Molecular Weight Effect of Different Grades of HPC Polymer

Molecular Weight Effect of Different Grades of HPC PolymerIntroductionBioavailability kick upstairsmentWet media milling + crop-dusting dryingIssues have impact on waste performanceNovelty of the workObjectiveMaterial and methods absurd stirred media millingSpray dryerCharacterization techniquesResults and discussionPhysical stability of the milled precursor gaolbreaksdo medicines gaolbreak kineticsFormation of the NCMPs via sprayer drying of the precursor do medicines suspensionsImpact of varied polymers on the medicine looseness from NCMPsPVP-K30HPMC-E3HPC-SSL, HPC-SL, HPC-LMolecular tipiness effect of different grades of HPC polymer on drug dissolution performance and stabilityIt is estimated that a large percentage of newly developed drug compounds have bound bioavailibity due to their poor water solubility and very slow dissolution say 1. According to the Biopharmaceutics Classification System (BCS), class II drugs are categorize as sickly water dissolvabl e and highly permeable in human body 2. To achieve the therapeutic efficacy of these drugs it is very essential to enhance the bioavailability by increasing the solubility or dissolution rate. A number of approaches have been developed over the time to resolve this issue. The reduction of drug particles size to sub-micron or nanometer has been one of the most popular and hard-hitting approaches of all 3-6. By reducing the particles size order of magnitude, specific surface area of the particles change magnitude radically and enhances the rate of absorption and dissolution 7, 8, concord to the Noyes-Whitney equation 9. medicate nanoparticles production technologies are classified into Bottom-up or Top-down or conclave of both. The bottom up techniques include precipitation using supercritical fluid, liquid anti-solvent precipitation, and evaporative precipitation, where small drug particles are take a leakd from drug molecules dissolve in complete solvent 10, 11. In case of to p-down approaches, the particles are reduced to the nanometer range 11. High pressure homogenization 5 and wet media milling 3 are include in top-down approaches. To prepare drug nanosuspension, wet stirred media milling (WSMM) has achieved the most popularity because of its effectiveness, robustness, scalability, high drug loading, and low polymer side effects 5, 12, 13. collect to galore(post token(a)) advantages of drug solid dosage form, it is the most popular dosage form to the patients/clinicians. To encounter this high demand, drug nanosuspensions are usually converted into nanocomposite microparticles (NCMPs) using different drying techniques and incorporated into standard solid dosage forms such as tablets and capsules 13, 14. Vacuum dryer 15, 16, spray-freeze dryer 17, 18, spray dryer 19, 20, and fluidized bed 17 are very predominate and widely used drying tools in the pharmaceutical industries. Among all the drying techniques, spray drying has already got attention due to its heftiness intensive, continuous and scalable drying process characteristics and ability to produce micro to nano-sized particles with a very narrow distribution within a very short time frame 21.Albeit particle size reduction is an effective technique for bioavailability enhancement, stability issue has always been critical for the efficacy of the drug products. In the nanosuspension, drug particles start losing their specific surface area by accruement due to relatively high surface energy and specific surface area and also for enhanced Brownian motion 22. For the prevention of aggregation in the wet media and having better stability, polymers and/or surfactants are added to the suspension as stabilizers. These stabilizers provide stability by electrostatic or electrosteric mechanisms 22. Steric stability provided by the polymer is drug specific. Only hardly a(prenominal) polymers can help to reduce the particle size of a specific drug down to nanometers. Therefore, select ing a proper stabilizer for a specific drug is a very complex process and cannot be generalized easily 23. Thus, having a better keenness ab come on the polymer properties is very crucial to figure out the right stabilizer for a particular drug. Molecular weight of the polymer is a very significant property of polymers, which determines the capability for steric stabilization along with solution properties 24, 25, regulates mechanic property of the films 26, and controls the drug discharge during oral administration 27. Consequently, optimum MW and polymer concentration may help to get the best stabilization performance during and subsequently milling, and smart drug release from the composites. Choi et al. 16 investigated the impact of lower range MW (11,200-49,000 g/mol) of hydroxypropyl cellulose (HW) on itraconazole suspension production and their recovery from the drug composites. In that work, HPC was used altogether with the same concentration, and dissolution performan ce study was absent. Sepassi et al. 28 studied MW effect of two different polymers hydroxypropylmethyl cellulose (HPMC) and polyvinylpyrrolidone (PVP) on the particle size reduction of milled nabumetone and halofantrine suspensions however, drying and dissolution rate were not studied. Li et al. 29 studied the MW and concentration effect of hydroxypropyl cellulose (HPC) on the dissolution performance of poorly soluble drug griseofulvin (GF) in front line/absence of sodium dodecyl sulfate (SDS) as surfactant. In that investigation, drug nanosuspension