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Conceição J, Adeoye O, Cabral-Marques H, Concheiro A, Alvarez-Lorenzo C, Sousa Lobo JM. Carbamazepine bilayer tablets combining hydrophilic and hydrophobic cyclodextrins as a quick/slow biphasic release system. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101611] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Adeoye O, Bártolo I, Conceição J, da Silva AB, Duarte N, Francisco AP, Taveira N, Cabral-Marques H. Pyromellitic dianhydride crosslinked soluble cyclodextrin polymers: Synthesis, lopinavir release from sub-micron sized particles and anti-HIV-1 activity. Int J Pharm 2020; 583:119356. [PMID: 32325245 DOI: 10.1016/j.ijpharm.2020.119356] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 03/30/2020] [Accepted: 04/18/2020] [Indexed: 12/24/2022]
Abstract
We report the synthesis of water soluble cyclodextrin (CD) polymers prepared by crosslinking pyromellitic dianhydride (PMDA) with two CD derivatives (methyl-β-CD - MβCD and (2-hydroxy)propyl-β-CD - HPβCD) and their evaluation as functional sub-micron sized carriers in the development of antiretroviral drug delivery systems. Using the protease inhibitor lopinavir (LPV) as model drug, LPV loaded CD polymers (pHPβCD and pMβCD) were prepared and fully characterized. The physicochemical characterization and in vitro drug release confirmed the successful synthesis of pHPβCD and pMβCD, the formation of sub-micron sized particles and a 12-14 fold increase in LPV solubility. Cytotoxicity assays indicated that both pHPβCD and pMβCD were able to improve the safety profile of LPV while the viral infectivity assay revealed a concentration independent anti-HIV-1 effect for both pHPβCD and pMβCD with a maximum percentage inhibition (MPI) of 79 and 91% respectively. After LPV loading, the antiviral profile of pHPβCD was reversed to the sigmoidal dose-response profile of LPV, while pMβCD maintained its dose-independent profile followed by a LPV mediated increase in viral inhibition. Overall, both pHPβCD and pMβCD demonstrated anti-HIV-1 activity, while drug loaded pMβCD indicated its potential as functional sub-micron sized drug delivery polymers for achieving synergistic anti-HIV activity.
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Affiliation(s)
- Oluwatomide Adeoye
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - Inês Bártolo
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - Jaime Conceição
- UCIBIO/REQUIMTE, MedTech - Laboratory of Pharmaceutical Technology, Department of Drug Sciences, Faculty of Pharmacy, University of Porto, Oporto, Portugal
| | - Andreia Bento da Silva
- Faculdade de Farmácia da Universidade de Lisboa (FFULisboa), Avenida Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Noélia Duarte
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - Ana Paula Francisco
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - Nuno Taveira
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal; Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz, Caparica, Portugal
| | - Helena Cabral-Marques
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal.
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Conceição J, Adeoye O, Cabral-Marques H, Concheiro A, Alvarez-Lorenzo C, Sousa Lobo JM. Orodispersible Carbamazepine/Hydroxypropyl-β-Cyclodextrin Tablets Obtained by Direct Compression with Five-in-One Co-processed Excipients. AAPS PharmSciTech 2020; 21:39. [PMID: 31897724 DOI: 10.1208/s12249-019-1579-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Accepted: 11/12/2019] [Indexed: 11/30/2022] Open
Abstract
The development of orodispersible tablets (ODTs) for poorly soluble and poorly flowable drugs via direct compression is still a challenge. This work aimed to develop ODTs of poorly soluble drugs by combining cyclodextrins that form inclusion complexes to improve wetting and release properties, and directly compressible co-processed excipients able to promote rapid disintegration and solve the poor flowability typical of inclusion complexes. Carbamazepine (CBZ) and hydroxypropyl-β-cyclodextrin (HPβCD) were used, respectively, as a model of a poorly soluble drug with poor flowability and as a solubilizing agent. Specifically, CBZ-an antiepileptic and anticonvulsant drug-may benefit from the studied formulation approach, since some patients have swallowing difficulties or fear of choking and are non-cooperative. Prosolv® ODT G2 and F-Melt® type C were the studied five-in-one co-processed excipients. The complex was prepared by kneading. Flow properties of all materials and main properties of the tablets were characterized. The obtained results showed that ODTs containing CBZ/HPβCD complex can be prepared by direct compression through the addition of co-processed excipients. The simultaneous use of co-processing and cyclodextrin technologies rendered ODTs with an in vitro disintegration time in accordance with the European Pharmacopoeia requirement and with a fast and complete drug dissolution. In conclusion, the combination of five-in-one co-processed excipients and hydrophilic cyclodextrins may help addressing the ODT formulation of poorly soluble drugs with poor flowability, by direct compression and with desired release properties.
