Nonionic Surfactants
Mostrando 13-24 de 67 artigos, teses e dissertações.
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13. 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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14. 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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15. 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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16. 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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17. 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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18. Can affinity interactions influence the partitioning of glucose-6-phosphate dehydrogenase in two-phase aqueous micellar systems?
In this work, we provide an investigation of the role and strength of affinity interactions on the partitioning of the glucose-6-phosphate dehydrogenase in aqueous two-phase micellar systems. These systems are constituted of micellar surfactant solutions and offer both hydrophobic and hydrophilic environments, providing selectivity to biomolecules. We studie
Química Nova. Publicado em: 2008
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19. Surfactantes reativos não-ionicos em polimerização em emulsão de latices de acetato de vinila - vinil neodecanoato : influencia nas propriedades de barreira a agua / Nonionic reactive surfactants in emulsion polymerization of vinyl acetate - viynil neodecanoate latices : influence on the water barrier properties
A indústria de tintas é uma grande consumidora de látex obtido pela técnica da polimerização em emulsão. Os surfactantes, essenciais à estabilidade do látex, exercem um papel fundamental na produção e na aplicação destes polímeros, pois agem de forma a estabilizar as gotas de monômero na forma de emulsão. Eles são necessários para a formaç
Publicado em: 2008
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20. Interaction of hidrophilic porphyrins and extracellular hemoglobin with biomimetic models of biological membranes / Interação de porfirinas hidrofílicas e de hemoglobina extracelular com modelos biomiméticos de membrana biológica
In the first part of this work interactions of the cationic meso tetrakis (4-N-methilpyridil) porphyrin (TMPyP) and meso-tetrakis (4-sulfonatophenyl) porphyrin (TPPS4) in the free base forms with membrane model systems (ionic micelles, mixed micelles and phospholipids vesicles) in aqueous solutions, have been investigated by optical absorption, resonance lig
Publicado em: 2008
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21. Avaliação e caracterização de sistemas baseados em ponto nuvem visando a remoção de albumina do plasma sanguineo / Evaluation and characterization of cloud point based systems for albumin removal from blood plasma
In this work the partition behavior of albumin was studied, which is found at high concentrations in blood plasma, which interferes in many analytical techniques determinations. The present study evaluated different aqueous two-phase systems, exploiting a phenomenon called of cloud point. These systems employ surfactants under specific experimental condition
Publicado em: 2008
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22. 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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23. SÃntese e caracterizaÃÃo de surfactantes glicosÃdicos a partir da amilose e alquil fenÃis extraÃdos do LCC. / Synthesis and characterization of glycosidic surfactantes from amylose and alkyl extracted phenols of the LCC.
Nonionic surfactants are synthesised from renewable raw materials such as fat acids and sugars. They are dermatological safe, biodegradable and provide excellent surface active properties, such as good wettability, good foaming production and good cleaning ability. The present work deals with the synthesis and characterization of alkyl polyglycosides where t
Publicado em: 2007
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24. 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