was coated and dried on to the surface of pharmatose using fluidized bed technique and also inflexible the optimum concentration and MW effect of HPC for complete release of the drug particles during dissolution.To authors best knowledge, no comprehensive and systematic study has been performed so far to get the insight about the head to head comparison of different polymers performance and MW effect of the same polymer on the suspens ion stability after milling and during dissolution of NCMPs produced via spray drying. It is known from former study that the combined use of polymers and surfactants provide a synergistic effect leading to better stability in the nanosuspension than individual stabilizers 30, 31. Due to the side effects of surfactant, it is always expected to use minimal amount in the formulation. If only the use of polymer can provide substantial stability in the nanosuspension and immediate release of the drugs in the dissolution from NCMPs, then it is more viable than using surfactant. Therefore, this study aims to develop an understanding of the polymer MW and different polymer effect on the personal stability of Itraconazole nanosuspension and drug dissolution from the composites. Itraconazole (ITZ) suspensions were milled in a WSMM and the nanocomposite particles were produced using a co-current spray dryer. Three different polymers HPC, PVP, and HPMC were used at 4.5% (w/w) concentration t o see the polymer effect and for MW effect, three grades (SSL, SL, and L) of HPC having different MW were used. Laser diffraction, SEM, UV- spectroscopy, XRPD, and DSC were used to analyze the drug suspension and composite particles. Dissolution test of the NCMPs were performed by a USP II paddle apparatus.MaterialsItraconazole (ITZ), is an antifungal drug with a water solubility 0.13 mg/L (at pH-7 and 25 C), is a sparingly water soluble drug belong to the BCS Class II was purchased from Jai Radhe Sales (Ahmedabad, India) and was used as-received condition. Three different polymers, hydroxypropyl cellulose (HPC), hydroxypropylmethyl cellulose (HPMC), and polyvinylpyrrolidone (PVP) were used as polymers. Three grades (SSL, SL, and L) of HPC with 40, 100, and 140 kDa molecular weight, abide byively, were donated by Nisso the States Inc. (New York, NY, USA) and used for steric stabilization. Polymeric stabilizers Methocel E3 grade HPMC and PVP Kollidon 30 were donated by Dow Chemical (Midland, MI, USA) and BASF Corporation (Florham Park, NJ, USA) respectively. Sodium dodecyl sulfate (SDS) is an non-ionic detergent surfactant used as a leak agent during dissolution and provide electrostatic stabilization in the suspension, was purchased from Sigma Aldrich (Milwaukee, WI, USA). Zirmil Y grade wear-resistant yttrium-stabilized zirconia (YSZ) with a median size of 430 m (400 m nominal size) was used as the milling media and purchased from Saint Gobain ZirPro (Mountainside, NJ, USA).MethodsWet Stirred Media Milling (WSMM)The presuspension (before milling) was prepared following the same procedure used in Afolabi et al. 32. in all the suspension formulations are tabulated below in Table 1. API (Itraconazole) concentration was kept constant at 10% (w/w) and polymer concentration was 4.5% (w/w) for all the formulation. All the concentrations are reported with respect to deionized water (200g). The formulation with 2.5% (w/w) HPC-SL and 0.2% (w/w) SDS was used as a ba seline formulation, because from earlier study it was found to be the optimum for fastest and complete drug release from the composite mills.Prepared drug suspension was milled in a Netzsch wet media mill (Micorcer, Fine Particle Technology LLC, Exton, PA, USA) with 80 ml house 50 ml of the domiciliate was filled with 400 m (nominal size) Zirconia beads, which is the milling media and a screen with 200 m opening was used to confuse the beads into the chamber and allowing only the passage of the suspension. A soak mixer (Fisher Scientific Laboratory Stirrer, Catalog No. 14-503, Pittsburgh, PA) was used to prepare the suspension prior to transfer into the property tank of the miller. The suspension was pumped through a peristaltic pump and was milled under the following conditions suspension flow rate 126 ml/min, rotor speed 4000 rpm corresponding to a tip speed of 11.7 m/s. To keep the suspension temperature below 35 C, milling chamber and holding tank both were equipped with a chiller (Advantage Engineering Greenwood, IN, USA). All the parameters were selected from the earlier work done by Afolabi et al. 31. To determine the breakage kinetics, particle sizes were calculated at different time intervals up to 65 minutes and the suspension were refrigerated at 8 C for one day before spray drying.Preparation of NCMPs via Spray DryingThe prepared nanosuspesions were dried within a day of milling using a spray dryer (4M8-Trix, Procept, Zelzate, Belgium) running in a co-current flow set up. All the operating conditions were interpreted from Azad et al. 19.The suspensions were atomized at 2 bar atomizing pressure using a bi-fluid nozzle having 0.6 mm tip diameter. In each run, 120 gm nanosuspensions were sprayed at 1.3-1.6 g/min spray rate using a peristaltic pump (Makeit-EZ, Creates, Zelzate, Belgium). Drying air was fed co-currently from the top of the newspaper column at 120 C temperature and 0.37-0.40 m3/min volumetric flow rate. To avoid sedimentation of t he drug particles during spraying, the suspension was stirred using a magnetic stirrer throughout the run. A Cyclone separator was used at 54-70 mbar