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Eliana B. Souto - One of the best experts on this subject based on the ideXlab platform.
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croton argyrophyllus kunth essential oil loaded solid lipid nanoparticles evaluation of release profile antioxidant activity and cytotoxicity in a neuroblastoma cell line
Sustainability, 2020Co-Authors: Eliana B. Souto, Patrícia Severino, Conrado Marques, Luciana Nalone Andrade, Alessandra Durazzo, Massimo Lucarini, Atanas G Atanasov, Soukaina El Maimouni, Ettore Novellino, Antonello SantiniAbstract:The essential oil from Croton argyrophyllus Kunth is known for its antiproliferative, anti-inflammatory, antinociceptive, and anticancer activities, and is recognized as a source of phytochemicals for potential use in pharmaceutic and food sectors. Solid lipid nanoparticles (SLN) have been produced to load Croton argyrophyllus (CA) Kunth essential oil (CAEO) and its antioxidant properties evaluated in vitro as a new approach for the treatment of neurodegenerative diseases. Cetyl Palmitate SLN loading CAEO (CAEO-SLN) with a mean particle size of 201.4 ± 2.3 nm (polydispersity index 0.211) have been produced by hot high-pressure homogenisation. The release of the oil followed the Korsmeyers-Peppas model. The risk of lipid peroxidation has been determined by applying the production of thiobarbituric acid-reactive substances (TBARS) standard assay. The antioxidant activity was determined by the capacity of the antioxidants existing in CAEO to scavenge the stable radical DPPH•. The cytotoxicity of CA Kunth essential oil-loaded SLN (CAEO-SLN) was evaluated in a human cell line SH-SY5Y (derived from human neuroblastoma) by determining the reduction of the yellow dye 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT). Both free essential oil (fEO) and loaded essential oil (CAEO-SLN) were demonstrated to inhibit the Fenton reaction. CAEO-SLN showed DPPH• radical scavenging capacity. The loading of the oil into Cetyl Palmitate SLN reduced the risk of cytotoxicity.
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Hydrophilic coating of mitotane-loaded lipid nanoparticles: preliminary studies for mucosal adhesion.
Pharmaceutical Development and Technology, 2011Co-Authors: Patrícia Severino, Eliana B. Souto, Samantha Cristina De Pinho, Maria Helena Andrade SantanaAbstract:The aim of the present work was to load mitotane, an effective drug for adrenocortical carcinoma treatment, in solid lipid nanoparticles (SLN) and nanostructured lipid carriers (NLC). The SLN and NLC were successfully prepared by high shear homogenization followed by hot high pressure homogenization. Formulations were composed of Cetyl Palmitate as the solid lipid for SLN, whereas for NLC PEGylated stearic acid was selected as solid lipid and medium chain triacylglycerols as the liquid lipid. Tween® 80 and Span® 85 were used as surfactants for all formulations. The particle size, zeta potential, polydispersity index (PI), encapsulation efficiency (EE), and loading capacity (LC) were evaluated. The SLN showed a mean particle size of 150 nm, PI of 0.20, and surface charge −10 mV, and the EE and LC could reach up to 92.26% and 0.92%, respectively. The NLC were obtained with a mean particle size of 250 nm, PI of 0.30, zeta potential −15 mV and 84.50% EE, and 0.84% LC, respectively. Hydrophilic coating of SLN ...
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influence of oil content on physicochemical properties and skin distribution of nile red loaded nlc
Journal of Controlled Release, 2008Co-Authors: Veerawat Teeranachaideekul, Eliana B. Souto, Rainer H Muller, Prapaporn Boonme, Varaporn Buraphacheep JunyaprasertAbstract:The aims of this study were to investigate the effect of the oil content on the physicochemical properties of NLC and to elucidate the potential of NLC for skin targeting. The obtained results showed that an increase in the oil content did not affect the mean particle size of NLC but impacted on the zeta potential. The inner structure of NLC was influenced by the increasing proportion of oil towards the less ordered structure as confirmed by differential scanning calorimetry (DSC) and X-ray diffraction (XRD), particularly for the higher medium chain triglycerides (MCT) loading. The data from proton nuclear magnetic resonance (1H NMR) revealed that Cetyl Palmitate nanoparticles did not completely recrystallize after cooling down to room temperature. 1H NMR and DSC results indicate that MCT molecules were restricted in the NLC as compared to the nanoemulsions (NE). Nile red distribution and penetration into skin from NLC were pronounced as compared to NE and dependent on the MCT loading. The deep penetration and high amount of Nile red were related to the occlusion factor. Moreover, the epidermal targeting was achieved by NLC applications, particularly those containing 5% MCT (NLC-5) depending on the amount of MCT loading.
