Release Kinetic Studies Research Articles

Ketorolac Tromethamine for Sustained Ocular Delivery; Novel In-Situ Gels Development and Evaluation

Objective: Ophthalmic ketorolac is used to treat itchy eyes caused by allergies. It also is used to treat swelling and redness (inflammation) that can occur after cataract surgery. Ketorolac is in a class of medications called nonsteroidal anti-inflammatory drugs (NSAIDs).
 Methods: Ocular bioavailability is always poor from conventional ophthalmic drops due to spillage and nasolachrymal drainage. Ocular in situ gels can increase the drug residence time thus increasing bioavailability. Polyacrylic acid (Carbopol 934) was used as the gelling agent in combination with hydroxypropylmethylcellulose (Methocel K4M) which acted as a viscosity enhancing agent. Compatibility studies of the drug excipients were carried out using differential scanning calorimetry. The prepared formulations were characterized for clarity, pH, drug content, sol-to-gel transition by scanning electron microscopy, in-vitro and in-vivo drug release, ocular irritation and stability.
 Results: FTIR spectras revealed that, there was no interaction between LEV and excipients. The formulated gels were transparent, uniform in consistency and had spreadability with a pH range of 7.1 to 7.4. Rheological studies revealed that the formulations were psuedoplastic in nature, drug content of sterile in situ gels was found to be 92-98%.Release kinetic study showed that the formulation followed first order diffusion controlled and the optimized formulations was having good antibacterial efficacy.
 Conclusion: The said promising formulation (F4) would be able to offer benefits such as increase residence time, prolonged drug release, reduction in frequency of administration and thereby definitely prove to improve the patient compliance.

Drug loading to mesoporous silica carriers by solvent evaporation: A comparative study of amorphization capacity and release kinetics

The sorption of poorly aqueous soluble active pharmaceutical ingredients (API) to mesoporous silica carriers is an increasingly common formulation strategy for dissolution rate enhancement for this challenging group of substances. However, the success of this approach for a particular API depends on an array of factors including the properties of the porous carrier, the loading method, or the attempted mass fraction of the API. At present, there is no established methodology for the rational selection of these parameters. In the present work, we report a systematic comparison of four well-characterised silica carriers and seven APIs loaded by the same solvent evaporation method. In each case, we find the maximum amorphization capacity by x-ray powder diffraction analysis and measure the in vitro drug release kinetics. For a selected case, we also demonstrate the potential for bioavailability enhancement by a permeation essay.

Design, Development and Evaluation Of Anti-Hypertensive Drug Solid Lipid Nano Particles

Recently, solid lipid Nano-particles have received much attention by the researchers owing to its biodegradability, biocompatibility and the ability to deliver a wide range of drugs. The aim of the present study was to design Diltiazem solid lipid Nano-particles and to evaluate them. Diltiazem solid lipid Nano-particles were prepared by hot homogenization technique using different lipids (Tristearin, GMS and Comprital), soy lecithin as stabilizers and tween 80, Poloxamer as surfactants. The Nano-particles were evaluated for particle size & PDI, zeta potential, entrapment efficiency and in vitro drug release. The particle size ranged from 49.7 to 523.7 nm. PDI of all formulations were good within the range of 0.189 to 0.427. The zeta potential ranged from -10.5 to -29.6 Mv, Entrapment efficiency of all formulations were observed was in the range of 78.68 to 95.23 %. The cumulative percentage release of Diltiazem from different Diltiazem Nano-particles varied from 53.36 to 88.74% depending upon the drug lipid ratio and the type of lipid used. The average percentage of drug released from different SLNs after 24 hours showed in the following order: F9 (53.35%) < F6 (56.75%) < F4 (61.74%) < F7 (63.8%) < F5(67.77%) < F8(69.04%) < F3(75.31%) < F1(79.36%) <F2 (88.74%) respectively. The release kinetic studies showed that the release was first order diffusion controlled and the n values obtained from the Korsmeyer-Peppa’s model indicated the release mechanism was Quasi-Fickian type (n-value of 0.47). Keywords: Diltiazem, solid lipid Nano-particles, FTIR, in vitro drug release.