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Conceição J, Farto-Vaamonde X, Goyanes A, Adeoye O, Concheiro A, Cabral-Marques H, Sousa Lobo JM, Alvarez-Lorenzo C. Hydroxypropyl-β-cyclodextrin-based fast dissolving carbamazepine printlets prepared by semisolid extrusion 3D printing. Carbohydr Polym 2019; 221:55-62. [DOI: 10.1016/j.carbpol.2019.05.084] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 05/15/2019] [Accepted: 05/15/2019] [Indexed: 10/26/2022]
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Adeoye O, Conceição J, Serra PA, Bento da Silva A, Duarte N, Guedes RC, Corvo MC, Aguiar-Ricardo A, Jicsinszky L, Casimiro T, Cabral-Marques H. Cyclodextrin solubilization and complexation of antiretroviral drug lopinavir: In silico prediction; Effects of derivatization, molar ratio and preparation method. Carbohydr Polym 2019; 227:115287. [PMID: 31590843 DOI: 10.1016/j.carbpol.2019.115287] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/12/2019] [Accepted: 09/02/2019] [Indexed: 01/03/2023]
Abstract
Lopinavir (LPV) is currently used in combination with ritonavir for the clinical management of HIV infections due to its limited oral bioavailability. Herein, we report the application of an in silico method to study cyclodextrin (CyD) host-guest molecular interaction with LPV for the rational selection of the best CyD for developing a CyD based LPV delivery system. The predicted CyD, a (2-hydroxy)propyl-gamma derivative with high degree of substitution (HP17-γ-CyD) was synthesized and comparatively evaluated with γ-CyD and the commercially available HP-γ-CyD. All complexes were prepared by supercritical assisted spray drying (SASD) and co-evaporation (CoEva) at molar ratios (1:1 and 1:2); and afterwards fully characterized. Results indicate a higher LPV amorphization and solubilization ability of HP17-γ-CyD. The SASD processing technology also enhanced LPV solubilization and release from complexes. The application of in silico methodologies is a feasible approach for the rational and/or deductive development of CyD drug delivery systems.
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Affiliation(s)
- Oluwatomide Adeoye
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - Jaime Conceição
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal; UCIBIO/REQUIMTE, MedTech - Laboratory of Pharmaceutical Technology, Department of Drug Sciences, Faculty of Pharmacy, University of Porto, Oporto, Portugal
| | - Patrícia A Serra
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - Andreia Bento da Silva
- Faculdade de Farmácia da Universidade de Lisboa (FFULisboa), Avenida Prof. Gama Pinto, 1649-003, Lisboa, Portugal
| | - Noélia Duarte
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - Rita C Guedes
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - Marta C Corvo
- i3N|CENIMAT, Department of Materials Science, Faculty of Science and Technology, UNL, 2829-516, Caparica, Portugal
| | - Ana Aguiar-Ricardo
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516, Caparica, Portugal
| | - László Jicsinszky
- Department of Drug Science and Technology, University of Turin, Via P. Giuria 9, 10125, Turin, Italy
| | - Teresa Casimiro
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, 2829-516, Caparica, Portugal
| | - Helena Cabral-Marques
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal.
