MALDI-TOF mass spectrometry of naturally occurring mixtures of monorhamnolipids and dirhamnolipids

Price, Neil P. J.; Ray, Karen; Vermillion, Karl E.; Kuo, Tsung Min

doi:10.1016/j.carres.2008.10.013

Cited by 55 publications

(45 citation statements)

References 24 publications

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“…2). The spectrum is in agreement with results obtained by other researchers, which indicates the same characteristics of rhamnolipid biosurfactant (Price et al 2009;Raza et al 2009;Monteiro et al 2007). …”

Section: Resultssupporting

confidence: 94%

Biosurfactant production by Pseudomonas aeruginosa DSVP20 isolated from petroleum hydrocarbon-contaminated soil and its physicochemical characterization

Sharma

Ansari

Al-Ghamdi

et al. 2015

Environ Sci Pollut Res

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Among 348 microbial strains isolated from petroleum hydrocarbon-contaminated soil, five were selected for their ability to produce biosurfactant based on battery of screening assay including hemolytic activity, surface tension reduction, drop collapse assay, emulsification activity, and cell surface hydrophobicity studies. Of these, bacterial isolate DSVP20 was identified as Pseudomonas aeruginosa (NCBI GenBank accession no. GQ865644) based on biochemical characterization and the 16S rDNA analysis, and it was found to be a potential candidate for biosurfactant production. Maximum biosurfactant production recorded by P. aeruginosa DSVP20 was 6.7 g/l after 72 h at 150 rpm and at a temperature of 30 °C. Chromatographic analysis and high-performance liquid chromatography-mass spectrometry (HPLC-MS) revealed that it was a glycolipid in nature which was further confirmed by nuclear magnetic resonance (NMR) spectroscopy. Bioremediation studies using purified biosurfactant showed that P. aeruginosa DSVP20 has the ability to degrade eicosane (97%), pristane (75%), and fluoranthene (47%) when studied at different time intervals for a total of 7 days. The results of this study showed that the P. aeruginosa DSVP20 and/or biosurfactant produced by this isolate have the potential role in bioremediation of petroleum hydrocarbon-contaminated soil.

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Section: Resultssupporting

confidence: 94%

Biosurfactant production by Pseudomonas aeruginosa DSVP20 isolated from petroleum hydrocarbon-contaminated soil and its physicochemical characterization

Sharma

Ansari

Al-Ghamdi

et al. 2015

Environ Sci Pollut Res

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“…(19). Monorhamnolipid (RL-1) (a) and dirhamnolipid (RL-2) (b) produced from Pseudomonas aeruginosa bacteria [78].…”

Section: Biofrothersmentioning

confidence: 99%

Flotation Frothers: Review of Their Classifications, Properties and Preparation

Khoshdast¹

2011

TOMPJ

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Abstract:The importance of frothers in flotation is widely acknowledged, particularly in terms of their role with respect to bubble size, and the stability and mobility of the froth phase. These factors play a significant role in the kinetic viability of the process, and the overall recovery and the grade that can be achieved from a flotation cell or circuit. About 60 years ago, Wrobel [1] presented a comprehensive review of flotation frothers, their action, properties and structures. However, during recent six decades flotation reagent technology has undergone considerable evolutions and innovations. The aim of the present review is to provide an updated, comprehensive database comprising recent developments in flotation frother technology as well as some historical aspects. Different types of flotation frothers are discussed regarding to their classifications, properties, and preparation methods. New classification schemes have been suggested in parallel with introducing new characterization criteria. New classes of frothers are actually conventional frothers modified by incorporating certain functional "group" or "atoms" into their molecular structure. Like particle surface modifiers, frothers are also influenced by biotechnology, leading to introducing a new class of frothers named as "biofrothers".

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“…43 Matrix assisted laser desorption ionization-time of flight MS (MALDI-TOF MS) approaches were recently developed for high-throughput screening of naturally occurring mixtures of RLs from Pseudomonas spp. 58 …”

Section: Identification and Quantificationmentioning

confidence: 97%

“…These methods range from indirect analysis based on the physical properties of RLs (determination of surface tension and hemolytic test), 29,54 colorimetric measurement (cetyltrimethylammonium bromide agar test, anthrone method and orcinol test) [54][55][56] to spectroscopic analysis of sample structure by infrared and nuclear magnetic resonance spectroscopy and a sophisticated analysis of composition by mass spectrometry (MS). 34,43,46,57,58 One current method for RL identification and quantification is high performance liquid chromatography (HPLC) analysis coupled with electrospray ionization mass spectrometry (ESI-MS). 33,34,43,53,57 Furthermore, fragmentation of the pseudomolecular ion using tandem MS analysis of the parent ion is often performed in order to provide additional structural information, such as discrimination of isomeric pairs with subtle structural variations.…”

Section: Identification and Quantificationmentioning

confidence: 99%

Rhamnolipid biosurfactant from Pseudomonas aeruginosa: From discovery to application in contemporary technology

2015

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The rhamnolipids will most likely be the next generation of biosurfactants to reach the market. They should follow closely after alkyl polyglycosides, already established in the biosurfactants market, and sophorolipids, which can be found in several cleaning agents. However, the greatest numbers of recent publications and patents among glycolipid biosurfactants have been dedicated to rhamnolipids. Produced mainly by Pseudomonas aeruginosa, rhamnolipids are mixtures of different rhamnolipid congeners, which show physico-chemical properties that differ from those of single congeners, with the most abundant structure in the mixture having the largest impact on the overall characteristics of the total mixture. Characteristics of biodegradability, low toxicity, production from renewable sources and antimicrobial (particularly antifungal) activity together make rhamnolipid biosurfactants particularly promising for broad commercial application. Although to date, bioremediation has been the major topic filed for patents utilizing rhamnolipids, the increasing number of patents for applications in cosmetics, agronomy and food industries, formulation of cleaners and nanotechnology indicates their future implementation in these fields.

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MALDI-TOF mass spectrometry of naturally occurring mixtures of monorhamnolipids and dirhamnolipids

Cited by 55 publications

References 24 publications

Biosurfactant production by Pseudomonas aeruginosa DSVP20 isolated from petroleum hydrocarbon-contaminated soil and its physicochemical characterization

Biosurfactant production by Pseudomonas aeruginosa DSVP20 isolated from petroleum hydrocarbon-contaminated soil and its physicochemical characterization

Flotation Frothers: Review of Their Classifications, Properties and Preparation

Rhamnolipid biosurfactant from Pseudomonas aeruginosa: From discovery to application in contemporary technology

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