Browsing by Author "Mussel, Wagner da Nova"

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    Amphotericin B-loaded Eudragit RL100 nanoparticles coated with hyaluronic acid for the treatment of vulvovaginal candidiasis.
    (2020) Melo, Carolina Mirtes; Cardoso, Jéssica Ferreira; Perasoli, Fernanda Barçante; Oliveira Neto, Ari Soares de; Pinto, Luccas Moreira; Marques, Maria Betânia de Freitas; Mussel, Wagner da Nova; Magalhães, Juliana Teixeira de; Moura, Sandra Aparecida Lima de; Araújo, Marcelo Gonzaga de Freitas; Silva, Gisele Rodrigues da
    The treatment of vulvovaginal candidiasis (VVC) is based on oral and vaginal formulations which show limited effectiveness. In this study, amphotericin B-loaded Eudragit RL100 nanoparticles coated with hyaluronic acid (AMP EUD nanoparticles/HA) were developed to overcome the drawbacks of the conventional formulations. AMP EUD nanoparticles/HA were synthesized by nanoprecipitation, formulated by statistical experimental design, and characterized. AMP release from EUD nanoparticles/HA and its antifungal activity in a murine model of VVC were evaluated. Nanoparticles showed 147.6 ± 16.7 nm of diameter, 0.301 ± 0.09 of polydispersity index, - 29.9 ± 3.76 mV of zeta potential, and 87.27 % of encapsulation efficiency. They released about 81 % of AMP in 96 h; and provided the elimination of 100 % of the vaginal fungal burden in 24 h. It was suggested that the AMP EUD nanoparticles/HA penetrated into the vaginal epithelium via CD44 receptors. These AMP EUD nanoparticles/HA represent a non-conventional vaginal formulation to improve the treatment of VVC.
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    Combined experimental powder x-ray diffraction and DFT data to obtain the lowest energy molecular conformation of friedelin.
    (2012) Oliveira, Djalma Menezes de; Mussel, Wagner da Nova; Duarte, Lucienir Pains; Silva, Grácia Divina de Fátima; Duarte, Hélio Anderson; Gomes, Elionai Cassiana de Lima; Guimarães, Luciana; Vieira Filho, Sidney Augusto
    Friedelin molecular conformers were obtained by Density Functional Theory (DFT) and by ab initio structure determination from powder X-ray diffraction. Their conformers with the five rings in chair-chair-chair-boat-boat, and with all rings in chair, are energy degenerated in gas-phase according to DFT results. The powder diffraction data reveals that rings A, B and C of friedelin are in chair, and rings D and E in boat-boat, conformation. The high correlation values among powder diffraction data, DFT and reported single-crystal data indicate that the use of conventional X-ray diffractometer can be applied in routine laboratory analysis in the absence of a single-crystal diffractometer.
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    Data on statistical experimental design to formulate amphotericin B-loaded Eudragit RL100 nanoparticles coated with hyaluronic acid for the treatment of vulvovaginal candidiasis.
    (2020) Melo, Carolina Mirtes; Cardoso, Jéssica Ferreira; Perasoli, Fernanda Barçante; Marques, Maria Betânia de Freitas; Mussel, Wagner da Nova; Moura, Sandra Aparecida Lima de; Silva, Gisele Rodrigues da
    Data described in this article are related to the research article entitled “Amphotericin B-loaded Eudragit RL100 nanoparticles coated with hyaluronic acid (AMP EUD nanoparticles/HA) for the treatment of vulvovaginal candidiasis” [1]. In this work, we report original data on the statistical experimental design to formulate uncoated AMP EUD nanoparticles, data on the validation of spectrophotometric method to quantify the AMP released from uncoated EUD nanoparticles and coated with HA to obtain the in vitro drug release profiles as well as the drug encapsulation efficiency. In addition, we describe original data on characterization, including diameter size, polydispersity index, zeta potential, FTIR, DSC/TG, and XRD; data on diameter of in vitro inhibition halos of Candida albicans; and on the vaginal burden of infected animals treated with uncoated AMP EUD nanoparticles and AMP EUD nanoparticles/HA. Finally, different histological sections of endocervix collected from treated and untreated animals were inserted into this manuscript.
