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Efficient lignin biodegradation triggered by alkali-tolerant ligninolytic bacteria through improving lignin solubility in alkaline solution 被引量:1
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作者 Zhaoxian Xu Jie Li +6 位作者 Pingping Li Chenggu Cai Sitong Chen Boning Ding Shuangmei Liu Mianshen Ge Mingjie Jin 《Journal of Bioresources and Bioproducts》 EI CSCD 2023年第4期461-477,共17页
Low lignin solubility in aqueous solution is one of the major bottlenecks for lignin biodegradation and bioconversion.Alkaline solution contributes to improving lignin solubility,whereas most microbes can not survive ... Low lignin solubility in aqueous solution is one of the major bottlenecks for lignin biodegradation and bioconversion.Alkaline solution contributes to improving lignin solubility,whereas most microbes can not survive in alkaline conditions.Herein,lignin dissolution behaviors in different pH solutions were systematically investigated,which indicated that solution pH above 10.5 contributed to high solubility of alkali lignin.To match with alkaline lignin aqueous system,several alkali-tolerant ligninolytic bacteria were isolated,most of which are distinct to previously reported ones.Then,the ligninolytic capabilities of these isolates were assessed in different pH conditions by determining their assimilation on alkali lignin,lignin-derived monomers and dimers,their decolorization capabilities,and their lignin peroxidase activities.Thereafter,the underlying ligninolytic and alkali-tolerant mechanisms of Sutcliffiella sp.NC1,an alkalophilic bacterium,was analyzed on the basis of its genome information.The results not only provide valuable information for lignin biodegradation and lignin valorization,but also expand knowledge on alkali-tolerant bacteria. 展开更多
关键词 Biorefinery lignin valorization lignin biodegradation lignin solubility EXTREMOPHILE Alkali-tolerant bacteria
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Biodegradation of ferulic acid by a newly isolated strain of Cupriavidus sp. B-8 被引量:3
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作者 CHAI Li-yuan ZHANG Huan +4 位作者 YANG Wei-chun ZHU Yong-hua YANG Zhi-hui ZHENG Yu CHEN Yue-hui 《Journal of Central South University》 SCIE EI CAS 2013年第7期1964-1970,共7页
As a major component of lignin and abundantly existing in softwood and hardwood, ferulic acid has been used as a lignin-related compound for lignin biodegradation study. Biodegradation of ferulic acid by Cupriavidus s... As a major component of lignin and abundantly existing in softwood and hardwood, ferulic acid has been used as a lignin-related compound for lignin biodegradation study. Biodegradation of ferulic acid by Cupriavidus sp. B-8, a newly isolated strain, was studied. This strain is able to utilize a wide range of lignin-related aromatic compounds as the sole carbon and energy source, including guaiacol, veratric acid, vanillic acid, cinnamic acid, p-coumaric acid, ferulic acid, and sinapic acid. In addition, the effects of different concentrations of ferulic acid on growth of Cupriavidus sp. B-8 were studied. The growth of Cupriavidus sp. B-8 is better under the condition of lower concentration. High-performance liquid chromatography (HPLC) analysis reveals that above 95% of ferulic acid is degraded within 12 h by Cupriavidus sp. B-8. Based on identification of biodegradation intermediates and further metabolites, the biodegradation pathway of ferulic acid by Cupriavidus sp. B-8 was proposed. Ferulic acid is initially converted to 4-vinylguaiacol, and further oxidized to vanillic acid and protocatechuic acid. 展开更多
关键词 Cupriavidus sp. B-8 lignin biodegradation ferulic acid gas chromatography and mass spectrometry
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Optimizing bio-physical conditions and pre-treatment options for breaking lignin barrier of maize stover feed using white rot fungi 被引量:2
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作者 Andrew M. Atuhaire Fred Kabi +2 位作者 Samuel Okello Swidiq Mugerwa Cyprian Ebong 《Animal Nutrition》 SCIE 2016年第4期361-369,共9页
The greatest limitation to utilization of maize stover by ruminants as a feed is the high concentration of lignin, which limits fibre digestibility. However, ruminants can effectively utilize maize stover if its nutri... The greatest limitation to utilization of maize stover by ruminants as a feed is the high concentration of lignin, which limits fibre digestibility. However, ruminants can effectively utilize maize stover if its nutritive value is improved using white rot fungal species. This study was designed to determine optimal biophysical conditions for mycelial growth and select the most ideal fungal species and pre-treatment options for improving nutritive value of maize stover. Four popular edible Pleurotus fungal species(viz.Pleurotus florida,Pleurotus ostreatus, Pleurotus sajor caju and Pleurotus pulmonarius) were subjected to varying temperatures, pH levels, hydrogen peroxide(H_2 O_2) concentration and illumination to establish the extent of mycelial growth rate.Inclusion of H_2 O_2 was used to determine optimal levels for preservation and prevention of contamination from other indigenous microbiota. Effects of pre-treatment options on chemical composition and nutritive value of maize stover were also examined. Mycelial growth rate of Pleurotus species on potato dextrose agar(PDA) varied(P < 0.05) with temperature, pH level and H_2 O_2 concentration following a quadratic trend. Optimal temperature, pH and H_2 O_2 concentration for mycelial growth on PDA were 25 ℃,5 and 0.01 mL/L, respectively. Under the different bio-physical conditions,P. sajor caju had the highest mycelia density and growth rate. Chemical composition of solid-state fermented maize stover differed(P < 0.05) among the Pleurotus species. Maize stover fermented with P. sajor caju had the highest crude protein(CP) of 86.6 g/kg DM, in-vitro dry matter digestibility(IVDMD) of 731 g/kg DM, in-vitro organic matter digestibility(IVOMD) of 670.4 g/kg DM and metabolizable energy(ME) of10.0 MJ/kg DM but with the lowest lignin(sa) of 50 g/kg DM. At 25℃, P. sajor caju had the highest mycelial growth rate on PDA and highest lignin(sa) breakdown in the maize stover substrate. It was, therefore,selected as the most ideal fungal species for improving nutritive value of maize stover. Pre-treatment of maize stover with Lactobacillus plantarum and molasses under anaerobic condition for 7 days before inoculation with P. sajor caju resulted into a substrate with the highest(P< 0.05) CP(96.6 g/kg DM), IVDMD(752.3 g/kg DM), IVOMD(687.2 g/kg DM) and ME(10.2 MJ/kg DM). However, neutral detergent fiber exclusive of residual ash(NDFom) and lignin(sa) fractions decreased(P < 0.05) as a result of subjecting maize stover to pre-treatment with L. plantarum and molasses prior to fermentation with P. sajor caju.Therefore, pre-treatment of maize stover with L. plantarum and molasses for 7 days prior to fermentation with P. sajorcaju for 14 days in darkness at 25℃ offered the greatest potential for breaking the lignin barrier. 展开更多
关键词 Crop residues Lactobacillus plantarum lignin biodegradation Mycelial growth
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