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Nemes SA, Fărcas AC, Ranga F, Teleky BE, Călinoiu LF, Dulf FV, Vodnar DC. Enhancing phenolic and lipid compound production in oat bran via acid pretreatment and solid-state fermentation with Aspergillus niger. N Biotechnol 2024; 83:91-100. [PMID: 39053684 DOI: 10.1016/j.nbt.2024.07.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2024] [Revised: 06/10/2024] [Accepted: 07/22/2024] [Indexed: 07/27/2024]
Abstract
Oat (Avena sativa) processing generates a large amount of by-products, especially oat bran. These by-products are excellent sources of bioactive compounds such as polyphenols and essential fatty acids. Therefore, enhancing the extraction of these bioactive substances and incorporating them into the human diet is critical. This study investigates the effect of acid pretreatment on the solid-state fermentation of oat bran with Aspergillus niger, with an emphasis on the bioaccessibility of phenolic acids and lipid profile. The results showed a considerable increase in reducing sugars following acid pretreatment. On the sixth day, there was a notable increase in the total phenolic content, reaching 58.114 ± 0.09 mg GAE/g DW, and the vanillic acid level significantly rose to 77.419 ± 0.27 μg/g DW. The lipid profile study revealed changes ranging from 4.66 % in the control to 7.33 % on the sixth day of SSF. Aside from biochemical alterations, antioxidant activity measurement using the DPPH technique demonstrated the maximum scavenging activity on day 4 (83.33 %). This study highlights acid pretreatment's role in enhancing bioactive compound accessibility in solid-state fermentation and its importance for functional food development.
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Affiliation(s)
- Silvia Amalia Nemes
- Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania; Faculty of Agriculture, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania.
| | - Anca Corina Fărcas
- Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania; Faculty of Agriculture, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania.
| | - Floricuta Ranga
- Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania; Faculty of Agriculture, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania.
| | - Bernadette-Emoke Teleky
- Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania; Faculty of Agriculture, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania.
| | - Lavinia Florina Călinoiu
- Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania; Faculty of Agriculture, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania.
| | - Francisc Vasile Dulf
- Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania; Faculty of Agriculture, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania.
| | - Dan Cristian Vodnar
- Faculty of Food Science and Technology, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania; Faculty of Agriculture, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Manastur 3-5, Cluj-Napoca 400372, Romania.
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Carvalho LC, Oliveira ALS, Carsanba E, Lopes A, Leal T, Ribeiro M, Fernandes S, Pintado M, Oliveira C. Removal of phenolic compounds from sugarcane syrup and impact on Saccharomyces cerevisiae fermentation for β-farnesene production. Biotechnol J 2024; 19:e2300465. [PMID: 38403437 DOI: 10.1002/biot.202300465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 12/17/2023] [Accepted: 01/03/2024] [Indexed: 02/27/2024]
Abstract
This work aimed to study for the first time the effects of phenolic compounds from sugarcane syrup on Saccharomyces cerevisiae β-farnesene fermentation by removing them from this feedstock. Syrup purification was optimized through a central composite design using five types of activated charcoal: three contact times (1-24 h) and three adsorbent concentrations (10-150 g L-1 ). The optimal purification condition-charcoal pellets at 115 g L-1 and contact time of 12.5 h-led to 96.7% of phenolic compounds removal and 43.7% of syrup recovery. The effects of reducing phenolic content from approximately 7.0-0.3 mg L-1 in sugarcane syrup on yeast fermentation varied with the scale. An increase in biomolecule productivity was only observed in shake-flasks (11%) and in biomass productivity only in the 2 L bioreactor (12%). Thus, phenolic compounds from sugarcane syrup do not influence β-farnesene production at a large scale under the conditions tested.
