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Journal articles on the topic 'Rhamnolipides (RLs)'

Author: Grafiati
Published: 5 October 2023

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1

Chebbi, Alif, Massimiliano Tazzari, Cristiana Rizzi, et al. "Burkholderia thailandensis E264 as a promising safe rhamnolipids’ producer towards a sustainable valorization of grape marcs and olive mill pomace." Applied Microbiology and Biotechnology 105, no. 9 (2021): 3825–42. http://dx.doi.org/10.1007/s00253-021-11292-0.

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Abstract Within the circular economy framework, our study aims to assess the rhamnolipid production from winery and olive oil residues as low-cost carbon sources by nonpathogenic strains. After evaluating various agricultural residues from those two sectors, Burkholderia thailandensis E264 was found to use the raw soluble fraction of nonfermented (white) grape marcs (NF), as the sole carbon and energy source, and simultaneously, reducing the surface tension to around 35 mN/m. Interestingly, this strain showed a rhamnolipid production up to 1070 mg/L (13.37 mg/g of NF), with a higher purity, on
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2

Mishra, Alok K., Rikesh K. Dubey, Shivraj M. Yabaji, and Swati Jaiswal. "Evaluation of antimycobacterial rhamnolipid production from non-cytotoxic strains of Pseudomonas aeruginosa isolated from rhizospheric soil of medicinal plants." International Journal of Biological Research 4, no. 2 (2016): 112. http://dx.doi.org/10.14419/ijbr.v4i2.6429.

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Rhamnolipids (RLs) are the bacterial derived biosurfactants and known for a wide range of industrial and therapeutic applications. They exhibit potent anti-bacterial activity against various gram positive, gram negative and acid fast bacteria including Mycobacterium tuberculosis. Since, Pseudomonas is one of the largest known genuses containing a variety of rhamnolipid producing strains. Therefore, in this study, we selectively isolated the Pseudomonas aeruginosa strains from the rhizospheric soil of the Indian plants of medicinal value, e.g. Azadirachta Indica and Ficus spp., and evaluated th
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Yoshimura, Ingrid, Ana Maria Salazar-Bryam, Adriano Uemura de Faria, Lucas Prado Leite, Roberta Barros Lovaglio, and Jonas Contiero. "Guava Seed Oil: Potential Waste for the Rhamnolipids Production." Fermentation 8, no. 8 (2022): 379. http://dx.doi.org/10.3390/fermentation8080379.

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Guava is consumed in natura and is also of considerable importance to the food industry. The seeds and peel of this fruit are discarded, however, guava seeds yield oil (~13%) that can be used for the bioproducts synthesis. The use of a by-product as a carbon source is advantageous, as it reduces the environmental impact of possible harmful materials to nature, while adding value to products. In addition, the use of untested substrates can bring new yield and characterization results. Thus, this research sought to study rhamnolipids (RLs) production from guava seed oil, a by-product of the fruc
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4

Zhang, Haoran, Xiaorong Yu, Qing Li, et al. "Effects of Rhamnolipids on Growth Performance, Immune Function, and Cecal Microflora in Linnan Yellow Broilers Challenged with Lipopolysaccharides." Antibiotics 10, no. 8 (2021): 905. http://dx.doi.org/10.3390/antibiotics10080905.

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This present study aimed to investigate the effects of rhamnolipids (RLS) on the growth performance, intestinal morphology, immune function, short-chain fatty acid content, and microflora community in broiler chickens challenged with lipopolysaccharides (LPS). A total of 450 broiler chickens were randomly allocated into three groups: basal diet with no supplement (NCO), basal diet with bacitracin (ANT), and basal diet with rhamnolipids (RLS). After 56 d of feeding, 20 healthy broilers were selected from each group, with half being intraperitoneally injected with lipopolysaccharides (LPS) and t
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5

Semkova, Severina, Georgi Antov, Ivan Iliev, et al. "Rhamnolipid Biosurfactants—Possible Natural Anticancer Agents and Autophagy Inhibitors." Separations 8, no. 7 (2021): 92. http://dx.doi.org/10.3390/separations8070092.