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    Lupeol and its esters : NMR, powder XRD data and in vitro evaluation of cancer cell growth.
    (2018) Silva, Aline Teixeira Maciel; Magalhães, Cássia Gonçalves; Duarte, Lucienir Pains; Mussel, Wagner da Nova; Ruiz, Ana Lucia Tasca Gois; Shiozawa, Larissa; Carvalho, João Ernesto de; Trindade, Izabel Cristina; Vieira Filho, Sidney Augusto
    The triterpene lupeol (1) and some of its esters are secondary metabolites produced by species of Celastraceae family, which have being associated with cytotoxic activity. We report herein the isolation of 1, the semi-synthesis of eight lupeol esters and the evaluation of their in vitro activity against nine strains of cancer cells. The reaction of carboxylic acids with 1 and DIC/DMAP was used to obtain lupeol stearate (2), lupeol palmitate (3) lupeol miristate (4), and the new esters lupeol laurate (5), lupeol caprate (6), lupeol caprilate (7), lupeol caproate (8) and lupeol 3’,4’-dimethoxybenzoate (9), with high yields. Compounds 1-9 were identified using FT-IR, 1H, 13C-NMR, CHN analysis and XRD data and were tested in vitro for proliferation of human cancer cell activity. In these assays, lupeol was inactive (GI50> 250μg/ mL) while lupeol esters 2 -4 and 7 - 9 showed a cytostatic effect. The XRD method was a suitable tool to determine the structure of lupeol and its esters in solid state. Compound 3 showed a selective growth inhibition effect on erythromyeloblastoid leukemia (K-562) cells in a concentration-dependent way. Lupeol esters 4 and 9 showed a selective cytostatic effect with low GI50 values representing promising prototypes for the development of new anticancer drugs.
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    A new theranostic system for bone disorders : functionalized folate-MDP hydroxyapatite nanoparticles with radiolabeled copper-64.
    (2020) Cipreste, Marcelo Fernandes; Mussel, Wagner da Nova; Silva, Juliana Batista da; Marques, Maria Betânia de Freitas; Batista, Ronaldo Junio Campos; Gastelois, Pedro Lana; Macedo, Waldemar Augusto de Almeida; Sousa, Edésia Martins Barros de
    Hydroxyapatite nanoparticles have been investigated as biological agents for the treatment and diagnosis of bone diseases due to their properties, providing high affinity to bone tissues and also due to the possibility to chemically modify the surfaces of these nanoparticles to provide active targeting to bone tumors or other bone disorders. In this work, synthetic hydroxyapatite nanoparticles and their surface modifications with folic and medronic acid were studied. Copper-64 was produced by neutron irradiation in a TRIGA MARK I nuclear reactor, and the functionalized nanoparticles radiolabeled with this radioisotope. The multi-technique characterization includes FTIR, PXRD, TGA, DSC, CHN, Zeta potential, XPS, SEM, TEM, and Gamma spectroscopy. Furthermore, the evaluation of the chemical interaction stability was through leaching tested for efficiency. The results indicate that folic and medronic acids can be covalently bonded to HA surface, producing a new material not yet described in the literature, been stably attached to hydroxyapatite nanoparticle surfaces, able to provide active targeting for bone disorders. The complexation of copper-64 provides high radiochemistry purity, although the specific activity must be improved.
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    Obtenção de óxido de manganês eletrolítico a partir do resíduo proveniente do beneficiamento de minério de manganês sílico-carbonatado.
