biortech.2015.08.039] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 08/05/2015] [Accepted: 08/07/2015] [Indexed: 06/04/2023]
Abstract
This study explored biodiesel production from a low cost, abundant, non-edible lignocellulosic biomass from aqueous extract of Cassia fistula L. (CAE) fruit pulp. The CAE was utilized as substrate for cultivating novel oleaginous yeast Rhodosporidium kratochvilovae HIMPA1. This oleaginous yeast accumulates high amount of triacylglycerides as large intracellular lipid droplets (4.35±0.54μm) using CAE as sole nutritional source. Total lipids (4.86±0.54g/l) with lipid content of 53.18% (w/w) were produced by R. kratochvilovae HIMPA1 on CAE. The FAME profile obtained revealed palmitic acid (C16:0) 43.06%, stearic acid (C18:0) 28.74%, and oleic acid (C18:1) 17.34% as major fatty acids. High saturated fatty acids content (72.58%) can be blended with high PUFA feedstocks to make it an industrially viable renewable energy product.
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Affiliation(s)
- Alok Patel
- Molecular Microbiology Laboratory, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT R), Roorkee, Uttarakhand 247667, India
| | - Dev K Sindhu
- Molecular Microbiology Laboratory, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT R), Roorkee, Uttarakhand 247667, India
| | - Neha Arora
- Molecular Microbiology Laboratory, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT R), Roorkee, Uttarakhand 247667, India
| | - Rajesh P Singh
- Molecular Microbiology Laboratory, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT R), Roorkee, Uttarakhand 247667, India
| | - Vikas Pruthi
- Molecular Microbiology Laboratory, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT R), Roorkee, Uttarakhand 247667, India
| | - Parul A Pruthi
- Molecular Microbiology Laboratory, Department of Biotechnology, Indian Institute of Technology Roorkee (IIT R), Roorkee, Uttarakhand 247667, India.
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19
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Probst KV, Schulte LR, Durrett TP, Rezac ME, Vadlani PV. Oleaginous yeast: a value-added platform for renewable oils. Crit Rev Biotechnol 2015; 36:942-55. [DOI: 10.3109/07388551.2015.1064855] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Kyle V. Probst
- IGERT in Biorefining,
- Bioprocessing and Renewable Energy Laboratory, Department of Grain Science and Industry,
| | | | - Timothy P. Durrett
- Department of Biochemistry and Molecular Biophysics, Kansas State University, Manhattan, KS, USA
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20
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Muniraj IK, Uthandi SK, Hu Z, Xiao L, Zhan X. Microbial lipid production from renewable and waste materials for second-generation biodiesel feedstock. ACTA ACUST UNITED AC 2015. [DOI: 10.1080/21622515.2015.1018340] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Iniya Kumar Muniraj
- Civil Engineering, College of Engineering and Informatics, National University of Ireland Galway, Galway, Ireland
| | - Siva Kumar Uthandi
- Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, India
| | - Zhenhu Hu
- School of Civil Engineering, Hefei University of Technology, Hefei, People's Republic of China
| | - Liwen Xiao
- Department of Civil, Structural and Environmental Engineering, Trinity College Dublin, Dublin, Ireland
| | - Xinmin Zhan
- Civil Engineering, College of Engineering and Informatics, National University of Ireland Galway, Galway, Ireland
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21
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Patel A, Pruthi V, Singh RP, Pruthi PA. Synergistic effect of fermentable and non-fermentable carbon sources enhances TAG accumulation in oleaginous yeast Rhodosporidium kratochvilovae HIMPA1. BIORESOURCE TECHNOLOGY 2015; 188:136-44. [PMID: 25769691 DOI: 10.1016/j.biortech.2015.02.062] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 02/12/2015] [Accepted: 02/13/2015] [Indexed: 05/23/2023]
Abstract
Novel strategy for enhancing TAG accumulation by simultaneous utilization of fermentable and non-fermentable carbon sources as substrate for cultivation of oleaginous yeast Rhodosporidium kratochvilovae HIMPA1 were undertaken in this investigation. The yeast strain showed direct correlation between the size of lipid bodies, visualized by BODIPY stain (493-515 nm) and TAG accumulation when examined on individual fermenting and non-fermenting carbon sources and their mixtures. Maximum TAG accumulation (μm) in glucose (2.38 ± 0.52), fructose (4.03 ± 0.38), sucrose (4.24 ± 0.45), glycerol (4.35 ± 0.54), xylulose (3.94 ± 0.12), and arabinose (2.98 ± 0.43) were observed. Synergistic effect of the above carbon sources (fermentable and non-fermentable) in equimolar concentration revealed maximum lipid droplet size of 5.35 ± 0.76 μm and cell size of 6.89 ± 0.97 μm. Total lipid content observed in mixed carbon sources was 9.26 g/l compared to glucose (6.2g/l). FAME profile revealed enhanced longer chain (C14:0-C24:0) fatty acids in mix carbon sources.
