Extremophiles as source of novel bioactive compounds with industrial potential

Neifar, Mohamed; Maktouf, Sameh; Ghorbel, Raoudha; Jaouani, Atef; Chérif, Ameur

doi:10.1002/9781118733103.ch10

Cited by 24 publications

(7 citation statements)

References 130 publications

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“…Fungi from extreme environments are very important from industrial point of view owing to their extremophilic enzymes which posses several special characteristics such as thermotolerance, pH tolerance, and tolerance to other harsh conditions [44]. Amongst the extreme environments, effluent treatment plant represents one such potential niche which could be targeted for fungi with capacity for diverse bioremediation applications, owing to their exposure to high levels of pollutants from industrial effluents.…”

Section: Extremophilic Fungimentioning

confidence: 99%

Diverse Metabolic Capacities of Fungi for Bioremediation

2016

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Bioremediation refers to cost-effective and environment-friendly method for converting the toxic, recalcitrant pollutants into environmentally benign products through the action of various biological treatments. Fungi play a major role in bioremediation owing to their robust morphology and diverse metabolic capacity. The review focuses on different fungal groups from a variety of habitats with their role in bioremediation of different toxic and recalcitrant compounds; persistent organic pollutants, textile dyes, effluents from textile, bleached kraft pulp, leather tanning industries, petroleum, polyaromatic hydrocarbons, pharmaceuticals and personal care products, and pesticides. Bioremediation of toxic organics by fungi is the most sustainable and green route for cleanup of contaminated sites and we discuss the multiple modes employed by fungi for detoxification of different toxic and recalcitrant compounds including prominent fungal enzymes viz., catalases, laccases, peroxidases and cyrochrome P450 monooxygeneses. We have also discussed the recent advances in enzyme engineering and genomics and research being carried out to trace the less understood bioremediation pathways.

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Section: Extremophilic Fungimentioning

confidence: 99%

Diverse Metabolic Capacities of Fungi for Bioremediation

2016

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“…21 Extremophilic microorganisms are widely applied in TWWs treatment due to their ability to survive in such harsh condition which poses a limiting factor for mesophilic microorganisms. 35,36 Plant growth promoting rhizobacteria show also interesting ability to decolorize various textile dyes. 37,38 These bioprocesses can be classified, on the basis of oxygen requirement, into aerobic, anaerobic and anoxic or facultative or a combination of these.…”

Section: Biological Treatmentmentioning

confidence: 99%

Untitled

2019

JTEFT

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Textile dyeing industries are facing problems to meet the green practices standards for safe discharge of wastewater due to its complex nature. TWWs are a complex mixture of salts, acids, heavy metals, organ-chlorine-based pesticides, pigments and dyes. 5,10 TWWs generated from the different wet processes are characterized by high pH, temperature, BOD, COD, detergents, surfactants, suspended and dissolved solids, dispersants, leveling agents, toxic organics, chlorinated compounds, sulphide and formaldehyde, may be added to improve dye adsorption onto the fibers 9 and more details are mentioned in the Figure 1. Such effluents are also characterized by the presence of heavy metals, such as Cr, Zn, Cu and Al due to metal-based complexes dyes. 10,14 The most common textile operates are desizing, bleaching, mercerizing, dyeing and finishing. 15 Characteristics and the amount of TWWs depend to the process, dyeing is the most one which requires large volumes of water not only in the step of adding color to the fibers, in dye bath, but also during the rinsing step. Mercerizing and finishing are also significant generators of TWWs. In addition, equipment, machines and chemicals, 5 such as detergents and stabilizers, alter significantly the nature of TWWs. Another important factor which contributes to the ecotoxicity and the volume of TWWs is that dyeing and finishing processes, especially, require the imput of a wide range of dyestuffs. The Variety of dyes depends to the fiber used. 16 For example, cellulose fiber requires the application of direct, reactive, vat, azo or sulfide dyes. Acid dyes are used essentially for wool and silk. Azo and disperse dyes are applied to the polyester fiber. A large quantity of these dyes is released in the TWWs due to their degree of fixation to fibers. AbstractThe textile wastewaters (TWWs) are one of the major sources of environmental pollution, due to the presence of various recalcitrant dyes. It is estimated that about 300,000 t of synthetic dyes are discharged in TWWs every year worldwide. Thus, untreated or incompletely treated TWWs cause harm to aquatic and terrestrial life. To avoid the negative impacts associated to the discharge of TWWs into the natural ecosystems, effective dye remediation processes are being developed. Current methods of removing dyes from TWWs are generally regarded to be complex, expensive and energy demanding processes. Therefore, bioremediation of TWWs using microbial consortia has appeared as an emerging alternative for textile dyes removal. This chapter provides an updated literature on the application of microbial consortia in the treatment of TWWs, focusing on the mechanisms involved in dye biodegradation and the main interactions established between the consortia members and how they can influence dye removal efficiencies.

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“…For example, the seasonal or intermittent plant productivity of hot desert soils [141] offers an alternative, and largely unexplored, catalogue of thermophilic and/or halophilic and/or alkaliphilic lignocellulose-degrading organisms [132,[142][143][144][145]. Cold-active AcXEs might also become a focus for future biomining projects, given the recent development of strategies for bioconversion of lignocellulosic substrates using psychrophilic CAZymes [146,147].…”

Section: Acxes From Extremophilesmentioning

confidence: 99%

Phylogeny, classification and metagenomic bioprospecting of microbial acetyl xylan esterases

Adesioye

Makhalanyane

Biely

et al. 2016

Enzyme and Microbial Technology

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Highlights• AcXEs occur in several CAZy families, and show promiscuous substrate specificities.• A strong AcXE sequence to specificity link would be a valuable functional predictor.• There is a clear need for novel AcXE enzymes with detailed substrate specificity data.• Functional metagenomics would be the most effective means for identifying new AcXEs.• A lack of suitable substrates limits high throughput metagenomic biomining of AcXEs.

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Extremophiles as source of novel bioactive compounds with industrial potential

Cited by 24 publications

References 130 publications

Diverse Metabolic Capacities of Fungi for Bioremediation

Diverse Metabolic Capacities of Fungi for Bioremediation

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Phylogeny, classification and metagenomic bioprospecting of microbial acetyl xylan esterases

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