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Affiliation(s)
- Luís Carlos Carvalho
- Amyris BioProducts Portugal, Unipessoal, Porto, Portugal
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Porto, Portugal
| | - Ana L S Oliveira
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Porto, Portugal
| | - Erdem Carsanba
- Amyris BioProducts Portugal, Unipessoal, Porto, Portugal
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Porto, Portugal
| | - Ana Lopes
- Amyris BioProducts Portugal, Unipessoal, Porto, Portugal
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Porto, Portugal
| | - Tânia Leal
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Porto, Portugal
| | - Mónica Ribeiro
- Amyris BioProducts Portugal, Unipessoal, Porto, Portugal
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Porto, Portugal
| | - Sara Fernandes
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Porto, Portugal
| | - Manuela Pintado
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Porto, Portugal
| | - Carla Oliveira
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Porto, Portugal
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Nawaz M, Jiang Y, Xiao Y, Yu H, Wang Z, Hu K, Zhang T, Hu J, Gao MT. Influence of Different Pretreatment Steps on the Ratio of Phenolic Compounds to Saccharides in Soluble Polysaccharides Derived from Rice Straw and Their Effect on Ethanol Fermentation. Appl Biochem Biotechnol 2023:10.1007/s12010-023-04337-9. [PMID: 36701092 DOI: 10.1007/s12010-023-04337-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/10/2023] [Indexed: 01/27/2023]
Abstract
The complex structure of rice straw is such that its bioconversion requires multiple physical and chemical pretreatment steps. In this study, it was found that a large amount of soluble polysaccharides (SPs) are formed during the pretreatment of straw. The yield of NaOH-based SPs (4.8%) was much larger than that of ball-milled SPs (1.5%) and H2SO4-based SPs (1.1%). For all the pretreatments, the ratio of phenolic compounds to saccharides (P/S) for each type of SPs increased upon increasing the concentration of ethanol in the order of 90% > 70% > 50%. The yield of NaOH-based SPs was much higher than that of acid-based and ball-milled SPs. The changes in the 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS), ferric reducing antioxidant power assay (FRAP), and 2,2-diphenyl-1-picrylhydrazyl (DPPH) of SPs follow the same rule, i.e., the higher the P/S ratio, the higher the antioxidant values of the SPs. The flow cytometry and laser scanning microscopy results show that the P/S ratio can significantly influence the effect of SPs on microbial growth and cell membrane permeability. Upon varying the ethanol concentration in the range of 50-90%, the P/S ratio increased from 0.02 to 0.17, resulting in an increase in the promoting effects of the SPs on yeast cell growth. Furthermore, H2O2, NAD+/NADH, and NADP+/NADPH assays indicate that SPs with a high P/S ratio can reduce intracellular H2O2 and change the intracellular redox status.
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Affiliation(s)
- Muhammad Nawaz
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, China
| | - Yipeng Jiang
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, China
| | - Ying Xiao
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, China
| | - Hao Yu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, China
| | - Zikang Wang
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, China
| | - Kun Hu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, China
| | - Tianao Zhang
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, China
| | - Jiajun Hu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, China
| | - Min-Tian Gao
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444, China.
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Jiang Y, Xiao Y, Wang Y, Yu H, Hu K, Wang Z, Zhang TA, Hu J, Gao MT. Effect of the ratio of phenolic compounds to saccharides in soluble polysaccharides on ethanol fermentation. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Nazar M, Xu L, Ullah MW, Moradian JM, Wang Y, Sethupathy S, Iqbal B, Nawaz MZ, Zhu D. Biological delignification of rice straw using laccase from Bacillus ligniniphilus L1 for bioethanol production: A clean approach for agro-biomass utilization. JOURNAL OF CLEANER PRODUCTION 2022; 360:132171. [DOI: 10.1016/j.jclepro.2022.132171] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/23/2024]
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Antibacterial Effect of Phenolic Acids Derived from Rice Straw and in Combination with Antibiotics Against Escherichia coli. Appl Biochem Biotechnol 2022; 194:2931-2945. [PMID: 35298768 DOI: 10.1007/s12010-021-03650-5] [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: 07/01/2021] [Accepted: 09/03/2021] [Indexed: 11/02/2022]
Abstract
Many studies have demonstrated that natural plant extracts have inhibitory effects on microorganisms. The purpose of this study was to investigate the inhibitory effect of phenolic acids from rice straw (PAs) on Escherichia coli and their synergistic effect in combination with antibiotics. PAs can inhibit the growth of E. coli effectively by inducing the formation of H2O2; PA-treated cells had a tenfold greater intracellular H2O2 concentration than the control group. The synergistic effect caused by the interaction of PAs and antibiotics on inhibiting the growth of E. coli was significant. This effect may be caused by a PA-induced change in the permeability of E. coli cell membrane. The treatment with PAs made the extracellular K+ concentration reached 15 mg/L within 30 min, while the K+ concentration in the control group was very low and did not change significantly over time. Similarly to the extracellular K+, the extracellular protein concentration exceeded 150 mg/L in the PA treatment group, while it remained very low in the control group. Due to the increased cell permeability, more antibiotics can enter the cell. Hence, this study may provide a novel method of improving the safe use of antibiotics.
