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1.
Drug Dev Ind Pharm ; 47(8): 1335-1341, 2021 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-34622736

RESUMO

OBJECTIVE: The goals of this study were to (1) delineate a technique to prepare stable aqueous vitamin E/Soluplus® dispersions; (2) characterize films cast from the aqueous dispersions; and (3) demonstrate the utility of the aqueous dispersions in fluid bed coating applications. This study demonstrated the feasibility of using vitamin E in the preparation of amphiphilic film withs potential use in delayed-release coating applications. METHODS: Low viscosity aqueous vitamin E/Soluplus® dispersions were prepared by first spray drying ethanolic vitamin E/Soluplus® solutions followed by high-shear homogenization of the solid dispersions in water. Concentrated (10%) aqueous dispersions containing 0%, 10%, 20%, and 30% of vitamin E in the binary blend with Soluplus® were then cast into films and characterized for contact angle and mechanical strength by texture analysis. RESULTS: All films were hydrophilic and homogenous, which confirmed the utility of vitamin E as a plasticizer for the Soluplus® polymer. The 0% and 10% films were brittle whereas the 30% were tacky. The 20% dispersion was subsequently used to coat acetaminophen granules by a fluidized bed process to a dry weight gain of 10-30%. When tested by a dissolution study, a delay in acetaminophen release was observed as a function of weight gain. CONCLUSION: The results from this study demonstrated that it is feasible to produce stable vitamin E/Soluplus® aqueous dispersions to be used as solvent-free functional film coating materials.


Assuntos
Acetaminofen , Vitamina E , Humanos , Polietilenoglicóis , Polivinil , Solubilidade , Água , Aumento de Peso
2.
Pharm Dev Technol ; 26(10): 1102-1109, 2021 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34645368

RESUMO

The objective of the present study was to investigate the feasibility of formulating and loading Curcumin SEDDS (Self-Emulsified Drug Delivery Systems) into films made from Soluplus® as the film-forming polymer. Films with up to 30% of Curcumin SEDDS were prepared by the solvent casting technique and analyzed for their mechanical and dissolution properties. A nine-run, two-factor, three-level factorial design was utilized to investigate the effect of SEDDS load (10, 20, and 30% w/w) and film thickness (10, 25, and 40 mils) on the tensile strength, elongation, and adhesiveness of the films. The dissolution profile of the films was also investigated by a USP Type 1 method. SEDDS loading was found to plasticize Soluplus® and to yield transparent films of good mechanical properties. Increasing SEDDS load, however, was found to reduce the tensile strength of the films, while increasing their adhesiveness and elongation. On the other hand, while an increase in film thickness was found to increase the tensile strength of the films, it reduced the elongation capacity of the films. Loading SEDDS into Soluplus® films was also found to sustain their release over 6 h, where a significant delay in release was found at lower SEDDS loads. This study demonstrated that Soluplus® can be used not only to formulate SEDDS into polymeric films but also to sustain their release over an extended time.


Assuntos
Curcumina , Preparações de Ação Retardada , Sistemas de Liberação de Medicamentos , Emulsões , Polietilenoglicóis , Polivinil , Solubilidade , Solventes
3.
Drug Dev Ind Pharm ; 46(4): 539-546, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32090628

RESUMO

Objective: Developing chewing gum tablets (CGTs) with high drug loads is a challenge due to the loss of mastication properties. We postulated that poor mastication properties of such gums could be improved by adjusting the concentration of liquid flavors to serve as plasticizers and consequently increase the flexibility of the elastomer in the gum base. To test this hypothesis, the objective of this work was to evaluate the effects of flavor type and concentration, and storage conditions on the textural properties of CGTs loaded with 20% curcumin (CUR) by weight.Methods: CGTs were made by directly compressing Health in Gum® base with CUR. The resultant CGTs were characterized by single and two bites textural tests to measure their yield strength, post-bite failure rate, and compressibility.Results: Flavor concentration (X2) had a significant impact on the masticatory properties of the chewing gums, which could be ascribed to the plasticizing effect of peppermint oil. Addition of liquid flavors and storage at low temperature (X4) produced CGTs with the desirable properties of low yield strength (Y1) and post-bite structural failure rate (Y2), and high compressibility (Y3). The effect of flavors however was negated at high temperatures, especially when flavored gums were stored for extended time at 50 °C. Flavor type (X1) on the other hand had no effect on the masticatory properties of the chewing gums.Conclusions: This study concluded that it is feasible to formulate CGTs with high solids content without negatively impacting their mechanical properties by controlling the concentration of liquid flavors.


