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Henrique JP, Casciatori FP, Thoméo JC. Automatic system for monitoring gaseous concentration in a packed-bed solid-state cultivation bioreactor. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Novotný Č, Fojtík J, Mucha M, Malachová K. Biodeterioration of Compost-Pretreated Polyvinyl Chloride Films by Microorganisms Isolated From Weathered Plastics. Front Bioeng Biotechnol 2022; 10:832413. [PMID: 35223795 PMCID: PMC8867010 DOI: 10.3389/fbioe.2022.832413] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 01/21/2022] [Indexed: 11/29/2022] Open
Abstract
Polyvinyl chloride (PVC) is a petroleum-based plastic used in various applications, polluting the environment because of its recalcitrance, large content of additives, and the presence of halogen. In our case study, a new, two-stage biodegradation technology that combined composting process used for PVC pretreatment with a subsequent PVC attack by newly-isolated fungal and bacterial strains under SSF conditions was used for biodegradation of commercial PVC films. The novelty consisted in a combined effect of the two biodegradation processes and the use for augmentation of microbial strains isolated from plastic-polluted environments. First, the ability of the newly-isolated strains to deteriorate PVC was tested in individual, liquid-medium- and SSF cultures. Higher mass-reductions of PVC films were obtained in the former cultures, probably due to a better mass transfer in liquid phase. Using the two-stage biodegradation technology the highest cumulative mass-reductions of 29.3 and 33.2% of PVC films were obtained after 110 days with Trichoderma hamatum and Bacillus amyloliquefaciens applied in the second stage in the SSF culture, respectively. However, FTIR analysis showed that the mass-reductions obtained represented removal of significant amounts of additives but the PVC polymer chain was not degraded.
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Affiliation(s)
- Čenek Novotný
- Laboratory of Environmental Biotechnology, Institute of Microbiology of the Czech Academy of Sciences, Prague, Czech Republic.,Department of Horticulture, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic.,Institute of Environmental Technology, CEET, VSB-Technical University of Ostrava, Ostrava, Czech Republic
| | - Jindřich Fojtík
- Department of Biology and Ecology, Faculty of Science, University of Ostrava, Ostrava, Czech Republic
| | - Martin Mucha
- Department of Chemistry, Faculty of Science, University of Ostrava, Ostrava, Czech Republic
| | - Kateřina Malachová
- Institute of Environmental Technology, CEET, VSB-Technical University of Ostrava, Ostrava, Czech Republic.,Department of Biology and Ecology, Faculty of Science, University of Ostrava, Ostrava, Czech Republic
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Solid-State Cultivation of Aspergillus niger-Trichoderma reesei from Sugarcane Bagasse with Vinasse in Bench Packed-Bed Column Bioreactor. Appl Biochem Biotechnol 2021; 193:2983-2992. [PMID: 33999390 DOI: 10.1007/s12010-021-03579-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 05/04/2021] [Indexed: 10/21/2022]
Abstract
Solid-state cultivation (SSC) is microbial growth on solid supports under limited water conditions. Citric acid is a microbial aerobic metabolic product with several industrial applications, with production potential that can be obtained by SSF. Several wastes from agro-industries are used in SSF, such as sugarcane bagasse and vinasse. Cultures of mixed fungi or co-cultures are used in this SSF in order to complement the inoculum's xylanolytic enzymes for action on the lignocellulosic material (bagasse). Thus, this study aims to evaluate the effect of inoculum (Aspergillus niger and Trichoderma reesei consortium) in the production of citric acid from sugarcane bagasse impregnated with vinasse using bench packed-bed reactors (PBR). The results show the importance of T. reesei and A. niger in inoculum at a ratio of 50:50 and 25:75, suggesting the use of solid support due to the complementation of the hydrolytic enzymes. The highest concentration of citric acid, approximately 1000 mg L-1, was obtained for 100 mm of bed height in 48 and 72 h, with maximum glucose yield in citric acid (2.2 mg citric acid mg glucose-1). kLa indicates that maintaining solid moisture and liquid film thickness is important to keep the oxygen transfer in SSC.