Nano engineered biodegradable capsules for the encapsulation and kinetic release studies of ciprofloxacin hydrochloride

Polyelectrolyte based nano and micro capsules have been extensively studied as promising drug carrier in recent years. Natural degradable capsules have received great deal of attention due to their fascinating structural and morphological characteristics, biocompatibility, sustained and targeted-release capabilities. In this work, chitosan - dextran sulphate nano capsules were prepared via Layer-by-Layer (L-b-L) technique using sacrificial template for drug delivery applications. The loading and in vitro release studies were performed using ciprofloxacin hydrochloride as a model drug. The release media used in the study are plain water and Phosphate Buffered Saline (PBS). The optimum drug load was 389 ​μg, at a loading pH of 2.1 and a temperature of 25 ​°C for 50 ​min encapsulation time. The drug loaded capsules exhibited a slow and sustained release up to 24 ​h and the maximum release rate was obtained at pH 1.2 in water and pH 7.4 in PBS. Least amount of drug release occurred at pH 5.0 in both the release media. The amounts of drug release in water at pH 1.2, pH 5.0 and pH 7.4 are 309 ​μg, 163 ​μg and 251 ​μg respectively where as the corresponding values in the case of PBS (at pH 1.2, pH 5.0 and pH 7.4) are 236 ​μg, 198 ​μg and 251 ​μg respectively. Two different models namely, Ritger - Peppas and Higuchi models were chosen to study the release kinetics behaviour of ciprofloxacin hydrochloride. The prepared bio-degradable capsules had potential as drug carrier for targeting antibacterial drugs with diverse functionality.

Rethinking transdermal drug delivery using PVA-NLC based films

This work aims at designing an innovative poly(vinyl alcohol) (PVA) adhesive film containing nanostructured lipid carriers (NLC) loaded with olanzapine (OL) and simvastatin (SV), for the treatment of psychiatric disorders. Drug-in-NLC-in-PVA transdermal films were developed following a 32 full factorial planning. PVA concentration and lipid content were considered as key formulation variables. NLC formulations exhibited an average size of 177 ± 2 nm with a polydispersity index of 0.3 and a zeta potential of −20.8 ± 0.6 mV. The performance of PVA-NLC films was assessed in terms of adhesion, mechanical and transport (release and permeation) properties to obtain the best product conditions and providing a sustainable development process. Release kinetic studies showed that the PVA-NLC films enable a controlled drug release and that it depends on the concentration of PVA used. The formulation containing 12% (w/w) of PVA and 15% (w/w) of NLC provided the best permeation rate, along with adequate adhesiveness and cohesiveness, which is considered a promising therapeutic approach for further pre-clinical studies. An insight on the molecular details that govern the film construction and respective performance was provided by molecular dynamics simulations.

Characterization and release kinetics study of potato starch nanocomposite films containing mesoporous nano-silica incorporated with Thyme essential oil

This study aimed to develop potato starch nanocomposite films containing mesoporous nano-silica (SBA-15, SBA-16 and MCM-41) incorporated with Thyme essential oil (TEO). TEO-SBA-15/potato starch films, TEO-SBA-16/potato starch films and TEO-MCM-41/potato starch films were prepared based on potato starch. The physical and mechanical properties of the nanocomposite films were also investigated. The results showed that the addition of mesoporous nano-silica incorporated with TEO improved the properties of potato starch nanocomposite films. Especially, the addition of TEO-MCM-41 markedly enhanced the tensile strength (4.33 MPa), and reduced the water vapor permeability (1.80 g·m−1·h−1·KPa−1) and moisture absorption (37.67%) of potato starch nanocomposite films. The results of scanning electron microscopy (SEM) analysis showed that TEO-MCM-41 hardly agglomerated in the potato starch nanocomposite films. Additionally, Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) confirmed that strong hydrogen bonds were formed between TEO-MCM-41 and potato starch. The release kinetics of TEO proved that incorporating TEO into the pores of mesoporous nano-silica could delay its release rate, and the Peleg model (t/(Mt − M0) = K1 + K2t) was suitable for describing the release behavior. The findings of this study suggested that TEO-MCM-41/potato starch films had a good application prospect in the field of slow-releasing and antimicrobial packaging materials.