    (2018) Oliveira, Stênio Bruno Lobo de; Carvalho, Cornélio de Freitas; Paiva, José Fernando de; Carvalho, Cornélio de Freitas; Mussel, Wagner da Nova; Gil, Laurent Frédéric
    Este trabalho aborda a reciclagem do resíduo industrial proveniente da planta de beneficiamento de finos de minério de manganês sílico-carbonatado da Companhia Rio Doce Manganês (RDM), localizada em Conselheiro Lafaiete-MG. O minério de manganês gerado pela Companhia Rio Doce Manganês representa um passivo ambiental superior a 480.000 toneladas. Este resíduo, disposto nos pátios da mineradora, é composto por espessartita, rodocrosita e birnessita, e, é caracterizado como um rejeito por possuir 84% de suas partículas com granulometria inferior a 25 mm (60 mesh); estas sem valor agregado na indústria de mineração. Realizaram-se testes de lixiviação, em um sistema contínuo, com ácido sulfúrico e, desta reação, obteve-se o sulfato de manganês, o qual apresentou pH em torno de 0,40. Inicialmente, aplicou-se a análise univariada a fim de se conhecer melhor o comportamento do sistema. Para a otimização das condições experimentais, utilizou-se a metodologia do planejamento experimental multivariado, a qual possibilitou investigar a influência dos diversos parâmetros no rendimento da lixiviação, proporcionando resultados satisfatórios. A solução lixiviada foi quantificada com permanganato de potássio (KMnO4) e, posteriormente, submetida ao processo de eletrólise para se produzir óxido de manganês (MnO2). Para a fase de otimização, utilizou-se o planejamento fatorial completo (CCD) 23 a fim de se determinar os níveis ótimos da correlação entre os fatores estudados e de se produzir um melhor rendimento na deposição eletrolítica. Os resultados que apresentaram os melhores rendimentos de produção, tanto no processo da lixiviação do Mn (12,71%), quanto na deposição eletrolítica do MnO2 (48,8%), foram analisados e qualificados quanto a sua viabilidade e eficiência.
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    Pentacyclic triterpenes from branches of Maytenus robusta and in vitro cytotoxic property against 4T1 cancer cells.
    (2014) Sousa, Grasiely Faria de; Soares, Daniel Crístian Ferreira; Mussel, Wagner da Nova; Pompeu, Nana Flora Elias; Silva, Grácia Divina de Fátima; Vieira Filho, Sidney Augusto; Duarte, Lucienir Pains
    Dois novos friedelanos, 1 e 2, e cinco triterpenos pentacíclicos conhecidos foram isolados dos galhos de Maytenus robusta. Suas estruturas químicas foram identificadas como 3,16-dioxo-29- hidroxifriedelano (1), 3-oxo-16b,29-di-hidroxifriedelano (2), 3-oxofriedelano (3), 3b-friedelinol (4), 3,16-dioxofriedelano (5), 3-oxo-29-hidroxifriedelano (6) e 3,16-dioxo-12a-hidroxifriedelano (7). A estrutura e estereoquímica dos triterpenos 1 e 2 foram estabelecidas por infravermelho (IR), ressonância magnética nuclear (NMR) 1D/2D, espectrometria de massas de alta resolução com ionização química à pressão atmosférica (HR-APCIMS) e difração de raios X de pó. A atividade citotóxica in vitro dos triterpenos 1 a 6 foi avaliada frente a células de câncer de mama murino. Os triterpenos 1 e 2 apresentaram atividade citotóxica contra células 4T1 em baixa concentração.
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    Polymorphic and quantum chemistry characterization of candesartan cilexetil : importance for the correct drug classification according to Biopharmaceutics Classification System.
    (2018) Campos, Débora Priscila de; Barcellos, Neila Marcia Silva; Lima, Renata Rodrigues; Savedra, Ranylson Marcello Leal; Savedra, Melissa Fabíola Siqueira; Yoshida, Maria Irene; Mussel, Wagner da Nova; Souza, Jacqueline de
    The recommended method for the biopharmaceutical evaluation of drug solubility is the shake flask; however, there are discrepancies reported about the solubility of certain compounds measured with this method, one of them is candesartan cilexetil. The present work aimed to elucidate the solubility of candesartan cilexetil by associating others assays such as stability determination, polymorphic characterization and in silico calculations of intrinsic solubility, ionized species, and electronic structures using quantum chemistry descriptors (frontier molecular orbitals and Fukui functions). For the complete biopharmaceutical classification, we also reviewed the permeability data available. The polymorphic form used was previously identified as the form I of candesartan cilexetil. The solubility was evaluated in biorelevant media in the pH range of 1.2–6.8 at 37.0°C according to the stability previously assessed. The solubility of candesartan cilexetil is pH dependent and the dose/solubility ratios obtained demonstrated the low solubility of the prodrug. The in silico calculations supported the found results and evidenced the main groups involved in the solvation, benzimidazole, and tetrazol-biphenyl. The human absolute bioavailability reported demonstrates that candesartan cilexetil has low permeability and when associated with the low solubility allows to classify it as class 4 of the Biopharmaceutics Classification System.