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7
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Tajmirriahi M, Momayez F, Karimi K. The critical impact of rice straw extractives on biogas and bioethanol production. BIORESOURCE TECHNOLOGY 2021; 319:124167. [PMID: 33017776 DOI: 10.1016/j.biortech.2020.124167] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 09/18/2020] [Accepted: 09/19/2020] [Indexed: 06/11/2023]
Abstract
Extractives are nonstructural constituents of lignocellulosic materials available in small portions; however, their influence on the bioconversion processes cannot be disregarded. This study evaluated the effect of various concentrations of rice straw water extractives (RWE) and ethanol extractives (REE) on enzymatic hydrolysis, anaerobic digestion, and simultaneous saccharification and fermentation productivity. By increasing the RWE or REE concentration, the glucose yield did not change after 72 h of enzymatic hydrolysis. The RWE increment enhanced ethanol yield to 95.6%. However, the REE increment decreased ethanol yield to 32.1%. Adding RWE caused a considerable reduction in the accumulated biogas and changed the composition of produced biogas from 74% methane to less than 1%. By increasing the REE concentration, the accumulated biogas increased from 167.9 to 524.4 ml/g VS. According to the gas chromatography-mass spectrometry (GC/MS) results, the most abundant RWE and REE components were 3-hydroxy-Spirost-8-en-11-one and guaiazulene, respectively.
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Affiliation(s)
- Mina Tajmirriahi
- Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Forough Momayez
- Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Keikhosro Karimi
- Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran; Department of Chemical Engineering, Vrije Universiteit Brussel, 1050 Brussels, Belgium.
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8
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Hong Y, Wu YR. Acidolysis as a biorefinery approach to producing advanced bioenergy from macroalgal biomass: A state-of-the-art review. BIORESOURCE TECHNOLOGY 2020; 318:124080. [PMID: 32927316 DOI: 10.1016/j.biortech.2020.124080] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 08/30/2020] [Accepted: 09/01/2020] [Indexed: 06/11/2023]
Abstract
Facing fossil fuels consumption and its accompanying environmental pollution, macroalgae, as a major part of the third-generation (3G) biomass, has great potential for bioenergy development due to its species-abundant, renewable and carbohydrate-rich properties. Diluted acid treatment is one of the most effective approaches to releasing fermentable sugars from macroalgal biomass in a short period, but the optimal conditions need to be explored to maximize the hydrolytic yield for the subsequent microbial conversion. Therefore, this review aims to summarize the latest advances in various acids and other auxiliary methods adopted to increase the hydrolytic efficiency of macroalgae. Following an overview of the strategies of different algal types, methods involved in the bioconversion of biofuels and microbial fuel cells (MFC) from algal hydrolysates are also described. For the 3G biorefinery development, the review further discusses key challenges and trends for future utilizing marine biomass to achieve the large-scale industrial production.