Encapsulation of folic acid (vitamin B9) into sporopollenin microcapsules: Physico-chemical characterisation, in vitro controlled release and photoprotection study

Folic acid (FA) is a crucial vitamin for all living creatures. However, it is susceptible to degradation under pH, heat, ultraviolet (UV) and day sunlight conditions, resulting in lowering its bioavailability. Therefore, a versatile protective encapsulation system for FA is highly required to overcome its inherent instability. We report the use of the robust Lycopodium clavatum sporopollenin (LCS) microcapsules, extracted from their natural micrometer-sized raw spores, for FA microencapsulation. The physico-chemical characterisation of the LCS microcapsules are comprehensively investigated before and after the microencapsulation using SEM, elemental, CLSM, FTIR, TGA/DTG and XRD analyses, revealing a successful FA encapsulation within the LCS in an amorphous form. The phenylpropanoid acids, responsible for the UV protection and the autofluorescence of the LCS, were found in the LCS as evidenced by FTIR analysis. TGA/DTG results revealed that the hemi-cellulose and cellulose are the major component of the LCS. A controlled and sustained release of FA from FA-loaded LCS were achieved where the release profile of FA-loaded LCS was found to be pH-dependent. The percentages of cumulative FA released after 10 h at 37 ± 0.5 °C were 45.5% and 76.1% in pH 1.2 and 7.4, respectively, ensuring controlled and slow release in simulated physiological conditions. The FA release kinetic studies indicated the prevalence of the Fickian diffusion mechanism in pH 1.2, while anomalous non-Fickian transport was ascribed for FA release in pH 7.4. The in vitro cytotoxicity assay revealed that the obtained formulations were biocompatible against the human skin fibroblast (HSF) cell line. The versatile LCS microcapsules exhibited intriguing photostability for FA under UV or sunlight irradiation. Concretely, the obtained FA sustained delivery and photoprotection properties of these LCS microcapsules validate their multifunctional characteristics, opening up intriguing applications in oral and topical drug delivery as well as in food industry.

Formulation development and in vitro evaluation of bilayer tablets Nicardipine

The present work aims to develop a stable and optimized bilayer dosage form containing immediate release &extended release drug Nicardapine as an extended-release dosage form. A potent calcium channel blocker with marked vasodilator action. It has antihypertensive properties and is effective in the treatment of angina and coronary spasms without showing cardio depressant effects. It has also been used in the treatment of asthma and enhances the action of specific antineoplastic agents. It has a plasma half-life of about (8.6h) and bioavailability is 15-45% orally. For the formulation of Bilayered tablets polymers such as Ethylcellulose, Sodium CMC, CCS, SSG, Magnesium stearate, Talc, PVP-K30, and MCC. Fourier transform Infrared spectroscopy confirmed the absence of any drug/ polymers/ excipients interactions. Preformulation studies were carried out to optimize the ratios required for various Ethylcellulose, Sodium CMC, CCS, SSG, MCC, and PVP-K30. Based on various evaluation parameters formulation M6 (IR) & M6F3 (SR) were selected as optimized formulation. It was observed that Formulations M6 (IR) & M6F3 (SR) gave maximum drug release within time. All formulations were subjected for drug release kinetics studies viz. Zero-order, First order, Higuchi matrix, Peppasmodel equations, and the formulations of floating sustained-release formulations followed the zero-order release with non-fickian diffusion mechanism. Thus conclusion can be made that a stable dosage form can be developed for Nicardapine as immediate release & sustained release by Bilayered tablets.

Silk fibroin hydrogel/dexamethasone sodium phosphate loaded chitosan nanoparticles as a potential drug delivery system

The application of nanoparticles-loaded hydrogel as a novel formulation has gotten much attention for a potential drug delivery method for desire drug controlling and targeting. This study prepared a sustained release formulation using dexamethasone sodium phosphate-loaded chitosan nanoparticles embedded in silk fibroin hydrogel. Dexamethasone sodium phosphate-loaded chitosan nanoparticles (DEX-CSNPs) was developed using the ionotropic-gelation technique and inserted in the silk fibroin hydrogel (SFH). Mean particle size, polydispersity index (PDI), and zeta potential of DEX-CSNPs were 488.05±38.69 nm, 0.15±0.07, 32.12±2.42 mV, respectively. The encapsulation efficiency (EE), drug loading capacity (LC), and the cumulative amount of released drug of DEX-loaded CSNPs, which detected in phosphate buffer saline (PBS) solution, were 67.6±6.7%, 15.7±5.7%, and 75.84%, respectively. The DEX-CSNPs were then mixed with silk fibroin (SF) solution and induced gelation by sonication to prepare a drug-releasing system. As a result, the scanning electron microscopy (SEM) image shows that the prepared drug delivery system had a properly interconnected porous structure. Smaller pore size, greater porosity, higher water uptake, and swelling ratio were achieved by incorporating CSNPs and DEX-loaded CSNPs. The cytotoxicity study was performed for the L929 fibroblast cell line. The drug release kinetics study was performed on a prepared drug delivery system. Finally, the release test results showed a suitable extended-release of DEX from the carrier over 16 days. Overall, the developed drug-releasing system can be a promising candidate for drug delivery applications.

