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Hawaz E, Tafesse M, Tesfaye A, Beyene D, Kiros S, Kebede G, Boekhout T, Theelen B, Groenewald M, Degefe A, Degu S, Admas A, Muleta D. Isolation and characterization of bioethanol producing wild yeasts from bio-wastes and co-products of sugar factories. ANN MICROBIOL 2022. [DOI: 10.1186/s13213-022-01695-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Purpose
Yeasts are widely used for the production of bioethanol from biomasses rich in sugar. The present study was aimed at isolating, screening, and characterizing fermentative wild yeast recovered from bio-waste and co-products of Ethiopian sugar factories for bioethanol production using sugarcane molasses as a substrate.
Method
The wild yeasts were identified according to their cellular morphology and D1/D2 and ITS1-5.8S-ITS2 rDNA sequencing. Analysis of ethanol and by-product concentration was done by HPLC equipped with a UV detector. Higher alcohols, acetaldehyde, and methanol were analyzed using GC-MS equipped with a flame ionization detector (FID).
Result
Seven strains (Meyerozyma caribbica MJTm3, Meyerozyma caribbica MJTPm4, Meyerozyma caribbica SHJF, Saccharomyces cerevisiae TA2, Wickerhamomyces anomalus MJTPm2, Wickerhamomyces anomalus 4m10, and Wickerhamomyces anomalus HCJ2F) were found tolerant to 18% (v/v) ethanol, whereas one strain Meyerozyma caribbica MJTm3 tolerated 20%. These strains also showed tolerance to 45°C, 50% of sugar, and pH 2–10. Meyerozyma caribbica MJTm3 produced 12.7% (v/v) of alcohol with an actual ethanol concentration of 26 g L−1, an ethanol yield of 47%, 78% of theoretical yield, and a productivity of 0.54 g L−1 h−1 from 30 °Brix of molasses at 48 h incubation under laboratory scale. Based on the one variable at a time optimization (OVAT), the optimal parameters for maximum bioethanol production were at initial pH 5.5, 35 °Brix, 30°C, 15% inoculum size, 150 rpm, 4 g L−1 di-ammonium phosphate supplement, and 48 h incubation. Under these optimum conditions, 14% (v/v) alcohol, 42 g L−1 actual ethanol concentration, 69% ethanol yield, 89% of theoretical yield, and productivity of 0.88 g L−1 h−1 were obtained.
Conclusion
These results indicated that M. caribbica MJTm3 should further be evaluated, optimized, and improved for industrial bioethanol production due to its fermentation potential.
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Genotypic and phenotypic characterization of industrial autochthonous Saccharomyces cerevisiae for the selection of well-adapted bioethanol-producing strains. Fungal Biol 2022; 126:658-673. [DOI: 10.1016/j.funbio.2022.08.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 07/28/2022] [Accepted: 08/09/2022] [Indexed: 11/17/2022]
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Comprehensive Review on Potential Contamination in Fuel Ethanol Production with Proposed Specific Guideline Criteria. ENERGIES 2022. [DOI: 10.3390/en15092986] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Ethanol is a promising biofuel that can replace fossil fuel, mitigate greenhouse gas (GHG) emissions, and represent a renewable building block for biochemical production. Ethanol can be produced from various feedstocks. First-generation ethanol is mainly produced from sugar- and starch-containing feedstocks. For second-generation ethanol, lignocellulosic biomass is used as a feedstock. Typically, ethanol production contains four major steps, including the conversion of feedstock, fermentation, ethanol recovery, and ethanol storage. Each feedstock requires different procedures for its conversion to fermentable sugar. Lignocellulosic biomass requires extra pretreatment compared to sugar and starch feedstocks to disrupt the structure and improve enzymatic hydrolysis efficiency. Many pretreatment methods are available such as physical, chemical, physicochemical, and biological methods. However, the greatest concern regarding the pretreatment process is inhibitor formation, which might retard enzymatic hydrolysis and fermentation. The main inhibitors are furan derivatives, aromatic compounds, and organic acids. Actions to minimize the effects of inhibitors, detoxification, changing fermentation strategies, and metabolic engineering can subsequently be conducted. In addition to the inhibitors from pretreatment, chemicals used during the pretreatment and fermentation of byproducts may remain in the final product if they are not removed by ethanol distillation and dehydration. Maintaining the quality of ethanol during storage is another concerning issue. Initial impurities of ethanol being stored and its nature, including hygroscopic, high oxygen and carbon dioxide solubility, influence chemical reactions during the storage period and change ethanol’s characteristics (e.g., water content, ethanol content, acidity, pH, and electrical conductivity). During ethanol storage periods, nitrogen blanketing and corrosion inhibitors can be applied to reduce the quality degradation rate, the selection of which depends on several factors, such as cost and storage duration. This review article sheds light on the techniques of control used in ethanol fuel production, and also includes specific guidelines to control ethanol quality during production and the storage period in order to preserve ethanol production from first-generation to second-generation feedstock. Finally, the understanding of impurity/inhibitor formation and controlled strategies is crucial. These need to be considered when driving higher ethanol blending mandates in the short term, utilizing ethanol as a renewable building block for chemicals, or adopting ethanol as a hydrogen carrier for the long-term future, as has been recommended.
