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Petracco E, Flourat AL, Belhomme MC, Castex S, Brunissen F, Brunois F, Peru AAM, Allais F, Haudrechy A. Green synthesis of ( R)-3-hydroxy-decanoic acid and analogs from levoglucosenone: a novel access to the fatty acid moiety of rhamnolipids. Front Chem 2024; 12:1362878. [PMID: 38708030 PMCID: PMC11066284 DOI: 10.3389/fchem.2024.1362878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 03/11/2024] [Indexed: 05/07/2024] Open
Abstract
Rhamnolipids (RLs) are highly valuable molecules in the cosmetic, pharmaceutic, and agricultural sectors with outstanding biosurfactant properties. In agriculture, due to their potential to artificially stimulate the natural immune system of crops (also known as elicitation), they could represent a critical substitute to conventional pesticides. However, their current synthesis methods are complex and not aligned with green chemistry principles, posing a challenge for their industrial applications. In addition, their bioproduction is cumbersome with reproducibility issues and expensive downstream processing. This work offers a more straightforward and green access to RLs, crucial to decipher their mechanisms of action and design novel potent and eco-friendly elicitors. To achieve this, we propose an efficient seven-step synthetic pathway toward (R)-3-hydroxyfatty acid chains present in RLs, starting from cellulose-derived levoglucosenone, with Michael addition, Baeyer-Villiger oxidation, Bernet-Vasella reaction, and cross-metathesis homologation as key steps. This method allowed the production of (R)-3-hydroxyfatty acid chains and derivatives with an overall yield ranging from 24% to 36%.
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Affiliation(s)
- Enzo Petracco
- Institut de Chimie Moléculaire de Reims, UMR 7312, SFR Condorcet FR CNRS 3417, Université de Reims Champagne Ardenne, Reims, France
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, Pomacle, France
| | - Amandine L. Flourat
- Institut de Chimie Moléculaire de Reims, UMR 7312, SFR Condorcet FR CNRS 3417, Université de Reims Champagne Ardenne, Reims, France
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, Pomacle, France
| | - Marie-Charlotte Belhomme
- Institut de Chimie Moléculaire de Reims, UMR 7312, SFR Condorcet FR CNRS 3417, Université de Reims Champagne Ardenne, Reims, France
| | - Stéphanie Castex
- Institut de Chimie Moléculaire de Reims, UMR 7312, SFR Condorcet FR CNRS 3417, Université de Reims Champagne Ardenne, Reims, France
| | - Fanny Brunissen
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, Pomacle, France
| | - Fanny Brunois
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, Pomacle, France
| | - Aurélien A. M. Peru
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, Pomacle, France
| | - Florent Allais
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, Pomacle, France
| | - Arnaud Haudrechy
- Institut de Chimie Moléculaire de Reims, UMR 7312, SFR Condorcet FR CNRS 3417, Université de Reims Champagne Ardenne, Reims, France
- URD Agro-Biotechnologies Industrielles (ABI), CEBB, AgroParisTech, Pomacle, France
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2
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Palos Pacheco R, Kegel LL, Pemberton JE. Interfacial and Solution Aggregation Behavior of a Series of Bioinspired Rhamnolipid Congeners Rha-C14-C x ( x = 6, 8, 10, 12, 14). J Phys Chem B 2021; 125:13585-13596. [PMID: 34860023 DOI: 10.1021/acs.jpcb.1c09435] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Rhamnolipids are glycolipids produced by microorganisms with outstanding surfactant properties. They are a class of biosurfactants that are potential candidates for biodegradable and nontoxic replacements of current specialty synthetic surfactants. Building on our previous efforts in developing an efficient and practical chemical methodology to synthesize rhamnolipids allows us to now explore the tunability of rhamnolipid properties. Here, we explore the impact on solution self-assembly and adsorption at the air/water interface of symmetry of the two lipid tails for diastereomeric mixtures of a series of monorhamnolipids of the generic structure Rha-C14-Cx. Surface activity of the anionic forms of these molecules at pH 8 is described by surface tensiometry. Characteristics of their aggregation behavior in aqueous solutions including hydrodynamic radius, aggregation number, and aggregate morphology are determined using dynamic light scattering and time-resolved fluorescence quenching spectroscopy. The solution aggregation behavior of this series is found to unexpectedly vary in a nonmonotonic fashion. This is explained by molecular structural attributes of each series member that result in differences in the respective intermolecular interactions of various parts of these surfactants.