Epoxy–8-HQ@PS/GO composite coatings: Size effect and the loading of fillers on the self-healing and passive protection

With a size effect of the fillers, the two-way corrosion protection mechanism is manifested in the composite coating system containing graphene oxide stabilized polystyrene containers encapsulating 8-hydroxyquinoline (8-HQ@PS/GO) corrosion inhibitor. The active protection is induced by the surface damage, in response to which self-healing is observed in the coating by the release of encapsulated corrosion inhibitor. The release kinetics study of the 8-HQ@PS/GO inhibitor showed a gradual and continuous supply at the damage site. A strong size effect of the 8-HQ@PS/GO on the passive protection and self-healing properties of the composite coating is demonstrated. Compared to neat epoxy coatings, hardness and elastic modulus values in Epoxy-8-HQ@PS/GO composite coatings increased by 35% and 54%, respectively. The compact arrangement of 8-HQ@PS/GO in the composite coating matrix also lowers the surface electrical resistivity by four orders of magnitude compared to the neat epoxy coating, facilitating electrostatic charge dispersal, i.e., a potential coating for the antistatic application.

Formulation and Evaluation of Dispersible tablets of a Model Anti-Parasitic Drug

The study was aimed to formulate and evaluate dispersible tablets of a model anti-parasitic drug (XXX) with an objective to produce fast dispersion of tablets by reducing the disintegration time using three superdisintegrants like Sodium Starch Glycolate (SSG), Crospovidone (PVP K30) and Croscarmellose sodium (CCS) and also diluents namely MCC and Lactose by changing their concentrations in each formulations. Totally six formulations (F1-F6) were prepared by direct compression method and evaluated for hardness, thickness, weight variation, friability, wetting volume, wetting time, water absorption ratio, uniformity of dispersion, in-vitro disintegration time, Drug content, in-vitro dissolution test and release kinetics study. FTIR studies was carried out to see possible drug excipients interaction. The stability studies were performed as per ICH guidelines. Among the formulations F6 formulation was found to be promising as it showed better results than other five formulations with In-vitro disintegration time, percentage drug release and dispersion time of 16 ± 0.93 seconds, 98.32±0.54% and 66±1.30 seconds respectively. Further the FTIR results revealed that there was no interactionF between drug and excipients. Stability study of formulation showed no significant changes in tablet properties and the drug follows Higuchi release kinetics with Fickian diffusion mechanism.

Mesoporous Silica Nanoparticles of Hydroxyurea: Potentially Active Therapeutic Agents

Background: Present malignant cancer medicines have the advantage of magnetic nanoparticles as delivery carriers to magnetically accumulate anticancer medication in malignant growth tissue. Aim: In the present investigation, a silica nanoparticles (MSNs) stacked with hydroxyurea were combined and was optimized for dependent and independent variables. Methods: In this study, microporous silica nanoparticles stacked with neoplastic medication were prepared through emulsification followed by the solvent evaporation method. Prepared MSNs were optimized for dependent and independent variables. Different formulations were prepared with varying ratios of polymer, lipid and surfactant which affect drug release and kinetics of drug release pattern. The obtained MSNs were identified by FTIR, SEM, drug entrapment, in-vitro drug release, drug release kinetics study, and stability testing in order to investigate the nanoparticle characteristics. Results: The percentage drug entrapment of the drug for the formulations F1, F2, F3 was found to be 27.78%, 65.52% and 48.26%. The average particle size for F2 formulation was found to be 520 nm through SEM. The cumulative drug release for the formulations F1, F2, F3 was found to be 64.17%, 71.82% and 32.68%. The formulations were found to be stable which gives controlled drug delivery for 6 hours. Conclusion: From the stability studies data it can be culminated that formulations are most stable when stored at lower temperature or in refrigerator i.e. 5˚C ± 3˚C. It can be concluded that MSN’s loaded with hydroxyurea is a promising approach towards the management of cancer due to its sustained release and less side effects.