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Affiliation(s)
- Ying Hong
- Department of Biology, Shantou University, Shantou, Guangdong 515063, China
| | - Yi-Rui Wu
- Department of Biology, Shantou University, Shantou, Guangdong 515063, China; Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, Guangdong 515063, China; Institute of Marine Sciences, Shantou University, Shantou, Guangdong 515063, China.
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9
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Wei H, Wang Y, Jin Z, Yang F, Hu J, Gao MT. Utilization of straw-based phenolic acids as a biofugicide for a green agricultural production. J Biosci Bioeng 2020; 131:53-60. [PMID: 33082081 DOI: 10.1016/j.jbiosc.2020.09.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 09/03/2020] [Accepted: 09/08/2020] [Indexed: 12/12/2022]
Abstract
Phenolic compounds inhibit phytopathogenic fungal infections effectively. In this study, the antifungal effects of rice straw-derived phenolic acids (PAs) against Fusarium oxysporum were investigated. PAs can inhibit hyphal growth and spore germination, and p-coumaric acid (CA) is the main antifungal substance in PAs. PAs could induce the formation of hydrogen peroxide and increase the relative conductivity and extracellular K+ concentration. Observations using Scanning Electron Microscopy, Laser Scanning Confocal Microscopy and Transmission Electron Microscopy revealed that PAs could damage membrane permeability, which caused cytoplasm leakage. This phenomenon was verified by conductivity and the release of extracellular K+. The chlorophyll fluorescence maps of tomato leaves suggested that F. oxysporum damaged the tomato' photosynthetic system and that PAs reduced the area infected, thereby alleviating the damage. Moreover, PAs could decrease the disease incidence of tomato fruit. The results confirmed the feasibility of using PAs as a biofungicide and provide a way to increase the value of rice straw.
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Affiliation(s)
- Huanran Wei
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Yazhu Wang
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Zheng Jin
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Fan Yang
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Jiajun Hu
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Min-Tian Gao
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China.
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Wang YZ, Yang J, Wei H, Hou R, Shi J, Jin Z, Yang F, Hu J, Gao MT. Reduction of Fermentation-Associated Stresses by Straw-Based Soluble Saccharides for Enhancing Ethanol Production. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:5863-5872. [PMID: 32375483 DOI: 10.1021/acs.jafc.0c00883] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this study, the effect of soluble polysaccharides (SPs) derived from agricultural waste, rice straw, on fermentation-associated stresses (temperature and concentrations of glucose and ethanol) was investigated to achieve high-performance ethanol production. The increase in temperature and concentrations of glucose and ethanol significantly inhibited Saccharomyces cerevisiae growth and lowered ethanol fermentation efficiency. Flow cytometric assays indicated that SPs could alleviate membrane permeability damage caused by fermentation-associated stresses. Atomic force microscopy and transmission electron microscopy revealed that fermentation-associated stresses induced cell surface shrinkage, causing a decrease in the cell size, whereas SPs stimulated the formation of extracellular matrices (EMs), which made the cell surface smooth and the cell morphology regular. Cells with EMs induced by SPs could efficiently produce ethanol under severe stresses. As a result, the titer of ethanol in the fermentation with SPs was 1.40-fold (from 26.40 to 36.98 g/L) higher than that in the fermentation without SPs, suggesting the stress-alleviating effect of SPs on ethanol production.