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Affiliation(s)
- Alok Patel
- Molecular Microbiology Laboratory, Biotechnology Department, Indian Institute of Technology Roorkee (IIT R), Roorkee, Uttarakhand 247667, India
| | - Vikas Pruthi
- Molecular Microbiology Laboratory, Biotechnology Department, Indian Institute of Technology Roorkee (IIT R), Roorkee, Uttarakhand 247667, India
| | - Rajesh P Singh
- Molecular Microbiology Laboratory, Biotechnology Department, Indian Institute of Technology Roorkee (IIT R), Roorkee, Uttarakhand 247667, India
| | - Parul A Pruthi
- Molecular Microbiology Laboratory, Biotechnology Department, Indian Institute of Technology Roorkee (IIT R), Roorkee, Uttarakhand 247667, India.
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22
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Shen Q, Lin H, Wang Q, Fan X, Yang Y, Zhao Y. Sweetpotato vines hydrolysate promotes single cell oils production of Trichosporon fermentans in high-density molasses fermentation. BIORESOURCE TECHNOLOGY 2015; 176:249-256. [PMID: 25461010 DOI: 10.1016/j.biortech.2014.11.045] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2014] [Revised: 11/08/2014] [Accepted: 11/10/2014] [Indexed: 06/04/2023]
Abstract
This study investigated the co-fermentation of molasses and sweetpotato vine hydrolysate (SVH) by Trichosporon fermentans. T. fermentans showed low lipid accumulation on pure molasses; however, its lipid content increased by 35% when 10% SVH was added. The strong influence of SVH on lipid production was further demonstrated by the result of sensitivity analysis on effects of factors based on an artificial neural network model because the relative importance value of SVH dosage for lipid production was only lower than that of fermentation time. Scanning electron microscope observation and flow cytometry of yeast cells grown in culture with and without SVH showed that less deformation cells were involved in the culture with SVH. The activity of malic enzyme, which plays a key role in fatty acid synthesis, increased from 2.4U/mg to 3.7U/mg after SVH added. All results indicated SVH is a good supplement for lipid fermentation on molasses.
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Affiliation(s)
- Qi Shen
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Hui Lin
- Institute of Environment Resource and Soil Fertilizer, Zhejiang Academy of Agriculture Science, Hangzhou 310021, China
| | - Qun Wang
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xiaoping Fan
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yuyi Yang
- Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
| | - Yuhua Zhao
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou 310058, China.
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Sitepu IR, Garay LA, Sestric R, Levin D, Block DE, German JB, Boundy-Mills KL. Oleaginous yeasts for biodiesel: Current and future trends in biology and production. Biotechnol Adv 2014; 32:1336-1360. [DOI: 10.1016/j.biotechadv.2014.08.003] [Citation(s) in RCA: 251] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2014] [Revised: 07/25/2014] [Accepted: 08/18/2014] [Indexed: 10/24/2022]
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Lin H, Wang Q, Shen Q, Ma J, Fu J, Zhao Y. Engineering Aspergillus oryzae A-4 through the chromosomal insertion of foreign cellulase expression cassette to improve conversion of cellulosic biomass into lipids. PLoS One 2014; 9:e108442. [PMID: 25251435 PMCID: PMC4177402 DOI: 10.1371/journal.pone.0108442] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 08/29/2014] [Indexed: 11/18/2022] Open
Abstract
A genetic modification scheme was designed for Aspergillus oryzae A-4, a natural cellulosic lipids producer, to enhance its lipid production from biomass by putting the spotlight on improving cellulase secretion. Four cellulase genes were separately expressed in A-4 under the control of hlyA promoter, with the help of the successful development of a chromosomal genetic manipulation system. Comparison of cellulase activities of PCR-positive transformants showed that these transformants integrated with celA gene and with celC gene had significantly (p<0.05) higher average FPAase activities than those strains integrated with celB gene and with celD gene. Through the assessment of cellulosic lipids accumulating abilities, celA transformant A2-2 and celC transformant D1-B1 were isolated as promising candidates, which could yield 101%-133% and 35.22%-59.57% higher amount of lipids than the reference strain A-4 (WT) under submerged (SmF) conditions and solid-state (SSF) conditions, respectively. Variability in metabolism associated to the introduction of cellulase gene in A2-2 and D1-B1 was subsequently investigated. It was noted that cellulase expression repressed biomass formation but enhanced lipid accumulation; whereas the inhibitory effect on cell growth would be shielded during cellulosic lipids production owing to the essential role of cellulase in substrate utilization. Different metabolic profiles also existed between A2-2 and D1-B1, which could be attributed to not only different transgene but also biological impacts of different integration. Overall, both simultaneous saccharification and lipid accumulation were enhanced in A2-2 and D1-B1, resulting in efficient conversion of cellulose into lipids. A regulation of cellulase secretion in natural cellulosic lipids producers could be a possible strategy to enhance its lipid production from lignocellulosic biomass.