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solid lipid nanoparticles sln effects of lipid composition on in vitro degradation and in vivo toxicity
Die Pharmazie, 2006Co-Authors: H Weyhers, Eliana B. Souto, S Ehlers, H Hahn, Rainer H MullerAbstract:Solid lipid nanoparticles (SLN) composed of two different lipid matrices were produced to assess their in vivo toxicity in mice. Matrix substances were (i) Compritol (glycerol behenate), a physiological lipid with GRAS status (generally recognized as safe [FDA]), and (ii) Cetyl Palmitate, a less physiological compound. Physicochemical data proved the suitability of SLN batches for intravenous administration. To assess the in vivo toxicity of produced batches, 400 microl SLN dispersion (lipid content 10% [m/m]) were administered to mice via a bolus injection for six times within a period of 20 days (high dose administration). Additionally, a multiple low dose administration was performed with Compritol-SLN as well (200 microl SLN dispersion, lipid content 2.5% [m/m]). Hepatic and splenic tissues were analysed histologically. In vivo results were dependent on the lipid matrix, as well as on the dose administered. For Cetyl Palmitate containing SLN no pathological results were obtained, while high dosed Compritol containing formulations led to accumulation of the lipid in liver and spleen and subsequently to pathological alterations. These alterations were found to be partially reversible within six weeks after completing intravenous administration. Liver architecture was nearly recovered. In contrast, low dosed Compritol SLN were well tolerated. Lipid accumulation and pathological alterations of high dosed Compritol SLN were attributed to the slow degradation of the Compritol matrix which could be shown by performing in vitro studies in human plasma.
Antonello Santini - One of the best experts on this subject based on the ideXlab platform.
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croton argyrophyllus kunth essential oil loaded solid lipid nanoparticles evaluation of release profile antioxidant activity and cytotoxicity in a neuroblastoma cell line
Sustainability, 2020Co-Authors: Eliana B. Souto, Patrícia Severino, Conrado Marques, Luciana Nalone Andrade, Alessandra Durazzo, Massimo Lucarini, Atanas G Atanasov, Soukaina El Maimouni, Ettore Novellino, Antonello SantiniAbstract:The essential oil from Croton argyrophyllus Kunth is known for its antiproliferative, anti-inflammatory, antinociceptive, and anticancer activities, and is recognized as a source of phytochemicals for potential use in pharmaceutic and food sectors. Solid lipid nanoparticles (SLN) have been produced to load Croton argyrophyllus (CA) Kunth essential oil (CAEO) and its antioxidant properties evaluated in vitro as a new approach for the treatment of neurodegenerative diseases. Cetyl Palmitate SLN loading CAEO (CAEO-SLN) with a mean particle size of 201.4 ± 2.3 nm (polydispersity index 0.211) have been produced by hot high-pressure homogenisation. The release of the oil followed the Korsmeyers-Peppas model. The risk of lipid peroxidation has been determined by applying the production of thiobarbituric acid-reactive substances (TBARS) standard assay. The antioxidant activity was determined by the capacity of the antioxidants existing in CAEO to scavenge the stable radical DPPH•. The cytotoxicity of CA Kunth essential oil-loaded SLN (CAEO-SLN) was evaluated in a human cell line SH-SY5Y (derived from human neuroblastoma) by determining the reduction of the yellow dye 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT). Both free essential oil (fEO) and loaded essential oil (CAEO-SLN) were demonstrated to inhibit the Fenton reaction. CAEO-SLN showed DPPH• radical scavenging capacity. The loading of the oil into Cetyl Palmitate SLN reduced the risk of cytotoxicity.
Venishetty Vinay Kumar - One of the best experts on this subject based on the ideXlab platform.