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Jatuwong K, Suwannarach N, Kumla J, Penkhrue W, Kakumyan P, Lumyong S. Bioprocess for Production, Characteristics, and Biotechnological Applications of Fungal Phytases. Front Microbiol 2020; 11:188. [PMID: 32117182 PMCID: PMC7034034 DOI: 10.3389/fmicb.2020.00188] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 01/27/2020] [Indexed: 12/30/2022] Open
Abstract
Phytases are a group of enzymes that hydrolyze the phospho-monoester bonds of phytates. Phytates are one of the major forms of phosphorus found in plant tissues. Fungi are mainly used for phytase production. The production of fungal phytases has been achieved under three different fermentation methods including solid-state, semi-solid-state, and submerged fermentation. Agricultural residues and other waste materials have been used as substrates for the evaluation of enzyme production in the fermentation process. Nutrients, physical conditions such as pH and temperature, and protease resistance are important factors for increasing phytase production. Fungal phytases are considered monomeric proteins and generally possess a molecular weight of between 14 and 353 kDa. Fungal phytases display a broad substrate specificity with optimal pH and temperature ranges between 1.3 and 8.0 and 37-67°C, respectively. The crystal structure of phytase has been studied in Aspergillus. Notably, thermostability engineering has been used to improve relevant enzyme properties. Furthermore, fungal phytases are widely used in food and animal feed additives to improve the efficiency of phosphorus intake and reduce the amount of phosphorus in the environment.
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Affiliation(s)
- Kritsana Jatuwong
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
- Center of Excellence in Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
- Ph.D. Degree Program in Applied Microbiology, Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
| | - Nakarin Suwannarach
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
- Center of Excellence in Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
| | - Jaturong Kumla
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
- Center of Excellence in Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
| | - Watsana Penkhrue
- School of Preclinic, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, Thailand
| | - Pattana Kakumyan
- School of Science, Mae Fah Luang University, Chiang Rai, Thailand
| | - Saisamorn Lumyong
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
- Center of Excellence in Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
- Academy of Science, The Royal Society of Thailand, Bangkok, Thailand
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Rayhane H, Josiane M, Gregoria M, Yiannis K, Nathalie D, Ahmed M, Sevastianos R. From flasks to single used bioreactor: Scale-up of solid state fermentation process for metabolites and conidia production by Trichoderma asperellum. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 252:109496. [PMID: 31605913 DOI: 10.1016/j.jenvman.2019.109496] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 08/08/2019] [Accepted: 08/28/2019] [Indexed: 06/10/2023]
Abstract
Currently, the increasing demand of biopesticides production to replace chemical pesticides which are excessively used has made solid state fermentation (SSF) technology the need of the hour. In spite of advantages, true potential of SSF process has not been fully realized at industrial scale. A fermentation process for 6-pentyl-a-pyrone (6 PP), conidia, and lytic enzymes (cellulases, lipase, amylase) production by Trichoderma asperellum TF1 was scaled-up from 250 mL flasks and glass Raimbault column packed with 20 g of solid substrates (dry weight) to 5 Kg of solid substrate by using a new plastic single used bioreactor. For column and single used bioreactor, the fermentation was done with the application of humid air during all the process however flasks are not hermetically closed that some oxygen could flow by diffusion. T. asperellum growth was investigated using a mixture of vine shoots, jatropha cake, olive pomace and olive oil as substrate in all systems in parallel at 25 °C during 7 days. Overall, the conditions applied on the single used bioreactor resulted in the optimum 6-PP production (7.36 ± 0.37 mg g DM-1), lipases (38.73 ± 0.21U/g DM), amylases (15.22 ± 0.13 U/g DM), and conidia production (8.55 ± 0.04 × 109 conidia/g DM).