Supercritical fluid impregnation of microcrystalline cellulose derived from the agricultural waste with ibuprofen

The present study was aimed to investigate the feasibility of loading microcrystalline cellulose derived from the agricultural waste with poorly water-soluble drug by using supercritical carbon dioxide as impregnation medium. Operating parameters of supercritical impregnation process (pressure, temperature and time) were varied to in order to maximize loading of ibuprofen used as a model drug into microcrystalline cellulose. The efficiency of ibuprofen loading using supercritical impregnation and release kinetics studies of microcrystalline cellulose in two pharmaceutical forms, powder and tablets, were investigated.The highest amount of ibuprofen was impregnated in microcrystalline cellulose powder by using supercritical impregnation at 25 MPa and 40 °C for 24 h (9.43%). Increasing pressure in the range of 10 MPa–25 MPa and time from 2 h to 24 h favours loading of ibuprofen into microcrystalline cellulose. A higher loading efficiency at the same impregnation conditions was observed for powdered microcrystalline cellulose. Temperature change in range of 40–60 °C had negligible influence on loading efficiency. FT-IR spectroscopy analysis showed no evidence of chemical modification of microcrystalline cellulose after processing. In vitro drug release study showed that impregnated powder formulations released the total amount of ibuprofen immediately, while the impregnation of microcrystalline cellulose powder in the form of tablets led to the achievement of the sustained release profile.

Experimental and molecular modelling study of beta zeolite as drug delivery system

The theoretical and experimental study of the use of beta-type zeolite as a carrier for the isoniazid drug was evaluated. For that, the study of adsorption isotherm was carried out to understand aspects of interaction and saturation of zeolite by the drug, applying the mathematical models of Langmuir and Freündlich for the interpretation of the data. A hybrid obtained by the adsorption of the drug in zeolite was characterized by several techniques. The results of adsorption and characterization were compared to the results of molecular modeling in order to understand the interactions involved and the way that the drug is disposed within the zeolitic structure. Finally, in vitro release kinetics studies were carried out in acidic dissolution medium at pH 3 and in simulated intestinal fluid without enzymes (pH 6.8) to simulate the release profiles in the gastrointestinal tract. The results showed the retention of approximately 110 mg of isoniazid per gram of zeolite, where the characterizations and molecular modeling proved that the drug is adsorbed within the zeolitic structure, mainly in the micropores. The release kinetics showed a greater resistance of the drug to be released in an acid medium than in intestinal fluid. These results open the way for further studies on the use of this zeolite as an excipient for drugs.

Tuning bio-aerogel properties for controlling theophylline delivery. Part 1: Pectin aerogels

A comprehensive study of release kinetics of a hydrophilic drug from bio-aerogels based on pectin was performed. Pectin aerogels were made by polymer dissolution, gelation (in some cases this step was omitted), solvent exchange and drying with supercritical CO2. Theophylline was loaded and its release was studied in the simulated gastric fluid during 1 h followed by the release in the simulated intestinal fluid. Pectin concentration, initial solution pH and concentration of calcium were varied to tune the properties of aerogel. The kinetics of theophylline release was monitored and correlated with aerogel density, specific surface area, and aerogel swelling and erosion. Various kinetic models were tested to identify the main physical mechanisms governing the release.

ZnO NPs incorporated gelatin grafted polyacrylamide hydrogel nanocomposite for controlled release of ciprofloxacin

Hydrogel nanocomposites are hydrogels which are equipped with nanomaterial within their polymeric framework. They exhibit superior strength and elasticity compared to conventional hydrogels. The present work focuses to develop a new gelatin based hydrogel nanocomposite by embedding zinc oxide nanoparticles (ZnO NPs) within gelatin-polyacrylamide hydrogel, for the controlled release of ciprofloxacin (CFX). The synthesized ZnO NPs, gelatin polyacrylamide hydrogel (GAm) and hydrogel nanocomposite (GAmZ) have been characterized using various techniques. The swelling and in vitro CFX release studies revealed that incorporation of ZnO NPs in the hydrogel matrix has not only improved the swelling characteristics and thermal stability of the hydrogel matrix but also exhibited more controlled and pH dependent release of CFX. The drug release kinetic study has revealed that the system exhibited zero order kinetics and followed the Super case II transport mechanism for CFX release.

