Comparative view on microbial consumption of agro-based lignocellulosic waste biomass in sustainable production of cellulases

Verma, Nitin; Kumar, Vivek; Bansal, M. C.

doi:10.1007/s13399-020-00617-0

Cited by 11 publications

(5 citation statements)

References 41 publications

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“…However, the biodegradability of lignocellulosic biomass depends on the particular composition of its organic components: cellulose (9%-80%), hemicellulose (10%-50%), and lignin (5%-35%) [5,6]. Hence, to efficiently process lignocellulosic materials, a hydrolysis step is usually needed.…”

Section: Introductionmentioning

confidence: 99%

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Brewer’s spent grain biotransformation to produce lignocellulolytic enzymes and polyhydroxyalkanoates in a two-stage valorization scheme

Llimós-Turet

Martínez-Avila

Marti

et al. 2020

Biomass Conv. Bioref.

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Lignocellulolytic enzymes from low-cost sources are gaining attention as a tool to reduce production costs. Such enzymes can be obtained sustainably by diverse fungal strains via solid-state fermentation (SSF) of lignocellulosic-derived residues as substrates. Besides, these enzymes allow hydrolyzing the same residue, releasing fermentable sugars that can be transformed into valueadded products. This study shows a two-stage valorization approach for the lignocellulosic leftover brewer's spent grain (BSG): first, by producing lignocellulolytic enzymes through the SSF of BSG using three fungal strains and, second, by using the selfproduced enzymes to hydrolyze the same BSG and obtaining sugar-rich hydrolysates that serve as an alternative carbon source for polyhydroxyalkanoates (PHA) production. From the evaluated set, Aspergillus niger and Thermoascus aurantiacus produced the highest xylanase activities compared with Trichoderma reesei (268 ± 24, 241 ± 10, and 150 ± 24 U per gram of dry BSG, respectively). Also, A. niger extracts resulted in the most effective for releasing sugars from BSG, obtaining up to 0.56 g per gram of dry BSG after 24 h without any pretreatment needed. Thus, the sugar-rich hydrolysate obtained with A. niger was used as a source for producing PHA by using two bacterial strains, namely, Burkholderia cepacia and Cupriavidus necator. Maximum PHA yield was achieved by using C. necator after 48 h with 9.0 ± 0.44 mg PHA•g −1 dry BSG. These results show the significant potential of BSG as raw material for obtaining value-added bioproducts and the importance of multiple valorization schemes to improve the feasibility of similar residue-based systems.

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Section: Introductionmentioning

confidence: 99%

“…In the hydrolysis process, enzymes act as catalysts accelerating various reaction steps. However, differently than their chemical counterparts, enzymatic processes tend to work under mild conditions making them more attractive from diverse points of view [6,8].…”

Section: Introductionmentioning

confidence: 99%

Brewer’s spent grain biotransformation to produce lignocellulolytic enzymes and polyhydroxyalkanoates in a two-stage valorization scheme

Llimós-Turet

Martínez-Avila

Marti

et al. 2020

Biomass Conv. Bioref.

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“…Enzyme production can be improved in order to generate a suitable technology for economical processes. Different strategies have been implemented based in low-cost residues for cellulase production identifying major parameters affecting enzyme production [25][26][27]. The nine strains tested positive for cellulase production presented both halophilic and alkalotolerant properties.…”

Section: Discussionmentioning

confidence: 99%

Cellulase Production by Microorganisms Isolated From Laguna Blanca, Potosí-Bolivia

Camacho¹,

Soto²,

Guzmán³

et al. 2021

Rev. Bol. Quim.