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Ahmad A, Naqvi SA, Jaskani MJ, Waseem M, Ali E, Khan IA, Faisal Manzoor M, Siddeeg A, Aadil RM. Efficient utilization of date palm waste for the bioethanol production through Saccharomyces cerevisiae strain. Food Sci Nutr 2021; 9:2066-2074. [PMID: 33841824 PMCID: PMC8020936 DOI: 10.1002/fsn3.2175] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 01/25/2021] [Accepted: 01/25/2021] [Indexed: 01/11/2023] Open
Abstract
Dates (Phoenix dactylifera L.) are rich in nutritional compounds, particularly in sugars. Sugars offer anaerobic fermentation, used for bioethanol production. Recently, researchers and industrialists finding ways to produce low-cost bioethanol on large scale using agricultural wastes. Date palm residual is the largest agricultural waste in Pakistan, which can be the cheapest source for bioethanol production, whereas the current study was designed to explore the possible utilization and the potential of date palm waste for bioethanol production through Saccharomyces cerevisiae grown in yeast extract, Bacto peptone, and d-glucose medium. The fermentation process resulted in the production of 15% (v/v) ethanol under the optimum condition of an incubation period of 72 hr and three sugars (glucose, fructose, and sucrose) were found in date waste. The functional group of ethanol (C2H5OH) was also found via Fourier-transform infrared spectroscopy (FTIR) analysis. Therefore, S. cerevisiae could be recommended for ethanol production due to short fermentation time at 25% inoculum in 30°C and reduced the processing cost. Common date varieties of low market value are a preferred substrate for the process of producing industrial ethanol. Additionally, proximate analysis of date fruit by near-infrared spectroscopy revealed moisture contents (16.84%), crude protein (0.3%), ash (9.8%), crude fat (2.6%), and neutral detergent fibers (13.4%). So, date fruit contains various nutrients for microbial growth for ethanol production.