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Conceição J, Adeoye O, Cabral-Marques HM, Sousa Lobo JM. Hydroxypropyl-β-Cyclodextrin and β-Cyclodextrin as Tablet Fillers for Direct Compression. AAPS PharmSciTech 2018; 19:2710-2718. [PMID: 29978292 DOI: 10.1208/s12249-018-1115-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2018] [Accepted: 06/24/2018] [Indexed: 12/28/2022] Open
Abstract
Cyclodextrins are cyclic carbohydrates widely used as complexing and non-complexing excipients in drug delivery systems. The purpose of this work was to study the ability of hydroxypropyl-β-cyclodextrin and β-cyclodextrin to act as tablet fillers for direct compression. In this way, several parameters of the cyclodextrins were evaluated, namely: (i) the flow properties such as angle of repose, flow time, Carr index, and Hausner ratio; (ii) the compaction behavior, specifically the energies and forces exerted during tableting, the plasticity index, the lubrication efficiency, and compression profiles (force/time and work/displacement of the upper punch); and (iii) the influence on carbamazepine release characteristics from uncoated tablets, i.e., dissolution rate and disintegration time. In addition, these properties of the cyclodextrins were compared with those from other commonly used direct compression fillers (lactose monohydrate, mannitol, calcium hydrogen phosphate dihydrate, and microcrystalline cellulose) and co-processed excipients (microcrystalline cellulose/mannitol and lactose monohydrate/cellulose). Three main conclusions can be drawn: (i) the studied cyclodextrins can be used as tablet fillers for direct compression; (ii) hydroxypropyl-β-cyclodextrin showed better properties than β-cyclodextrin mainly at the level of the physics of compression (higher values of plasticity index and lubrication efficiency) and of the drug release characteristics (faster and greater dissolution rate and a shorter disintegration time); and (iii) lactose monohydrate and hydroxypropyl-β-cyclodextrin displayed the best results. As there are people intolerant to lactose, hydroxypropyl-β-cyclodextrin, although its cost is higher, can be considered a good substitute for lactose.
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Conceição J, Adeoye O, Cabral-Marques HM, Lobo JMS. Cyclodextrins as excipients in tablet formulations. Drug Discov Today 2018; 23:1274-1284. [DOI: 10.1016/j.drudis.2018.04.009] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2018] [Revised: 03/14/2018] [Accepted: 04/16/2018] [Indexed: 12/11/2022]
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Estanqueiro M, Amaral MH, Conceição J, Sousa Lobo JM. Nanotechnological carriers for cancer chemotherapy: The state of the art. Colloids Surf B Biointerfaces 2015; 126:631-48. [DOI: 10.1016/j.colsurfb.2014.12.041] [Citation(s) in RCA: 149] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 12/15/2014] [Accepted: 12/22/2014] [Indexed: 12/19/2022]
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Estanqueiro M, Conceição J, Amaral MH, Sousa Lobo JM. Characterization, sensorial evaluation and moisturizing efficacy of nanolipidgel formulations. Int J Cosmet Sci 2014; 36:159-66. [PMID: 24772476 DOI: 10.1111/ics.12109] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND Nanostructured lipid carriers (NLC) have been widely studied for cosmetic and dermatological applications due to their favourable properties that include the formation of an occlusive film on the skin surface that reduces the transepidermal water loss (TEWL) and increase in water content in the skin which improves the appearance on healthy human skin and reduces symptoms of some skin disorders like eczema. OBJECTIVE The main objective of this study was the development of semisolid formulations based NLC with argan oil or jojoba oil as liquid lipids, by addition of Carbopol®934 or Carbopol®980 as gelling agents, followed by comparison between instrumental analysis and sensorial evaluation and in vivo efficacy evaluation. METHODS Nanostructured lipid carriers dispersions were produced by the ultrasound technique, and to obtain a semisolid formulation, gelling agents were dispersed in the aqueous dispersion. Particle size, polydispersity index and zeta potential were determined. Instrumental characterization was performed by rheological and textural analysis; the sensorial evaluation was also performed. Finally, skin hydration and TEWL were studied by capacitance and evaporimetry evaluation, respectively. RESULTS Particles showed a nanometric size in all the analysed formulations. All the gels present pseudoplastic behaviour. There is a correspondence between the properties firmness and adhesiveness as determined by textural analysis and the sensory evaluation. The formulations that showed a greater increase in skin hydration also presented appropriate technological and sensorial attributes for skin application. CONCLUSIONS Nanolipidgel formulations with the addition of humectants are promising systems for cosmetic application with good sensory and instrumental attributes and moisturizing efficacy.