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Affiliation(s)
- Ya Zhu Wang
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Ji Yang
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Huanran Wei
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Rongrong Hou
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Jie Shi
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Zheng Jin
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Fan Yang
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Jiajun Hu
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Min-Tian Gao
- Shanghai Key Laboratory of Bio-energy Crops, School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
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Hou J, Tang J, Chen J, Zhang Q. Quantitative Structure-Toxicity Relationship analysis of combined toxic effects of lignocellulose-derived inhibitors on bioethanol production. BIORESOURCE TECHNOLOGY 2019; 289:121724. [PMID: 31271911 DOI: 10.1016/j.biortech.2019.121724] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/26/2019] [Accepted: 06/28/2019] [Indexed: 06/09/2023]
Abstract
This study performed a Quantitative Structure-Toxicity Relationship (QSTR) model to evaluate the combined toxicity of lignocellulose-derived inhibitors on bioethanol production. Compared with all the control groups, the combined systems exhibited lower conductivity values, higher oxidation-reduction potential values, as well as maximum inhibition rates. These results indicated that the presence of combined inhibitors had a negative effect on the bioethanol fermentation process. Meanwhile, QSTR model was excellent for evaluating the combined toxic effects at lower ferulic acid concentration (([1:4] × IC50)) and (([1:1] × IC50)), due to higher R2 values (0.994 and 0.762), lower P values (0.000 and 0.023) and relative error values (less than 30%). The obtained results also showed that the combined toxic effects of ferulic acid and representative lignocellulose-derived inhibitors were relevant to different molecular descriptors. Meanwhile, the interactions of combined inhibitors were weaker when ferulic acid was at low concentration ([1:4] × IC50).
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Affiliation(s)
- Jinju Hou
- Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, 200241 Shanghai, China
| | - Jiawen Tang
- Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, 200241 Shanghai, China; Institute of Eco-Chongming (IEC), 3663 N. Zhongshan Rd., Shanghai 200062, China
| | - Jinhuan Chen
- Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, 200241 Shanghai, China; Institute of Eco-Chongming (IEC), 3663 N. Zhongshan Rd., Shanghai 200062, China
| | - Qiuzhuo Zhang
- Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, 200241 Shanghai, China; Institute of Eco-Chongming (IEC), 3663 N. Zhongshan Rd., Shanghai 200062, China.
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12
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Kowalczyk JE, Peng M, Pawlowski M, Lipzen A, Ng V, Singan V, Wang M, Grigoriev IV, Mäkelä MR. The White-Rot Basidiomycete Dichomitus squalens Shows Highly Specific Transcriptional Response to Lignocellulose-Related Aromatic Compounds. Front Bioeng Biotechnol 2019; 7:229. [PMID: 31616664 PMCID: PMC6763618 DOI: 10.3389/fbioe.2019.00229] [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: 06/27/2019] [Accepted: 09/05/2019] [Indexed: 11/13/2022] Open
Abstract
Lignocellulosic plant biomass is an important feedstock for bio-based economy. In particular, it is an abundant renewable source of aromatic compounds, which are present as part of lignin, as side-groups of xylan and pectin, and in other forms, such as tannins. As filamentous fungi are the main organisms that modify and degrade lignocellulose, they have developed a versatile metabolism to convert the aromatic compounds that are toxic at relatively low concentrations to less toxic ones. During this process, fungi form metabolites some of which represent high-value platform chemicals or important chemical building blocks, such as benzoic, vanillic, and protocatechuic acid. Especially basidiomycete white-rot fungi with unique ability to degrade the recalcitrant lignin polymer are expected to perform highly efficient enzymatic conversions of aromatic compounds, thus having huge potential for biotechnological exploitation. However, the aromatic metabolism of basidiomycete fungi is poorly studied and knowledge on them is based on the combined results of studies in variety of species, leaving the overall picture in each organism unclear. Dichomitus squalens is an efficiently wood-degrading white-rot basidiomycete that produces a diverse set of extracellular enzymes targeted for lignocellulose degradation, including oxidative enzymes that act on lignin. Our recent study showed that several intra- and extracellular aromatic compounds were produced when D. squalens was cultivated on spruce wood, indicating also versatile aromatic metabolic abilities for this species. In order to provide the first molecular level systematic insight into the conversion of plant biomass derived aromatic compounds by basidiomycete fungi, we analyzed the transcriptomes of D. squalens when grown with 10 different lignocellulose-related aromatic monomers. Significant differences for example with respect to the expression of lignocellulose degradation related genes, but also putative genes encoding transporters and catabolic pathway genes were observed between the cultivations supplemented with the different aromatic compounds. The results demonstrate that the transcriptional response of D. squalens is highly dependent on the specific aromatic compounds present suggesting that instead of a common regulatory system, fine-tuned regulation is needed for aromatic metabolism.