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Background/Aim: A number of biologically active substances were proved as an alternative to conventional anticancer medicines. The aim of the study is in vitro investigation of the anticancer activity of mono- and di-Rhamnolipids (RL-1 and RL-2) against human breast cancer. Additionally, the combination with Cisplatin was analyzed. Materials and Methods: Breast cell lines (MCF-10A, MCF-7 and MDA-MB-231) were treated with RLs and in combination with Cisplatin. The viability was analyzed using MTT assay, and investigation of autophagy was performed via acridine orange staining. Results: In contr
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6

Sobri, Izuani Mohamad, Murni Halim, Oi-Ming Lai, et al. "Emulsification Characteristics of Rhamnolipids by Pseudomonas aeruginosa Using Coconut Oil as Carbon Source." Journal of Environmental Microbiology and Toxicology 6, no. 1 (2018): 7–12. http://dx.doi.org/10.54987/jemat.v6i1.400.

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Rhamnolipids (RLs) production using coconut oil as a carbon source by the bacterium P. aeruginosa is studied. This bacterium was grown in media containing 1% carbon source (glucose/ coconut oil). The RLs were characterized by emulsification index (E24), thermal stability and oil spreading test. Further RLs quantification was carried out by the orcinol assay with L-rhamnose as the standard. The result showed that the highest production of RLs occurred in the presence of both coconut oil and glucose at 96 h (2.51 g/L). A stable emulsification index (E24) was observed using diesel with a maximum
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7

Zahidullah, Zahidullah, Muhammad Faisal Siddiqui, Shamas Tabraiz, et al. "Targeting Microbial Biofouling by Controlling Biofilm Formation and Dispersal Using Rhamnolipids on RO Membrane." Membranes 12, no. 10 (2022): 928. http://dx.doi.org/10.3390/membranes12100928.

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Finding new biological ways to control biofouling of the membrane in reverse osmosis (RO) is an important substitute for synthetic chemicals in the water industry. Here, the study was focused on the antimicrobial, biofilm formation, and biofilm dispersal potential of rhamnolipids (RLs) (biosurfactants). The MTT assay was also carried out to evaluate the effect of RLs on biofilm viability. Biofilm was qualitatively and quantitatively assessed by crystal violet assay, light microscopy, fluorescence microscopy (bacterial biomass (µm2), surface coverage (%)), and extracellular polymeric substances
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8

Wasoh, Helmi, Sarinah Baharun, Murni Halim, Ahmad Firdaus Lajis, Arbakariya Ariff, and Oi-Ming Lai. "Production of rhamnolipids by locally isolated Pseudomonas aeruginosa using sunflower oil as carbon source." Bioremediation Science and Technology Research 5, no. 1 (2017): 1–6. http://dx.doi.org/10.54987/bstr.v5i1.350.

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Biosurfactants are surface active compounds and amphiphatic in nature which consist of hydrophilic head and hydrophobic tail accumulating at the interphase of two immiscible liquid with different polarity. A study was conducted to investigate the effectiveness of sunflower oil in the production of rhamnolipids (RLs) by locally isolated Pseudomonas aeruginosa in shake flask fermentation. In this process, four different fermentation treatments were done for seven days at 30°C and 180 rpm. Sampling was carried out in time intervals of 24 h followed by monitoring of cell growth and biosurfactants
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9

Giugliano, Rosa, Carmine Buonocore, Carla Zannella, et al. "Antiviral Activity of the Rhamnolipids Mixture from the Antarctic Bacterium Pseudomonas gessardii M15 against Herpes Simplex Viruses and Coronaviruses." Pharmaceutics 13, no. 12 (2021): 2121. http://dx.doi.org/10.3390/pharmaceutics13122121.

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Emerging and re-emerging viruses represent a serious threat to human health at a global level. In particular, enveloped viruses are one of the main causes of viral outbreaks, as recently demonstrated by SARS-CoV-2. An effective strategy to counteract these viruses could be to target the envelope by using surface-active compounds. Rhamnolipids (RLs) are microbial biosurfactants displaying a wide range of bioactivities, such as antibacterial, antifungal and antibiofilm, among others. Being of microbial origin, they are environmentally-friendly, biodegradable, and less toxic than synthetic surfac
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10

Sharma, Pushpinder, and Nivedita Sharma. "Microbial Biosurfactants-an Ecofriendly Boon to Industries for Green Revolution." Recent Patents on Biotechnology 14, no. 3 (2020): 169–83. http://dx.doi.org/10.2174/1872208313666191212094628.