Assuntos
Goma de Mascar , Curcumina/administração & dosagem , Composição de Medicamentos/métodos , Aromatizantes/química , Plastificantes/química , Administração Oral , Química Farmacêutica , Sistemas de Liberação de Medicamentos , Elastômeros/química , Estudos de Viabilidade , Mastigação , Mentha piperita , Óleos de Plantas/química , Projetos de Pesquisa , Comprimidos , Paladar
4.
Pharm Dev Technol ; 25(4): 510-516, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31858867

RESUMO

Tocosol™ is a tocopherol-based paclitaxel (PTX) nanoemulsion consisting of α-tocopherol (α-T) isomer of vitamin E as a solubilizer and vitamin E TPGS as the primary emulsifier. Despite its positive attributes in early clinical studies, it failed the pivotal phase III clinical trials. The long-term goal of this work was to reformulate Tocosol™. In this study, Tocosol™ formulation was optimized by replacing the α-T isomer with the more pharmacological active isomer γ-tocotrienol (γ-T3), and the surfactant vitamin E TPGS was replaced with in-house designed PEGylated γ-T3 surfactant. The reformulated paclitaxel γ-T3/PEGylated γ-T3 -based nanoemulsion was significantly more active against pancreatic tumor cell lines than α-T/Vitamin E TPGS based formulation (IC50 = 0.5 µM and 1.1 µM, respectively). Furthermore, the reformulated product showed an average size of 220 ± 6 nm with surface charge equal to -42 ± 2 mV. The optimized product was physically and chemically stable over 6 months per ICH storage condition guidelines.


Assuntos
Antineoplásicos/administração & dosagem , Cromanos/química , Emulsões/química , Paclitaxel/administração & dosagem , Vitamina E/análogos & derivados , Antineoplásicos/farmacologia , Linhagem Celular Tumoral , Humanos , Paclitaxel/farmacologia , Neoplasias Pancreáticas/tratamento farmacológico , Polietilenoglicóis/química , Tensoativos/química , Vitamina E/química
5.
AAPS PharmSciTech ; 19(7): 2908-2920, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30088152

RESUMO

Medicated chewing gums (MCGs) represent a unique platform for drug delivery. They have been defined as solid single-dose preparations, which may contain more than one active pharmaceutical ingredient (API) with base consisting primarily of gum that has to be chewed for a certain period of time. They mainly contain a tasteless masticatory gum base as the core with other minor nonmasticatory ingredients, such as flavors and sweeteners. Despite their advantages in drug delivery, MCGs remain a niche product due to the complexity of their formulation, lack of acceptable testing methods, and intricacy of their manufacturing. Few studies have been reported on their use, and most of the information on their composition and production could be found in patent search. The aim of this review is to provide an overview of gum composition, manufacturing process, and characterization. Due to the scarcity of studies concerning the evaluation of the mechanical properties of MCGs, greater emphasis was placed on the available performance tests and procedures for the estimation of their mechanical and textural properties. While very few tests have been recommended by the official pharmacopeias, several tests have been suggested for assessing the mechanical properties of MCGs in vitro. Properties, such as chewiness, elasticity, and firmness, of chewing gums during mastication are imperative quality attributes that have been found to strongly correlate with gum composition and mouth feel.


Assuntos
Goma de Mascar/análise , Goma de Mascar/normas , Sistemas de Liberação de Medicamentos/normas , Sistemas de Liberação de Medicamentos/métodos , Elasticidade , Emulsificantes/análise , Emulsificantes/síntese química , Emulsificantes/normas , Fenômenos Mecânicos , Preparações Farmacêuticas/análise , Preparações Farmacêuticas/síntese química , Preparações Farmacêuticas/normas , Resistência à Tração
6.
AAPS PharmSciTech ; 19(8): 3742-3750, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30255470