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Affiliation(s)
- Arslan Ahmad
- Institute of Horticultural SciencesUniversity of Agriculture FaisalabadFaisalabadPakistan
| | - Summar A. Naqvi
- Institute of Horticultural SciencesUniversity of Agriculture FaisalabadFaisalabadPakistan
| | - Muhammad J. Jaskani
- Institute of Horticultural SciencesUniversity of Agriculture FaisalabadFaisalabadPakistan
| | - Muhammad Waseem
- Institute of Horticultural SciencesUniversity of Agriculture FaisalabadFaisalabadPakistan
| | - Ehsan Ali
- Punjab Bioenergy InstituteUniversity of AgricultureFaisalabadPakistan
| | - Iqrar A. Khan
- Institute of Horticultural SciencesUniversity of Agriculture FaisalabadFaisalabadPakistan
| | | | - Azhari Siddeeg
- Department of Food EngineeringFaculty of EngineeringUniversity of GeziraWad MedaniSudan
| | - Rana Muhammad Aadil
- National Institute of Food Science and TechnologyUniversity of Agriculture FaisalabadFaisalabadPakistan
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Aman Beshir J, Kebede M. In silico analysis of promoter regions and regulatory elements (motifs and CpG islands) of the genes encoding for alcohol production in Saccharomyces cerevisiaea S288C and Schizosaccharomyces pombe 972h. J Genet Eng Biotechnol 2021; 19:8. [PMID: 33428031 PMCID: PMC7801573 DOI: 10.1186/s43141-020-00097-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 11/17/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND The crucial factor in the production of bio-fuels is the choice of potent microorganisms used in fermentation processes. Despite the evolving trend of using bacteria, yeast is still the primary choice for fermentation. Molecular characterization of many genes from baker's yeast (Saccharomyces cerevisiaea), and fission yeast (Schizosaccharomyces pombe), have improved our understanding in gene structure and the regulation of its expression. This in silico study was done with the aim of analyzing the promoter regions, transcription start site (TSS), and CpG islands of genes encoding for alcohol production in S. cerevisiaea S288C and S. pombe 972h-. RESULTS The analysis revealed the highest promoter prediction scores (1.0) were obtained in five sequences (AAD4, SFA1, GRE3, YKL071W, and YPR127W) for S. cerevisiaea S288C TSS while the lowest (0.8) were found in three sequences (AAD6, ADH5, and BDH2). Similarly, in S. pombe 972h-, the highest (0.99) and lowest (0.88) prediction scores were obtained in five (Adh1, SPBC8E4.04, SPBC215.11c, SPAP32A8.02, and SPAC19G12.09) and one (erg27) sequences, respectively. Determination of common motifs revealed that S. cerevisiaea S288C had 100% coverage at MSc1 with an E value of 3.7e-007 while S. pombe 972h- had 95.23% at MSp1 with an E value of 2.6e+002. Furthermore, comparison of identified transcription factor proteins indicated that 88.88% of MSp1 were exactly similar to MSc1. It also revealed that only 21.73% in S. cerevisiaea S288C and 28% in S. pombe 972h- of the gene body regions had CpG islands. A combined phylogenetic analysis indicated that all sequences from both S. cerevisiaea S288C and S. pombe 972h- were divided into four subgroups (I, II, III, and IV). The four clades are respectively colored in blue, red, green, and violet. CONCLUSION This in silico analysis of gene promoter regions and transcription factors through the actions of regulatory structure such as motifs and CpG islands of genes encoding alcohol production could be used to predict gene expression profiles in yeast species.
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Affiliation(s)
- Jemal Aman Beshir
- Department of Applied Biology, School of Applied Natural Science, Adama Science and Technology University, P.O. Box 1888, Adama, Ethiopia
- Ethiopian Sugar Corporation, Sugar Academy, Wonji, Ethiopia
| | - Mulugeta Kebede
- Department of Applied Biology, School of Applied Natural Science, Adama Science and Technology University, P.O. Box 1888, Adama, Ethiopia
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Dhote L, Kumar S, Singh L, Kumar R. A systematic review on options for sustainable treatment and resource recovery of distillery sludge. CHEMOSPHERE 2021; 263:128225. [PMID: 33297181 DOI: 10.1016/j.chemosphere.2020.128225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 08/28/2020] [Accepted: 08/29/2020] [Indexed: 06/12/2023]
Abstract
Distillery sludge generated from the alcohol production plants is considered as a nuisance. It is one of the main sources of environmental pollution because of the presence of high amount of sulphate, phenolic compounds (500.3 ± 26.46 mg/kg), melanoidins, organic matter (14%) and heavy metals (like 18% Mn, 6% Ni and 4% Pb). Hence, advancement in the available techniques for managing this sludge is a prerequisite for its safe and sustainable disposal. The article delivers an assessment of the challenges involved in the treatment of distillery sludge, existing practices, disposal and possible routes for energy recovery. Considering the high nutritional and energy values of the distillery sludge, the associated limitations and challenges of the available sludge management options, it was aimed to highlight alternative methods of its treatment. The present review also compares the current distillery sludge management solutions concerning their environmental sustainability. The most widely used methods, including treatment and disposal techniques considering the current legislation in different countries, have also been dealt with. Furthermore, the study also deals with the resource recovery approaches in order to recover value-added products and available nutrients from distillery sludge. Resource and energy recovery options are therefore considered as sustainable solutions to fulfill the present and future energy requirement and visualize it as a potential opportunity instead of a nuisance.