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Biosurfactants have a biological origin, and are widely known as surface active agents. Different classes of biosurfactant have significant importance in both the biotechnological and microbiological arena. Pseudomonas aeruginosa, Bacillus subtilis and Candida sp. are important classes of microorganisms that are highly investigated for the production of rhamnolipids (RLs) biosurfactants. Rhamnolipids have unique surface activity and have gained interest in various industrial applications. Due to their high biodegradability, renewability and functionally maintenance at extreme conditions, micro
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11

Schellenberger, Romain, Jérôme Crouzet, Arvin Nickzad, et al. "Bacterial rhamnolipids and their 3-hydroxyalkanoate precursors activate Arabidopsis innate immunity through two independent mechanisms." Proceedings of the National Academy of Sciences 118, no. 39 (2021): e2101366118. http://dx.doi.org/10.1073/pnas.2101366118.

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Plant innate immunity is activated upon perception of invasion pattern molecules by plant cell-surface immune receptors. Several bacteria of the genera Pseudomonas and Burkholderia produce rhamnolipids (RLs) from l-rhamnose and (R)-3-hydroxyalkanoate precursors (HAAs). RL and HAA secretion is required to modulate bacterial surface motility, biofilm development, and thus successful colonization of hosts. Here, we show that the lipidic secretome from the opportunistic pathogen Pseudomonas aeruginosa, mainly comprising RLs and HAAs, stimulates Arabidopsis immunity. We demonstrate that HAAs are se
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12

Buonocore, Carmine, Rosa Giugliano, Gerardo Della Sala, et al. "Evaluation of Antimicrobial Properties and Potential Applications of Pseudomonas gessardii M15 Rhamnolipids towards Multiresistant Staphylococcus aureus." Pharmaceutics 15, no. 2 (2023): 700. http://dx.doi.org/10.3390/pharmaceutics15020700.

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Staphylococcus aureus is a Gram-positive opportunistic human pathogen responsible for severe infections and thousands of deaths annually, mostly due to its multidrug-resistant (MDR) variants. The cell membrane has emerged as a promising new therapeutic target, and lipophilic molecules, such as biosurfactants, are currently being utilized. Herein, we evaluated the antimicrobial activity of a rhamnolipids mixture produced by the Antarctic marine bacterium Pseudomonas gessardii M15. We demonstrated that our mixture has bactericidal activity in the range of 12.5–50 µg/mL against a panel of clinica
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13

Avramovic, Natasa, Snezana Nikolic-Mandic, and Ivanka Karadzic. "Influence of rhamnolipids, produced by Pseudomonas aeruginosa NCAIM(P), B001380 on Cr(VI) removal capacity in liquid medium." Journal of the Serbian Chemical Society 78, no. 5 (2013): 639–51. http://dx.doi.org/10.2298/jsc120831115a.

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Pseudomonas aeruginosa NCAIM(P), B001380, a propitious bacterial strain isolated from mineral cutting oil was identified to be chromium tolerant and a producer of biosurfactant rhamnolipid (RL) with potential application in heavy metal bioremediation. Culture growth, RL production and Cr(VI) removal capacity of the strain in the presence of 50 mg L-1 (I) and 100 mg L-1 of Cr(VI) (II) were studied. Maximum of RL production were found in the late-stationary phase at 72 h for both Cr(VI)-amended cultures: I (236 mg L-1) and II (160 mg L-1), as well as the maximum of Cr(VI) removal capacity: 70 %
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14

Monnier, Noadya, Aurélien Furlan, Sébastien Buchoux, et al. "Exploring the Dual Interaction of Natural Rhamnolipids with Plant and Fungal Biomimetic Plasma Membranes through Biophysical Studies." International Journal of Molecular Sciences 20, no. 5 (2019): 1009. http://dx.doi.org/10.3390/ijms20051009.

