ABSTRACT
Dithranol belongs to the keratolytic category, which is widely used drug in the treatment of psoriasis. The drug is practically insoluble in water. Many conventional dosage forms for psoriasis treatment have been have been formulated earlier, but they did not show good results. Hence in the present study, it was attempted to formulate dithranol in the form of solid lipid nanoparticle. Solid lipid nanoparticles of dithranol were obtained by adaption of lipid dispersion method. Preformulation studies were performed to check the compatibility of drug and excepient for the preparation of formulation by DSC and no interaction was found. Solubility study, partition coefficient determination, UV analysis, HPLC study, FTIR study were also performed. After the preformulation studies Dithranol loaded solid lipid nanoparticles was also prepared. Hence it was concluded that solid lipid nanoparticle of dithranol could be formulated.
ABSTRACT
Gymnema sylvestre extract (GSE) is a plant product widely used as an adjuvant in the treatment of diabetes mellitus and commercially available as a powder. Owing to its low flowability, the manufacturing of hard gelatin capsules containing GSE faces specific problems. The purpose of this study was to investigate the best excipient (starch, lactose or microcrystalline cellulose) for hard gelatin capsules containing GSE. The technological properties such us bulk density (ñâ); tapped density (ñt); inter-particle porosity (Ie); Carr index (CI); Hausner ratio (HR); loss on drying (%LOD) and particle size distribution (%Pf) of the various GSE mixtures were investigated with the aim of identifying the best excipient. The need for lubricants (talc/magnesium stearate) was also assessed. GSE was characterized as a fine powder with more than 50% of its particles between 0.149mm to 0.250mm; furthermore, CI=25.6%; RH=1.3 and Ie = 25.6% and, as expected with such properties, it showed poor flowability. All the excipients investigated were able to change the technological properties of GSE and the powder mixture containing microcrystalline cellulose gave the best results.
O extrato seco de Gymnema sylvestre (EGS) é um produto fitoterápico amplamente utilizado como adjuvante no tratamento da diabetes, sendo comercializado na forma de pó. O objetivo do presente estudo foi investigar a influência da adição de adjuvantes (amido, lactose ou celulose microcristalina) à formulação para a preparação de cápsulas gelatinosas duras contendo o EGS. As propriedades tecnológicas como densidade aparente (Da), densidade aparente de compactação (Dc), porosidade interparticulas (Ie), Índice de Carr (IC), Fator de Hausner (FH), perda por dessecação (PD%) e análise do tamanho de partículas (%Pf) das diferentes misturas preparadas foram investigadas com o objetivo de escolher o melhor excipiente. A necessidade de agentes lubrificantes (talco/estearato de magnésio) também foi avaliada. O EGS foi caracterizado como um pó fino, com mais de 50% do material particulado compreendido entre 0,149-0,250mm; IC=25,6%; FH=1,3 and Ie = 25,6%, o que justifica seu fluxo pobre. Todos os excipientes testados foram capazes de modificar as propriedades tecnológicas do EGS, sendo a mistura de pós que apresentou melhores resultados aquela obtida com a adição de celulose microcristalina.