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Laires P, Conceição J, Araújo F, Dores J, Silva C, Radican L, Nogueira AM. Hipos-Er (Hypoglycemia in Portugal Observational Study - Emergency Room): Costs And Health Care Resource Consumption Data. Value Health 2014; 17:A352. [PMID: 27200686 DOI: 10.1016/j.jval.2014.08.739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- P Laires
- Merck Sharp & Dohme, Oeiras, Portugal
| | | | - F Araújo
- Hospital Beatriz Ângelo, Loures, Portugal
| | - J Dores
- Hospital de Santo António, Porto, Portugal
| | - C Silva
- Eurotrials, Lisbon, Portugal
| | - L Radican
- Merck & Co., Inc., Whitehouse Station, NJ, USA
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Conceição J, Laires P, Araújo F, Dores J, Vicente V, Silva C, Carr R, Brodovicz K, Radican L, Nogueira AM. Factors Associated with Hospitalization of Type 2 Diabetic Patients with Hypoglycemic Episodes Assisted at Emergency Departments. Value Health 2014; 17:A337. [PMID: 27200605 DOI: 10.1016/j.jval.2014.08.653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
| | - P Laires
- Merck Sharp & Dohme, Oeiras, Portugal
| | - F Araújo
- Hospital Beatriz Ângelo, Loures, Portugal
| | - J Dores
- Hospital de Santo António, Porto, Portugal
| | | | - C Silva
- Eurotrials, Lisbon, Portugal
| | - R Carr
- Merck Sharp & Dohme, Ballerup, Denmark
| | | | - L Radican
- Merck & Co., Inc., Whitehouse Station, NJ, USA
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Conceição J, Dores J, Araújo F, Laires P, Carr R, Brodovicz K, Radican L, Nogueira AM. Hipos-ER (Hypoglycemia in Portugal Observational Study - Emergency Room): Clinical Outcomes in the Emergency Room. Value Health 2014; 17:A332. [PMID: 27200577 DOI: 10.1016/j.jval.2014.08.626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
| | - J Dores
- Hospital de Santo António, Porto, Portugal
| | - F Araújo
- Hospital Beatriz Ângelo, Loures, Portugal
| | - P Laires
- Merck Sharp & Dohme, Oeiras, Portugal
| | - R Carr
- Merck Sharp & Dohme, Ballerup, Denmark
| | | | - L Radican
- Merck & Co., Inc., Whitehouse Station, NJ, USA
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Laires P, Conceição J, Dores J, Araújo F, Silva C, Radican L, Nogueira AM. Cost Analysis of Severe Hypoglycemia in Treated Type 2 Diabetic Patients According to Anti-Hyperglycemic Agent Therapy. Value Health 2014; 17:A352-A353. [PMID: 27200685 DOI: 10.1016/j.jval.2014.08.740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- P Laires
- Merck Sharp & Dohme, Oeiras, Portugal
| | | | - J Dores
- Hospital de Santo António, Porto, Portugal
| | - F Araújo
- Hospital Beatriz Ângelo, Loures, Portugal
| | - C Silva
- Eurotrials, Lisbon, Portugal
| | - L Radican
- Merck & Co., Inc., Whitehouse Station, NJ, USA
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Conceição J, Laires P, Dores J, Araújo F, Carr R, Brodovicz K, Radican L, Vicente V, Nogueira AM. Hipos-ER (Hypoglycemia in Portugal Observational Study - Emergency Room): Outcomes with Different Anti-Hyperglycemic Agents. Value Health 2014; 17:A332. [PMID: 27200576 DOI: 10.1016/j.jval.2014.08.625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
| | - P Laires
- Merck Sharp & Dohme, Oeiras, Portugal
| | - J Dores
- Hospital de Santo António, Porto, Portugal
| | - F Araújo
- Hospital Beatriz Ângelo, Loures, Portugal
| | - R Carr
- Merck Sharp & Dohme, Ballerup, Denmark
| | | | - L Radican
- Merck & Co., Inc., Whitehouse Station, NJ, USA
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Conceição J, Dores J, Araújo F, Laires P, Carr R, Brodovicz K, Radican L, Nogueira AM. Hipos-ER (Hypoglycemia in Portugal Observational Study - Emergency Room): Clinical Outcomes in Admitted Patients. Value Health 2014; 17:A332. [PMID: 27200579 DOI: 10.1016/j.jval.2014.08.628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
| | - J Dores
- Hospital de Santo António, Porto, Portugal
| | - F Araújo
- Hospital Beatriz Ângelo, Loures, Portugal
| | - P Laires
- Merck Sharp & Dohme, Oeiras, Portugal
| | - R Carr
- Merck Sharp & Dohme, Ballerup, Denmark
| | | | - L Radican
- Merck & Co., Inc., Whitehouse Station, NJ, USA
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Laires P, Conceição J, Araújo F, Dores J, Silva C, Radican L, Nogueira AM. Costs of Hospitalization of Type 2 Diabetic Patients Associated with Severe Hypoglycemia. Value Health 2014; 17:A352. [PMID: 27200689 DOI: 10.1016/j.jval.2014.08.737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- P Laires
- Merck Sharp & Dohme, Oeiras, Portugal
| | | | - F Araújo
- Hospital Beatriz Ângelo, Loures, Portugal
| | - J Dores
- Hospital de Santo António, Porto, Portugal
| | - C Silva
- Eurotrials, Lisbon, Portugal
| | - L Radican
- Merck & Co., Inc., Whitehouse Station, NJ, USA