RESUMO

Curcumin chewing gums could be therapeutically beneficial if used by the head and neck cancer patients. High curcumin loading in chewing gums however is needed to achieve desired therapeutic effect. Preparing gums with high drug load is nonetheless challenging because of the negative impact of solids on their masticatory properties. The use of liquid flavors was found to partially solve this problem. The objectives of this study were to (1) determine the maximum amount of curcumin that can be loaded into co-compressed chewing gums made from Health in Gum® as the base and flavored with 1.5% peppermint oil, (2) determine if addition of sweeteners can improve the yield strength and compressibility of the gums when examined by a texture analyzer, (3) examine the effect of temperature over a storage period of one month on the physical stability of the chewing gums, and (4) study the impact of substituting curcumin with its inclusion complex with SBE-ß-CD on drug release. It was found that when flavored, Health in Gum® could load up to 25% curcumin by weight without compromising its masticatory properties. When tested for drug release, SBE-ß-CD was found to significantly increase the amount of curcumin dissolved within 30 min. Despite poor drug release from gums loaded with insoluble curcumin, the fragmentation of the gums during mastication by the Erweka tester is nonetheless expected to produce a suspension for absorption in the lower GIT. This study demonstrated how modulating gum composition and storage conditions can impact the mechanical properties of chewing gums with high solids content.


Assuntos
Química Farmacêutica/métodos , Goma de Mascar , Força Compressiva , Curcumina/síntese química , Excipientes/síntese química , beta-Ciclodextrinas/síntese química , Curcumina/metabolismo , Liberação Controlada de Fármacos , Excipientes/metabolismo , Solubilidade , Comprimidos , beta-Ciclodextrinas/metabolismo
7.
Biomed Chromatogr ; 31(9)2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28205290

RESUMO

Paclitaxel is a front-line antineoplastic drug used in chemotherapeutic modalities for treatment of various types of malignancies. However, its efficacy is limited by dose-related toxicities. In this study, we have explored two important biological aspects of entrapping paclitaxel in PEG2000 -DSPE micelles. First, we evaluated the impact of this micellar delivery system on P-glycoprotein (P-gp)-paclitaxel interaction, and we investigated differences in plasma pharmacokinetics of free and micelle-entrapped paclitaxel. For quantification of paclitaxel, an LC-MS/MS method was developed. Paclitaxel was extracted from samples using a simple one-step protein precipitation. Chromatographic conditions included a C18 column with a mobile phase consisting of 0.1% formic acid in acetonitrile-water (60:40, v/v) pumped at 1 mL/min. The lower limit of quantitation in both plasma and cell lysate was 1.0 ng/mL. The quantitative linear range was 1-1000 ng/mL. In addition, P-gp efflux studies on free and micellar paclitaxel showed the proficiency of PEG2000 -DSPE micelles in evading P-gp-mediated efflux, thus increasing paclitaxel uptake. Furthermore, the micellar paclitaxel levels were maintained in the body for longer time as compared with taxol, which is desirable for increasing the efficacy of paclitaxel in cancer treatment.


Assuntos
Cromatografia Líquida/métodos , Micelas , Paclitaxel/análise , Espectrometria de Massas em Tandem/métodos , Células A549 , Animais , Humanos , Modelos Lineares , Masculino , Paclitaxel/química , Fosfatidiletanolaminas/química , Polietilenoglicóis/química , Ratos , Ratos Sprague-Dawley , Reprodutibilidade dos Testes , Sensibilidade e Especificidade
8.
J Am Oil Chem Soc ; 94(9): 1209-1217, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-33518766

RESUMO

Vitamin E refers to a family of eight tocopherols (T) and tocotrienol (T3) isomers. Due to the unique pharmacological and anticancer activity of the individual isomers, there is a need to extract and separate the individual T3 isomers from T/T3 rich fractions of palm oil. The objective of the present study was to present a detailed protocol for the extraction of gram quantities of vitamin E isomers from a T3 rich fraction (Tocotrol™) that was obtained from palm oil, by column chromatography using a binary hexane:EtOAc (1-12%) phase system. The chemical integrity and identity of the extracted isomers was confirmed by TLC, HPLC, 1H-NMR, and Raman analysis. To evaluate their anticancer activity, vitamin E isomers were first entrapped into nanoemulsions and then tested against a panel of breast and pancreatic cancer cell lines. Nanoemulsions were prepared by the solvent evaporation technique. They had an average droplet size between 156-200 nm. In confirmation to what has been reported in the literature, γ-T3 and δ-T3 isomers were found to be significantly more active against tumor cells than the α-T and α-T3 isomers. The current study has demonstrated the feasibility of extracting the individual vitamin E isomers at high yields from natural sources while maintaining their chemical integrity and pharmacological activity.