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development and evaluation of nitrendipine loaded solid lipid nanoparticles influence of wax and glyceride lipids on plasma pharmacokinetics
International Journal of Pharmaceutics, 2007Co-Authors: Venishetty Vinay Kumar, Durairaj Chandrasekar, Sistla Ramakrishna, Veerabrahma Kishan, Prakash V DiwanAbstract:Nitrendipine is an antihypertensive drug with poor oral bioavailability ranging from 10 to 20% due to the first pass metabolism. For improving the oral bioavailability of nitrendipine, nitrendipine loaded solid lipid nanoparticles have been developed using triglyceride (tripalmitin), monoglyceride (glyceryl monostearate) and wax (Cetyl Palmitate). Poloxamer 188 was used as surfactant. Hot homogenization of melted lipids and aqueous phase followed by ultrasonication at temperature above the melting point of lipid was used to prepare SLN dispersions. SLN were characterized for particle size, zeta potential, entrapment efficiency and crystallinity of lipid and drug. In vitro release studies were performed in phosphate buffer of pH 6.8 using Franz diffusion cell. Pharmacokinetics of nitrendipine loaded solid lipid nanoparticles after intraduodenal administration to conscious male Wistar rats was studied. Bioavailability of nitrendipine was increased three- to four-fold after intraduodenal administration compared to that of nitrendipine suspension. The obtained results are indicative of solid lipid nanoparticles as carriers for improving the bioavailability of lipophilic drugs such as nitrendipine by minimizing first pass metabolism.
Patrícia Severino - One of the best experts on this subject based on the ideXlab platform.
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croton argyrophyllus kunth essential oil loaded solid lipid nanoparticles evaluation of release profile antioxidant activity and cytotoxicity in a neuroblastoma cell line
Sustainability, 2020Co-Authors: Eliana B. Souto, Patrícia Severino, Conrado Marques, Luciana Nalone Andrade, Alessandra Durazzo, Massimo Lucarini, Atanas G Atanasov, Soukaina El Maimouni, Ettore Novellino, Antonello SantiniAbstract:The essential oil from Croton argyrophyllus Kunth is known for its antiproliferative, anti-inflammatory, antinociceptive, and anticancer activities, and is recognized as a source of phytochemicals for potential use in pharmaceutic and food sectors. Solid lipid nanoparticles (SLN) have been produced to load Croton argyrophyllus (CA) Kunth essential oil (CAEO) and its antioxidant properties evaluated in vitro as a new approach for the treatment of neurodegenerative diseases. Cetyl Palmitate SLN loading CAEO (CAEO-SLN) with a mean particle size of 201.4 ± 2.3 nm (polydispersity index 0.211) have been produced by hot high-pressure homogenisation. The release of the oil followed the Korsmeyers-Peppas model. The risk of lipid peroxidation has been determined by applying the production of thiobarbituric acid-reactive substances (TBARS) standard assay. The antioxidant activity was determined by the capacity of the antioxidants existing in CAEO to scavenge the stable radical DPPH•. The cytotoxicity of CA Kunth essential oil-loaded SLN (CAEO-SLN) was evaluated in a human cell line SH-SY5Y (derived from human neuroblastoma) by determining the reduction of the yellow dye 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT). Both free essential oil (fEO) and loaded essential oil (CAEO-SLN) were demonstrated to inhibit the Fenton reaction. CAEO-SLN showed DPPH• radical scavenging capacity. The loading of the oil into Cetyl Palmitate SLN reduced the risk of cytotoxicity.
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electron paramagnetic resonance and small angle x ray scattering characterization of solid lipid nanoparticles and nanostructured lipid carriers for dibucaine encapsulation
Langmuir, 2018Co-Authors: Raquel De Melo Barbosa, Patrícia Severino, Bruna Renata Casadei, Evandro L Duarte, Leandro R S Barbosa, Nelson Duran, Eneida De PaulaAbstract:Dibucaine (DBC) is one of the most potent long-acting local anesthetics, but it also has significant toxic side effects and low water solubility. Solid lipid nanoparticles (SLNs) and nanostructured lipid carriers (NLCs) have been proposed as drug-delivery systems to increase the bioavailability of local anesthetics. The purpose of the present study was to characterize SLNs and NLCs composed of Cetyl Palmitate or myristyl myristate, a mixture of capric and caprylic acids (for NLCs only) plus Pluronic F68 prepared for the encapsulation of DBC. We intended to provide a careful structural characterization of the nanoparticles to identify the relevant architectural parameters that lead to the desirable biological response. Initially, SLNs and NLCs were assessed in terms of their size distribution, morphology, surface charge, and drug loading. Spectroscopic techniques (infrared spectroscopy and electron paramagnetic resonance, EPR) plus small-angle X-ray scattering (SAXS) provided information on the interaction...