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Affiliation(s)
| | - Mao Peng
- Fungal Physiology, Westerdijk Fungal Biodiversity Institute and Fungal Molecular Physiology, Utrecht University, Utrecht, Netherlands
| | - Megan Pawlowski
- U.S. Department of Energy Joint Genome Institute, Walnut Creek, CA, United States
| | - Anna Lipzen
- U.S. Department of Energy Joint Genome Institute, Walnut Creek, CA, United States
| | - Vivian Ng
- U.S. Department of Energy Joint Genome Institute, Walnut Creek, CA, United States
| | - Vasanth Singan
- U.S. Department of Energy Joint Genome Institute, Walnut Creek, CA, United States
| | - Mei Wang
- U.S. Department of Energy Joint Genome Institute, Walnut Creek, CA, United States
| | - Igor V Grigoriev
- U.S. Department of Energy Joint Genome Institute, Walnut Creek, CA, United States
| | - Miia R Mäkelä
- Department of Microbiology, University of Helsinki, Helsinki, Finland
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Xu Z, Wang T, Zhang S. Extracellular secretion of feruloyl esterase derived from Lactobacillus crispatus in Escherichia coli and its application for ferulic acid production. BIORESOURCE TECHNOLOGY 2019; 288:121526. [PMID: 31129518 DOI: 10.1016/j.biortech.2019.121526] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Revised: 05/18/2019] [Accepted: 05/20/2019] [Indexed: 06/09/2023]
Abstract
A feruloyl esterase producing strain was isolated and identified as Lactobacillus crispatus S524. Its putative feruloyl esterase was heterogeneously expressed in Escherichia coli BL21 (DE3). Interestingly, the feruloyl esterase (FaeLcr) could be secreted into the culture medium with a relative high purity of 201.7 mg/L. FaeLcr was purified from the cell-free culture supernatant and appeared as a single protein band with the molecular mass of 28 kDa by SDS-PAGE. The optimal temperature and pH were determined as 65 °C and 7.0, and it showed prominent thermo-stability and alkali-stability. Furthermore, the purified FarLcr could release a maximal amount of 199 µg ferulic acid from 0.2 g de-starched wheat bran. Meanwhile, when cultured this recombinant E. coli strain in medium supplemented with 2 g de-starched wheat bran, 1.86 mg ferulic acid was also detected. These results suggested that the recombinant strain has a great potential application in feruloyl esterase and ferulic acid production.
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Affiliation(s)
- Zhenshang Xu
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, PR China; Shandong Provincial Key Laboratory of Microbial Engineering, Department of Bioengineering, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, PR China
| | - Ting Wang
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, PR China; Shandong Provincial Key Laboratory of Microbial Engineering, Department of Bioengineering, Qilu University of Technology, Shandong Academy of Science, Jinan 250353, PR China
| | - Susu Zhang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, PR China.