9.
AAPS PharmSciTech ; 17(2): 418-26, 2016 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-26202065

RESUMO

The objective of this study was to investigate the pH-dependent solubility and dissolution of weakly basic Biopharmaceutical Classification Systems (BCS) class II drugs, characterized by low solubility and high permeability, using carvedilol, a weak base with a pK a value of 7.8, as a model drug. A series of solubility and in vitro dissolution studies was carried out using media that simulate the gastric and intestinal fluids and cover the physiological pH range of the GI from 1.2 to 7.8. The effect of ionic strength, buffer capacity, and buffer species of the dissolution media on the solubility and dissolution behavior of carvedilol was also investigated. The study revealed that carvedilol exhibited a typical weak base pH-dependent solubility profile with a high solubility at low pH (545.1-2591.4 µg/mL within the pH range 1.2-5.0) and low solubility at high pH (5.8-51.9 µg/mL within the pH range 6.5-7.8). The dissolution behavior of carvedilol was consistent with the solubility results, where carvedilol release was complete (95.8-98.2% released within 60 min) in media simulating the gastric fluid (pH 1.2-5.0) and relatively low (15.9-86.2% released within 240 min) in media simulating the intestinal fluid (pH 6.5-7.8). It was found that the buffer species of the dissolution media may influence the solubility and consequently the percentage of carvedilol released by forming carvedilol salts of varying solubilities. Carvedilol solubility and dissolution decreased with increasing ionic strength, while lowering the buffer capacity resulted in a decrease in carvedilol solubility and dissolution rate.


Assuntos
Carbazóis/química , Propanolaminas/química , Solubilidade , Biofarmácia/métodos , Soluções Tampão , Carvedilol , Mucosa Gástrica/metabolismo , Concentração de Íons de Hidrogênio , Absorção Intestinal , Mucosa Intestinal/metabolismo , Concentração Osmolar , Permeabilidade
10.
Pharm Dev Technol ; 20(1): 41-9, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-24160864

RESUMO

The aim of this study was to develop thermosensitive gels using poloxamers for topical delivery of fluconazole (FLZ). Eight different formulations containing 1% FLZ in poloxamer and a particular co-solvent (propylene glycol (PG) or Transcutol-P) of various concentrations were prepared. The gels were characterized for transition temperatures, rheological and mechanical properties. FLZ permeability and antifungal effect of the gels were also evaluated. Except for one formulation, all gels exhibited thermosensitive property, i.e. transformed from Newtonian (liquid-like) behavior at 20 °C to non-Newtonian (gel-like) behavior at 37 °C. Transcutol-P increased the transition temperature of the formulations, while the opposite effect was observed for PG. At 37 °C, formulations with high poloxamer concentrations (17%) resulted in high viscosity, compressibility and hardness. Formulations containing 17% poloxamer and 20% Transcutol-P and 10% PG, respectively, exhibited high adhesiveness. No significant differences in the in vitro antifungal activity of FLZ were observed among the formulations suggesting that the gel vehicles did not influence the biological effect of FLZ. FLZ permeability decreased with increasing poloxamer concentration. Formulations containing 17% poloxamer and 20% Transcutol-P and 10% PG seemed to be promising in situ gelling systems for the topical delivery of FLZ.


Assuntos
Antifúngicos/administração & dosagem , Antifúngicos/farmacologia , Fluconazol/administração & dosagem , Fluconazol/farmacologia , Anti-Infecciosos Locais , Antifúngicos/química , Candida albicans/efeitos dos fármacos , Química Farmacêutica , Elasticidade , Excipientes , Fluconazol/química , Géis , Fenômenos Mecânicos , Testes de Sensibilidade Microbiana , Reologia , Solubilidade , Temperatura , Temperatura de Transição , Viscosidade
11.
Pharm Dev Technol ; 20(5): 555-61, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-24621375

RESUMO

Recently there has been a growing interest in vitamin E for its potential use in cancer therapy. The objective of this work was therefore to formulate a physically stable parenteral lipid emulsion to deliver higher doses of vitamin E than commonly used in commercial products. Specifically, the objectives were to study the effects of homogenization pressure, number of homogenizing cycles, viscosity of the oil phase, and oil content on the physical stability of emulsions fortified with high doses of vitamin E (up to 20% by weight). This was done by the use of a 27-run, 4-factor, 3-level Box-Behnken statistical design. Viscosity, homogenization pressure, and number of cycles were found to have a significant effect on particle size, which ranged from 213 to 633 nm, and on the percentage of vitamin E remaining emulsified after storage, which ranged from 17 to 100%. Increasing oil content from 10 to 20% had insignificant effect on the responses. Based on the results it was concluded that stable vitamin E rich emulsions could be prepared by repeated homogenization at higher pressures and by lowering the viscosity of the oil phase, which could be adjusted by blending the viscous vitamin E with medium-chain triglycerides (MCT).


