Bio-based rhamnolipids production and recovery from waste streams: Status and perspectives

Varjani, Sunita; Rakholiya, Parita; Ng, How Yong; Taherzadeh, Mohammad J.; Ngo, Huu Hao; Chang, Jo Shu; Wong, Jonathan W C; You, Siming; Teixeira, J. A.; Bui, Xuan‐Thanh

doi:10.1016/j.biortech.2020.124213

Cited by 66 publications

(26 citation statements)

References 113 publications

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“…The low-molecular-weight biosurfactants lower the surface and interfacial tensions whereas high-molecular-weight biosurfactants, also recognized as bio emulsifiers, are better at stabilizing oil-in-water emulsions [ 26 – 28 ]. Among all currently recognised biosurfactants, Rhamnolipids, which is one of the glycolipids, has the greatest potential to become the next generation of biosurfactants [ 29 ]. Pseudomonas species is mainly used to produce these important groups of microbial surfactants around the world [ 10 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

A critical review on various feedstocks as sustainable substrates for biosurfactants production: a way towards cleaner production

et al. 2021

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The quest for a chemical surfactant substitute has been fuelled by increased environmental awareness. The benefits that biosurfactants present like biodegradability, and biocompatibility over their chemical and synthetic counterparts has contributed immensely to their popularity and use in various industries such as petrochemicals, mining, metallurgy, agrochemicals, fertilizers, beverages, cosmetics, etc. With the growing demand for biosurfactants, researchers are looking for low-cost waste materials to use them as substrates, which will lower the manufacturing costs while providing waste management services as an add-on benefit. The use of low-cost substrates will significantly reduce the cost of producing biosurfactants. This paper discusses the use of various feedstocks in the production of biosurfactants, which not only reduces the cost of waste treatment but also provides an opportunity to profit from the sale of the biosurfactant. Furthermore, it includes state-of-the-art information about employing municipal solid waste as a sustainable feedstock for biosurfactant production, which has not been simultaneously covered in many published literatures on biosurfactant production from different feedstocks. It also addresses the myriad of other issues associated with the processing of biosurfactants, as well as the methods used to address these issues and perspectives, which will move society towards cleaner production.

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Section: Introductionmentioning

confidence: 99%

A critical review on various feedstocks as sustainable substrates for biosurfactants production: a way towards cleaner production

et al. 2021

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“…Table 1 summarizes the type of biosurfactant as well as the microbes that produce them and their roles in pesticide remediation. Fatty acids, Phospholipids, and Neutral lipids may be formed by a diverse group of microbial species that grow on various substrates, including n-alkanes ( Varjani et al, 2021 ). Thiobacillus thioxidans is a well-known producer of phospholipids and has been reported to reduce sulfur elements from the soil.…”

Section: Biosurfactants: the Next Age Compounds In Pesticide Remediation And Their Typesmentioning

confidence: 99%

Tapping the Role of Microbial Biosurfactants in Pesticide Remediation: An Eco-Friendly Approach for Environmental Sustainability

2021

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Pesticides are used indiscriminately all over the world to protect crops from pests and pathogens. If they are used in excess, they contaminate the soil and water bodies and negatively affect human health and the environment. However, bioremediation is the most viable option to deal with these pollutants, but it has certain limitations. Therefore, harnessing the role of microbial biosurfactants in pesticide remediation is a promising approach. Biosurfactants are the amphiphilic compounds that can help to increase the bioavailability of pesticides, and speeds up the bioremediation process. Biosurfactants lower the surface area and interfacial tension of immiscible fluids and boost the solubility and sorption of hydrophobic pesticide contaminants. They have the property of biodegradability, low toxicity, high selectivity, and broad action spectrum under extreme pH, temperature, and salinity conditions, as well as a low critical micelle concentration (CMC). All these factors can augment the process of pesticide remediation. Application of metagenomic and in-silico tools would help by rapidly characterizing pesticide degrading microorganisms at a taxonomic and functional level. A comprehensive review of the literature shows that the role of biosurfactants in the biological remediation of pesticides has received limited attention. Therefore, this article is intended to provide a detailed overview of the role of various biosurfactants in improving pesticide remediation as well as different methods used for the detection of microbial biosurfactants. Additionally, this article covers the role of advanced metagenomics tools in characterizing the biosurfactant producing pesticide degrading microbes from different environments.

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“…), phospholipids, and polymeric fatty acids (emulsan, liposan, alasan, etc.) are complex structures [28,76,77]. At present, the most favourable biosurfactants are glycolipids, sophorolipids secreted by Candida yeasts, and rhamnolipids produced by Pseudomonas.…”

Section: Biosurfactantsmentioning

confidence: 99%

Exploiting Microbes in the Petroleum Field: Analyzing the Credibility of Microbial Enhanced Oil Recovery (MEOR)

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Crude oil is a major energy source that is exploited globally to achieve economic growth. To meet the growing demands for oil, in an environment of stringent environmental regulations and economic and technical pressure, industries have been required to develop novel oil salvaging techniques. The remaining ~70% of the world’s conventional oil (one-third of the available total petroleum) is trapped in depleted and marginal reservoirs, and could thus be potentially recovered and used. The only means of extracting this oil is via microbial enhanced oil recovery (MEOR). This tertiary oil recovery method employs indigenous microorganisms and their metabolic products to enhance oil mobilization. Although a significant amount of research has been undertaken on MEOR, the absence of convincing evidence has contributed to the petroleum industry’s low interest, as evidenced by the issuance of 400+ patents on MEOR that have not been accepted by this sector. The majority of the world’s MEOR field trials are briefly described in this review. However, the presented research fails to provide valid verification that the microbial system has the potential to address the identified constraints. Rather than promising certainty, MEOR will persist as an unverified concept unless further research and investigations are carried out.

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Bio-based rhamnolipids production and recovery from waste streams: Status and perspectives

Cited by 66 publications

References 113 publications

A critical review on various feedstocks as sustainable substrates for biosurfactants production: a way towards cleaner production

A critical review on various feedstocks as sustainable substrates for biosurfactants production: a way towards cleaner production

Tapping the Role of Microbial Biosurfactants in Pesticide Remediation: An Eco-Friendly Approach for Environmental Sustainability

Exploiting Microbes in the Petroleum Field: Analyzing the Credibility of Microbial Enhanced Oil Recovery (MEOR)

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