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Rhamnolipids (RLs) are potential biocontrol agents for crop culture protection. Their mode of action has been proposed as dual, combining plant protection activation and antifungal activities. The present work focuses on the interaction of natural RLs with plant and fungi membrane models at the molecular scale. Representative models were constructed and the interaction with RLs was studied by Fourier transform infrared (FTIR) and deuterium nuclear magnetic resonance (2H NMR) spectroscopic measurements. Molecular dynamic (MD) simulations were performed to investigate RL insertion in lipid bilay
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15

Buonocore, Carmine, Pietro Tedesco, Giovanni Andrea Vitale, et al. "Characterization of a New Mixture of Mono-Rhamnolipids Produced by Pseudomonas gessardii Isolated from Edmonson Point (Antarctica)." Marine Drugs 18, no. 5 (2020): 269. http://dx.doi.org/10.3390/md18050269.

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Rhamnolipids (RLs) are surface-active molecules mainly produced by Pseudomonas spp. Antarctica is one of the less explored places on Earth and bioprospecting for novel RL producer strains represents a promising strategy for the discovery of novel structures. In the present study, 34 cultivable bacteria isolated from Edmonson Point Lake, Ross Sea, Antarctica were subjected to preliminary screening for the biosurfactant activity. The positive strains were identified by 16S rRNA gene sequencing and the produced RLs were characterized by liquid chromatography coupled to high resolution mass spectr
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16

Platel, Rémi, Ludovic Chaveriat, Sarah Le Guenic, et al. "Importance of the C12 Carbon Chain in the Biological Activity of Rhamnolipids Conferring Protection in Wheat against Zymoseptoria tritici." Molecules 26, no. 1 (2020): 40. http://dx.doi.org/10.3390/molecules26010040.

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The hemibiotrophic fungus Zymoseptoria tritici, responsible for Septoria tritici blotch, is currently the most devastating foliar disease on wheat crops worldwide. Here, we explored, for the first time, the ability of rhamnolipids (RLs) to control this pathogen, using a total of 19 RLs, including a natural RL mixture produced by Pseudomonas aeruginosa and 18 bioinspired RLs synthesized using green chemistry, as well as two related compounds (lauric acid and dodecanol). These compounds were assessed for in vitro antifungal effect, in planta defence elicitation (peroxidase and catalase enzyme ac
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17

Kumar, Rajat, Davidraj Johnravindar, Jonathan W. C. Wong, Raffel Dharma Patria, and Guneet Kaur. "Economical Di-Rhamnolipids Biosynthesis by Non-Pathogenic Burkholderia thailandensis E264 Using Post-Consumption Food Waste in a Biorefinery Approach." Sustainability 15, no. 1 (2022): 59. http://dx.doi.org/10.3390/su15010059.

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Rhamnolipids (RLs) are one of the most promising eco-friendly green alternatives to commercially viable fossil fuel-based surfactants. However, the current bioprocess practices cannot meet the required affordability, quantity, and biocompatibility within an industrially relevant framework. To circumvent these issues, our study aims to develop a sustainable biorefinery approach using post-consumption food waste as a second-generation feedstock. In-depth substrate screening revealed that food waste hydrolysate (FWH) was rich in readily assimilable carbohydrates, volatile fatty acids, and amino a
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18

Eleni G. Andreadou, Georgios Katsipis, Magda Tsolaki, and Anastasia A. Pantazaki. "Bacterial rhamnolipids (RLs) in saliva of Alzheimer's disease and Mild Cognitive Impairment patients and correlation with neuroinflammation and cognitive state." GSC Advanced Research and Reviews 06, no. 03 (2021): 209–19. http://dx.doi.org/10.30574/gscarr.2021.6.3.0062.

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Alzheimer’s disease (AD) is increasingly affecting the aging population and the estimated prevalence reaches 50 million people worldwide. The need for the discovery of new biomarkers for AD diagnosis is urgent and especially in biological fluids other than cerebrospinal fluid (CSF), as its collection is invasive. Arguments are numerous that chronic bacterial infections might be considered as one of the possible causes of AD. Rhamnolipids (RLs) are bacterial virulence factors, suspicious for dysfunctions and disorders including AD. The aim of this pilot trial was to investigate RLs levels in sa
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19

Dardouri, Maïssa, Ana Bettencourt, Victor Martin, et al. "Assuring the Biofunctionalization of Silicone Covalently Bonded to Rhamnolipids: Antibiofilm Activity and Biocompatibility." Pharmaceutics 14, no. 9 (2022): 1836. http://dx.doi.org/10.3390/pharmaceutics14091836.