Assuntos
Antioxidantes/química , Emulsões Gordurosas Intravenosas/química , Lipídeos/química , Vitamina E/química , Química Farmacêutica/métodos , Estabilidade de Medicamentos , Humanos , Neoplasias/terapia , Tamanho da Partícula , Triglicerídeos/química , Viscosidade
12.
Org Biomol Chem ; 12(28): 5295-303, 2014 Jul 28.
Artigo em Inglês | MEDLINE | ID: mdl-24927150

RESUMO

Breast and prostate cancers are among the most common cancers worldwide with devastating statistics for the metastatic, chemotherapy- and radiotherapy-resistant phenotypes. Novel therapies interfering with new and/or multiple pathways involved in the pathology of cancer are urgently needed. Preliminary results showed that the marine natural product Z-4-hydroxyphenylmethylene hydantoin (PMH, ) and its 4-ethylthio-analog (SEth, ) promoted tight junction formation and showed anti-invasive and anti-migratory activities in vitro against metastatic prostate cancer cells and inhibited tumor growth and micrometastases in distant organs in orthotopic and transgenic mice models. This study focuses on the design and synthesis of second-generation PMHs with enhanced antitumor activities. A series of substituted benzaldehydes was selected based on earlier SAR studies and reacted with hydantoin to yield 11 new compounds . Compounds were evaluated for their antiproliferative, antimigratory and anti-invasive properties in vitro against the human mammary and prostate cancer cell lines MDA-MB-231 and PC-3, respectively. A Western blot analysis of the most active analog showed its ability to suppress the expression of the total levels of c-Met and FAK, with subsequent reduction of their phosphorylated (activated) levels in MDA-MB-231 cells. In addition, also inhibited Brk, paxillin and Rac1 phosphorylation. was formulated using hydroxypropyl ß-cyclodextrin (HPCD) to improve its solubility and was further evaluated in a nude mice xenograft model using MDA-MB-231/GFP cells. PMH reduced breast tumor growth and suppressed Ki-67, CD31, p-Brk and p-FAK expression in tumor samples. Thus, is a potential lead for the control of invasive breast malignancies.


Assuntos
Antineoplásicos/síntese química , Produtos Biológicos/química , Neoplasias da Mama/tratamento farmacológico , Quinase 1 de Adesão Focal/antagonistas & inibidores , Regulação Neoplásica da Expressão Gênica , Hidantoínas/química , Proteínas de Neoplasias/antagonistas & inibidores , Proteínas Tirosina Quinases/antagonistas & inibidores , Animais , Antineoplásicos/química , Antineoplásicos/farmacologia , Benzaldeídos/química , Neoplasias da Mama/genética , Neoplasias da Mama/metabolismo , Neoplasias da Mama/patologia , Linhagem Celular Tumoral , Movimento Celular/efeitos dos fármacos , Feminino , Quinase 1 de Adesão Focal/genética , Quinase 1 de Adesão Focal/metabolismo , Humanos , Hidantoínas/farmacologia , Masculino , Camundongos , Camundongos Nus , Camundongos Transgênicos , Proteínas de Neoplasias/genética , Proteínas de Neoplasias/metabolismo , Paxilina/genética , Paxilina/metabolismo , Próstata/efeitos dos fármacos , Próstata/metabolismo , Próstata/patologia , Proteínas Tirosina Quinases/genética , Proteínas Tirosina Quinases/metabolismo , Receptores Proteína Tirosina Quinases/genética , Receptores Proteína Tirosina Quinases/metabolismo , Transdução de Sinais , Ensaios Antitumorais Modelo de Xenoenxerto , Proteínas rac1 de Ligação ao GTP/genética , Proteínas rac1 de Ligação ao GTP/metabolismo
13.
J Nanosci Nanotechnol ; 14(5): 4002-5, 2014 May.
Artigo em Inglês | MEDLINE | ID: mdl-24734680