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Affiliation(s)
- Lekha Dhote
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 2010 02, India; CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
| | - Sunil Kumar
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India.
| | - Lal Singh
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
| | - Rakesh Kumar
- CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nehru Marg, Nagpur, 440 020, India
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Mohamed ET, Mundhada H, Landberg J, Cann I, Mackie RI, Nielsen AT, Herrgård MJ, Feist AM. Generation of an E. coli platform strain for improved sucrose utilization using adaptive laboratory evolution. Microb Cell Fact 2019; 18:116. [PMID: 31255177 PMCID: PMC6599523 DOI: 10.1186/s12934-019-1165-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Accepted: 06/22/2019] [Indexed: 01/01/2023] Open
Abstract
Background Sucrose is an attractive industrial carbon source due to its abundance and the fact that it can be cheaply generated from sources such as sugarcane. However, only a few characterized Escherichia coli strains are able to metabolize sucrose, and those that can are typically slow growing or pathogenic strains. Methods To generate a platform strain capable of efficiently utilizing sucrose with a high growth rate, adaptive laboratory evolution (ALE) was utilized to evolve engineered E. coli K-12 MG1655 strains containing the sucrose utilizing csc genes (cscB, cscK, cscA) alongside the native sucrose consuming E. coli W. Results Evolved K-12 clones displayed an increase in growth and sucrose uptake rates of 1.72- and 1.40-fold on sugarcane juice as compared to the original engineered strains, respectively, while E. coli W clones showed a 1.4-fold increase in sucrose uptake rate without a significant increase in growth rate. Whole genome sequencing of evolved clones and populations revealed that two genetic regions were frequently mutated in the K-12 strains; the global transcription regulatory genes rpoB and rpoC, and the metabolic region related to a pyrimidine biosynthetic deficiency in K-12 attributed to pyrE expression. These two mutated regions have been characterized to confer a similar benefit when glucose is the main carbon source, and reverse engineering revealed the same causal advantages on M9 sucrose. Additionally, the most prevalent mutation found in the evolved E. coli W lineages was the inactivation of the cscR gene, the transcriptional repression of sucrose uptake genes. Conclusion The generated K-12 and W platform strains, and the specific sets of mutations that enable their phenotypes, are available as valuable tools for sucrose-based industrial bioproduction in the facile E. coli chassis. Electronic supplementary material The online version of this article (10.1186/s12934-019-1165-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Elsayed T Mohamed
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Building 220, Kemitorvet, Lyngby, 2800 Kgs, Denmark
| | - Hemanshu Mundhada
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Building 220, Kemitorvet, Lyngby, 2800 Kgs, Denmark
| | - Jenny Landberg
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Building 220, Kemitorvet, Lyngby, 2800 Kgs, Denmark
| | - Isaac Cann
- Department of Animal Sciences, Institute for Genomic Biology and Energy Biosciences Institute, University of Illinois, Urbana, IL, 61801, USA
| | - Roderick I Mackie
- Department of Animal Sciences, Institute for Genomic Biology and Energy Biosciences Institute, University of Illinois, Urbana, IL, 61801, USA
| | - Alex Toftgaard Nielsen
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Building 220, Kemitorvet, Lyngby, 2800 Kgs, Denmark
| | - Markus J Herrgård
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Building 220, Kemitorvet, Lyngby, 2800 Kgs, Denmark
| | - Adam M Feist
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Building 220, Kemitorvet, Lyngby, 2800 Kgs, Denmark. .,Department of Bioengineering, University of California, 9500 Gilman Drive La Jolla, San Diego, CA, 92093, USA.
