Biosurfactants

Zajic, J. E.; Seffens, William; Panchal, Chandra J.

doi:10.3109/07388558309082580

Cited by 125 publications

(67 citation statements)

References 87 publications

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“…Biosurfactants are microbial compounds that exhibit pronounced surface activity, such as surface and interfacial tension reductions, which could have major consequences for bacterial adhesion. The cell itself, which is composed of a mosaic of hydrophobic and hydrophilic moieties, can be considered to be a biosurfactant (52). If cells slip on the electrode due to biosurfactants, a decrease in decay length results in an increase in frequency and therefore a positive ⌬ƒ shift (48).…”

Section: Discussionmentioning

confidence: 99%

Use of a Quartz Crystal Microbalance To Investigate the Antiadhesive Potential of N -Acetyl- l -Cysteine

Olofsson

Hermansson

Elwing

2005

Appl Environ Microbiol

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The reduction of bacterial biofilm formation on stainless steel surfaces by N-acetyl-L-cysteine (NAC) is attributed to effects on bacterial growth and polysaccharide production, as well as an increase in the wettability of steel surfaces. In this report, we show that NAC-coated stainless steel and polystyrene surfaces affect both the initial adhesion of Bacillus cereus and Bacillus subtilis and the viscoelastic properties of the interaction between the adhered bacteria and the surface. A quartz crystal microbalance with dissipation was shown to be a powerful and sensitive technique for investigating changes in the applied NAC coating for initial cell surface interactions of bacteria. The kinetics of frequency and dissipation shifts were dependent on the bacteria, the life cycle stage of the bacteria, and the surface. We found that exponentially grown cells gave rise to a positive frequency shift as long as their cell surface hydrophobicity was zero. Furthermore, when the characteristics of binding between the cell and the surface for different growth phases were compared, the rigidity increased from exponentially grown cells to starved cells. There was a trend in which an increase in the viscoelastic properties of the interaction, caused by the NAC coating on stainless steel, resulted in a reduction in irreversibly adhered cells. Interestingly, for B. cereus that adhered to polystyrene, the viscoelastic properties decreased, while there was a reduction in adhered cells, regardless of the life cycle stage. Altogether, NAC coating on surfaces was often effective and could both decrease the initial adhesion and increase the detachment of adhered cells and spores. The most effective reduction was found for B. cereus spores, for which the decrease was caused by a combination of these two parameters.Bacteria commonly adhere to a surface and are part of a complex biofilm. Since the growth of biofilms causes enormous economic losses and health problems in industrial systems like food and paper production, huge efforts are made to solve this problem. The adhesion of bacteria to surfaces is a complex interplay of physical, chemical, and biological factors (5), and there are large variations in the adhesion behaviors of different bacteria and also for different life cycle stages of one strain (41). It is very important to consider these differences when antiadhesion coatings are developed. It is generally thought that bacterial adhesion is preceded by the adsorption of a conditioning layer of molecules that influence adhesion of bacteria to surfaces (43). A good antiadhesion coating should form a conditioning film that prevents adhesion and has a low cohesive strength, making a weak bond between the biofilm and the surface (6). One such agent may be N-acetyl-L-cysteine (NAC). NAC is commonly used in medical treatment of chronic bronchitis and cancer (38,46) and is one of the smallest drug molecules in use (30). Moreover, we recently demonstrated that NAC affects several processes that are important for bacterial biofilm fo...

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Section: Discussionmentioning

confidence: 99%

Use of a Quartz Crystal Microbalance To Investigate the Antiadhesive Potential of N -Acetyl- l -Cysteine

Olofsson

Hermansson

Elwing

2005

Appl Environ Microbiol

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“…Os biossurfactantes, de modo geral, podem ser classificados em: glicolipídeos, lipossacarídeos, lipopeptídeos, fosfolipídeos e ácidos graxos/lipídeos neutros (como os ácidos ustilágico e corinomicólico) 15 , além de surfactantes poliméricos e surfactantes particulados 16 , sendo os lipopeptídeos os biossurfactantes mais efetivos 15 . Os surfactantes lipoprotéicos são talvez os mais conhecidos por suas atividades antibióticas, sendo melhor caracterizados aqueles produzidos por Bacillus sp, incluindo surfactina, iturina, fengicina, liquenisina 8 , micosubtilisina e bacilomicina 17 .…”

