Drug Dev Ind Pharm. Feb;25(2) Evaluation of Eudragit RS-PO and Ethocel matrices for the controlled release of lobenzarit disodium. PDF | Eudragit RS PO microspheres containing stavudine as a model drug were prepared by the solvent evaporation method using acetone liquid paraffin. PB was loaded in nanoparticles (NPs) of Eudragit RS PO (Eu-RS) prepared using the technique of quasi emulsion solvent diffusion. Variables of output power of.

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The percentage prediction error was calculated which helps in the validation of generated regression by using 8. Although Eudragit RSPO gspo been widely used as sustained release material; to our knowledge the property of its combination with GC and Gd has not been evaluated. Moreover, coefficient of determination indicates the proportion of variation in the data that is explained by the model. Kakde 1 and Eucragit. All other ingredients used throughout the study were of analytical grade and were used as received.

Side effects, short half lives, low bioavailability and the need for the administration two to three times a day when larger doses are required can decrease patient compliance. Modified nanoprecipitation method was used to prepare 15 formulations as per BBD. Concentration of drug released was determined using UV spectrophotometer.

Sustained release products are needed for metformin to prolong its duration of action and to rsspo patient compliances.

Evonik EUDRAGIT® RS PO Copolymer

From Figure 3 aa higher EE was attained with decrease in ratio of polymer to a drug and a maximum concentration of a surfactant at a constant sonication time. Figure 4 eufragit vitro cumulative release of metformin. Metformin hydrochloride is an orally administered biguanide, which is widely used in the management of type-II diabetes, a common disease that combines defects of both insulin secretion and insulin action [ 1 ].

Compression was carried out using 14 mm flat faced circular punches into tablets on an eight station rotary press tablet compression machine Rimek Minipress I Ahmadabad, India at a constant compression rsppo.

Time-controlled Drug release

Figure 5 in vitro cumulative release of metformin. The direction of the magnitude of significance as shown in 5 was negative for ratio of a polymer to a drug indicating an inverse eudraigt between ratio of a polymer to a drug and EE. It has also been used in the preparations of time-controlled drug delivery formulations [ 12 ]. Subscribe to our Newsletter All our latest content delivered to your inbox.


The wide applications of GC and GD propose their strong hydrophobic nature, substantial binding property, compatibility with the physiologic environment [ 17 ] and their sustaining property [ 18 ].

This could be attributed to an ionic electrostatic interaction between the drug and the polymer during formation of nanoparticles.

Eudragit RSPO | Gum Copal | Gum Damar | Matrix Tablets | Release Kinetics

The eidragit materials have been extensively used in the field of drug delivery because they are readily available, cost-effective, eco-friendly, capable of multitude of chemical modifications, potentially degradable and compatible due to their natural origin [ 16 ]. Hydrophilic eudragit when gspo with hydrophobic GC and GD FX-FXV no burst release was observed, which may be due to the tendency to mask these quaternary ammonium groups to some extent, thereby modifying release of the drug.

In order to compare the release profile of different formulas with possible difference in release mechanisms n valuesa mean dissolution time MDT [ 14 ] was calculated using Eq. Sink condition was maintained for the whole experiment. Hydrophilic drugs tend to rapidly equilibrate from the organic to the outer aqueous phase leaving very little drug in the precipitating nanoparticles [ 26 ]. The samples were prepared uedragit a double adhesive tape stuck to an aluminium stub.

The in vitro drug release profiles of the matrices are evaluated, and its release mechanism was studied. Many researchers investigated various natural, semi-synthetic and synthetic polymeric materials. The aim of the optimization was to obtain small particles size, small PDI, high EE, and high zeta potential. This rxpo further be seen from 3D surface plots in Figure 3.

Eudragit polymers are commercially available synthetic polymers used in drug delivery. The reduced model for EE is presented in where, and are ratio of a polymer to a drug, concentration of a surfactant, and sonication time, respectively, and and are interaction effects between ratio of a polymer to a drug and sonication time while eudragti quadratic effect on EE.

Related Files:  DRAVYAGUNA PDF

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Journal of Nanomaterials

Supplemental Content Full text links. Therefore, to eudfagit the oral delivery route, formulating the drug into polymeric nanoparticles is essential for improving the bioavailability.

It can be seen from the plot that an increase in ratio of a polymer and concentration of a surfactant resulted in an increased mean particle size.

The results are similar to the results published by various researchers [ 22 ] that the zeta potential decreases at high level of ratio of a polymer to a drug. This may be due to the increase erosion effect on the surface of large particle and particle agglomerates resulting in small particles [ 37 ].

D response surface plots showing the effect of a ratio of a polymer to a drug and concentration of a surfactant at constant sonication time and b ratio of a polymer to a drug and sonication time at constant concentration of a surfactant.

The fit to the Higuchi model indicates that the drug release mechanism from these matrices was controlled by the diffusion step. For such drugs it becomes essential rso include hydrophobic polymers in the matrix system [ eudrafit ]. Thus the purpose of solubility study was to identify suitable surfactant that possesses good solubilizing capacity for tenofovir to increase entrapment of the drug.

The optimized formulation was characterized for in vitro drug release and structural characterization.

The overall objective of this study was to develop an oral sustained release metformin hydrochloride tablet by using hydrophilic Eudragit RSPO alone or its combination with hydrophobic natural polymers Gum copal and gum damar as rate controlling factor. Each sample was measured in triplicate.

National Center for Biotechnology InformationU. The equation is composed of linear and interaction terms.

Matrix tablets, each containing mg metformin HCl were prepared by a conventional non-aqueous wet granulation technique.