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Las cepas bacterianas aisladas de muestras de agua recolectadas de Laguna Blanca, Potosí-Bolivia, y depositadas en el Centro de Biotecnología, Cochabamba-Bolivia, fueron sometidas a estudios de producción de celulasas. Entre 71 cepas, 32 se seleccionaron como positivas en medio líquido utilizando papel de filtro como única fuente de carbono. Nueve cepas reportaron mayor actividad de celulasas y se evaluó el efecto de la concentración de NaCl y el pH sobre el crecimiento de microorganismos. Siete cepas se identificaron como halófilas mientras que 2 fueron halotolerantes. Según el valor de pH del medio de cultivo, 5 cepas fueron neutrófilas y 4 alcalotolerantes. Las cepas codificadas como LB-4 y LB-8 fueron seleccionadas como mejores productoras de celulasas. Además, la producción de celulasas utilizando productos forestales y residuos agroindustriales fue positiva para diferentes tipos de papel y madera de pino, sin embargo, se detectaron valores de actividad más altos con cáscara de plátano y bagazo de caña de azúcar. Se seleccionó la cepa LB-8 como la mejor productora de celulasas bajo las condiciones utilizadas en este estudio con una actividad enzimática de 2.774 U/ml. Los análisis filogenéticos mostraron una similitud de secuencia del 99,99 % entre la cepa LB-8 y Bacillus pumilus.

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“…They employed a robust optimization approach to maximize profit, minimize the resulting environmental impacts, and maximize job opportunities and also verified the performance of the model by a case study performed in Iran. N. Verma et al [50] compared the potential ability of untreated and alkali-treated wheat straw, bagasse, and groundnut shell waste in cellulase production and showed that compared with the untreated materials, alkali-treated raw materials were significantly more effective for cellulase production. S. Vakalis et al [51] proposed a method which combines co-combusting conventional fuels with biocoals from agro-waste for the purpose of reducing carbon emissions from coal plants and proved that when more than 40% of fuel blends consisted of biocoal, the use of lignite coal led to optimal results.…”

Section: Research Topic Evolution Analysismentioning

confidence: 99%

Research Hotspots and Evolution Trends of Carbon Neutrality—Visual Analysis of Bibliometrics Based on CiteSpace

et al. 2022

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Climate change is one of the most urgent challenges facing the world. All countries should take joint actions to achieve the goal of carbon neutrality, which include controlling global warming to within a 1.5 °C temperature rise, to mitigate the extreme harm caused by climate change. However, ways in which to achieve economically and environmentally sustainable carbon neutrality are yet to be established. Carbon neutrality appears frequently in international policy and the scientific literature, but there is little detailed literature. It is necessary to conduct an in-depth analysis of the development context of its research. This paper analyzed the literature on carbon neutrality using bibliometric methods. A total of 1383 research papers were collected from the “Web of Science core database” from 1995 to 2021. Descriptive statistical analysis and keyword co-occurrence and literature co-citation network analyses were utilized to sort the research hotspots, and the detected bursts, the top 30 keywords in terms of word frequency, and 12 clusters were selected. It was found that the existing carbon neutrality research literature mainly focuses on carbon neutrality energy transformation, carbon neutrality technology development, carbon neutrality effect evaluation, and carbon neutrality industry examples. The analysis process involved comprehensively reading the key articles and considering the co-citation, burstiness, centrality, and other indicators under clustering; the carbon neutrality research was then divided into three stages, and evolving themes were observed. Based on the burst detection, this paper holds that with the energy structure transformation, energy consumption assessment and carbon neutrality schemes of various industries, carbon dioxide capture technology, and biogas resource utilization, urban carbon neutrality policy will become a research hotspot in the future. This paper helps to provide a reference for scholars’ theoretical research and has important reference value for policymakers to formulate relevant policy measures. It is helpful for enterprises to make strategic decisions and determine the direction of technology, for R&D and investment, and it is of considerable significance to promote the research of carbon neutrality technology.

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Comparative view on microbial consumption of agro-based lignocellulosic waste biomass in sustainable production of cellulases

Cited by 11 publications

References 41 publications

Brewer’s spent grain biotransformation to produce lignocellulolytic enzymes and polyhydroxyalkanoates in a two-stage valorization scheme

Brewer’s spent grain biotransformation to produce lignocellulolytic enzymes and polyhydroxyalkanoates in a two-stage valorization scheme

Cellulase Production by Microorganisms Isolated From Laguna Blanca, Potosí-Bolivia

Research Hotspots and Evolution Trends of Carbon Neutrality—Visual Analysis of Bibliometrics Based on CiteSpace

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