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Estanqueiro M, Conceição J, Amaral MH, Lobo JMS. Use of solid dispersions to increase stability of dithranol in topical formulations. BRAZ J PHARM SCI 2014. [DOI: 10.1590/s1984-82502014000300018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The present study was planned to improve the stability of dithranol using solid dispersions (SD). Two different SD at a 1:9 ratio of dithranol/excipient were prepared: one of them using glyceryl behenate as excipient and the other using a mixture of argan oil with stearic acid (1:8 ratio) as excipient. Pure dithranol and SD of dithranol were incorporated in an oil-in-water cream and in a hydrophobic ointment in a drug/dermatological base ratio of 1:10. The physical and mechanical properties of semisolid formulations incorporating the pure drug and the developed SD were evaluated through rheological and textural analysis. To evaluate the stability, L*a*b* color space parameters of SD and semisolid formulations, and pH of hydrophilic formulations were determined at defined times, during one month. Each sample was stored at different conditions namely, light exposure (room temperature), high temperature exposition (37 °C) (protected from light) and protected from light (room temperature). Despite higher values of firmness and adhesiveness, hydrophobic ointment exhibited the best rheological features compared to the oil-in-water cream, namely a shear-thinning behavior and high thixotropy. These formulations have also presented more stability, with minor changes in L*a*b* color space parameters. The results of this study indicate that is possible to conclude that the developed SD contributed to the increased stability of dithranol.
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Estanqueiro M, Conceição J, Amaral MH, Santos D, Silva JB, Lobo JMS. Characterization and stability studies of emulsion systems containing pumice. BRAZ J PHARM SCI 2014. [DOI: 10.1590/s1984-82502014000200016] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Emulsions are the most common form of skin care products. However, these systems may exhibit some instability. Therefore, when developing emulsions for topical application it is interesting to verify whether they have suitable physical and mechanical characteristics and further assess their stability. The aim of this work was to study the stability of emulsion systems, which varied in the proportion of the emulsifying agent cetearyl alcohol (and) sodium lauryl sulfate (and) sodium cetearyl sulfate (LSX), the nature of the oily phase (decyl oleate, cyclomethicone or dimethicone) and the presence or absence of pumice (5% w/w). While maintaining the samples at room temperature, rheology studies, texture analysis and microscopic observation of formulations with and without pumice were performed. Samples were also submitted to an accelerated stability study by centrifugation and to a thermal stress test. Through the testing, it was found that the amount of emulsifying agent affects the consistency and textural properties such as firmness and adhesiveness. So, formulations containing LSX (5% w/w) and decyl oleate or dimethicone as oily phase had a better consistency and remained stable with time, so exhibited the best features to be used for skin care products.
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Marcelino M, Nobre E, Conceição J, Lopes L, Vilar H, França Martins M, Carvalho A, André S, Horta A, De Castro JJ. [A rare case of hyperandrogenism: bilateral Leydig cell tumor of the ovary]. ACTA MEDICA PORT 2010; 23:113-118. [PMID: 20353714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2008] [Accepted: 04/23/2009] [Indexed: 05/29/2023]
Abstract
BACKGROUND The androgen-secreting tumors constitute fewer than 1% of ovarian tumors. Leydig cell tumor is one of the most common of this type of lesion and it is usually benign, small and unilateral. CASE REPORT A 67 year old woman was referred to the Endocrine clinic due to hirsutism (score 22 Ferriman-Gallwey) and male type alopecia with 3 years of evolution and progressive worsening. Biochemically she had high levels of serum testosterone - 662 ng/dl (N < 62 ng/dl). Transvaginal ultrasonography and abdomen-pelvic CT scan didn't show any signs of adrenal or ovarian tumors. Bilateral oophorectomy was performed and histopathologic exam revealed bilateral Leydig cell tumors, measuring 1cm each. Four months after surgery, the patient had a marked improvement of the signs (score 3 Ferriman-Gallwey) and normalized testosterone levels (35.9 ng/dl). DISCUSSION Androgen-secreting tumors are rare, but they should be excluded in cases of rapid onset of virilization and elevated androgen levels. Tumors are frequently undetectable by imaging techniques because of their small dimensions, exploratory surgery by a skilled team is frequently necessary and is often the best treatment for the majority of these cases. In this case report we present a rare case of bilateral Leydig cell tumor. Only five cases have been reported in the literature.The clinical history and the elevated levels of testosterone had suggested the presence of an androgen-producing tumor, despite the difficulty of the diagnosis on imaging techniques. Due to the fact that our patient was in a post-menopausal stage, we decided that the appropriate treatment would be bilateral oophorectomy. The histopathologic disclosed the diagnosis and allowed the patient's cure.