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Affiliation(s)
- Ricardo Palos Pacheco
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Laurel L Kegel
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | - Jeanne E Pemberton
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
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3
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Chandankere R, Ravikumar Y, Zabed HM, Sabapathy PC, Yun J, Zhang G, Qi X. Conversion of Agroindustrial Wastes to Rhamnolipid by Enterobacter sp. UJS-RC and Its Role against Biofilm-Forming Foodborne Pathogens. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:15478-15489. [PMID: 33319980 DOI: 10.1021/acs.jafc.0c05028] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Rhamnolipid is the main group of biosurfactants predominantly produced by Pseudomonas aeruginosa, a ubiquitous and opportunistic pathogen, which limits its large-scale exploitation. Thus, cost-effective rhamnolipid production from a newly isolated nonpathogenic Enterobacter sp. UJS-RC was investigated. The highest rhamnolipid production (4.4 ± 0.2 g/L) was achieved in a medium constituting agroindustrial wastes (sugarcane molasses and corn steep liquor) as substrates. Rhamnolipid exhibited reduced surface tension to 72-28 mN/m with an emulsification index of 75%. The structural analyses demonstrated the presence of methoxyl, carboxyl, and hydroxyl groups in rhamnolipid. Mass spectra indicated eight rhamnolipid congeners, where dirhamnolipid (m/z 650.01) was the dominant congener. Rhamnolipid inhibited biofilm formation of Staphylococcus aureus in a dose-dependent manner, supported by scanning electron microscopy disclosing the disruption of the microcolony/exopolysaccharide matrix. Rhamnolipid's ability to generate reactive oxygen species has thrown light on the mechanism through which the killing of test bacteria may occur.
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Affiliation(s)
- Radhika Chandankere
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Yuvaraj Ravikumar
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Hossain M Zabed
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Poorna Chandrika Sabapathy
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Junhua Yun
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Guoyan Zhang
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Xianghui Qi
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
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4
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Crouzet J, Arguelles-Arias A, Dhondt-Cordelier S, Cordelier S, Pršić J, Hoff G, Mazeyrat-Gourbeyre F, Baillieul F, Clément C, Ongena M, Dorey S. Biosurfactants in Plant Protection Against Diseases: Rhamnolipids and Lipopeptides Case Study. Front Bioeng Biotechnol 2020; 8:1014. [PMID: 33015005 PMCID: PMC7505919 DOI: 10.3389/fbioe.2020.01014] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Accepted: 08/03/2020] [Indexed: 12/17/2022] Open
Abstract
Biosurfactants are amphiphilic surface-active molecules that are produced by a variety of microorganisms including fungi and bacteria. Pseudomonas, Burkholderia, and Bacillus species are known to secrete rhamnolipids and lipopeptides that are used in a wide range of industrial applications. Recently, these compounds have been studied in a context of plant-microbe interactions. This mini-review describes the direct antimicrobial activities of these compounds against plant pathogens. We also provide the current knowledge on how rhamnolipids and lipopeptides stimulate the plant immune system leading to plant resistance to phytopathogens. Given their low toxicity, high biodegradability and ecological acceptance, we discuss the possible role of these biosurfactants as alternative strategies to reduce or even replace pesticide use in agriculture.