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Silicone-based medical devices composed of polydimethylsiloxane (PDMS) are widely used all over the human body (e.g., urinary stents and catheters, central venous catheters stents) with extreme clinical success. Nevertheless, their abiotic surfaces, being prone to microorganism colonization, are often involved in infection occurrence. Improving PDMS antimicrobial properties by surface functionalization with biosurfactants to prevent related infections has been the goal of different works, but studies that mimic the clinical use of these novel surfaces are missing. This work aims at the biofunc
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Pierre, Elise, Paulo Marcelo, Antoine Croutte, et al. "Impact of Rhamnolipids (RLs), Natural Defense Elicitors, on Shoot and Root Proteomes of Brassica napus by a Tandem Mass Tags (TMTs) Labeling Approach." International Journal of Molecular Sciences 24, no. 3 (2023): 2390. http://dx.doi.org/10.3390/ijms24032390.

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The rapeseed crop is susceptible to many pathogens such as parasitic plants or fungi attacking aerial or root parts. Conventional plant protection products, used intensively in agriculture, have a negative impact on the environment as well as on human health. There is therefore a growing demand for the development of more planet-friendly alternative protection methods such as biocontrol compounds. Natural rhamnolipids (RLs) can be used as elicitors of plant defense mechanisms. These glycolipids, from bacteria secretome, are biodegradable, non-toxic and are known for their stimulating and prote
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21

Wang, Yangyang, Shaofeng Li, Xiaoshu Wang, et al. "Biochelator Assisted Phytoremediation for Cadmium (Cd) Pollution in Paddy Field." Sustainability 13, no. 21 (2021): 12170. http://dx.doi.org/10.3390/su132112170.

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To evaluate the efficacy of biochelators for phytoremediation of cadmium (Cd), effects of biochelators (humic acid, HA; polyaspartic acid, PASP; rhamnolipid, RLs) and synthetic chelator (sodium tripolyphosphate, STPP) on the growth, accumulation, and antioxidant index of Cd were investigated in Iris sibirica L. The results indicated that the addition of HA increased the dry weight of leaves and stems, and the addition of PASP, RLs, and STPP increased the growth of leaves but inhibited the growth of stems. The determination of Cd accumulation indicated that HA decreased the content of Cd in all
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22

Chlumsky, Ondrej, Heidi J. Smith, Albert E. Parker, et al. "Evaluation of the Antimicrobial Efficacy of N-Acetyl-l-Cysteine, Rhamnolipids, and Usnic Acid—Novel Approaches to Fight Food-Borne Pathogens." International Journal of Molecular Sciences 22, no. 21 (2021): 11307. http://dx.doi.org/10.3390/ijms222111307.

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In the food industry, the increasing antimicrobial resistance of food-borne pathogens to conventional sanitizers poses the risk of food contamination and a decrease in product quality and safety. Therefore, we explored alternative antimicrobials N-Acetyl-l-cysteine (NAC), rhamnolipids (RLs), and usnic acid (UA) as a novel approach to prevent biofilm formation and reduce existing biofilms formed by important food-borne pathogens (three strains of Salmonella enterica and two strains of Escherichia coli, Listeria monocytogenes, Staphylococcus aureus). Their effectiveness was evaluated by determin
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23

Tong, Le, Weiting Liu, Weijia Lin, et al. "Biosurfactant rhamnolipid enhanced modification of corn stalk and its application for sorption of phenanthrene." Water Science and Technology 76, no. 5 (2017): 1167–76. http://dx.doi.org/10.2166/wst.2017.281.

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The application of modified agricultural wastes for removing polycyclic aromatic hydrocarbons (PAHs) from water is gaining a growing interest. However, most modified methods using synthetic chemicals may cause secondary pollution. To overcome this limitation, in this study, a rhamnolipid modified corn stalk (RL-CS) for the removal of phenanthrene (PHE) from aqueous solution was prepared using a rhamnolipid-enhanced acid modification method. RL-CS with higher surface area and lower polarity exhibited higher PHE removal efficiency than that of raw corn stalk (RCS). The adsorption kinetics of RL-
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Bertuso, Paula de Camargo, Crisiane Aparecida Marangon, and Marcia Nitschke. "Susceptibility of Vegetative Cells and Endospores of Bacillus cereus to Rhamnolipid Biosurfactants and Their Potential Application in Dairy." Microorganisms 10, no. 9 (2022): 1860. http://dx.doi.org/10.3390/microorganisms10091860.