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Development and physical chemistry characterization of solid lipid nanoparticles for encapsulating proteins
2017Co-Authors: Patrícia SeverinoAbstract:Resumo: Nanopartículas Lipídicas Sólidas (NLS) vêm sendo investigadas desde o início dos anos 90. As dispersões de NLS apresentam como característica principal a interação com moléculas dos fármacos ou proteínas resultando em uma liberação sustentada e o transporte do princípio ativo até o alvo terapêutico, aumentando assim a sua eficácia de ação. Este trabalho teve como objetivo o desenvolvimento de NLS empregando vários tipos de lipídios (Dynasan® 114, Dynasan® 118, Ácido esteárico, Cetilpalmitato, Softisan® 100), misturas de tensoativos (Tween® 80, Span® 85, Span® 80, Lipoid® S75) e de metodologias de homogeneização a alta pressão a quente e dupla emulsificação (A/O/A). A caracterização da pré-formulação por realizada por análises térmicas, morfologia e equilíbrio hidrofílico lipofílico (EHL). Os processos de produção empregados foram otimizados com planejamento de experimentos e as NLS produzidas foram caracterizadas quanto ao tamanho, polidspersidade, potencial zeta, eficiência de encapsulação, citotoxicidade, capacidade de transfecção, morfologia e estabilidade. Proteína modelos foi encapsulada em NLS desenvolvidas pela metodologia de dupla emulsificação. As NLS apresentaram baixa toxicidade em estudos celulares, estabilidade em estudos in vitro, e morfologia esférica. Adicionalmente, foi acrescentado carga superficial catiônica e ensaios de capacidade de transfecção mostraram satisfatórios. As NLS desenvolvidas neste trabalho apresentaram promissoras para encapsulação de proteínas e possivelmente ácidos nucleicos para administração parenteral.Abstract: Solid Lipid Nanoparticles (SLN) have been investigated since the early 90s. The SLN dispersions have as main feature the strong interaction with drugs molecule or proteins resulting in a sustained release and target specific delivery increasing the action. This work aimed at the development of NLS employing various types of lipids (dynasan® 114, dynasan® 118, stearic acid, Cetyl Palmitate, softisan® 100), mixtures of surfactants (tween® 80, span® 85, span® 80, lipoid® S75) and methods for hot high pressure omogenization and double emulsification (w/o/a). The pre formulation characterization was performed by thermal analysis, morphology and Hydrophilic Lipophilic Balance (HLB). The production processes were optimized with factorial design and NLS were characterized by size, polidspersidade, zeta potential, encapsulation efficiency, cytotoxicity, transfection capacity, morphology and stability. Model Protein was encapsulated in NLS developed by double emulsification methodology. The NLS showed low toxicity in cellular studies, stability in vitro and spherical morphology. Additionally, was added cationic charge in surface and evaluate capacity of transfection in Hela cells. The NLS developed in this work showed promise for encapsulation of proteins and, possibly, nucleic acids for parenteral administration
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Development and physical chemistry characterization of solid lipid nanoparticles for encapsulating proteins
Universidade Estadual de Campinas . Faculdade de Engenharia Química, 2012Co-Authors: Patrícia SeverinoAbstract:Nanopartículas Lipídicas Sólidas (NLS) vêm sendo investigadas desde o início dos anos 90. As dispersões de NLS apresentam como característica principal a interação com moléculas dos fármacos ou proteínas resultando em uma liberação sustentada e o transporte do princípio ativo até o alvo terapêutico, aumentando assim a sua eficácia de ação. Este trabalho teve como objetivo o desenvolvimento de NLS empregando vários tipos de lipídios (Dynasan® 114, Dynasan® 118, Ácido esteárico, Cetilpalmitato, Softisan® 100), misturas de tensoativos (Tween® 80, Span® 85, Span® 80, Lipoid® S75) e de metodologias de homogeneização a alta pressão a quente e dupla emulsificação (A/O/A). A caracterização da pré-formulação por realizada por análises térmicas, morfologia e equilíbrio hidrofílico lipofílico (EHL). Os processos de produção empregados foram otimizados com planejamento de experimentos e as NLS produzidas foram caracterizadas quanto ao tamanho, polidspersidade, potencial zeta, eficiência de encapsulação, citotoxicidade, capacidade de transfecção, morfologia e estabilidade. Proteína modelos foi encapsulada em NLS desenvolvidas pela metodologia de dupla emulsificação. As NLS apresentaram baixa toxicidade em estudos celulares, estabilidade em estudos in vitro, e