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Wang X, Cui S, Hu J, Ma X, Zhang TA, Tsang YF, Li J, Gao MT. Saccharides in straw hydrolysate decrease cell membrane damage by phenolics by inducing the formation of extracellular matrix in yeast. Carbohydr Polym 2019; 219:414-422. [DOI: 10.1016/j.carbpol.2019.05.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 05/08/2019] [Accepted: 05/08/2019] [Indexed: 12/22/2022]
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15
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Kumar V, Patel SKS, Gupta RK, Otari SV, Gao H, Lee J, Zhang L. Enhanced Saccharification and Fermentation of Rice Straw by Reducing the Concentration of Phenolic Compounds Using an Immobilized Enzyme Cocktail. Biotechnol J 2019; 14:e1800468. [DOI: 10.1002/biot.201800468] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 02/28/2019] [Indexed: 12/23/2022]
Affiliation(s)
- Virendra Kumar
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, College of Life Sciences, Gutian Edible Fungi Research InstituteFujian Agriculture and Forestry University Fuzhou Fujian Province 350002 P. R. China
- Department of Chemical EngineeringKonkuk UniversitySeoul 05029 South Korea
| | - Sanjay K. S. Patel
- Department of Chemical EngineeringKonkuk UniversitySeoul 05029 South Korea
| | - Rahul K. Gupta
- Department of Chemical EngineeringKonkuk UniversitySeoul 05029 South Korea
| | - Sachin V. Otari
- Department of Chemical EngineeringKonkuk UniversitySeoul 05029 South Korea
| | - Hui Gao
- Department of Chemical EngineeringKonkuk UniversitySeoul 05029 South Korea
| | - Jung‐Kul Lee
- Department of Chemical EngineeringKonkuk UniversitySeoul 05029 South Korea
| | - Liaoyuan Zhang
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, College of Life Sciences, Gutian Edible Fungi Research InstituteFujian Agriculture and Forestry University Fuzhou Fujian Province 350002 P. R. China
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Extraction of Flavonoids from the Saccharification of Rice Straw Is an Integrated Process for Straw Utilization. Appl Biochem Biotechnol 2019; 189:249-261. [DOI: 10.1007/s12010-019-03002-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Accepted: 03/27/2019] [Indexed: 10/27/2022]
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17
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Hacısalihoğlu B, Holyavkin C, Topaloğlu A, Kısakesen Hİ, Çakar ZP. Genomic and transcriptomic analysis of a coniferyl aldehyde-resistant Saccharomyces cerevisiae strain obtained by evolutionary engineering. FEMS Yeast Res 2019; 19:5369625. [DOI: 10.1093/femsyr/foz021] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 03/03/2019] [Indexed: 12/19/2022] Open
Abstract
ABSTRACT
Phenolic inhibitors in lignocellulosic hydrolysates interfere with the performance of fermenting microorganisms. Among these, coniferyl aldehyde is one of the most toxic inhibitors. In this study, genetically stable Saccharomyces cerevisiae mutants with high coniferyl aldehyde resistance were successfully obtained for the first time by using an evolutionary engineering strategy, based on the systematic application of increasing coniferyl aldehyde stress in batch cultures. Among the selected coniferyl aldehyde-resistant mutants, the highly resistant strain called BH13 was also cross-resistant to other phenolic inhibitors, vanillin, ferulic acid and 4-hydroxybenzaldehyde. In the presence of 1.2 mM coniferyl aldehyde stress, BH13 had a significantly reduced lag phase, which was less than 3 h and only about 25% of that of the reference strain and converted coniferyl aldehyde faster. Additionally, there was no reduction in its growth rate, either. Comparative transcriptomic analysis of a highly coniferyl aldehyde-resistant mutant revealed upregulation of the genes involved in energy pathways, response to oxidative stress and oxidoreductase activity in the mutant strain BH13, already under non-stress conditions. Transcripts associated with pleiotropic drug resistance were also identified as upregulated. Genome re-sequencing data generally supported transcriptomic results and identified gene targets that may have a potential role in coniferyl aldehyde resistance.