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Affiliation(s)
- Jérôme Crouzet
- Unité RIBP EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, Reims, France
| | - Anthony Arguelles-Arias
- MiPI laboratory, Gembloux Agro-Bio Tech, SFR Condorcet FR CNRS 3417, University of LieÌge, Gembloux, Belgium
| | - Sandrine Dhondt-Cordelier
- Unité RIBP EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, Reims, France
| | - Sylvain Cordelier
- Unité RIBP EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, Reims, France
| | - Jelena Pršić
- MiPI laboratory, Gembloux Agro-Bio Tech, SFR Condorcet FR CNRS 3417, University of LieÌge, Gembloux, Belgium
| | - Gregory Hoff
- MiPI laboratory, Gembloux Agro-Bio Tech, SFR Condorcet FR CNRS 3417, University of LieÌge, Gembloux, Belgium
| | | | - Fabienne Baillieul
- Unité RIBP EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, Reims, France
| | - Christophe Clément
- Unité RIBP EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, Reims, France
| | - Marc Ongena
- MiPI laboratory, Gembloux Agro-Bio Tech, SFR Condorcet FR CNRS 3417, University of LieÌge, Gembloux, Belgium
| | - Stéphan Dorey
- Unité RIBP EA 4707, SFR Condorcet FR CNRS 3417, University of Reims Champagne-Ardenne, Reims, France
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5
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Sancheti A, Ju L. Rhamnolipid Effects on Water Imbibition, Germination, and Initial Root and Shoot Growth of Soybeans. J SURFACTANTS DETERG 2020. [DOI: 10.1002/jsde.12383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ashwin Sancheti
- Department of Chemical and Biomolecular EngineeringThe University of Akron Akron OH USA
| | - Lu‐Kwang Ju
- Department of Chemical and Biomolecular EngineeringThe University of Akron Akron OH USA
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6
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Sancheti A, Ju LK. Eco-friendly rhamnolipid based fungicides for protection of soybeans from Phytophthora sojae. PEST MANAGEMENT SCIENCE 2019; 75:3031-3038. [PMID: 30891859 DOI: 10.1002/ps.5418] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 03/03/2019] [Accepted: 03/15/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Excessive use of chemical fungicides over the years for plant pathogen control has caused unwanted damage to non-target organisms and resistance buildup in the target organisms. These harmful effects have prompted the industry to look for more sustainable and eco-friendly solutions. Rhamnolipid is a naturally occurring surfactant that is biodegradable, relatively innocuous to non-target species and can effectively lyse zoospores, the life form responsible for the spread of Phytophthora. In this study, rhamnolipid based coatings were developed and evaluated for protection of soybeans from P. sojae zoospores. RESULTS Pure (acidic) rhamnolipid, when coated on the soybeans, affects the germination negatively. However, sodium and calcium complexed rhamnolipids do not interfere with germination. Seeds coated with 15-20 mg of developed formulation were planted in soil pots and then subjected to P. sojae infection by simulating flooding conditions and zoospore inoculation. Statistical analysis showed that sodium rhamnolipid based coating significantly improved the germination in presence of P. sojae from 42% to 73% (P = 0.017) while the germination of stress-free control was 85% (statistically similar to coated seeds, P = 1). CONCLUSION Neutralized rhamnolipid can protect soybeans from P. sojae without any negative effect on germination. This work illustrates the strategy to use rhamnolipid as effective fungicide. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Ashwin Sancheti
- Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH, USA
| | - Lu-Kwang Ju
- Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH, USA
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7
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Naughton PJ, Marchant R, Naughton V, Banat IM. Microbial biosurfactants: current trends and applications in agricultural and biomedical industries. J Appl Microbiol 2019; 127:12-28. [PMID: 30828919 DOI: 10.1111/jam.14243] [Citation(s) in RCA: 142] [Impact Index Per Article: 28.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 02/18/2019] [Accepted: 02/24/2019] [Indexed: 12/12/2022]
Abstract
Synthetic surfactants are becoming increasingly unpopular in many applications due to previously disregarded effects on biological systems and this has led to a new focus on replacing such products with biosurfactants that are biodegradable and produced from renewal resources. Microbially derived biosurfactants have been investigated in numerous studies in areas including: increasing feed digestibility in an agricultural context, improving seed protection and fertility, plant pathogen control, antimicrobial activity, antibiofilm activity, wound healing and dermatological care, improved oral cavity care, drug delivery systems and anticancer treatments. The development of the potential of biosurfactants has been hindered somewhat by the myriad of approaches taken in their investigations, the focus on pathogens as source species and the costs associated with large-scale production. Here, we focus on various microbial sources of biosurfactants and the current trends in terms of agricultural and biomedical applications.
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Affiliation(s)
- P J Naughton
- The Nutrition Innovation Centre for Food and Health (NICHE), School of Biomedical Sciences, Ulster University, Coleraine, County Londonderry, UK
| | - R Marchant
- The Nutrition Innovation Centre for Food and Health (NICHE), School of Biomedical Sciences, Ulster University, Coleraine, County Londonderry, UK
| | - V Naughton
- The Nutrition Innovation Centre for Food and Health (NICHE), School of Biomedical Sciences, Ulster University, Coleraine, County Londonderry, UK
| | - I M Banat
- The Nutrition Innovation Centre for Food and Health (NICHE), School of Biomedical Sciences, Ulster University, Coleraine, County Londonderry, UK
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8
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Abdel-Mawgoud AM, Stephanopoulos G. Simple glycolipids of microbes: Chemistry, biological activity and metabolic engineering. Synth Syst Biotechnol 2018; 3:3-19. [PMID: 29911195 PMCID: PMC5884252 DOI: 10.1016/j.synbio.2017.12.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 11/14/2017] [Accepted: 12/04/2017] [Indexed: 01/15/2023] Open
Abstract
Glycosylated lipids (GLs) are added-value lipid derivatives of great potential. Besides their interesting surface activities that qualify many of them to act as excellent ecological detergents, they have diverse biological activities with promising biomedical and cosmeceutical applications. Glycolipids, especially those of microbial origin, have interesting antimicrobial, anticancer, antiparasitic as well as immunomodulatory activities. Nonetheless, GLs are hardly accessing the market because of their high cost of production. We believe that experience of metabolic engineering (ME) of microbial lipids for biofuel production can now be harnessed towards a successful synthesis of microbial GLs for biomedical and other applications. This review presents chemical groups of bacterial and fungal GLs, their biological activities, their general biosynthetic pathways and an insight on ME strategies for their production.