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Wang ZP, Wang QQ, Liu S, Liu XF, Yu XJ, Jiang YL. Efficient Conversion of Cane Molasses Towards High-Purity Isomaltulose and Cellular Lipid Using an Engineered Yarrowia lipolytica Strain in Fed-Batch Fermentation. Molecules 2019; 24:E1228. [PMID: 30925836 PMCID: PMC6480463 DOI: 10.3390/molecules24071228] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2019] [Revised: 03/19/2019] [Accepted: 03/26/2019] [Indexed: 12/29/2022] Open
Abstract
: Cane molasses is one of the main by-products of sugar refineries, which is rich in sucrose. In this work, low-cost cane molasses was introduced as an alternative substrate for isomaltulose production. Using the engineered Yarrowia lipolytica, the isomaltulose production reached the highest (102.6 g L-¹) at flask level with pretreated cane molasses of 350 g L-¹ and corn steep liquor of 1.0 g L-¹. During fed-batch fermentation, the maximal isomaltulose concentration (161.2 g L-¹) was achieved with 0.96 g g-¹ yield within 80 h. Simultaneously, monosaccharides were completely depleted, harvesting the high isomaltulose purity (97.4%) and high lipid level (12.2 g L-¹). Additionally, the lipids comprised of 94.29% C16 and C18 fatty acids, were proved suitable for biodiesel production. Therefore, the bioprocess employed using cane molasses in this study was low-cost and eco-friendly for high-purity isomaltulose production, coupling with valuable lipids.
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Affiliation(s)
- Zhi-Peng Wang
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, Shandong 266071, China.
| | - Qin-Qing Wang
- Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, School of Marine Sciences, Sun Yat-Sen University, Guangzhou, Guangdong 510006, China.
- Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai 519000, China.
| | - Song Liu
- Development & Reform Bureau, West Coast New Area, Qingdao, Shandong 266000, China.
| | - Xiao-Fang Liu
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, Shandong 266071, China.
| | - Xin-Jun Yu
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China.
| | - Yun-Lin Jiang
- Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, School of Marine Sciences, Sun Yat-Sen University, Guangzhou, Guangdong 510006, China.
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Lai YT, Cheng KC, Lai CN, Lai YJ. Isolation and identification of aroma producing strain with esterification capacity from yellow water. PLoS One 2019; 14:e0211356. [PMID: 30763353 PMCID: PMC6375555 DOI: 10.1371/journal.pone.0211356] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 01/13/2019] [Indexed: 11/18/2022] Open
Abstract
Kaoliang is a refreshing fragranced type of Chinese spirits with slight apple fragrance that comes from ethyl acetate (EA). Special aromas are produced by esterification microorganisms, which affect the taste and quality of the wine. In this study, new yeast strains were isolated from yellow water, a by-product during fermentation process. Meanwhile, the optimal culture condition was determined for its growth and EA production. Three new strains, Kazachstaniaexigua, Candida humilis and Saccharomyces cerevisiae were identified from yellow water. Among these strains, S. cerevisiae S5 was the new and dominant strain. Results from response surface methodology showed that S. cerevisiae S5 produced 161.88 ppm of EA, in the medium with 4.91% yeast extract, 9.82% peptone, and 20.91% glucose after 96 hours of cultivation at 27.53°C. GC analysis showed that aroma compounds, such as EA, isoamyl acetate and 2-phenylethanol increased from the sample of optimal condition when compared to the one from initial fermentation condition.