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Bacillus cereus is a Gram-positive, endospore-forming bacterium well-known as a food pathogen that causes great losses in the food industry, especially in dairy. In this study, rhamnolipid (RL) biosurfactants were evaluated as a bio-based alternative for controlling the growth of vegetative cells and endospores of B. cereus. RLs were tested against 14 B. cereus strains isolated from different types of foodstuffs. The antimicrobial activity against vegetative cells and endospores revealed minimal inhibitory concentration (MIC) values of 0.098 mg/mL for almost all strains tested and minimal bact
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25

Blesken, Christian C., Tessa Strümpfler, Till Tiso, and Lars M. Blank. "Uncoupling Foam Fractionation and Foam Adsorption for Enhanced Biosurfactant Synthesis and Recovery." Microorganisms 8, no. 12 (2020): 2029. http://dx.doi.org/10.3390/microorganisms8122029.

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The production of biosurfactants is often hampered by excessive foaming in the bioreactor, impacting system scale-up and downstream processing. Foam fractionation was proposed to tackle this challenge by combining in situ product removal with a pre-purification step. In previous studies, foam fractionation was coupled to bioreactor operation, hence it was operated at suboptimal parameters. Here, we use an external fractionation column to decouple biosurfactant production from foam fractionation, enabling continuous surfactant separation, which is especially suited for system scale-up. As a sub
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BAZYLYAK, Liliya, Andriy KYTSYA, Pavlo LYUTYI, Orest KUNTYI, Alla PROKOPALO, and Olena KARPENKO. "SYNTHESIS AND ANTIMICROBIAL ACTIVITY OF COLLOIDAL SOLUTIONS OF BICOMPONENT Ag/CuO NANOPARTICLES STABILIZED BY RAMNOLIPID." Proceedings of the Shevchenko Scientific Society. Series Сhemical Sciences 2022, no. 70 (2022): 159–68. http://dx.doi.org/10.37827/ntsh.chem.2022.70.159.

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Despite the extremely high activity of researchers in the direction of green synthesis of nano-particles of silver, copper, as well as bimetallic nanoparticles Ag/Cu-NPs, the many aspects of the synthesis of nanoparticles based on silver and copper remain unexplored, in particular, the studies on the influence of the nature of biosurfactants on the characteristics are relevant obtained nano¬particles, in particular their size, shape, etc., as well as the influence of the morphology and compo¬sition of nanoparticles on their antimicrobial properties. Therefore, the purpose of this work was to s
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Hussain Mian, Abrar. "Isolation And Characterization Of Biosurfactant Producing Bacteria From Different Environmental Soil Samples." Journal of Toxicology and Environmental Sciences 1, no. 1 (2021): 36–47. http://dx.doi.org/10.55124/jtes.v1i1.133.

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Biosurfactants are natural substances produced by several bacterial and fungal organisms that are amphiphilic and are extracellular (a part of the cell membrane). Biosurfactants can reduce the stress between solids and liquids on the surface and at the end. Biosurfactants have several properties, i.e. they are stable, less harmful, as well as readily degradable, and extremely eco-friendly. Biosurfactants also have a wide range of industrial uses because they are a versatile category of chemical substances. The principal justification for conducting such research was the isolation of possible b
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El-Housseiny, Ghadir S., Khaled M. Aboshanab, Mohammad M. Aboulwafa, and Nadia A. Hassouna. "Structural and Physicochemical Characterization of Rhamnolipids produced by Pseudomonas aeruginosa P6." AMB Express 10, no. 1 (2020). http://dx.doi.org/10.1186/s13568-020-01141-0.