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Affiliation(s)
| | - Gregory Stephanopoulos
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA
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9
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Potential applications of biosurfactant rhamnolipids in agriculture and biomedicine. Appl Microbiol Biotechnol 2017; 101:8309-8319. [PMID: 29018916 DOI: 10.1007/s00253-017-8554-4] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 09/25/2017] [Accepted: 09/26/2017] [Indexed: 10/18/2022]
Abstract
Rhamnolipids have recently emerged as promising bioactive molecules due to their novel structures, diverse and versatile biological functions, lower toxicity, higher biodegradability, as well as production from renewable resources. The advantages of rhamnolipids make them attractive targets for research in a wide variety of applications. Especially rhamnolipids are likely to possess potential applications of the future in areas such as biomedicine, therapeutics, and agriculture. The purpose of this mini review is to provide a comprehensive prospective of biosurfactant rhamnolipids as potential antimicrobials, immune modulators, and virulence factors, and anticancer agents in the field of biomedicine and agriculture that may meet the ever-increasing future pharmacological treatment and food safety needs in human health.
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10
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Biolytic Effect of Rhamnolipid Biosurfactant and Dodecyl Sulfate Against Phagotrophic Alga Ochromonas danica. J SURFACTANTS DETERG 2017. [DOI: 10.1007/s11743-017-2005-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Chen W, Qu Y, Xu Z, He F, Chen Z, Huang S, Li Y. Heavy metal (Cu, Cd, Pb, Cr) washing from river sediment using biosurfactant rhamnolipid. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:16344-16350. [PMID: 28547372 DOI: 10.1007/s11356-017-9272-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 05/16/2017] [Indexed: 06/07/2023]
Abstract
Heavy metal-contaminated sediments posed a serious threat to both human beings and environment. A biosurfactant, rhamnolipid, was employed as the washing agent to remove heavy metals in river sediment. Batch experiments were conducted to test the removal capability. The effects of rhamnolipid concentration, washing time, solution pH, and liquid/solid ratio were investigated. The speciation of heavy metals before and after washing in sediment was also analyzed. Heavy metal washing was favored at high concentration, long washing time, and high pH. In addition, the efficiency of washing was closely related to the original speciation of heavy metals in sediment. Rhamnolipid mainly targeted metals in exchangeable, carbonate-bound or Fe-Mn oxide-bound fractions. Overall, rhamnolipid biosurfactant as a washing agent could effectively remove heavy metals from sediment.
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Affiliation(s)
- Weifang Chen
- School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Rd, Shanghai, 200093, People's Republic of China
| | - Yan Qu
- School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Rd, Shanghai, 200093, People's Republic of China
| | - Zhihua Xu
- School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Rd, Shanghai, 200093, People's Republic of China.