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Affiliation(s)
- Yen-Tso Lai
- Institute of Biotechnology, National Taiwan University, Taipei, Taiwan
| | - Kuan-Chen Cheng
- Institute of Biotechnology, National Taiwan University, Taipei, Taiwan
- Graduate Institute of Food Science Technology, National Taiwan University, Taipei, Taiwan
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
| | - Chia-Nuan Lai
- Graduate Institute of Food Science Technology, National Taiwan University, Taipei, Taiwan
| | - Ying-Jang Lai
- Department of Food Science, National Quemoy University, Kinmen, Taiwan
- * E-mail:
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Jiru TM, Steyn L, Pohl C, Abate D. Production of single cell oil from cane molasses by Rhodotorula kratochvilovae (syn, Rhodosporidium kratochvilovae) SY89 as a biodiesel feedstock. Chem Cent J 2018; 12:91. [PMID: 30097852 PMCID: PMC6086781 DOI: 10.1186/s13065-018-0457-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 07/31/2018] [Indexed: 12/04/2022] Open
Abstract
Background Single cell oil has long been considered an alternative to conventional oil sources. The oil produced can also be used as a feedstock for biodiesel production. Oleaginous yeasts have relatively high growth and lipid production rates, can utilize a wide variety of cheap agro-industrial wastes such as molasses, and can accumulate lipids above 20% of their biomass when they are grown in a bioreactor under conditions of controlled excess carbon and nitrogen limitation. Results In this study, Rhodotorula kratochvilovae (syn, Rhodosporidium kratochvilovae) SY89 was cultivated in a nitrogen-limited medium containing cane molasses as a carbon source. The study aims to provide not only information on the production of single cell oil using R. kratochvilovae SY89 on cane molasses as a biodiesel feedstock, but also to characterize the biodiesel obtained from the resultant lipids. After determination of the sugar content in cane molasses, R. kratochvilovae SY89 was grown on the optimized cane molasses for 168 h. Under the optimized conditions, the yeast accumulated lipids up to 38.25 ± 1.10% on a cellular dry biomass basis. This amount corresponds to a lipid yield of 4.82 ± 0.27 g/L. The fatty acid profiles of the extracted yeast lipids were analyzed using gas chromatography, coupled with flame ionization detector. A significant amount of oleic acid (58.51 ± 0.76%), palmitic acid (15.70 ± 1.27%), linoleic acid (13.29 ± 1.18%) and low amount of other fatty acids were detected in the extracted yeast lipids. The lipids were used to prepare biodiesel and the yield was 85.30%. The properties of this biodiesel were determined and found to be comparable to the specifications established by ASTM D6751 and EN14214 related to biodiesel quality. Conclusions Based on the results obtained, the biodiesel from R. kratochvilovae SY89 oil could be a competitive alternative to conventional diesel fuel.
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Affiliation(s)
- Tamene Milkessa Jiru
- Department of Biotechnology, University of Gondar, P.O.Box: 196, Gondar, Ethiopia.
| | - Laurinda Steyn
- Department of Microbial, Biochemical and Food Biotechnology, University of the Free State, P.O.Box: 339, Bloemfontein, South Africa
| | - Carolina Pohl
- Department of Microbial, Biochemical and Food Biotechnology, University of the Free State, P.O.Box: 339, Bloemfontein, South Africa
| | - Dawit Abate
- Microbial, Cellular and Molecular Biology Department, College of Natural Sciences, Addis Ababa University, P.O.Box: 1176, Addis Ababa, Ethiopia
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Nikolaou A, Kourkoutas Y. Exploitation of olive oil mill wastewaters and molasses for ethanol production using immobilized cells of Saccharomyces cerevisiae. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:7401-7408. [PMID: 29280099 DOI: 10.1007/s11356-017-1051-6] [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: 07/13/2017] [Accepted: 12/13/2017] [Indexed: 06/07/2023]
Abstract
An alcoholic fermentation process is described, involving molasses, the main by-product of the sugar industry, blended with crude olive oil mill wastewaters (OOMWs) and immobilized Saccharomyces cerevisiae cells on delignified cellulosic material (DCM). For comparison, fermentations with free cells were also carried out. Initially, the optimum blending mixture for molasses dilution was sought after, while at a second step repeated batch fermentations at a temperature range 5-30 °C were performed to monitor the operational stability of the system. A 1/1 ratio of OOMWs/tap water blending mixture and cell immobilization resulted in higher fermentation parameters. Ethanol concentration and daily productivity values recorded at temperatures ≥ 20 °C (up to 67.8 g L-1 and 67.6 g L-1 d-1, respectively) could be adopted by the industrial sector, although the decline in fermentation efficiency observed, probably due to the toxicity effects of OOMWs. Finally, the potential of OOMWs treatment for ethanol production is highlighted and assessed.
