A critical review on the environmental application of lipopeptide micelles

Zhu, Zhiwen; Zhang, Baiyu; Cai, Qinhong; Cao, Yiqi; Ling, Jingjing; Lee, Kenneth; Chen, Bing

doi:10.1016/j.biortech.2021.125602

Cited by 29 publications

(5 citation statements)

References 111 publications

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“…The genetic regulation of lipopeptides is governed by the four open reading frames (ORFs) in the srfA operon directing the surfactin synthesis including srfAA , srfAB , srfAC, and srfAD ( Zhu et al, 2021 ). Surfactin is synthesized by a multi-enzyme synthetase complex mainly comprising SrfA, SrfB, and SrfD subunits.…”

Section: Discussionmentioning

confidence: 99%

Genetic Evidences of Biosurfactant Production in Two Bacillus subtilis Strains MB415 and MB418 Isolated From Oil Contaminated Soil

Yasmin

Aslam

Fariq

2022

Front. Bioeng. Biotechnol.

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Biosurfactants are a diverse group of amphiphilic compounds obtained from microbes. In the present study, the genomic analysis of biosurfactant-producing Bacillus subtilis MB415 and MB418 obtained from oil-contaminated soil was performed. Initially, the strains were screened for biosurfactant production by hemolytic assay, emulsification index, and oil displacement. Further FTIR analysis of extracted biosurfactants revealed the presence of lipopeptides. The sequenced genomes of MB415 and MB418 were of 4.2 Mbps with 43% GC content. Among more than 4,500 protein-coding genes, many were involved in virulence, metal/multidrug resistances, flagella assembly, chemotactic response, and aromatic ring hydroxylating dioxygenases. An annotation analysis revealed that both genomes possessed non-ribosomal synthetase gene clusters for the lipopeptide synthetases srf and fen responsible for surfactin and fengycin production. Comparative studies of both genomes highlighted variability in gene operons mainly for surfactin biosynthesis.

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Section: Discussionmentioning

confidence: 99%

Genetic Evidences of Biosurfactant Production in Two Bacillus subtilis Strains MB415 and MB418 Isolated From Oil Contaminated Soil

Yasmin

Aslam

Fariq

2022

Front. Bioeng. Biotechnol.

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“…As the concentration of these molecules in the solution increases, there is a critical value of concentration at which is observed the formation of aggregates known as micelles. This point is called the critical micelle concentration, and above this threshold, when biosurfactants are added, they will interact with each other, forming micelles [ 47 , 48 ]. These micelles can act as carriers of substances or aid in the solubility of insoluble compounds.…”

Section: Additives As Emerging Tools To Enhance Enzymatic Hydrolysismentioning

confidence: 99%

Surfactants, Biosurfactants, and Non-Catalytic Proteins as Key Molecules to Enhance Enzymatic Hydrolysis of Lignocellulosic Biomass

et al. 2022

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Lignocellulosic biomass (LCB) has remained a latent alternative resource to be the main substitute for oil and its derivatives in a biorefinery concept. However, its complex structure and the underdeveloped technologies for its large-scale processing keep it in a state of constant study trying to establish a consolidated process. In intensive processes, enzymes have been shown to be important molecules for the fractionation and conversion of LCB into biofuels and high-value-added molecules. However, operational challenges must be overcome before enzyme technology can be the main resource for obtaining second-generation sugars. The use of additives is shown to be a suitable strategy to improve the saccharification process. This review describes the mechanisms, roles, and effects of using additives, such as surfactants, biosurfactants, and non-catalytic proteins, separately and integrated into the enzymatic hydrolysis process of lignocellulosic biomass. In doing so, it provides a technical background in which operational biomass processing hurdles such as solids and enzymatic loadings, pretreatment burdens, and the unproductive adsorption phenomenon can be addressed.

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“…The acceleration of herding process and enhancement of herding efficiency with increased dosage of a herding agent were verified here. The contribution of temperature to the surface activities of biosurfactants has been explained in detail by Zhu et al (2021). By affecting the mobility of biosurfactant fatty acid tails, their expansion on the liquid surface, and the micellar structures formed in this process, a reduced temperature could lead to increased air-water interfacial tension and a higher critical micellar concentration of biosurfactants (Cao et al, 2022).…”

Section: Bioherder Applications For Marine Oil Spill Responsementioning

confidence: 99%

“…They can reduce the surface tension of water from 72 to 19-43 mN/m and the water/hexadecane interfacial tension from 43 mN/m to 0.02-15 mN m −1 (Kuyukina and Ivshina, 2019). In addition, they have good stability under various environmental conditions, even under high salinities and low temperatures (Table 1) (Zhu et al, 2021). Such properties make their application in the marine environment promising, even in cold-sensitive regions, such as the North Atlantic and Arctic ocean (Cai et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Bioherder Generated by Rhodococcus erythropolis as a Marine Oil Spill Treating Agent

Zhu

Chen

et al. 2022

Front. Microbiol.

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There is an urgent call for contingency planning with effective and eco-friendly oil spill cleanup responses. In situ burning, if properly applied, could greatly mitigate oil in water and minimize the adverse environmental impacts of the spilled oil. Chemical herders have been commonly used along with in situ burning to increase the thickness of spilled oil at sea and facilitate combustion. These chemical surfactant-based agents can be applied to the edges of the oil slick and increase its thickness by reducing the water–oil interfacial tension. Biosurfactants have recently been developed as the next generation of herds with a smaller environmental footprint. In this study, the biosurfactant produced by Rhodococcus erythropolis M25 was evaluated and demonstrated as an effective herding agent. The impact of environmental and operational factors (e.g., temperature, herder dose, spilled oil amount, water salinity, and operation location) on its performance was investigated. A five-factor fractional design was applied to examine the importance of these factors and their impact on herding effectiveness and efficiency. The results of this study showed that higher temperature and a higher dose of herder could result in an increased oil slick thickness changing rate. Differences in water salinity at the same temperature led to the same trend, that is, the herding process effectively goes up with increasing herder–oil ratio (HOR). Further large-scale testing needs to be conducted for evaluating the applicability of the developed bioherder in the field.

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A critical review on the environmental application of lipopeptide micelles

Cited by 29 publications

References 111 publications

Genetic Evidences of Biosurfactant Production in Two Bacillus subtilis Strains MB415 and MB418 Isolated From Oil Contaminated Soil

Genetic Evidences of Biosurfactant Production in Two Bacillus subtilis Strains MB415 and MB418 Isolated From Oil Contaminated Soil

Surfactants, Biosurfactants, and Non-Catalytic Proteins as Key Molecules to Enhance Enzymatic Hydrolysis of Lignocellulosic Biomass

Bioherder Generated by Rhodococcus erythropolis as a Marine Oil Spill Treating Agent

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