Design and development of metoprolol succinate sustained release tablet using Eulophia herbacae and Remusatia vivipara tuber mucilage as novel drug release modifiers

ABSTRACT The present research was aimed to develop Metoprolol succinate sustained-release tablet by wet granulation using novel polymersEulophia herbacae and Remusatia vivipara tuber mucilage as release retardants. The formulations were prepared using a 32 full factorial design. In the current research, two factors were tested each at three levels. The concentration of Eulophia herbacea mucilage (X1) and Remusatia vivipara mucilage (X2) were selected as independent variables, and swelling index, t75 of % cumulative drug release, and drug content were selected as dependent variables. The prepared tablets were evaluated by weight variation test, hardness, friability, swelling index, drug release, and drug content. The optimized tablet was compared with reference formulation PROLOMET XL 100. The drug release kinetics study was performed by various models. It reveals that formulation follows anomalous diffusion (non-fickian) pattern and follows both diffusion-controlled and swelling controlled mechanisms of drug release.

Kinetic Release Studies of Antibiotic Patches for Local Transdermal Delivery.

This study investigates the usage of electrohydrodynamic (EHD)-3D printing for the fabrication of bacterial cellulose (BC)/polycaprolactone (PCL) patches loaded with different antibiotics (amoxicillin (AMX), ampicillin (AMP), and kanamycin (KAN)) for transdermal delivery. The composite patches demonstrated facilitated drug loading and encapsulation efficiency of drugs along with extended drug release profiles. Release curves were also subjected to model fitting, and it was found that drug release was optimally adapted to the Higuchi square root model for each drug. They performed a time-dependent and diffusion-controlled release from the patches and followed Fick’s diffusion law by the Korsmeyer–Peppas energy law equation. Moreover, produced patches demonstrated excellent antimicrobial activity against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) strains, so they could be helpful in the treatment of chronic infectious lesions during wound closures. As different tests have confirmed, various types of antibiotics could be loaded and successfully released regardless of their types from produced BC/PCL patches. This study could breathe life into the production of antibiotic patches for local transdermal applications in wound dressing studies and improve the quality of life of patients.

3D Bioprinted Scaffolds Containing Mesenchymal Stem/Stromal Lyosecretome: Next Generation Controlled Release Device for Bone Regenerative Medicine.

Three-dimensional printing of poly(ε-caprolactone) (PCL) is a consolidated scaffold manufacturing technique for bone regenerative medicine. Simultaneously, the mesenchymal stem/stromal cell (MSC) secretome is osteoinductive, promoting scaffold colonization by cells, proliferation, and differentiation. The present paper combines 3D-printed PCL scaffolds with lyosecretome, a freeze-dried formulation of MSC secretome, containing proteins and extracellular vesicles (EVs). We designed a lyosecretome 3D-printed scaffold by two loading strategies: (i) MSC secretome adsorption on 3D-printed scaffold and (ii) coprinting of PCL with an alginate-based hydrogel containing MSC secretome (at two alginate concentrations, i.e., 6% or 10% w/v). A fast release of proteins and EVs (a burst of 75% after 30 min) was observed from scaffolds obtained by absorption loading, while coprinting of PCL and hydrogel, encapsulating lyosecretome, allowed a homogeneous loading of protein and EVs and a controlled slow release. For both loading modes, protein and EV release was governed by diffusion as revealed by the kinetic release study. The secretome’s diffusion is influenced by alginate, its concentration, or its cross-linking modes with protamine due to the higher steric hindrance of the polymer chains. Moreover, it is possible to further slow down protein and EV release by changing the scaffold shape from parallelepiped to cylindrical. In conclusion, it is possible to control the release kinetics of proteins and EVs by changing the composition of the alginate hydrogel, the scaffold’s shape, and hydrogel cross-linking. Such scaffold prototypes for bone regenerative medicine are now available for further testing of safety and efficacy.

In vitro release kinetics study of Diallyl Disulphide entrapped into mesoporous silica matrix & evaluation of its antimicrobial activity

Diallyl disulphide (DADS) is one of the major constituents of garlic which has antimicrobial activity as well as many other advantages for human health. Sulphur present in DADS is main the reactive one to deal with the microbes. Mesoporous silica nanomaterial (MSNs) is evaluated as a potential drug carrier for any organic drug molecule to keep it intact for in vitro sustained release. Comparing two different body fluids, the dissolution rate of DADS is more in SBF than SGF because of its acidic nature. In two mediums the release mechanism is super case II transport as in both cases the ‘n’ value of Koresmeyer Peppas model is greater than 0.89. MIC value of DADS against Salmonella typhi is 0.941 mg/ml. Besides this microscopic analysis confirm the deformation of microbial cells. This means MSN's entrapped with DADS and subsequently released in pH 7.4 is much more concerned with the high amount of drug availability in body fluids.