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A new biosurfactant produced by Candida glabrata UCP 1002: characteristics of stability and application in oil recovery BABT
Luna,Juliana Moura de; Sarubbo,Leonie; Campos-Takaki,Galba Maria de.
The production of a new biosurfactant by Candida glabrata UCP1002 was studied to evaluate the influence of the concentration of the cotton seed oil, glucose and yeast extract. The dynamics of the growth and surfactant production were showed for all the cultivation conditions studied. The best emulsification of the n-hexadecane, quantified by the emulsifying index was observed in the medium containing 7.5% cotton seed oil, 5% glucose and 0.3% yeast extract. The isolated biosurfactant showed a CMC of 2.5% and the surface tension at that point showed to be 31mN/m. The potential application of the biosurfactant in oil recovery from the sand, in acid and alkaline environments and over exposure to high salinity and different temperatures was demonstrated by the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biosurfactant; Candida glabrata; Surface tension; Stability; Cotton seed oil; Oil removal.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400001
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Characterization and properties of the biosurfactant produced by Candida lipolytica UCP 0988 Electron. J. Biotechnol.
Diniz Rufino,Raquel; Moura de Luna,Juliana; de Campos Takaki,Galba Maria; Asfora Sarubbo,Leonie.
Background: Biotechnological processes are costly, especially for the production of biosurfactants. The successful production of a biosurfactant is dependent on the development of processes using low cost raw materials. Considering the importance of the characteristics of a biosurfactant to facilitate its industrial application, the properties of the biosurfactant produced by Candida lipolytica through previously optimized medium have been established. Results: The yeast was grown for 72 h to determine the kinetics of growth and production. The surface tension of the cell-free broth was reduced from 55 to 25 mN/m. The yield of biosurfactant was 8.0 g/l with a CMC of 0.03%. The biosurfactant was characterized as an anionic lipopeptide composed of 50%...
Tipo: Journal article Palavras-chave: Biosurfactant; Candida lipolytica; Lipopeptide; Surface tension; Toxicity.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100006
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Droplet deposition during spray and leaf pH in aquatic weed control Scientia Agricola
Costa,Neumárcio Vilanova da; Martins,Dagoberto; Rodella,Roberto Antonio; Costa,Lívia Duarte Neves de Camargo da.
The morphological diversity of leaf surface and structures such as trichomes, stomata, cuticle, and waxes that exists among plant species can have great influence on the adherence and deposition of spray droplets, as well as on herbicide absorption. The aim of this research was to study leaf pH and to evaluate wetting areas after applications of solution surfactants on the following aquatic weeds: Enhydra anagallis, Eichhornia crassipes, Heteranthera reniformis, and Typha subulata. The aquatic weeds were grown in reservoirs containing water under open air conditions and their leaf tissues were collected when the plants reached full development (before flowering). The mean leaf pH varied between 5.50 and 7.50; E. anagallis should be pointed out for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic weed; Glyphosate; Surface tension; Wetting.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000300005
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Effect of adjuvants on the amount of air included in droplets generated by spray nozzles REA
Mota,Alisson A. B.; Antuniassi,Ulisses R.; Chechetto,Rodolfo G.; Oliveira,Rone B. de; Silva,Anne C. A. e.
The air included in droplets generated by spray nozzles directly int0erferes in transport, deposition and retention of the droplets after its impact on the target. The objective of this study was to analyze the interference of adjuvants in the amount of air included in droplets generated by spray nozzles. The treatments were composed by four spray solutions containing mineral oil, vegetable oil, surfactant and water, and three spray nozzles, two air induction type and one pre-orifice. The air included was calculated by the difference between the volume of spray mix (air plus liquid) and only the liquid, which was made by means of sprayed samples captured in a funnel and collected in a graduated cylinder. The surface tension was estimated by the gravimetric...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Application technology; Air induction; Pre-orifice; Surface tension.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600020
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Floating Macrophyte Control with Glyphosate According to Adjuvants and Spray Nozzles Planta Daninha
SILVA,A.F.; CERVEIRA JR,W.R.; FERREIRA,M.C.; CRUZ,C..