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    Polymorphic characterization and implications on biopharmaceutics properties of potential anti-inflammatory drug candidate eremantholide C from Lychnophora trichocarpha (Brazilian Arnica).
    (2019) Caldeira, Tamires Guedes; Guimarães, Dênia Antunes Saúde; Lacerda, Dâmaris Laignier Rodrigues de; Mussel, Wagner da Nova; Yoshida, Maria Irene; Souza, Jacqueline de
    Objectives: To perform the polymorphic and physicochemical characterization of the potential anti-inflammatory drug, eremantholide C (EREC), as well as to evaluate the influence of these characteristics on its biopharmaceutics classification. Methods Eremantholide C was obtained from chloroformic extract of Lychnophora trichocarpha and crystallized in two distinct solvents: chloroform (EREC 1) and ethyl acetate (EREC 2). To evaluate the polymorphism, EREC samples were submitted to melting point, purity, infrared spectroscopy, differential scanning calorimetry (DSC), X-ray powder diffraction, optical microscopy and scanning electron microscopy analysis. In addition, EREC samples crystallized after intrinsic dissolution study were submitted to DSC and X-ray powder diffraction analysis. Key findings EREC 1 showed fusion at 234.7–241.6 °C, while EREC 2 showed fusion at 238.6–243.7 °C. No polymorphic transitions were observed during the intrinsic dissolution experiment. A single sharp endothermic peak was obtained for the EREC samples. X-ray diffraction showed no crystallographic differences between the EREC samples. EREC 1 and EREC 2 showed birefringence under polarized light and indefinite morphology; however, the shape of the crystals was common to the two samples. Conclusions: Eremantholide C does not present classical or morphological polymorphism; therefore, there is no influence of crystalline transitions in the solubility and consequently in its biopharmaceutics classification and oral absorption process.
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    Reciclagem de éter-aminas, utilizadas na flotação de minério de ferro, através da adsorção.
    (2016) Fernandes, Hana Dalila; Carvalho, Cornélio de Freitas; Carvalho, Cornélio de Freitas; Mussel, Wagner da Nova; Gurgel, Leandro Vinícius Alves
    O Brasil assumiu o terceiro lugar na produção mundial de minério de ferro, e como etapa de concentração, as indústrias mineradoras têm utilizado o processo de flotação catiônica reversa. Nesta operação a utilização das éter-aminas, como coletores, se faz necessária para o aumento da eficiência do processo. O presente trabalho tem por objetivo verificar uma possível rota para reciclar este reagente, devido seu alto custo e sua disposição no meio ambiente. Estudou-se um método de separação físico-químico, utilizando TANFLOC como floculante. As águas de rejeito contêm, em sua maior parte, amina e sílica, e o objetivo deste método foi separar a sílica do rejeito, por floculação, permitindo assim reciclar a água e a éter-amina e reutilizá-las no sistema. Porém este método não foi eficaz, visto que a floculação não foi capaz de flocular somente a sílica e parte da éter-amina também foi floculada. Avaliou-se também o processo de adsorção, um método de separação seletiva em que um soluto se adere à interface de um sólido. Foi analisada a capacidade adsortiva de diversos materiais, como: casca de banana, quitosana, resíduo de minério de manganês, resíduo de alumina, serragem pinus, carvão ativado e bagaço de cana quimicamente modificado com ácido meldrum. Aprofundou-se os estudos de adsorção para a serragem Angelim e bagaço de cana de açúcar, ambos in natura. Os mesmos foram capazes de remover aproximadamente 95% e 90% de éter-amina, respectivamente, pelo processo de adsorção, utilizando uma massa de 1,5 gramas, e um tempo de equilíbrio estabelecido de 30 minutos. Além disso, verificou-se que a eficiência de remoção é maior em pH próximo a 10.Pelos estudos termodinâmicos foi possível concluir, para a serragem, que o processo é termodinamicamente favorável e exotérmico. Para o bagaço de cana não foi possível analisar o comportamento termodinâmico. Além disso, o processo de dessorção permitiu recuperar em torno de 80% de éter-amina, além da possibilidade de regeneração e reutilização dos materiais adsorventes, o que mostra a possibilidade de reciclar a éter-amina pelo mecanismo de adsorção.