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Affiliation(s)
- Anastasios Nikolaou
- Laboratory of Applied Microbiology and Biotechnology, Department of Molecular Biology & Genetics, Democritus University of Thrace, 681 00, Alexandroupolis, Greece
| | - Yiannis Kourkoutas
- Laboratory of Applied Microbiology and Biotechnology, Department of Molecular Biology & Genetics, Democritus University of Thrace, 681 00, Alexandroupolis, Greece.
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12
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Canseco Grellet M, Castagnaro A, Dantur K, De Boeck G, Ahmed P, Cárdenas G, Welin B, Ruiz R. A modified indirect mathematical model for evaluation of ethanol production efficiency in industrial-scale continuous fermentation processes. J Appl Microbiol 2016; 121:1026-37. [DOI: 10.1111/jam.13240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 03/29/2016] [Accepted: 07/19/2016] [Indexed: 11/28/2022]
Affiliation(s)
- M.A. Canseco Grellet
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - A. Castagnaro
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - K.I. Dantur
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - G. De Boeck
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - P.M. Ahmed
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - G.J. Cárdenas
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - B. Welin
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
| | - R.M. Ruiz
- Instituto de Tecnología Agroindustrial del Noroeste Argentino (ITANOA); Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET); Estación Experimental Agroindustrial Obispo Colombres (EEAOC); Las Talitas Tucumán Argentina
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Akbas MY, Stark BC. Recent trends in bioethanol production from food processing byproducts. J Ind Microbiol Biotechnol 2016; 43:1593-1609. [PMID: 27565674 DOI: 10.1007/s10295-016-1821-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 07/30/2016] [Indexed: 12/19/2022]
Abstract
The widespread use of corn starch and sugarcane as sources of sugar for the production of ethanol via fermentation may negatively impact the use of farmland for production of food. Thus, alternative sources of fermentable sugars, particularly from lignocellulosic sources, have been extensively investigated. Another source of fermentable sugars with substantial potential for ethanol production is the waste from the food growing and processing industry. Reviewed here is the use of waste from potato processing, molasses from processing of sugar beets into sugar, whey from cheese production, byproducts of rice and coffee bean processing, and other food processing wastes as sugar sources for fermentation to ethanol. Specific topics discussed include the organisms used for fermentation, strategies, such as co-culturing and cell immobilization, used to improve the fermentation process, and the use of genetic engineering to improve the performance of ethanol producing fermenters.
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Affiliation(s)
- Meltem Yesilcimen Akbas
- Department of Molecular Biology and Genetics, Gebze Technical University, Gebze-Kocaeli, Kocaeli, 41400, Turkey. .,Institute of Biotechnology, Gebze Technical University, Gebze-Kocaeli, Kocaeli, 41400, Turkey.
| | - Benjamin C Stark
- Biology Department, Illinois Institute of Technology, Chicago, IL, 60616, USA
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14
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Dubey R, Jakeer S, Gaur NA. Screening of natural yeast isolates under the effects of stresses associated with second-generation biofuel production. J Biosci Bioeng 2016; 121:509-16. [DOI: 10.1016/j.jbiosc.2015.09.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 09/04/2015] [Accepted: 09/08/2015] [Indexed: 11/16/2022]
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15
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Asif HK, Ehsan A, Kashaf Z, Abeera AA, Azra N, Muneeb Q. Comparative study of bioethanol production from sugarcane molasses by using Zymomonas mobilis and Saccharomyces cerevisiae. ACTA ACUST UNITED AC 2015. [DOI: 10.5897/ajb2015.14569] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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16
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Fadel, M, Abdel-Naser AZ, M. M, M. SH, A. MAA. Recycling of vinasse in ethanol fermentation and application in Egyptian distillery factories. ACTA ACUST UNITED AC 2014. [DOI: 10.5897/ajb2014.14083] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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