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Affiliation(s)
- M Marcelino
- Serviço de Endocrinologia, Hospital Militar Principal, Lisboa
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Marcelino M, Nobre EL, Conceição J, Lopes L, Vilar H, Jácome De Castro J. [Superior vena cava syndrome and intrathoracic goiter: an unusual presentation in the 21st century]. ACTA MEDICA PORT 2009; 22:299-302. [PMID: 19686631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We present a rare case of retrosternal goiter complicated with superior vena cava síndrome (SVCS) with impressive clinical signs. After clinical and imagiologic confirmation, total thyroidectomy was performed with complete remission of compressive signs.
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21
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Liyanage R, Conceição J, Armentrout PB. Guided ion beam studies of the reactions of Vn+ (n=2–13) with D2: Cluster–deuteride bond energies as a chemical probe of cluster electronic structure. J Chem Phys 2002. [DOI: 10.1063/1.1428342] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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Branco L, Pitta ML, Galrinho A, Real HC, da Cruz AG, Conceição J, Morgado V, Gonçalves JM, Antunes AM. A rare cause of late infective endocarditis after heart surgery. J Am Soc Echocardiogr 1997; 10:371-4. [PMID: 9168361 DOI: 10.1016/s0894-7317(97)70076-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A case is reported of a male patient with rheumatic mitral valve disease and open mitral valve commissurotomy, performed 13 years before, who had fever and multiple septic embolic events. Serial blood cultures were positive for Pseudomonas aeruginosa. Transthoracic and transesophageal echocardiography demonstrated the presence of an irregular, round, very mobile mass inserted in the fossa ovalis region of the interatrial septum. After resolution of the infectious process, surgery was performed. The structure previously described corresponded to a elongated suture material covered by fibrin. It had been secondarily infected and it was the cause of the entire process.
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Affiliation(s)
- L Branco
- Department of Cardiology, Santa Marta Hospital, Lisbon Portugal
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23
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Conceição J, Loh SK, Lian L, Armentrout PB. Guided ion beam studies of the reactions of Fe+n(n=2–15) with D2: Cluster–deuteride bond energies as a chemical probe of cluster structures. J Chem Phys 1996. [DOI: 10.1063/1.471253] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Coura JR, Conceição J, dos Santos ML, de Mendonça ZG, Cutrim RN. Cross-sectional and evolutive studies of schistosomiasis mansoni in untreated and mass treated endemic areas in the southeast and northeast of Brazil. Mem Inst Oswaldo Cruz 1994; 87 Suppl 4:175-82. [PMID: 1343891 DOI: 10.1590/s0074-02761992000800027] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Cross-sectional and evolutive studies on schistosomiasis mansoni were carried out before and after mass treatment in the endemic areas of Capitão Andrade and Padre Paraiso, state of Minas Gerais, Riachuelo, state of Sergipe, Alhandra, state of Paraiba, and Aliança, Alegre and Coroatá, lowland of the state of Maranhão, Brazil, in the last eighteen years. The studies included clinical and fecal examination by the Kato-Katz quantitative technique, skin test for Schistosoma mansoni infection, evaluation of man-water contact and other epidemiological investigations such as infection rate and dynamic of the snail population. Results showed: (1) Higher prevalence of S. mansoni infection, greater egg load elimination and higher and earlier morbidity of the chronic forms of the disease in the southeast areas of Capitão Andrade and Padre Paraiso; (2) The incidence of hepatosplenic form is higher in some family clusters, in whites and mulattos in all the endemic areas but develop earlier in the southeast; (3) The prevalence and morbidity of schistosomiasis are decreasing both in the mass treated northeast and in the untreated southeast areas; (4) The mass treatment reduces rapidly the prevalence of the infection and the morbidity of the disease but can not control it because of the frequent reinfections due to the intensity of man-water contact.
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Affiliation(s)
- J R Coura
- Departamento de Medicina Tropical, Instituto Oswaldo Cruz, Rio de Janeiro, Brasil
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