RESUMO

The highly malignant +SA mouse mammary epithelial cells were used as the model cell line over the years to establish the anticancer activity of tocotrienols. Tocotrienols, however, have poor oral bioavailability and were therefore entrapped into parenteral nanoemulsions for parenteral administration. The objective of this work was to test whether the activity of tocotrienols in lipid nanoemulsions against the +SA cells was retained. A secondary objective was to test whether stabilizing the nanoemulsions with poloxamer or sodium oleate would affect their activity. Nanoemulsions were found to be significantly more potent than tocotrienol/albumin conjugate. The IC50 values of the poloxamer and sodium oleate nanoemulsions were 3 and 6 microM, respectively, whereas the IC50 value of the conjugate was 10 microM. The antiproliferative activity of the nanoemulsions was also found to inversely correlate with particle size. No activity was observed with nanoemulsions loaded with alpha-tocopherol or vehicle, which confirmed the cytotoxic activity of tocotrienols and the potential use of nanoemulsions in cancer therapy.


Assuntos
Antineoplásicos/farmacologia , Emulsões , Neoplasias Mamárias Experimentais/patologia , Nanoestruturas , Tocotrienóis/farmacologia , Animais , Cromatografia Líquida de Alta Pressão , Cromatografia de Fase Reversa , Células Epiteliais/efeitos dos fármacos , Feminino , Camundongos , Células Tumorais Cultivadas
14.
Pharm Dev Technol ; 19(1): 125-8, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-23294366

RESUMO

The objective of this study was to investigate the effect of cetyl alcohol (CA) and Tween® 60 (polysorbate), the primary components of emulsifying wax, on the size, zeta potential and stability of cetyltrimethyl ammonium bromide (CTAB)-based solid lipid nanoparticles (SLN) by D-optimal mixture design. A binary CTAB/polysorbate surfactant blend did not offer an advantage over a simple CTAB-stabilized SLN. This led to the conclusion that emulsifying wax could be readily substituted with CA in simple SLNs based on binary CTAB/CA blends. Polysorbate, however, may be added as a co-emulsifier to adjust the physical properties of the nanoparticles, as dictated by the formulator.


Assuntos
Compostos de Cetrimônio/química , Emulsificantes/química , Lipídeos/química , Nanopartículas/química , Ceras/química , Cetrimônio , Álcoois Graxos/química , Polissorbatos/química , Tensoativos/química
15.
Pharm Dev Technol ; 19(3): 342-6, 2014 May.
Artigo em Inglês | MEDLINE | ID: mdl-23590412

RESUMO

The objective of this study was to evaluate the effect of sonication time and pulse frequency on average dispersion temperature (ART), particle size and zeta potential of solid lipid nanoparticles (SLNs). A two-factor, three-level response surface methodology (RSM) was used to optimize sonication time between 5 and 15 min and pulse frequency from 30 to 90%. SLNs made from stearyl alcohol (SA) and cetyl trimethylammonium bromide (CTAB) blend at 1:3 ratio were prepared by applying high-shear homogenization and sonication. Pulse frequency and time were found to have a significant effect on particle size and ART. The effect of sonication parameters on zeta potential, however, was insignificant. The optimal sonication parameters for preparing 100 nm SLNs made from a SA/CTAB blend was 60% pulse frequency at 40% power for 10 min. Optimized sonication parameters were then used to investigate the effect of lipid type on SLN size and zeta potential. The mean particle sizes of SLNs made with SA, cetyl palmitate, Precirol®, Dynasan118® and Compritol® were 98, 190, 350, 350 and 280 nm, respectively. In conclusion, pulse frequency and time were found to be critical for obtaining SLNs with desirable size, whereas the stability of the SLNs was dependent on their lipid content.