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Affiliation(s)
- Hamrouni Rayhane
- Aix Marseille Univ, Avignon Université, CNRS, IRD, IMBE, Marseille, France; Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia; Univ Tunis El Manar, FST, Campus Universitaire, Tunis, Tunisia.
| | - Molinet Josiane
- Aix Marseille Univ, Avignon Université, CNRS, IRD, IMBE, Marseille, France
| | - Mitropoulou Gregoria
- Laboratory of Applied Microbiology and Biotechnology, Department of Molecular Biology and Genetics, Democritus University of Thrace, University Campus, Alexandroupolis, GR, 68100, Greece
| | - Kourkoutas Yiannis
- Laboratory of Applied Microbiology and Biotechnology, Department of Molecular Biology and Genetics, Democritus University of Thrace, University Campus, Alexandroupolis, GR, 68100, Greece
| | - Dupuy Nathalie
- Aix Marseille Univ, Avignon Université, CNRS, IRD, IMBE, Marseille, France
| | - Masmoudi Ahmed
- Univ. Manouba, ISBST, BVBGR-LR11ES31, Biotechpole Sidi Thabet, 2020, Ariana, Tunisia; Univ Tunis El Manar, FST, Campus Universitaire, Tunis, Tunisia
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Singh J, Kumar P, Saharan V, Kapoor RK. Simultaneous laccase production and transformation of bisphenol-A and triclosan using Trametes versicolor. 3 Biotech 2019; 9:129. [PMID: 30863708 DOI: 10.1007/s13205-019-1648-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 02/22/2019] [Indexed: 12/14/2022] Open
Abstract
New age micro-pollutants, bisphenol-A (BPA) and triclosan (TCA), known for their carcinogenic effects in living organisms can effectively be removed from water using laccase from Trametes versicolor. Laccase was produced from T. versicolor JSRK13 in both submerged and solid-state fermentation (SmF and SSF) conditions. In SmF, T. versicolor JSRK13 gave the maximum production of laccase on the 10th day with an activity of 22 U mL- 1, whereas, in SSF 185 U g- 1 of the enzyme was produced on the 17th day. Maximum production of laccase was observed with Parthenium as substrate. Parthenium, with a particle size of 3-5 mm having 60% moisture was found to be a suitable substrate for laccase production and simultaneous transformation (LPST) of BPA in a synergistic manner. A one-step concentration using 85% ammonium sulphate followed by dialysis was sufficient to give 6.7-fold purification of laccase from the crude culture filtrate. Transformation of BPA was achieved in both SmF and SSF conditions along with the production of laccase, whereas TCA was degraded with free enzyme only. Above 90% of BPA (55-5 mg L- 1) was degraded using the LPST strategy with HBT acting as a mediator in the reaction. LPST strategy did not work for TCA as it completely inhibits the growth of T. versicolor JSRK13. TCA was degraded up to 75% (1.5-0.375 mg L- 1) by the free enzyme. Our study of simultaneous laccase production and transformation proved to be efficacious in case of BPA. The results indicate that industrial and sewage wastewater containing BPA can potentially be treated with T. versicolor JSRK13 laccase. The described strategy can further be used to develop a bioprocess which can work both on solid and liquid wastes containing BPA.
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Affiliation(s)
- Jagdeep Singh
- 1Enzyme Biotechnology Laboratory, Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana 124001 India
| | - Punit Kumar
- 2Department of Biotechnology, University Institute of Engineering and Technology, Maharshi Dayanand University, Rohtak, India
| | - Vicky Saharan
- 1Enzyme Biotechnology Laboratory, Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana 124001 India
| | - Rajeev Kumar Kapoor
- 1Enzyme Biotechnology Laboratory, Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana 124001 India
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Jin G, Zhu Y, Rinzema A, Wijffels RH, Ge X, Xu Y. Water dynamics during solid-state fermentation by Aspergillus oryzae YH6. BIORESOURCE TECHNOLOGY 2019; 277:68-76. [PMID: 30658338 DOI: 10.1016/j.biortech.2019.01.038] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 01/07/2019] [Accepted: 01/08/2019] [Indexed: 06/09/2023]
Abstract
Water is crucial for microbial growth, heat transfer and substrate hydrolysis, and dynamically changes with time in solid-state fermentation. However, water dynamics in the solid substrate is difficult to define and measure. Here, nuclear magnetic resonance was used to monitor water dynamics during the pure culture of Aspergillus oryzae YH6 on wheat in a model system to mimic solid starter (Qu or Koji) preparation. During fermentation, overall water content gradually decreased from 0.84 to 0.36 g/g, and water activity decreased from 0.99 to 0.93. Water content in different state (bound, immobilized and free) changed differently and all moved to more "bound" direction. The internal water distribution over the substrate matrix also showed a faster reduction inward both in the radical and axial direction. Our findings provide the prerequisites for optimal processes where water dynamics in solid-state fermentation can be monitored and controlled.