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    Spiramyin-loaded PLGA implants for the treatment of ocular toxoplasmosis : development, characterization, biocompatibility, and anti-toxoplasma activity.
    (2021) Tavares, Harley da Silva; Cardoso, Jéssica Ferreira; Almeida, Tamires Cunha; Marques, Maria Betânia de Freitas; Mussel, Wagner da Nova; Lopes, M. C. P.; Oréfice, Rodrigo Lambert; Andrade, S. N.; Varotti, Fernando de Pilla; Silva, Glenda Nicioli da; Silva, Gisele Rodrigues da
    Ocular toxoplasmosis is the major cause of infectious posterior uveitis worldwide, inducing visual field defect and/or blindness. Despite the severity of this disease, an effective treatment is still lacking. In this study, spiramycin-loaded PLGA implants were developed aiming at the treatment of ocular toxoplasmosis. Implants were manufactured by a hot-molding technique, characterized by Fourier Transform Infrared Spectroscopy, X-Ray Diffraction, Differential Scanning Calorimetry, Scanning Electron Microscopy; evaluated in terms of ocular biocompatibility by immunofluorescence, flow cytometry, cell migration, Hen’s egg test-chorioallantoic membrane (HET-CAM) irritation test; and investigated in terms of in vitro efficacy against Toxoplasma gondii. Characterization techniques indicated that spiramycin was dispersed into the polymeric chains and both substances preserved their physical structures in implants. The HET-CAM test indicated that implants did not induce hemorrhage or coagulation, being non-irritant to the CAM. ARPE-19 cells showed viability by MTT assay, and normality in cell cycle kinetics and morphology, without stimulating cell death by apoptosis. Finally, they were highly effective against intracellular parasites without inducing human retinal pigment epithelial cell death. In conclusion, spiramycin-loaded PLGA implants represent a promising therapeutic alternative for the local treatment of ocular toxoplasmosis.
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    Vancomycin-loaded N,N-dodecyl,methyl-polyethylenimine nanoparticles coated with hyaluronic acid to treat bacterial endophthalmitis : development, characterization, and ocular biocompatibility.
    (2021) Cardoso, Jéssica Ferreira; Perasoli, Fernanda Barçante; Almeida, Tamires Cunha; Marques, Maria Betânia de Freitas; Toledo, Cibele Rodrigues; Gil, Priscilla Oliveira; Tavares, Harley da Silva; Paz, Mariana Campos da; Mussel, Wagner da Nova; Magalhães, Juliana Texeira; Silva, Glenda Nicioli da; Cunha Júnior, Armando da Silva; Granjeiro, Paulo Afonso; Klibanov, Alexander M.; Silva, Gisele Rodrigues da
    Vancomycin-loaded N,N-dodecyl,methyl-polyethylenimine nanoparticles coated with hyaluronic acid (VCMDMPEI nanoparticles/HA) were synthesized as an adjuvant for the treatment of bacterial endophthalmitis. The nanoparticles were formulated by experimental statistical design, thoroughly characterized, and evaluated in terms of bactericidal activity and both in vitro and in vivo ocular biocompatibility. The VCM-DMPEI nanoparticles/HA were 154 ± 3 nm in diameter with a 0.197 ± 0.020 polydispersity index; had a + 26.4 ± 3.3 mV zeta potential; exhibited a 93% VCM encapsulation efficiency; and released 58% of the encapsulated VCM over 96 h. VCM and DMPEI exhibited a synergistic bactericidal effect. The VCM-DMPEI nanoparticles/HA were neither toxic to ARPE-19 cells nor irritating to the chorioallantoic membrane. Moreover, the VCM-DMPEI nanoparticles/HA did not induce modifications in retinal functions, as determined by electroretinography, and in the morphology of the ocular tissues. In conclusion, the VCM-DMPEI nanoparticles/HA may be a useful therapeutic adjuvant to treat bacterial endophthalmitis.