ABSTRACT: The goals of this study were to evaluate the application of glyphosate plus three adjuvants and three spray nozzles in controlling the macrophyte Pistia stratiotes. For this purpose, after an 80 to 90% colonization, the application of 1.5, 3.5 and 7.0 L h-1 of isolated glyphosate and with the adjuvants Aterbane® BR, Veget’oil® and Dash® HC (0.5% vv-1) and the spray nozzles (AI 110.02, TTI 110.015 and TT 110.015) was performed, plus a control sample (water). Applications were performed with a pressurized backpack precision sprayer, at the constant pressure of 50 p.s.i. and with mixture consumption of 200 L ha-1. At the dose of 1.5 L ha-1, there was 100% control for the combination glyphosate + Veget’oil + tip AI 110.02 (Gly+V.oil+AI,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pistia stratiotes; Application technology; Effectiveness; Surface tension; Contact angle.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100227
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INFLUENCE OF GLYPHOSATE CONCENTRATIONS ON SPRAY SOLUTION PHYSICOCHEMICAL CHARACTERISTICS AND DRIFT POTENTIAL REA
Almeida,Dieimisson P.; Ferreira,Marcelo da C.; Santos,Renata T. da S.; Griesang,Fabiano; Santos,Eduardo de S. dos; Timossi,Paulo C..
ABSTRACT The herbicide glyphosate is sprayed with varying application volumes that result in different concentrations used in the spray solutions. Thus, this study aimed to evaluate the effect of glyphosate concentrations on the potential risk of droplet drift, surface tension of spray solution, and contact angle of droplets on surfaces. Three experiments were conducted in a completely randomized design. Drift potential was evaluated by median volumetric diameter (MVD), percentage volume of droplets with diameter smaller than 100 μm (%V<100 μm), and coefficient of uniformity (Span), with 12 replications. The surface tension of spray solutions and contact angle of droplets were evaluated on Urochloa ruziziensis leaves, paraffin film, and glass, with four...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Surface tension; Contact angle; Droplets; MVD; Congo grass.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000100069
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Physical characteristics of oily spraying liquids and droplets formed on coffee leaves and glass surfaces REA
Decaro Junior,Sergio T.; Ferreira,Marcelo da C.; Lasmar,Olinto.
The physical characteristics of a spray liquid are important in getting a good droplet formation and control efficiency over a particular target. As a function of these characteristics, it is possible to decipher which is the best adjuvant based on the respective concentration used during the spray. Therefore, ten spraying liquids were prepared, which varied in concentrations of pesticide lufenuron + profenofos, mineral oil, water and manganese sulfate. Pendant droplets formed from these mixtures were measured to examine their impact on surface tension. Droplets were applied to the surface of coffee leaves and the surface tension, contact angle formed and the leaf area wetted by the droplet, were measured. A smooth glass surface was taken as a comparative...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Surface tension; Contact angle; Wetted area; Oil.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000300588
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Production and characterization of a biosurfactant produced by Streptomyces sp. DPUA 1559 isolated from lichens of the Amazon region BJMBR
Santos,A.P.P.; Silva,M.D.S.; Costa,E.V.L.; Rufino,R.D.; Santos,V.A.; Ramos,C.S.; Sarubbo,L.A.; Porto,A.L.F..
Surfactants are amphipathic compounds containing both hydrophilic and hydrophobic groups, capable to lower the surface or interfacial tension. Considering the advantages of the use of biosurfactants produced by microorganisms, the aim of this paper was to develop and characterize a biosurfactant produced by Streptomyces sp. DPUA1559 isolated from lichens of the Amazon region. The microorganism was cultured in a mineral medium containing 1% residual frying soybean oil as the carbon source. The kinetics of biosurfactant production was accompanied by reducing the surface tension of the culture medium from 60 to values around 27.14 mN/m, and by the emulsification index, which showed the efficiency of the biosurfactant as an emulsifier of hydrophobic compounds....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biosurfactant; Surface tension; Emulsification; Streptomyces; Soybean frying oil.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000200606
Registros recuperados: 8
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