Monolayer Behavior of Cyclic and Linear Forms of Surfactins: Thermodynamic Analysis of Langmuir Monolayers and AFM Study of Langmuir-Blodgett Monolayers

Taira, Toshiaki; Ikeda, Sakuji; Kawamura, Daisuke; Sakai, Hideki; Abe, Masahiko; Kitamoto, Daï; Imura, Tomohiro

doi:10.5650/jos.ess13138

Cited by 11 publications

(5 citation statements)

References 23 publications

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“…Moreover, it is abundantly produced by microorganisms such as Bacillus subtilis and also regarded as a promising environment-friendly surfactant (often called biosurfactant) that exhibits high biodegradability, in addition to high surface activity, unique self-assembling properties, and low http://dx.doi.org/10.1016/j.colsurfb.2015.06.034 0927-7765/© 2015 Elsevier B.V. All rights reserved. toxicity [15][16][17][18][19]. It is reported that SF micelles can bind divalent heavy metal ions (Cu 2+ and Zn 2+ ), and can remove the elements from contaminated soils using the membrane filtration technique [20].…”

Section: Introductionmentioning

confidence: 99%

Selective encapsulation of cesium ions using the cyclic peptide moiety of surfactin: Highly efficient removal based on an aqueous giant micellar system

Taira

Yanagisawa

Nagano

et al. 2015

Colloids and Surfaces B: Biointerfaces

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Section: Introductionmentioning

confidence: 99%

Selective encapsulation of cesium ions using the cyclic peptide moiety of surfactin: Highly efficient removal based on an aqueous giant micellar system

Taira

Yanagisawa

Nagano

et al. 2015

Colloids and Surfaces B: Biointerfaces

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“…When SF is adsorbed at the air–water interface, the alkyl chain is directed out of water and the cyclicpeptide moiety is directed into water. Previously, we have reported that an SF monolayer exhibited a liquid expanded monolayer at the air–water interface, demonstrating that the SF is in a loose molecular packing state owing to its bulky heptapeptide ring [ 24 ]. When the interface is completely occupied by SF, the excess molecules of SF start to aggregate into micelles.…”

Section: Resultsmentioning

confidence: 99%

Solubilization of Phospholipid by Surfactin Leading to Lipid Nanodisc and Fibrous Architecture Formation

Imura,

Yanagisawa,

Ikeda

et al. 2024

Molecules

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Nanodiscs belong to a category of water-soluble lipid bilayer nanoparticles. In vivo nanodisc platforms are useful for studying isolated membrane proteins in their native lipid environment. Thus, the development of a practical method for nanodisc reconstruction has garnered consider-able research interest. This paper reports the self-assembly of a mixture of bio-derived cyclic peptide, surfactin (SF), and l-α-dimyristoylphosphatidylcholine (DMPC). We found that SF induced the solubilization of DMPC multilamellar vesicles to form their nanodiscs, which was confirmed by size-exclusion chromatography, dynamic light scattering, and transmission electron microscopy analyses. Owing to its amphiphilic nature, the self-assembled structure prevents the exposure of the hydrophobic lipid core to aqueous media, thus embedding ubiquinol (CoQ10) as a hydrophobic model compound within the inner region of the nanodiscs. These results highlight the feasibility of preparing nanodiscs without the need for laborious procedures, thereby showcasing their potential to serve as promising carriers for membrane proteins and various organic compounds. Additionally, the regulated self-assembly of the DMPC/SF mixture led to the formation of fibrous architectures. These results show the potential of this mixture to function as a nanoscale membrane surface for investigating molecular recognition events.

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“…Apart from its very low CMC, surfactin has very low surface tension (27.2 mN/m at 2.7 × 10 –2 mmol/L), which indicates that this compound has high adsorbability to oil/water interfaces. This characteristic of surfactin was attributed to the formation of a β-sheet structure via hydrogen-bonding interaction as a result of the ring structure of the hydrophilic part. , The different behavior in region III shown in Figure could be explained in terms of the high adsorbability of surfactin as compared to SDS. With the aim to quantify this adsorbability, the amount of unadsorbed emulsifier was measured by 1 H NMR in D 2 O dispersing PS particles prepared by soap-free emulsion polymerization.…”

Section: Resultsmentioning

confidence: 99%

Emulsion Polymerization with a Biosurfactant

et al. 2017

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Emulsion polymerization of styrene was conducted using a biosurfactant (i.e., sodium surfactin, hereinafter called just "surfactin") having very low critical micelle concentration (CMC, 2.9 × 10 mmol/L) and biodegradability characteristics. The nucleation mechanism was investigated by comparing with a conventional surfactant (i.e., sodium dodecyl sulfate) system. Unlike the emulsion polymerization systems using conventional surfactants, nucleation mechanisms changed above CMC in the presence of a biosurfactant. At low concentrations of surfactin (above CMC), the polystyrene (PS) particles are likely generated via a soap-free emulsion polymerization mechanism. In contrast, at high surfactin concentrations, the PS particles would be synthesized by following a micellar nucleation mechanism. However, the slope (0.23) of the log N versus log C plot (N: number of particles; C: concentration of surfactin) did not obey the Smith-Ewart theory (0.6), this probably being produced by the high adsorbability of surfactin.

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Monolayer Behavior of Cyclic and Linear Forms of Surfactins: Thermodynamic Analysis of Langmuir Monolayers and AFM Study of Langmuir-Blodgett Monolayers

Cited by 11 publications

References 23 publications

Selective encapsulation of cesium ions using the cyclic peptide moiety of surfactin: Highly efficient removal based on an aqueous giant micellar system

Selective encapsulation of cesium ions using the cyclic peptide moiety of surfactin: Highly efficient removal based on an aqueous giant micellar system

Solubilization of Phospholipid by Surfactin Leading to Lipid Nanodisc and Fibrous Architecture Formation

Emulsion Polymerization with a Biosurfactant

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