Solid state fermentation for production of microbial cellulases: Recent advances and improvement strategies.
01 May 2016-International Journal of Biological Macromolecules (Int J Biol Macromol)-Vol. 86, pp 656-669
TL;DR: The critical analysis of recent literature covering production of cellulase in solid state fermentation using advance technologies such as consolidated bioprocessing, metabolic engineering and strain improvement, and circumscribes the strategies to improve the enzyme yield are summarized.
About: This article is published in International Journal of Biological Macromolecules.The article was published on 2016-05-01. It has received 179 citations till now. The article focuses on the topics: Solid-state fermentation & Cellulase.
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TL;DR: The most commonly used technologies for the treatment and valorization of the organic fraction of municipal solid waste (MSW) are composting and anaerobic digestion (AD) as discussed by the authors.
752 citations
TL;DR: The present review gives an insight of using microbial xylanases as an “Emerging Green Tool” along with its current status and future prospective.
Abstract: Xylan is the second most abundant naturally occurring renewable polysaccharide available on earth. It is a complex heteropolysaccharide consisting of different monosaccharides such as l-arabinose, d-galactose, d-mannoses and organic acids such as acetic acid, ferulic acid, glucuronic acid interwoven together with help of glycosidic and ester bonds. The breakdown of xylan is restricted due to its heterogeneous nature and it can be overcome by xylanases which are capable of cleaving the heterogeneous β-1,4-glycoside linkage. Xylanases are abundantly present in nature (e.g., molluscs, insects and microorganisms) and several microorganisms such as bacteria, fungi, yeast, and algae are used extensively for its production. Microbial xylanases show varying substrate specificities and biochemical properties which makes it suitable for various applications in industrial and biotechnological sectors. The suitability of xylanases for its application in food and feed, paper and pulp, textile, pharmaceuticals, and lignocellulosic biorefinery has led to an increase in demand of xylanases globally. The present review gives an insight of using microbial xylanases as an “Emerging Green Tool” along with its current status and future prospective.
204 citations
TL;DR: An overview of the various possibilities that can be exploited for biofuel production is provided and recommendations for increasing the production efficiency with a view to improving the overall yield and lowering the production costs are made.
Abstract: Since the Kyoto protocol, the EU renewable energy policy has been the driving force in research and development of the production and use of biofuels. Therefore, the utilization of biofuels and the scientific research to widen the scope of their commercialization are being increasingly promoted. In this context, we present here an overview of the technological developments that have occurred in the production of different biofuels and their resources with a focus on the lignocellulosic biomass and biofuels derived from it. In the recent years, many technologies have evolved enabling the production of different liquid biofuels from lignocellulosic biomass. Bioethanol production using microbial fermentation, and production of bio-oil using fast pyrolysis process of biomass are some of the most widely researched and promising technologies. The first production plants based on these techniques are already operational. Bioethanol production from lignocellulosic biomass promises a good fuel yield under laboratory scale. However, there are several challenges that need to be tackled before the production process can be commercialized. We provide here an overview of the various possibilities that can be exploited for biofuel production and make recommendations for increasing the production efficiency with a view to improving the overall yield and lowering the production costs.
181 citations
TL;DR: This review has summarized major efforts to enhance BC production in order to make it a cost-effective biopolymer and exploration of novel and efficient BC producing microbial strains provides impressive boost to the BC production processes.
164 citations
TL;DR: In this article, a review of the management of solid wastes using Solid State Fermentation (SSF), with regard to its current application, advantages and challenges, downstream processing in SSF, economic viewpoint, and future perspectives is presented.
Abstract: The abundance of organic solid waste throughout the world has become a common issue that needs complete management at every level. Also, the scarcity of fuel and the competition between food and substance as an alternative to a petroleum-based product has become a major problem that needs to be properly handled. An urge to find renewable substances for sustainable development results in a strategy to valorize organic solid waste using solid state fermentation (SSF) and to manage the issue of solid wastes in a green approach. This paper reviews management of solid wastes using SSF, with regard to its current application, advantages and challenges, downstream processing in SSF, economic viewpoint, and future perspectives.
160 citations
Cites background from "Solid state fermentation for produc..."
...These wastes are mainly composed of cellulose (35%–50%), hemicellulose (25%–30%), and lignin (25%–30%) [41]....
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References
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01 Jan 1994TL;DR: Solid-state fermentation has emerged as a potential technology for the production of microbial products such as feed, fuel, food, industrial chemicals and pharmaceutical products and with continuity in current trends, SSF technology would be well developed at par with submerged fermentation technology in times to come.
Abstract: Solid-state fermentation has emerged as a potential technology for the production of microbial products such as feed, fuel, food, industrial chemicals and pharmaceutical products. Its application in bioprocesses such as bioleaching, biobeneficiation, bioremediation, biopulping, etc. has offered several advantages. Utilisation of agro-industrial residues as substrates in SSF processes provides an alternative avenue and value-addition to these otherwise under- or non-utilised residues. Today with better understanding of biochemical engineering aspects, particularly on mathematical modelling and design of bioreactors (fermenters), it is possible to scale up SSF processes and some designs have been developed for commercialisation. It is hoped that with continuity in current trends, SSF technology would be well developed at par with submerged fermentation technology in times to come.
1,431 citations
TL;DR: This review focuses on inhibitors from lignocellulosic feedstocks and how conditioning of slurries and hydrolysates can be used to alleviate inhibition problems.
Abstract: Bioconversion of lignocellulose by microbial fermentation is typically preceded by an acidic thermochemical pretreatment step designed to facilitate enzymatic hydrolysis of cellulose. Substances formed during the pretreatment of the lignocellulosic feedstock inhibit enzymatic hydrolysis as well as microbial fermentation steps. This review focuses on inhibitors from lignocellulosic feedstocks and how conditioning of slurries and hydrolysates can be used to alleviate inhibition problems. Novel developments in the area include chemical in-situ detoxification by using reducing agents, and methods that improve the performance of both enzymatic and microbial biocatalysts.
1,180 citations
TL;DR: A review of the major steps involved in cellulosic-based bioethanol processes and potential issues challenging these operations is provided in this paper, where possible solutions and recoveries that could improve bioprocessing are also addressed.
1,172 citations
TL;DR: SSF processes offer potential advantages in bioremediation and biological detoxification of hazardous and toxic compounds and appear to be a promising one for the production of value-added ‘low volume-high cost’ products such as biopharmaceuticals.
1,059 citations
TL;DR: Recent advances in lignocellulosic biomass processing and analysis from aBiorefining perspective are presented and existing industrial biomass processing applications are discussed and examined within a biorefinery context.
772 citations