Assuntos
Compostos de Cetrimônio/química , Álcoois Graxos/química , Nanopartículas/química , Sonicação , Cetrimônio , Simulação por Computador , Modelos Químicos , Tamanho da Partícula , Solubilidade , Temperatura
16.
Drug Dev Ind Pharm ; 39(2): 363-73, 2013 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-22554350

RESUMO

The objective of this study was to screen the effect of eight formulations and process parameters on the physical attributes and stability of "Vitamin E"-rich parenteral lipid emulsions. Screening was performed using a 12-run, 8-factor, 2-level Plackett-Burman design. This design was employed to construct polynomial equations that identified the magnitude and direction of the linear effect of homogenization pressure, number of homogenization cycles, primary and secondary emulsifiers, pre-homogenization temperature, oil loading, and ratio of vitamin E to medium-chain triglycerides (MCT) in the oil phase on particle size, polydispersity index, short-term stability, and outlet temperature of manufactured emulsions. The viscosity of vitamin E was reduced from 3700 (100%) to 64 mPa.s (30%) by MCT addition. As viscosity is critical for efficient emulsification, vitamin/MCT ratio was the most significant contributor for the stability of emulsions. Particle size increased from 236 to 388 nm, and percentage vitamin remaining emulsified after 48 h dropped from 100 to 73% with increase in vitamin/MCT ratio from 30/70 to 70/30. Significant decrease in particle size and PI, and an increase in outlet temperature were also observed with increase in homogenization pressure and number of homogenization cycles. Emulsifiers and oil loading, however, had insignificant effect on the responses. Overall, stable submicron emulsions at vitamin/MCT ratio of 30/70 could be prepared at 25,000 psi and 25 cycles in ambient conditions. The identification of these parameters by a well-constructed design demonstrated the utility of screening studies in the "Quality by Design" approach to pharmaceutical product development.


Assuntos
Lipídeos/química , Vitamina E/química , Química Farmacêutica/métodos , Estabilidade de Medicamentos , Emulsões/química , Nutrição Parenteral , Tamanho da Partícula , Viscosidade
17.
Drug Dev Ind Pharm ; 39(11): 1681-9, 2013 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-23072611

RESUMO

The objectives of this study were to prepare a powdered self-emulsified (SEDDS) formulation of meloxicam and to compare its oral bioavailability against commercial Mobic tablets. The SEDDS formulation was prepared by in situ salt formation of meloxicam in a blend of lipid excipients and aqueous tris (hydroxymethyl) aminomethane solution. The liquid SEDDS was subsequently adsorbed on silica powder and was tested for size, flow, and crystal growth. The flowability index of the powdered SEDDS was borderline acceptable. Absence of crystal growth with storage was confirmed by DSC and PXRD studies. Dissolution of meloxicam from the powdered SEDDS was >90% vs. <12% for powdered meloxicam and <80% for the commercial tablets. Stability of the powdered formulations after storage in gelatin and HPMC capsules was also evaluated to study the effect of water migration from the fill into capsule shells. Capsules softened to a different extent as a function of fill material with HPMC capsules showing greater resistance to water migration. Finally, oral bioavailability of the formulations was evaluated in beagle dogs. Powdered meloxicam SEDDS formulation showed a 1.3-fold increase in AUC vs. commercial Mobic® tablets. Overall, this study described a novel SEDDS formulation of meloxicam and outlined a systematic approach to adsorbing and testing the flow and stability behavior of powdered SEDDS formulations.


Assuntos
Anti-Inflamatórios não Esteroides/química , Antirreumáticos/química , Inibidores de Ciclo-Oxigenase/química , Excipientes/química , Lipídeos/química , Tiazinas/química , Tiazóis/química , Administração Oral , Animais , Animais Endogâmicos , Anti-Inflamatórios não Esteroides/administração & dosagem , Anti-Inflamatórios não Esteroides/sangue , Anti-Inflamatórios não Esteroides/farmacocinética , Antirreumáticos/administração & dosagem , Antirreumáticos/sangue , Antirreumáticos/farmacocinética , Disponibilidade Biológica , Cápsulas , Fenômenos Químicos , Inibidores de Ciclo-Oxigenase/administração & dosagem , Inibidores de Ciclo-Oxigenase/sangue , Inibidores de Ciclo-Oxigenase/farmacocinética , Cães , Composição de Medicamentos , Estabilidade de Medicamentos , Armazenamento de Medicamentos , Emulsões , Meloxicam , Tamanho da Partícula , Pós , Dióxido de Silício/química , Solubilidade , Tiazinas/administração & dosagem , Tiazinas/sangue , Tiazinas/farmacocinética , Tiazóis/administração & dosagem , Tiazóis/sangue , Tiazóis/farmacocinética , Trometamina/química
18.
Pharm Dev Technol ; 18(6): 1355-60, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-22780708