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Affiliation(s)
- Burcu Hacısalihoğlu
- Department of Molecular Biology and Genetics, Faculty of Science & Letters, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
- Dr. Orhan Öcalgiray Molecular Biology, Biotechnology and Genetics Research Center (İTÜ-MOBGAM), Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
- Department of Molecular Biology and Genetics, Faculty of Science, Erzurum Technical University, Erzurum, 25050, Turkey
| | - Can Holyavkin
- Department of Molecular Biology and Genetics, Faculty of Science & Letters, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
- Dr. Orhan Öcalgiray Molecular Biology, Biotechnology and Genetics Research Center (İTÜ-MOBGAM), Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
| | - Alican Topaloğlu
- Department of Molecular Biology and Genetics, Faculty of Science & Letters, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
- Dr. Orhan Öcalgiray Molecular Biology, Biotechnology and Genetics Research Center (İTÜ-MOBGAM), Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
| | - Halil İbrahim Kısakesen
- Department of Molecular Biology and Genetics, Faculty of Science & Letters, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
- Dr. Orhan Öcalgiray Molecular Biology, Biotechnology and Genetics Research Center (İTÜ-MOBGAM), Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
| | - Zeynep Petek Çakar
- Department of Molecular Biology and Genetics, Faculty of Science & Letters, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
- Dr. Orhan Öcalgiray Molecular Biology, Biotechnology and Genetics Research Center (İTÜ-MOBGAM), Istanbul Technical University, Maslak, Istanbul, 34469, Turkey
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18
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Wang S, Sun X, Yuan Q. Strategies for enhancing microbial tolerance to inhibitors for biofuel production: A review. BIORESOURCE TECHNOLOGY 2018; 258:302-309. [PMID: 29567023 DOI: 10.1016/j.biortech.2018.03.064] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 03/07/2018] [Accepted: 03/09/2018] [Indexed: 05/05/2023]
Abstract
Using lignocellulosic biomass for the production of renewable biofuel provides a sustainable and promising solution to the crisis of energy and environment. However, the processes of biomass pretreatment and biofuel fermentation bring a variety of inhibitors to microbial strains. These inhibitors repress microbial growth, decrease biofuel yields and increase fermentation costs. The production of biofuels from renewable lignocellulosic biomass relies on the development of tolerant and robust microbial strains. In recent years, the advancement of tolerance engineering and evolutionary engineering provides powerful platform for obtaining host strains with desired tolerance for further metabolic engineering of biofuel pathways. In this review, we summarized the inhibitors derived from biomass pretreatment and biofuel fermentation, the mechanisms of inhibitor toxicity, and the strategies for enhancing microbial tolerance.
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Affiliation(s)
- Shizeng Wang
- State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, PR China
| | - Xinxiao Sun
- State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, PR China
| | - Qipeng Yuan
- State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, PR China.
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Chen X, Wang X, Xue Y, Zhang TA, Li Y, Hu J, Tsang YF, Zhang H, Gao MT. Influence of rice straw-derived dissolved organic matter on lactic acid fermentation by Rhizopus oryzae. J Biosci Bioeng 2018; 125:703-709. [DOI: 10.1016/j.jbiosc.2018.01.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 12/20/2017] [Accepted: 01/05/2018] [Indexed: 11/29/2022]
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Tapping the Bioactivity Potential of Residual Stream from Its Pretreatments May Be a Green Strategy for Low-Cost Bioconversion of Rice Straw. Appl Biochem Biotechnol 2018; 186:507-524. [PMID: 29658061 PMCID: PMC6209036 DOI: 10.1007/s12010-018-2751-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Accepted: 03/26/2018] [Indexed: 01/22/2023]
Abstract
In this study, it was found that the residual stream from pretreatments of rice straw exhibited high antioxidant activity. Assays based on the Folin-Ciocalteu colorimetric method confirmed that the residual stream contained large amounts of phenolic compounds. Three antioxidant assays were employed to evaluate the bioactivity of the residual stream. Strong linear correlations existed among the release of phenolic compounds, saccharification efficiency, and antioxidant activity. The alkaline pretreatment provided a much greater release of phenolic compounds, especially phenolic acids, compared to the acid pretreatment, and consequently, it had stronger linear correlations than the acid pretreatment. Antibacterial experiments demonstrated the ability of the phenolic compounds in the residual stream to inhibit the growth of microorganisms, indicating the potential of these compounds as antimicrobial agents. To discuss the possibility of the co-production of antimicrobial agents and biofuels/biochemicals, both acid and alkaline pretreatments were optimized using response surface methodology. Under the optimal conditions, 285.7 g glucose could be produced from 1 kg rice straw with the co-production of 3.84 g FA and 6.98 g p-CA after alkaline pretreatment. These results show that the recovery of phenolic compounds from the residual stream could be a green strategy for the low-cost bioconversion of rice straw.
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