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Abstract Rhamnolipids are important biosurfactants for application in bioremediation, enhanced oil recovery, pharmaceutical, and detergent industry. In this study, rhamnolipids extracted from P. aeruginosa P6 were characterized to determine their potential fields of application. Thin-layer chromatographic analysis of the produced rhamnolipids indicated the production of two homologues: mono- and di-rhamnolipids, whose structures were verified by 1H and 13C nuclear magnetic resonance spectroscopy. Additionally, high performance liquid chromatography-mass spectrometry identified seven different
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Shusterman, Ella, Abigail Mottahedeh, and Merideth McCarthy. "The Synergistic Effects of Rhamnolipids and Antibiotics Against Bacteria." Journal of Student Research 10, no. 2 (2021). http://dx.doi.org/10.47611/jsrhs.v10i2.1495.

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Antibiotics are used to combat bacterial infections by slowing down and preventing the proliferation of bacteria. Antibiotic resistance is a threat to human health, attributed to its overuse and misuse. Altering the membrane permeability to induce antibiotic uptake may be an effective strategy used against both Gram-positive and Gram-negative infectious bacteria. Rhamnolipids (RLs) are biosurfactants produced by Pseudomonas aeruginosa. RLs surface-active properties operate by creating holes in bacterial cell membranes, increasing target cell permeability; allowing antibiotics to penetrate the
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Zhang, Ruiqiang, Xueyan Shi, Yuqi Chen, Jinsong Liu, Yanping Wu, and Yinglei Xu. "Multi-Omics Revealed the Protective Effects of Rhamnolipids in Lipopolysaccharide Challenged Broilers." Frontiers in Immunology 13 (February 18, 2022). http://dx.doi.org/10.3389/fimmu.2022.824664.

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Rhamnolipid (RL) is a glycolipid biosurfactant and exhibits the following outstanding characteristics: strong antibacterial properties, low toxicity, and high biodegradability. The present research was conducted to explore the protective effects and mechanisms of rhamnolipids as an alternative to antibiotics in LPS (lipopolysaccharide)-challenged broilers. 16S rRNA gene sequencing and metabolomics were used for analyzing the cecal microbial composition and serum metabolites. Dietary antibiotics and RLS supplementation decreased the weight loss rate, enhanced serum immunoglobulin levels, reduce
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31

Awasthi, Deepika, Yung-Hsu Tang, Bashar Amer, et al. "Adaptive evolution of Methylotuvimicrobium alcaliphilum to grow in the presence of rhamnolipids improves fatty acid and rhamnolipid production from CH4." Journal of Industrial Microbiology and Biotechnology 49, no. 2 (2022). http://dx.doi.org/10.1093/jimb/kuac002.

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Abstract Rhamnolipids (RLs) are well-studied biosurfactants naturally produced by pathogenic strains of Pseudomonas aeruginosa. Current methods to produce RLs in native and heterologous hosts have focused on carbohydrates as production substrate; however, methane (CH4) provides an intriguing alternative as a substrate for RL production because it is low cost and may mitigate greenhouse gas emissions. Here, we demonstrate RL production from CH4 by Methylotuvimicrobium alcaliphilum DSM19304. RLs are inhibitory to M. alcaliphilum growth (<0.05 g/l). Adaptive laboratory evolution was perfor
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Botcazon, Camille, Thomas Bergia, Didier Lecouturier, et al. "Rhamnolipids and fengycins, very promising amphiphilic antifungal compounds from bacteria secretomes, act on Sclerotiniaceae fungi through different mechanisms." Frontiers in Microbiology 13 (September 29, 2022). http://dx.doi.org/10.3389/fmicb.2022.977633.

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Rhamnolipids (RLs) and fengycins (FGs) are amphiphilic lipid compounds from bacteria secretomes proposed to replace synthetic pesticides for crop protection. They both display plant defense triggering properties and direct antimicrobial activities. In particular, they have well reported antifungal effects against phytopathogenic fungi. RLs and FGs are considered to act through a direct interaction with membrane lipids and a destabilization of microorganism plasma membrane, thereby limiting the risk of resistance emergence. The main objective of this work was to gain insights in the antimycelia
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33

Thakur, Priyanka, Neeraj K. Saini, Vijay Kumar Thakur, Vijai Kumar Gupta, Reena V. Saini, and Adesh K. Saini. "Rhamnolipid the Glycolipid Biosurfactant: Emerging trends and promising strategies in the field of biotechnology and biomedicine." Microbial Cell Factories 20, no. 1 (2021). http://dx.doi.org/10.1186/s12934-020-01497-9.