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Affiliation(s)
- Guangyuan Jin
- State Key Laboratory of Food Science and Technology, The Key Laboratory of Industrial Biotechnology, Ministry of Education, Synergetic Innovation Centre of Food Safety and Nutrition, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China; Bioprocess Engineering, Wageningen University and Research, P.O. Box 16, 6700 AA Wageningen, The Netherlands
| | - Yang Zhu
- Bioprocess Engineering, Wageningen University and Research, P.O. Box 16, 6700 AA Wageningen, The Netherlands
| | - Arjen Rinzema
- Bioprocess Engineering, Wageningen University and Research, P.O. Box 16, 6700 AA Wageningen, The Netherlands
| | - René H Wijffels
- Bioprocess Engineering, Wageningen University and Research, P.O. Box 16, 6700 AA Wageningen, The Netherlands; Nord University, Faculty of Biosciences and Aquaculture, N-8049 Bodø, Norway
| | - Xiangyang Ge
- State Key Laboratory of Food Science and Technology, The Key Laboratory of Industrial Biotechnology, Ministry of Education, Synergetic Innovation Centre of Food Safety and Nutrition, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Yan Xu
- State Key Laboratory of Food Science and Technology, The Key Laboratory of Industrial Biotechnology, Ministry of Education, Synergetic Innovation Centre of Food Safety and Nutrition, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu 214122, China.
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Martínez O, Sánchez A, Font X, Barrena R. Enhancing the bioproduction of value-added aroma compounds via solid-state fermentation of sugarcane bagasse and sugar beet molasses: Operational strategies and scaling-up of the process. BIORESOURCE TECHNOLOGY 2018; 263:136-144. [PMID: 29738976 DOI: 10.1016/j.biortech.2018.04.106] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 04/23/2018] [Accepted: 04/24/2018] [Indexed: 06/08/2023]
Abstract
Bioproduction of generally recognized as safe (GRAS) products starting with low-cost raw materials has become significant in the biorefinery concept. Thus, the solid-state fermentation (SSF) of agro-industrial residues using GRAS strains appears as alternative to obtain aroma compounds. Here, the SSF of the mixture sugarcane bagasse/sugar beet molasses was used for producing a mixture of value-added fruit-like compounds. The study aimed to enhance the production and ester selectivity evaluating three operational strategies at three scales (0.5, 4.5 and 22 L) using non-sterilized residues. While the average total volatile production was 120 mgVol per gram of dry substrate (g-1ITS), fed-batch operation promoted the highest increases in the ester content up to 57 mgEst g-1ITS, an 88 and 59% more than in the static-batch and intermittent mixing modes respectively. Alternative operational strategies have compensated the scale-up adverse effects in the bioproduction, moving towards a sustainable large-scale application in a circular economy scheme.
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Affiliation(s)
- Oscar Martínez
- Composting Research Group, Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain
| | - Antoni Sánchez
- Composting Research Group, Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain.