morfologia esférica. Adicionalmente, foi acrescentado carga superficial catiônica e ensaios de capacidade de transfecção mostraram satisfatórios. As NLS desenvolvidas neste trabalho apresentaram promissoras para encapsulação de proteínas e possivelmente ácidos nucleicos para administração parenteral.Solid Lipid Nanoparticles (SLN) have been investigated since the early 90s. The SLN dispersions have as main feature the strong interaction with drugs molecule or proteins resulting in a sustained release and target specific delivery increasing the action. This work aimed at the development of NLS employing various types of lipids (dynasan® 114, dynasan® 118, stearic acid, Cetyl Palmitate, softisan® 100), mixtures of surfactants (tween® 80, span® 85, span® 80, lipoid® S75) and methods for hot high pressure omogenization and double emulsification (w/o/a). The pre formulation characterization was performed by thermal analysis, morphology and Hydrophilic Lipophilic Balance (HLB). The production processes were optimized with factorial design and NLS were characterized by size, polidspersidade, zeta potential, encapsulation efficiency, cytotoxicity, transfection capacity, morphology and stability. Model Protein was encapsulated in NLS developed by double emulsification methodology. The NLS showed low toxicity in cellular studies, stability in vitro and spherical morphology. Additionally, was added cationic charge in surface and evaluate capacity of transfection in Hela cells. The NLS developed in this work showed promise for encapsulation of proteins and, possibly, nucleic acids for parenteral administration
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Hydrophilic coating of mitotane-loaded lipid nanoparticles: preliminary studies for mucosal adhesion.
Pharmaceutical Development and Technology, 2011Co-Authors: Patrícia Severino, Eliana B. Souto, Samantha Cristina De Pinho, Maria Helena Andrade SantanaAbstract:The aim of the present work was to load mitotane, an effective drug for adrenocortical carcinoma treatment, in solid lipid nanoparticles (SLN) and nanostructured lipid carriers (NLC). The SLN and NLC were successfully prepared by high shear homogenization followed by hot high pressure homogenization. Formulations were composed of Cetyl Palmitate as the solid lipid for SLN, whereas for NLC PEGylated stearic acid was selected as solid lipid and medium chain triacylglycerols as the liquid lipid. Tween® 80 and Span® 85 were used as surfactants for all formulations. The particle size, zeta potential, polydispersity index (PI), encapsulation efficiency (EE), and loading capacity (LC) were evaluated. The SLN showed a mean particle size of 150 nm, PI of 0.20, and surface charge −10 mV, and the EE and LC could reach up to 92.26% and 0.92%, respectively. The NLC were obtained with a mean particle size of 250 nm, PI of 0.30, zeta potential −15 mV and 84.50% EE, and 0.84% LC, respectively. Hydrophilic coating of SLN ...
Prakash V Diwan - One of the best experts on this subject based on the ideXlab platform.
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development and evaluation of nitrendipine loaded solid lipid nanoparticles influence of wax and glyceride lipids on plasma pharmacokinetics
International Journal of Pharmaceutics, 2007Co-Authors: Venishetty Vinay Kumar, Durairaj Chandrasekar, Sistla Ramakrishna, Veerabrahma Kishan, Prakash V DiwanAbstract:Nitrendipine is an antihypertensive drug with poor oral bioavailability ranging from 10 to 20% due to the first pass metabolism. For improving the oral bioavailability of nitrendipine, nitrendipine loaded solid lipid nanoparticles have been developed using triglyceride (tripalmitin), monoglyceride (glyceryl monostearate) and wax (Cetyl Palmitate). Poloxamer 188 was used as surfactant. Hot homogenization of melted lipids and aqueous phase followed by ultrasonication at temperature above the melting point of lipid was used to prepare SLN dispersions. SLN were characterized for particle size, zeta potential, entrapment efficiency and crystallinity of lipid and drug. In vitro release studies were performed in phosphate buffer of pH 6.8 using Franz diffusion cell. Pharmacokinetics of nitrendipine loaded solid lipid nanoparticles after intraduodenal administration to conscious male Wistar rats was studied. Bioavailability of nitrendipine was increased three- to four-fold after intraduodenal administration compared to that of nitrendipine suspension. The obtained results are indicative of solid lipid nanoparticles as carriers for improving the bioavailability of lipophilic drugs such as nitrendipine by minimizing first pass metabolism.