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AbstractRhamnolipids (RLs) are surface-active compounds and belong to the class of glycolipid biosurfactants, mainly produced from Pseudomonas aeruginosa. Due to their non-toxicity, high biodegradability, low surface tension and minimum inhibitory concentration values, they have gained attention in various sectors like food, healthcare, pharmaceutical and petrochemicals. The ecofriendly biological properties of rhamnolipids make them potent materials to be used in therapeutic applications. RLs are also known to induce apoptosis and thus, able to inhibit proliferation of cancer cells. RLs can a
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Bao, Xiaoyan, Kang Qian, Mengjiao Xu, et al. "Intestinal epithelium penetration of liraglutide via cholic acid pre-complexation and zein/rhamnolipids nanocomposite delivery." Journal of Nanobiotechnology 21, no. 1 (2023). http://dx.doi.org/10.1186/s12951-022-01743-9.

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Abstract Background Oral administration offered a painless way and improved compliance for diabetics. However, the emerging GLP-1 analog peptide drugs for diabetes primarily rely on the injection route, and the development of oral dosage forms was hampered by the low oral bioavailability due to the structural vulnerability to digestive enzymes and molecule impermeability in the gastrointestinal tract. Results In this study, the non-covalent interaction between cholic acid (CA) and liraglutide (LIRA) was found and theoretically explained by molecular docking simulation. Formation of this physic
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Mottola, Milagro, María C. Bertolino, Lucille Tihomirova Kourdova, et al. "Nanoemulsions of synthetic rhamnolipids act as plant resistance inducers without damaging plant tissues or affecting soil microbiota." Frontiers in Plant Science 14 (August 22, 2023). http://dx.doi.org/10.3389/fpls.2023.1195718.

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Plant pathogens and pests can cause significant losses in crop yields, affecting food security and the global economy. Many traditional chemical pesticides are used to combat these organisms. This can lead to the development of pesticide-resistant strains of pathogens/insects and negatively impact the environment. The development of new bioprotectants, which are less harmful to the environment and less likely to lead to pesticide-resistance, appears as a sustainable strategy to increase plant immunity. Natural Rhamnolipids (RL-Nat) are a class of biosurfactants with bioprotectant properties th
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Rodríguez-Moraga, Nely, Francisco Ramos-Martín, Sébastien Buchoux, Sonia Rippa, Nicola D’Amelio, and Catherine Sarazin. "The effect of rhamnolipids on fungal membrane models as described by their interactions with phospholipids and sterols: An in silico study." Frontiers in Chemistry 11 (February 21, 2023). http://dx.doi.org/10.3389/fchem.2023.1124129.

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Introduction: Rhamnolipids (RLs) are secondary metabolites naturally produced by bacteria of the genera Pseudomonas and Burkholderia with biosurfactant properties. A specific interest raised from their potential as biocontrol agents for crop culture protection in regard to direct antifungal and elicitor activities. As for other amphiphilic compounds, a direct interaction with membrane lipids has been suggested as the key feature for the perception and subsequent activity of RLs.Methods: Molecular Dynamics (MD) simulations are used in this work to provide an atomistic description of their inter
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Platel, Rémi, Anca Lucau-Danila, Raymonde Baltenweck, et al. "Bioinspired Rhamnolipid Protects Wheat Against Zymoseptoria tritici Through Mainly Direct Antifungal Activity and Without Major Impact on Leaf Physiology." Frontiers in Plant Science 13 (June 3, 2022). http://dx.doi.org/10.3389/fpls.2022.878272.

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Rhamnolipids (RLs), glycolipids biosynthesized by the Pseudomonas and Burkholderia genera, are known to display various activities against a wide range of pathogens. Most previous studies on RLs focused on their direct antimicrobial activity, while only a few reports described the mechanisms by which RLs induce resistance against phytopathogens and the related fitness cost on plant physiology. Here, we combined transcriptomic and metabolomic approaches to unravel the mechanisms underlying RL-induced resistance in wheat against the hemibiotrophic fungus Zymoseptoria tritici, a major pathogen of
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