| | - Xavier Font
- Composting Research Group, Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain
| | - Raquel Barrena
- Composting Research Group, Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain
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Borszcz V, Boscato TRP, Antunes A, Zeni J, Backes GT, Valduga E. Recovery of Pectinase Obtained by Solid-State Cultivation of Agro-Industrial Residues. Ind Biotechnol (New Rochelle N Y) 2017. [DOI: 10.1089/ind.2017.0005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Valeria Borszcz
- Department of Food Engineering, Universidade Regional Integrada do Alto Uruguai e Missões, URI Erechim, Erechim, Rio Grande do Sul, Brazil
- Federal Institute of Education, Science, and Technology, Erechim, Rio Grande do Sul, Brazil
| | - Taísa Renata Piotroski Boscato
- Department of Food Engineering, Universidade Regional Integrada do Alto Uruguai e Missões, URI Erechim, Erechim, Rio Grande do Sul, Brazil
| | - Angela Antunes
- Department of Food Engineering, Universidade Regional Integrada do Alto Uruguai e Missões, URI Erechim, Erechim, Rio Grande do Sul, Brazil
| | - Jamile Zeni
- Department of Food Engineering, Universidade Regional Integrada do Alto Uruguai e Missões, URI Erechim, Erechim, Rio Grande do Sul, Brazil
| | - Geciane Toniazzo Backes
- Department of Food Engineering, Universidade Regional Integrada do Alto Uruguai e Missões, URI Erechim, Erechim, Rio Grande do Sul, Brazil
| | - Eunice Valduga
- Department of Food Engineering, Universidade Regional Integrada do Alto Uruguai e Missões, URI Erechim, Erechim, Rio Grande do Sul, Brazil
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Zhang Y, Liu J, Zhou Y, Ge Y. Spore Production of Clonostachys rosea in a New Solid-state Fermentation Reactor. Appl Biochem Biotechnol 2014; 174:2951-9. [DOI: 10.1007/s12010-014-1239-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 09/10/2014] [Indexed: 10/24/2022]
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Bastos RG, Motta FL, Santana MHA. Oxygen Transfer in Solid-State Cultivation Under Controlled Moisture Conditions. Appl Biochem Biotechnol 2014; 174:708-18. [DOI: 10.1007/s12010-014-1101-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 07/22/2014] [Indexed: 10/24/2022]
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Casciatori FP, Laurentino CL, da Costa KKL, Casciatori PA, Thoméo JC. Hygroscopic Properties of Orange Pulp and Peel. J FOOD PROCESS ENG 2013. [DOI: 10.1111/jfpe.12049] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Fernanda Perpétua Casciatori
- Departamento de Engenharia e Tecnologia de Alimentos; Instituto de Biociências, Letras e Ciências Exatas; Universidade Estadual Paulista (UNESP); Rua Cristóvão Colombo 2265 Sao José do Rio Preto 15054000 Brazil
| | - Carmem Lúcia Laurentino
- Departamento de Engenharia e Tecnologia de Alimentos; Instituto de Biociências, Letras e Ciências Exatas; Universidade Estadual Paulista (UNESP); Rua Cristóvão Colombo 2265 Sao José do Rio Preto 15054000 Brazil
| | - Karen Kristhine Leal da Costa
- Departamento de Engenharia e Tecnologia de Alimentos; Instituto de Biociências, Letras e Ciências Exatas; Universidade Estadual Paulista (UNESP); Rua Cristóvão Colombo 2265 Sao José do Rio Preto 15054000 Brazil
| | - Priscila Aparecida Casciatori
- Departamento de Engenharia e Tecnologia de Alimentos; Instituto de Biociências, Letras e Ciências Exatas; Universidade Estadual Paulista (UNESP); Rua Cristóvão Colombo 2265 Sao José do Rio Preto 15054000 Brazil
| | - João Cláudio Thoméo
- Departamento de Engenharia e Tecnologia de Alimentos; Instituto de Biociências, Letras e Ciências Exatas; Universidade Estadual Paulista (UNESP); Rua Cristóvão Colombo 2265 Sao José do Rio Preto 15054000 Brazil
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Zhang YY, Liu JH, Zhou YM, Zhang YY, Liu Y, Gong TY, Wang J. A new two-phase kinetic model of sporulation of Clonostachys rosea in a new solid-state fermentation reactor. Process Biochem 2013. [DOI: 10.1016/j.procbio.2013.03.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Effect of forced aeration on citric acid production by Aspergillus sp. mutants in SSF. World J Microbiol Biotechnol 2013; 29:2317-24. [DOI: 10.1007/s11274-013-1397-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 06/03/2013] [Indexed: 10/26/2022]
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Abstract
Conidia of Beauveria bassiana Bb-202, which have the potential for the control of the coleopteran pests, were produced on rice by solid-state fermentation (SSF) using tray bioreactor. As the solid substrate thickness increased, the production of conidia decreased. By cutting substrate into many small uniform pieces, metabolic heat and gas transfer in center of substrate could be improved. We concluded that the highest yield of 3.94×1012 conidia kg-1 rice was obtained as the substrate of 2cm thickness was cut into many small pieces (6cm×4cm×2cm). And the average yield of conidia increases by 45%. It indicated that cut solid substrate into many pieces would increasing the surface area of substrate. So the conidia yields were significantly increased.
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