Nonionic Surfactants
Mostrando 1-12 de 67 artigos, teses e dissertações.
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1. Efficient Encapsulation and Controlled Release of N,N-Diethyl-3-methylbenzamide (DEET) from Oil-in-Water Emulsions Stabilized by Cationic Nanocellulose and Silica Nanoparticles
Oil-in-water emulsions containing N,N-diethyl-3-methylbenzamide (DEET) were developed aiming to extend the sustained release of the active compound, by using two oppositely charged nanomaterials, namely silica nanoparticles (SiNP) and cationic cellulose nanofibrils (CCNF), as stabilizers, and a mixture of food-grade nonionic surfactants to avoid precipitatio
Journal of the Brazilian Chemical Society. Publicado em: 2023
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2. Identification of Ethyl and t-Butyl Glyceryl Ethers Using Gas Chromatography Coupled with Mass Spectrometry
The ethers produced through the etherification reaction of glycerol with ethanol or t-butanol are used as oxygenated fuel additives, intermediates in the pharmaceutical industry, and non-ionic surfactants. However, the identification of these ethers has not been accurately done, because only some mass spectra of these compounds are available in the libraries
J. Braz. Chem. Soc.. Publicado em: 2018-06
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3. Utilization of dynamic light scattering to evaluate Pterodon emarginatus oleoresin-based nanoemulsion formation by non-heating and solvent-free method
Abstract Pterodon emarginatus Vogel, Fabaceae, is a great source of bioactive compounds. The most known and studied herbal derivative from this species is an ambar-colored oleoresin that contains vouacapane diterpenes and volatile terpenoids, such as β-caryophyllene. Some recent papers aimed to generate nanoemulsions using this oleoresin for biological appl
Rev. bras. farmacogn.. Publicado em: 2017-06
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4. Ligninolytic fungus Polyporus sp. S133 mediated metabolic degradation of fluorene
ABSTRACT This study aimed to investigate the impact of nonionic surfactants on the efficacy of fluorine degradation by Polyporus sp. S133 in a liquid culture. Fluorene was observed to be degraded in its entirety by Polyporus sp. S133 subsequent to a 23-day incubation period. The fastest cell growth rate was observed in the initial 7 days in the culture that
Braz. J. Microbiol.. Publicado em: 2016-09
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5. Effect of surfactants and temperature on germination and vegetative growth of Beauveria bassiana
Three non-ionic surfactants: Tween20, Tween80 and Breakthru® were screened for their effects on spore germination and mycelial growth rates and for their influence on three isolates of Beauveria bassianaspore germination at various temperatures. Tween20 and Tween80 were compatible with all the B. bassiana isolates in the germination studies, but inhibited g
Braz. J. Microbiol.. Publicado em: 2015-03
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6. Cloning and characterization of newly isolated lipase from Enterobacter sp. Bn12
A mesophilic Enterobacter sp. Bn12 producing an alkaline thermostable lipase was isolated from soil in Tehran, Iran. The lipase gene (ELBn12) was identified from a genomic library. Sequence analysis of the DNA fragment revealed an open reading frame of 879 bp encoding a lipase with a molecular mass of 31.3 kDa. The deduced amino acid sequence showed 96% iden
Braz. J. Microbiol.. Publicado em: 2014-06
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7. Optimization and characterization of alkaline protease and carboxymethyl-cellulase produced by Bacillus pumillus grown on Ficus nitida wastes
The potentiality of 23 bacterial isolates to produce alkaline protease and carboxymethyl-cellulase (CMCase) on Ficus nitida wastes was investigated. Bacillus pumillus ATCC7061 was selected as the most potent bacterial strain for the production of both enzymes. It was found that the optimum production of protease and CMCase were recorded at 30 °C, 5% Ficus n
Braz. J. Microbiol.. Publicado em: 30/08/2013
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8. Novos tensoativos não-iônicos para CO2-supercrítico: síntese e estudo de algumas propriedades / New nonionic surfactants for supercritical CO2: synthesis and study of some properties
O CO2 supercrítico (CO2-sc) é um bom solvente para substâncias apolares e pouco polares de baixa massa molecular. A fim de tornar este meio um melhor solvente para uma gama maior de substâncias, desenvolvemos 8 novos tensoativos, sendo seis derivados de açúcares (N-metil-D-glucamina, 2-D-Glucosamina e Sorbitano) e três derivados de óleos vegetais (li
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/05/2012
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9. Aplicação das relações lineares de energia livre de solvatação (LSER) ao estudo de sistemas interfaciais organizados / Application of linear solvation energy relationships (LSER) to the study of organized interfacial systems
Neste estudo foi caracterizado o processo de solubilização de solutos neutros em sistemas micelares compostos de surfactantes não iônicos da família de alcoóis secundários etoxilados com o mesmo grupo hidrofóbico e graus diferentes de etoxilação, variando de 5 a 30 subunidades de oxido de etileno. Para isso, foram utilizadas as Relações Lineares
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/10/2011
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10. Interaction between cationic and conventional nonionic surfactants in the mixed micelle and monolayer formed in aqueous medium
Mixed micellization and surface properties of cationic and nonionic surfactants dimethyl decyl-, tetradecyl- and hexadecyl phosphineoxide mixtures are studied using conductivity and surface tension measurements. The models of Rubingh, Rosen, and Clint, are used to obtain the interaction parameter, minimum area per molecule, mixed micelle composition, free en
Química Nova. Publicado em: 2011
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11. Autoassociação de misturas dos Surfactantes Dodecanoato de Sódio (SDoD) e Decanoato de Sódio (SDeC) com o Polímero Hidrofobicamente Modificado Etil(Hidroxietil)Celulose (EHEC)
In this work, the interactions between the non-ionic polymer of ethyl(hydroxyethyl)cellulose (EHEC) and mixed anionic surfactant sodium dodecanoate (SDoD)-sodium decanoate (SDeC) in aqueous media, at pH 9.2 (20 mM borate/NaOH buffer) were investigated by electric conductivity and light transmittance measurements at 25 ºC. The parameters of the surfactant to
Química Nova. Publicado em: 2011
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12. Nanoemulsões óleo de laranja/água preparadas em homogeneizador de alta pressão
The objective of this work was to use the high-pressure homogenizer (HPH) to prepare stable oil/water nanoemulsions presenting narrow particle size distribution. The dispersions were prepared using nonionic surfactants based on ethoxylated ether. The size and distribution of the droplets formed, along with their stability, were determined in a Zetasizer Nano
Química Nova. Publicado em: 2010