Section: Introductionunclassified

Surfactina: propriedades químicas, tecnológicas e funcionais para aplicações em alimentos

Barros¹,

Quadros²,

Júnior³

et al. 2007

Quím. Nova

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Recebido em 11/11/05; aceito em 31/5/06; publicado na web em 19/1/07 SURFACTIN: CHEMICAL, TECHNOLOGICAL AND FUNCTIONAL PROPERTIES FOR FOOD APPLICATIONS. Surfactin, a lipopeptide produced by strains of Bacillus subtilis, has been proved to be a suitable biosurfactant in several applications. For many years, it has been investigated mainly for oil recovery and environmental usage. Its chemical, technological and functional characteristics turn surfactin into an attractive compound for several utilizations. In this review we emphasize some aspects of surfactin as a new food ingredient and its potential pharmaceutical and health applications.Keywords: surfactin; food ingredients; pharmaceutical applications. INTRODUÇÃOSurfactante é uma palavra derivada da contração da expressão "surface active agent", termo que significa, literalmente, agente de atividade superficial. Em outras palavras, surfactante é um composto caracterizado pela capacidade de alterar as propriedades superficiais e interfaciais de um líquido 1,2 . O termo interface denota o limite entre duas fases imiscíveis, enquanto o termo superfície indica que uma das fases é gasosa 1 . Outra propriedade fundamental dos surfactantes é a tendência de formar agregados chamados micelas que, geralmente, se formam a baixas concentrações em água. A concentração mínima na qual se inicia a formação de micelas chama-se concentração micelar crítica (CMC), sendo uma importante característica de um surfactante 1 . Estas propriedades tornam os surfactantes adequados para uma ampla gama de aplicações industriais envolvendo: detergência, emulsificação, lubrificação, capacidade espumante, capacidade molhante, solubilização e dispersão de fases 3 .A produção mundial de surfactantes excede 3 milhões de t/ano sendo que sua utilização se concentra nas indústrias de petróleo, de cosméticos, de produtos de higiene e de limpeza 3 , sendo que este último é o setor que utiliza a maior parte dos surfactantes produzidos como matéria-prima para fabricação de detergentes de uso doméstico 4 .A grande maioria dos surfactantes disponíveis comercialmente é sintetizada a partir de derivados de petróleo. Entretanto, o aumento da preocupação ambiental entre os consumidores, combinado com novas legislações de controle do meio ambiente levou à procura por surfactantes naturais como alternativa aos produtos existentes 4 .Compostos de origem microbiana que exibem atividade superficial são denominados biossurfactantes, consistindo em subprodutos de seus respectivos sistemas metabólicos 5 . Nas últimas décadas, diversos microrganismos têm sido relatados como produtores de vários tipos de surfactantes. A biodegradabilidade 6,7 e baixa toxicidade dos biossurfactantes constituem vantagens adicionais sobre os ingredientes sintéticos e, conseqüentemente, tornam-se substitutos dos emulsificantes convencionais em alimentos e cosméticos 6 , originando maior apelo de mercado pelo fato desses produtos serem considerados naturais, além de apropriados para aplicação ambiental 7 .As bactérias, juntamente com as ar...

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“…Microbial compounds that alter the conditions prevailing at a surface or interface are often referred to as adjuvants, bioemulsifiers, or biosurfactants (5,14,51). A variety of microorganisms, including bacteria, fungi, and yeasts, have been reported to produce biosurfactants (16,36).…”

mentioning

confidence: 99%

Biochemical, Genetic, and Zoosporicidal Properties of Cyclic Lipopeptide Surfactants Produced by Pseudomonas fluorescens

Souza¹,

Boer²,

Waard

et al. 2003

Appl Environ Microbiol

211

187

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Biosurfactants

Cited by 125 publications

References 87 publications

Use of a Quartz Crystal Microbalance To Investigate the Antiadhesive Potential of N -Acetyl- l -Cysteine

Use of a Quartz Crystal Microbalance To Investigate the Antiadhesive Potential of N -Acetyl- l -Cysteine

Surfactina: propriedades químicas, tecnológicas e funcionais para aplicações em alimentos

Biochemical, Genetic, and Zoosporicidal Properties of Cyclic Lipopeptide Surfactants Produced by Pseudomonas fluorescens

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