| | - Feifei He
- School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Rd, Shanghai, 200093, People's Republic of China
| | - Zai Chen
- School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Rd, Shanghai, 200093, People's Republic of China
| | - Sisi Huang
- School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Rd, Shanghai, 200093, People's Republic of China
| | - Yuxiang Li
- School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Rd, Shanghai, 200093, People's Republic of China
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12
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Toward high-efficiency production of biosurfactant rhamnolipids using sequential fed-batch fermentation based on a fill-and-draw strategy. Colloids Surf B Biointerfaces 2017; 157:317-324. [PMID: 28609706 DOI: 10.1016/j.colsurfb.2017.06.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 05/26/2017] [Accepted: 06/06/2017] [Indexed: 11/24/2022]
Abstract
Rhamnolipids are the most promising biosurfactants, have widespread applications in many fields. However, low yield and productivity in fermentation caused a high production cost and thus prohibited the bulk applications of rhamnolipids in industry. In this study, a sequential fed-batch fermentation process with fill-and-draw operation was developed to improve rhamnolipids production. By utilizing this strategy, the total produced rhamnolipids reached over 150g/L, had a 163% and 102% increase over the traditional batch and fed-batch processes, respectively. This remarkable high production efficiency was achieved by the well-maintained high productivity of 0.4g/Lh for a period of 17 d. Astonishingly, the conversion yield was high as 84%, while this value was only 53.2% and 42.7% in the traditional batch and fed-batch process, respectively. The high-efficiency rhamnolipids production in this sequential fed-batch fermentation could be largely explained by a high presence of cell coupled with the replenishment of nutrients and dilution of toxic byproducts via fill-and-draw operation. In all, this validated fermentation strategy offers a great prospect for high-efficiency production of rhamnolipids in industry.
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13
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Palos Pacheco R, Eismin RJ, Coss CS, Wang H, Maier RM, Polt R, Pemberton JE. Synthesis and Characterization of Four Diastereomers of Monorhamnolipids. J Am Chem Soc 2017; 139:5125-5132. [DOI: 10.1021/jacs.7b00427] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Ricardo Palos Pacheco
- Department
of Chemistry and Biochemistry and ‡Department of Soil, Water and Environmental
Science, University of Arizona, Tucson, Arizona 85721, United States
| | - Ryan J. Eismin
- Department
of Chemistry and Biochemistry and ‡Department of Soil, Water and Environmental
Science, University of Arizona, Tucson, Arizona 85721, United States
| | - Clifford S. Coss
- Department
of Chemistry and Biochemistry and ‡Department of Soil, Water and Environmental
Science, University of Arizona, Tucson, Arizona 85721, United States
| | - Hui Wang
- Department
of Chemistry and Biochemistry and ‡Department of Soil, Water and Environmental
Science, University of Arizona, Tucson, Arizona 85721, United States
| | - Raina M. Maier
- Department
of Chemistry and Biochemistry and ‡Department of Soil, Water and Environmental
Science, University of Arizona, Tucson, Arizona 85721, United States
| | - Robin Polt
- Department
of Chemistry and Biochemistry and ‡Department of Soil, Water and Environmental
Science, University of Arizona, Tucson, Arizona 85721, United States
| | - Jeanne E. Pemberton
- Department
of Chemistry and Biochemistry and ‡Department of Soil, Water and Environmental
Science, University of Arizona, Tucson, Arizona 85721, United States
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14
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Soltani Dashtbozorg S, Kohl J, Ju LK. Rhamnolipid Adsorption in Soil: Factors, Unique Features, and Considerations for Use as Green Antizoosporic Agents. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:3330-3337. [PMID: 27054522 DOI: 10.1021/acs.jafc.6b00215] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In aqueous solutions, rhamnolipids effectively kill the motile zoospores responsible for spreading many pathogens, including soy-infecting Phytophthora sojae. For use in soil, adsorption properties need to be considered. Having low critical micelle concentrations, rhamnolipids tend to form micelles/aggregates with unknown effects on soil adsorption. Effects of soil pH, rhamnolipid congener structure, and concentration were examined. Congeners were identified and each quantitated for adsorptive partitioning. The adsorption isotherm at pH 6.5 showed a multi-stage profile plateauing at 1700 μg/g of soil. Less hydrophilic congeners adsorbed preferentially: R-C10-C12 > R-C10-C12:1 > RR-C10-C12:1 > RR-C10-C12 > R-C10-C10 > RR-C10-C10 > R-C8-C10 > RR-C8-C10 (where R is rhamnose and C# is the carbon number of β-hydroxy fatty acid). Adsorptive selectivity among congeners was very clear in dilute solutions but diminished with increasing concentrations. Results were interpreted with aggregate formation in solutions and on the soil surface. The cost estimate made accordingly supported the economic feasibility of rhamnolipid antizoosporic uses in soil.
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Affiliation(s)
- Soroosh Soltani Dashtbozorg
- Department of Chemical and Biomolecular Engineering, The University of Akron , Akron, Ohio 44325, United States
| | - Jacob Kohl
- Department of Chemical and Biomolecular Engineering, The University of Akron , Akron, Ohio 44325, United States
| | - Lu-Kwang Ju
- Department of Chemical and Biomolecular Engineering, The University of Akron , Akron, Ohio 44325, United States
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