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Affiliation(s)
- Hui Lin
- Institute of Environment Resource and Soil Fertilizer, Zhejiang Academy of Agriculture Science, Hangzhou, China
| | - Qun Wang
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Qi Shen
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou, China
| | - Junwei Ma
- Institute of Environment Resource and Soil Fertilizer, Zhejiang Academy of Agriculture Science, Hangzhou, China
| | - Jianrong Fu
- Institute of Environment Resource and Soil Fertilizer, Zhejiang Academy of Agriculture Science, Hangzhou, China
- * E-mail: (YZ); (JF)
| | - Yuhua Zhao
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou, China
- * E-mail: (YZ); (JF)
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25
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Tamer CE, Çopur ÖU. Development of Value-Added Products from Food Wastes. FOOD ENGINEERING SERIES 2014. [DOI: 10.1007/978-1-4939-1378-7_18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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26
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Sitepu IR, Sestric R, Ignatia L, Levin D, German JB, Gillies LA, Almada LAG, Boundy-Mills KL. Manipulation of culture conditions alters lipid content and fatty acid profiles of a wide variety of known and new oleaginous yeast species. BIORESOURCE TECHNOLOGY 2013; 144:360-9. [PMID: 23891835 PMCID: PMC3819430 DOI: 10.1016/j.biortech.2013.06.047] [Citation(s) in RCA: 126] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 06/13/2013] [Accepted: 06/15/2013] [Indexed: 05/08/2023]
Abstract
Oleaginous yeasts have been studied for oleochemical production for over 80 years. Only a few species have been studied intensely. To expand the diversity of oleaginous yeasts available for lipid research, we surveyed a broad diversity of yeasts with indicators of oleaginicity including known oleaginous clades, and buoyancy. Sixty-nine strains representing 17 genera and 50 species were screened for lipid production. Yeasts belonged to Ascomycota families, Basidiomycota orders, and the yeast-like algal genus Prototheca. Total intracellular lipids and fatty acid composition were determined under different incubation times and nitrogen availability. Thirteen new oleaginous yeast species were discovered, representing multiple ascomycete and basidiomycete clades. Nitrogen starvation generally increased intracellular lipid content. The fatty acid profiles varied with the growth conditions regardless of taxonomic affiliation. The dominant fatty acids were oleic acid, palmitic acid, linoleic acid, and stearic acid. Yeasts and culture conditions that produced fatty acids appropriate for biodiesel were identified.
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Affiliation(s)
- Irnayuli R Sitepu
- Department of Food Science and Technology, College of Agricultural and Environmental Sciences, University of California, Davis, CA 95616, USA.
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27
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Shen Q, Lin H, Zhan J, Wang Q, Zhao Y. Sweetpotato vines hydrolysate induces glycerol to be an effective substrate for lipid production of Trichosporon fermentans. BIORESOURCE TECHNOLOGY 2013; 136:725-9. [PMID: 23566467 DOI: 10.1016/j.biortech.2013.03.110] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2012] [Revised: 03/15/2013] [Accepted: 03/17/2013] [Indexed: 05/08/2023]
Abstract
By co-fermented with sweetpotato vines hydrolysate (SVH), glycerol can be used as an effective substrate for Trichosporon fermentans to produce lipids. Submerged fermentation results showed that T. fermentans exhibited a maximum lipid yield of 7.45 g l(-1) with a biomass of 17.95 g l(-1) on 10% SVH added glycerol mineral medium (Glycerol MM-10% SVH), which was 4.34-fold higher than that on glycerol mineral medium. Lipids produced on glycerol based media exhibited a significantly different fatty acid composition profile from that produced on sugar based media accompanying by a sharp increase in polyunsaturated fatty acids content. Biochemical behaviors characterization further demonstrated that SVH has a remarkable promoting effect on the biomass formation and glycerol uptake. The extremely high lipid yield on Glycerol MM-10% SVH was mainly attributed to the enhancement of SVH on biomass, although SVH is an excellent nutrient supplier for lipid accumulation due to its low nitrogen availability.
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Affiliation(s)
- Qi Shen
- Institute of Plant Science, College of Life Sciences, Zhejiang University, Hangzhou 310058, People's Republic of China
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