Monolayer Behavior of Binary Systems of Lactonic and Acidic Forms of Sophorolipids: Thermodynamic Analyses of Langmuir Monolayers and AFM Study of Langmuir^|^ndash;Blodgett Monolayers

Imura, Tomohiro; Kawamura, Daisuke; Taira, Toshiaki; Morita, Tomotake; Fukuoka, Tokuma; Aburai, Kenichi; Sakai, Hideki; Abe, Masahiko; Kitamoto, Daï

doi:10.5650/jos.ess13047

Cited by 9 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lactone-form sophorolipid CMC 5.8 10 5 M, γCMC 35 mN/m LSL, Fig. 1c was prepared from olive oil by Starmerella bombicola NBRC 10243 22 . Acid-form sophorolipid CMC 1.7 10 4 M, γCMC 39.8 mN/m ASL, Fig.…”

Section: Experimental Procedures 21 Materialsmentioning

confidence: 99%

Application of Glycolipid Biosurfactants as Surface Modifiers in Bioplastics

et al. 2018

Self Cite

View full text Add to dashboard Cite

INTRODUCTION Biosurfactants BSs are functional amphiphilic compounds produced by a variety of microorganisms. Compared to chemically synthesized surfactants, BSs are more eco-friendly, biocompatible, and multifunctional. Glycolipid-type BSs are the most promising BSs for many industrial processes because of their availability from renewable resources, such as vegetable oils and sugars, and their versatile interfacial and biochemical properties 1, 2. Sophorolipids SL are a class of glycolipid-type BSs that can be easily mass produced 3. Starmerella bombicola is a high-yield producer of SL over 400 g/L 4 6. Naturally synthesized SL are mixtures of lactonic and acidic forms with a content ratio that depends on the specific species of the producers. SL are surface-active and exhibit low toxicity, high biodegradability, and antimicrobial properties. Many are currently used as additives in cleaning products and cosmetics 7, 8. Mannosylerythritol lipids MEL are also produced by fungal strains of the genus Pseudozyma or Ustilago 9, 10. MEL also boast excellent interfacial properties, specific self-assembly, and a variety of biological activities 1 .

show abstract

Section: Experimental Procedures 21 Materialsmentioning

confidence: 99%

Application of Glycolipid Biosurfactants as Surface Modifiers in Bioplastics

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Sophorolipids (SLs) are amphiphilic molecules with a hydrophilic sophorose head, consisting of two β-1,2 linked glucose molecules, and a hydrophobic fatty acid tail. The SLs produced by S. bombicola are typically a mixture of several slightly different congeners providing each of them with specific properties [3][4][5][6][7][8]. For example, SL molecules with a free carboxylic group are called acidic SLs and have good solubility in water.…”

Section: Introductionmentioning

confidence: 99%

Elucidation of the Natural Function of Sophorolipids Produced by Starmerella bombicola

Clercq

Roelants

Castelein

et al. 2021

JoF

View full text Add to dashboard Cite

The yeast Starmerella bombicola distinguishes itself from other yeasts by its potential of producing copious amounts of the secondary metabolites sophorolipids (SLs): these are glycolipid biosurfactants composed out of a(n) (acetylated) sophorose moiety and a lipid tail. Although SLs are the subject of numerous research papers and have been commercialized, e.g., in eco-friendly cleaning solutions, the natural function of SLs still remains elusive. This research article investigates several hypotheses for why S. bombicola invests that much energy in the production of SLs, and we conclude that the main natural function of SLs in S. bombicola is niche protection: (1) the extracellular storage of an energy-rich, yet metabolically less accessible carbon source that can be utilized by S. bombicola upon conditions of starvation with (2) antimicrobial properties. In this way, S. bombicola creates a dual advantage in competition with other microorganisms. Additionally, SLs can expedite growth on rapeseed oil, composed of triacylglycerols which are hydrophobic substrates present in the yeasts’ environment, for a non-SL producing strain (Δcyp52M1). It was also found that—at least under lab conditions—SLs do not provide protection against high osmotic pressure prevalent in sugar-rich environments such as honey or nectar present in the natural habitat of S. bombicola.

show abstract

“…The scarce information in the literature on the antimicrobial behaviour of binary systems involving biosurfactants is mainly limited to their physico-chemical properties [31,32], demonstrating the synergic effect between rhamnolipids and nisin, an antimicrobial peptide, which enhanced the effectiveness against L. monocytogenes [33].…”

Section: Size and Zeta Potentialmentioning

confidence: 99%