Non Ionic Surfactants
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. 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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2. 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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3. 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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4. 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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5. Liquid - liquid extraction of matrine using TRPO/cyclohexane reverse micelles
Reverse micellar extraction has been widely used in the purification of biomolecules. However, reverse micelles formed by ionic surfactants can only be employed for the extraction of biomolecules that are charged in the extraction system with the electrostatic interaction between surfactants and solutes as the driving force. In this study, the extraction of
Brazilian Journal of Chemical Engineering. Publicado em: 2009-06
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6. The influence of ethoxylation degree in the behaviour of secondary alcohol ethoxylates / Influência do grau de etoxilação no comportamento de álcoois secunários etoxilados
The solubilization of non-ionic solutes via partitioning between water and the micellar pseudophase of non-ionic surfactants was evaluated for a series of secondary alcohol ethoxylates with hydrophile length varying from 7 to 40 ethylene oxide units. It was demonstrated that the micellar incorporation constant, Ks, is not dependent on the hydrophile length o
Publicado em: 2009
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7. CEFALOSPORINAS E SURFACTANTE NÃO-IÔNICO EM EFLUENTE HOSPITALAR: DETERMINAÇÃO, DEGRADAÇÃO POR MEIO DE FOTÓLISE E ELETROCOAGULAÇÃO E IDENTIFICAÇÃO DE SUBPRODUTOS E METABÓLITOS / CEFALOSPORINS AND NON IONIC SURFACTANTS IN HOSPITAL WASTEWATER: DETERMINATION, DEGRADATION BY MEANS OF PHOTOLYSIS AND ELECTROCOAGULATION AND IDENTIFICATION OF BYPRODUCTS AND METABOLITES
The currently incorrect and excessive consumption of pharmaceuticals and surfactants, mainly domestic usage, has become a concern to the scientific community around the world, due to the environmental consequences with regard to the bacterial resistance (characteristic of antibiotics), and alteration of hormonal systems (provoked by the degradation products
Publicado em: 2009
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8. Effect of surfactants and methodologic alterations in the rat inner mitochondrial membrane solubilization analysed by native and two dimensional electrophoresis / Efeito de surfatantes e modificações metodologicas na solubilização de membrana mitocondrial interna de ratos analisada por eletroforese nativa e bidimensional
The majority of the chemical energy produced inside aerobic cells is a result of the oxidative phosphorylation of ATP, inside the mitochondria. A great part of mitochondria proteins are organized into complexes located in the inner mitochondria membrane. Isolation and identification of those proteins have been conducted by electrophoresis, both in native as
Publicado em: 2008
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9. Monoglicerídeos: produção por via enzimática e algumas aplicações
Monoglycerides (MAG) are non-ionic surfactants, widely used in the pharmaceutical, food and cosmetic industries. Although MAGs are manufactured on an industrial scale by chemical glycerolysis of oils and fats, new developments in lipase catalyzed synthesis have been studied as an alternative to the classical method seeking to use clean technology and green c
Química Nova. Publicado em: 2008
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10. DESENVOLVIMENTO DE METODOLOGIA ANALITICA POR CROMATOGRAFIA/ESPECTROMETRIA DE MASSAS PARA AVALIAÇÃO DA OCORRÊNCIA DE PERTURBADORES ENDÓCRINOS EM MANANCIAIS DE ABASTECIMENTO DA REGIÃO METROPOLITANA DE BELO HORIZONTE
Some organic molecules classified as endocrine disrupters compounds (EDC) have been found in surface waters and attracted attention from the scientific community due to their hability to tamper with the endocrine system of aquatic fauna, hence due to the potential risk they pose to human health. Among the compunds with endocrine properties, the hormones (17&
Publicado em: 2008
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11. Drenagem de espumas gás-líquidos e influência da presença de partículas e anti-espumantes / Air-liquid foams drainage and influence of the presence of particles and antifoams
This Dissertation presents results of two comercial antifoams on the stability of gas-liquid foams formed in the presence of an anionic surfactant, a non-ionic surfactant and colloidal particles. Air-liquid foams are colloidal systems formed by air bubbles separated by liquid films. The drainage or flow of the liquid contained within these films pass through
Publicado em: 2007
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12. O pKa de indicadores ácido-base e os efeitos coloidais
An experiment is proposed that can be included in undergraduate courses of chemistry. The subject is the acidity of organic compounds, which are employed as pH indicators, particularly in acid-base titrations. The indicators used are methyl orange, bromophenol blue and bromocresol green in aqueous medium. The influence of colloidal systems on the equilibrium
Química Nova. Publicado em: 2006-06