RESUMO

The objective of this work was to study the dissolution and mechanical properties of fast-dissolving films prepared from a tertiary mixture of pullulan, polyvinylpyrrolidone and hypromellose. Disintegration studies were performed in real-time by probe spectroscopy to detect the onset of film disintegration. Tensile strength and elastic modulus of the films were measured by texture analysis. Disintegration time of the films ranged from 21 to 105 seconds whereas their mechanical properties ranged from approximately 2 to 49 MPa for tensile strength and 1 to 21 MPa% for young's modulus. After generating polynomial models correlating the variables using a D-Optimal mixture design, an optimal formulation with desired responses was proposed by the statistical package. For validation, a new film formulation loaded with diclofenac sodium based on the optimized composition was prepared and tested for dissolution and tensile strength. Dissolution of the optimized film was found to commence almost immediately with 50% of the drug released within one minute. Tensile strength and young's modulus of the film were 11.21 MPa and 6, 78 MPa%, respectively. Real-time spectroscopy in conjunction with statistical design were shown to be very efficient for the optimization and development of non-conventional intraoral delivery system such as fast dissolving films.


Assuntos
Química Farmacêutica/métodos , Diclofenaco/química , Módulo de Elasticidade , Glucanos/química , Derivados da Hipromelose , Metilcelulose/análogos & derivados , Metilcelulose/química , Povidona/química , Projetos de Pesquisa , Solubilidade , Resistência à Tração
19.
J Cosmet Sci ; 64(1): 9-17, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23449127

RESUMO

The objective of this study was to develop and characterize a liposome delivery system coencapsulating two cosmeceutical ingredients, avobenzone (AVO) and arbutin (AR). Two different liposome preparation methods, that is, thin film hydration and reverse-phase evaporation, were evaluated. To obtain the optimal formulation, various ratios of lipid to AVO or AR were tested. The effects of liposome formulation and preparation method on particle size, entrapment efficiency (EE), and skin permeation rate were studied. The mean particle size of the liposome formulations obtained by the thin film hydration method was smaller than that obtained by the reverse-phase evaporation method. The EE of AR and AVO in liposomes prepared by the thin film method, however, was lower than that prepared by the reverse-phase evaporation method. No differences in membrane permeation were observed between the two preparation methods. A large portion of AR permeated through the membrane into the receptor chamber. On the other hand, AVO remained in the donor chamber or accumulated in the membrane. The results of this study revealed that liposomes are a promising delivery system for coencapsulated AR and AVO. Liposomes may aid in retaining the sunscreen (AVO) at the surface of the skin for sun protection meanwhile facilitating the penetration of the whitening agent (AR) into the deeper layers of the skin for whitening effect.


Assuntos
Arbutina/química , Cosméticos , Lipossomos/química , Propiofenonas/química , Protetores Solares/química , Administração Tópica , Química Farmacêutica , Portadores de Fármacos , Humanos
20.
Int J Pharm ; 645: 123384, 2023 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-37678472

RESUMO

The current work aims to design and provide a preliminary IND-enabling study of selective BMX inhibitors for cancer therapeutics development. BMX is an emerging target, more notably in oncological and immunological diseases. In this work, we have employed a predictive AI-based platform to design the selective inhibitors considering the novelty, IP prior protection, and drug-likeness properties. Furthermore, selected top candidates from the initial iteration of the design were synthesized and chemically characterized utilizing 1H NMR and LC-MS. Employing a panel of biochemical (enzymatic) and cancer cell lines, the selected molecules were tested against these assays. In addition, we used artificial intelligence to predict and evaluate several critical IND-focused physicochemical and pharmacokinetics values of the selected molecules. A secondary objective of the current work was also to validate the sole role of BMX in animal models known to be mediated by BMX. More than 50 molecules were designed in the present study employing five novel discovered scaffolds. Two molecules were nominated for further IND-focused studies. Compound II showed promising in-vitro activity against BMX in both enzymatic assays compared to other kinases and in cancer cell lines with known BMX overexpression. Interestingly, compound II showed very favorable physicochemical and pharmacokinetics properties as predicted by the used platforms. The animal study further confirmed the sole role of BMX in the disease model. The current work provides promising data on a selective BMX inhibitor as a potential lead for therapeutics development, and the asset is currently in the optimization stage. Notably, the current study shows a framework for a combined approach employing both AI and experimentation that can be used by academic labs in their research programs to more streamline programs into IND-focused to be bridged easily for further clinical development with industrial partners.

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