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Journal ArticleDOI

Antimicrobial Effects of Biosurfactants

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TLDR
The studies indicated that the glycolipids are hydrolyzed by enzymatic reactions in the case of the Gram- negative bacterium Pseudomonas aeruginosa not inhibited by those surfactants, and that the Glykolipide hydrolysiert werden.
Abstract
Some biosurfactants possess antimicrobial properties. Gram-positive bacteria were more sensitive against the detergents than gram-negative bacteria, which were weakly or not inhibited. Especially sophoro- and rhamnolipids prevented the growth of Gram-positive bacteria; the conidia germination of the fungus Glomerella cingulata was influenced by sophoro-, rhamno-, trehalose- and cellobiose-lipids, resp. In the case of the Gram- negative bacterium Pseudomonas aeruginosa not inhibited by those surfactants, our studies indicated that the glycolipids are hydrolyzed by enzymatic reactions. Antimikrobielle Wirkung von Biotensiden Einige Biotenside besitzen antimikrobielle Eigenschaften. Gram-positive Bakterien waren starker sensitiv gegenuber diesen Detergentien als Gram-negative Bakterien, die nur schwach oder gar nicht inhibiert wurden. Insbesondere verhinderten Sophoro- und Rhamnolipide das Wachstum von Gram-positiven Bakterien; die Konidien-Keimung des Pilzes Glomerella cingulata wurde beeinflust durch Sophoro-, Rhamno-, Trehalose- und Cellobiose-Lipide. Am Beispiel des Gram-negativen Bakteriums Pseudomonas aeruginosa, welches durch diese Tenside nicht inhibiert worden war, konnte gezeigt werden, das uber enzymatische Reaktionen die Glykolipide hydrolysiert werden.

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Citations
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Journal ArticleDOI

Microbial production of surfactants and their commercial potential.

TL;DR: Biosurfactants are more effective, selective, environmentally friendly, and stable than many synthetic surfactants, and the most promising applications are cleaning of oil-contaminated tankers, oil spill management, transportation of heavy crude oil, enhanced oil recovery, recovery of crude oil from sludge, and bioremediation of sites contaminated with hydrocarbons, heavy metals, and other pollutants.
Journal ArticleDOI

Potential commercial applications of microbial surfactants.

TL;DR: Biosurfactants are amphiphilic compounds of microbial origin with considerable potential in commercial applications within various industries and have advantages over their chemical counterparts in biodegradability and effectiveness at extreme temperature or pH and in having lower toxicity.
Journal ArticleDOI

Rhamnolipids: diversity of structures, microbial origins and roles

TL;DR: A wide diversity of rhamnolipid congeners and homologues that are produced at different concentrations by various Pseudomonas species and by bacteria belonging to other families, classes, or even phyla are found.
Journal ArticleDOI

Microbial production and application of sophorolipids

TL;DR: An overview of the producing yeast strains and various aspects of fermentative sophorolipid production is given, and a summary is given on possible applications of sopharolipids, either as native or modified molecules.
Journal ArticleDOI

An update on the use of unconventional substrates for biosurfactant production and their new applications.

TL;DR: In this review, advances made in using renewable substrates for biosurfactant production and their newer applications are reported.
References
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Journal ArticleDOI

Microbial production, structure elucidation and bioconversion of sophorose lipids

TL;DR: A 17-hydroxyocta-decanoic acid at the C-1’ -position and acetate groups at the B-6’ and C-6' -positions of sophorose were found as substituents in the lactone and acidic forms of these lipids.
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Chemical and Physical Characterization of Interfacial-Active Lipids from Rhodococcus erythropolis Grown on n-Alkanes.

TL;DR: Lipophilic compounds of the culture suspension containing Rhodococcus erythropolis DSM43215 had surfactant properties when the bacteria were cultivated with n-alkanes as the sole carbon source and the interfacial properties were stabile in solutions with a wide range of pH and ionic strength.
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Rhamnolipids produced by Pseudomonas aeruginosa grown on n-paraffin (mixture of C 12 , C 13 and C 14 fractions).

TL;DR: Two kinds of glycolipids were produced in the culture media by several strains of Pseudomonas aeruginosa when grown on n paraffin and demonstrated mycoplasmacidal and antiviral activities in vitro.
Journal ArticleDOI

Formation, Isolation and Characterization of Trehalose Dimycolates from Rhodococcus erythropolis Grown on n-Alkanes

TL;DR: Rhodococcus erythropolis DSM 43215 produced a surface-active trehalose lipid whose formation was induced by n-alkanes to a maximum of 2.1 g l-1 in a 50 l batch culture on 2% (w/v) n-alksanes of chain length C12 to C18.
Journal ArticleDOI

Production of four interfacial active rhamnolipids from n-alkanes or glycerol by resting cells of Pseudomonas species DSM 2874.

TL;DR: Yields, which were comparable to those obtained on n-alkanes or glycerol, were found for stearic acid, fatty alcohols and vegetable oils, and a study of the time course of glycolipid production of resting cells was carried out in a 20 1- biorcactor with an intcnsor system and with n-tetradecane as the sole C-source.
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