differential pressure to separate the NCMPs from the outlet air stream and collecting them in a sugarcoat jar. The dried powders later on were used for powder sample characterization e.g., XRD, DSC, Rodos, and dissolution testing.Particle Size AnalysisParticle size distributions of the suspensions were measured at different time interval during milling and after 7-day storage in the refrigerator by laser diffraction (LD) technique using Coulter LS 13 320 (Beckman Coulter, Miami, FL). All the steps involved for measuring PSDs of the suspensions were followed from Li et al. 29. During sample addition, intensity was maintained between 40-45% while obscuration was below 8%. Mie scattering system was used to fancy the volume-based PSDs in the software. Refractive index value is 1.68 for ITZ and 1.33 for deionized water (medium). Before me asuring the PSDs, 2 ml suspension sample was collected from the outlet of the mill chamber and diluted with 5 ml of the respective stabilizer solution using a vortex mixer (Fisher Scientific Digital Vortex Mixer, Catalog no 0215370, Model No 945415, Pittsburgh, PA) at 1500 rpm for 1 min.The Particle size distributions (PSDs) of produced NCMPs via spray drying were measured by Rodos/Helos laser diffraction (LD) system (Sympatec, NJ, USA) based on Furnhofer theory with dry powder dispersion module. On the sample chute of the Rodos dispersing system, just about 1 g of the sample was placed. To feed the samples, the sample chute was vibrated at 50% settings and 0.1 bar dispersion pressure was imposed to suck in the falling powder through the sample cell of the laser diffraction system.Determination of Drug Content in the Composite PowdersDrug content of the composite powders were measured by assay testing. ITZ solubility is - in dichloromethane (DCM). 100 mg of the NCMPs was dissolved i n 20 ml DCM, sonicated for 30 mins to ensure all the ITZ is dissolved in the solvent and then they were allowed to sediment overnight. An aliquot of 100 l is interpreted from the supernatant and diluted to 10 ml with DCM. The absorbance of all the samples was measured at 260 nm wavelength via Ultraviolet (UV) spectrophotometer (Agilent, Santa Clara, CA, USA). Six replicates were prepared from each NCMP formulation to calculate connote drug content and percent relative standard deviation (RSD).Scanning Electron Microscopy (SEM)SEM imaging was performed to understand the morphology and particle size of the ITZ particles before and after milling. SEM images of as-received ITZ and baseline formulation was taken using a LEO 1530 SVMP (Carl Zeiss, Inc., Peabody, MA, USA) SEM machine. Approximately, 0.1 ml milled suspension sample was placed on top of a te chip (Ted Pella Inc., Redding, CA, USA), and then on top of a cytosine specimen holder. The sample was placed into a desiccator for overnight drying. The samples were then sputter coated with carbon before analyzing 33.X-ray Powder Diffraction (PXRD)The crystallinity of the as-received ITZ, animal(prenominal) mixture of ITZ-excipinets, and spray dried powders were analyzed using PXRD (PANalytical, Westborough, MA, USA), provided with Cu K radiation (= 1.5406 ). The samples were scanned at a rate 0.165 S-1 for 2 ranging from 5 to 40.Differential Scanning Calorimetry (DSC)DSC of the as-received ITZ, Physical mixture of ITZ-excipients, and spray dried powders was performed using a Mettler-Toledo polymer analyzer (PolyDSC, Columbus, OH, USA). The samples were heated at a rate of 10 C/min within a range of 25-220 C under nitrogen gas flow. With the help of the integrated software of the machine, break up temperature Tm and fusion enthalpy Hm were determined.Dissolution TestingDissolution of ITZ from the as-received drug, and spray dried composite powders were determined via a Distek 2100C dissolution tester (North Brunswick, NJ, USA) according to the USP II paddle method. The dissolution medium was gigabyte ml SDS buffer with 3.0 gm/ml concentration at non-sink condition. The medium was maintained at 37 C temperature and 50 rpm paddle speed. The composites were weighed equivalent to a dose of 20 mg of ITZ. Composites were poured into the dissolution medium and manually 4 ml of samples were taken out at 1, 2, 5, 10, 20, 30, and 60 min. Aliquots of the samples were filtered using a 0.1 m PVDF membrane type syringe filter to avoid any effect of undissolved drug during UV spectroscopy measurement. The absorbance of ITZ dissolved was measured via UV spectroscopy (Agilent, Santa Clara, CA, USA) at 260 nm wavelength. The blank was measured using SDS buffer at the beginning. The amount of drug dissolved was measured using a calibration curve generated from drug concentration vs. absorbance (R2=0.9995 with pApparent Shear Viscosity of Milled ITZ SuspensionsThe apparent dress viscosity of the nanosus pension was measured by following the procedure from Afolabi et al. 32, using R/S plus rheometer (Brookfield Engineering, Middleboro, MS, USA). To impart controlled shear rate on the samples from 0 to 1000 1/s in 60 s, a coxial cylinder (CC40) was used. To control the temperature the jacket temperature was kept constant at 250.5 C.Drug nanoparticles formation and physical stability of the milled suspensionsThe formulation of the milled drug (ITZ) suspensions are presented in Table 1. Drug (ITZ) nano suspension was first produced in presence of both steric and an anionic surfactant, SDS (Run 1). Due to the synergistic effect of HPC and SDS 31, Run 1 was used as a baseline to assess the impact of various stabilizers (HPC, HPMC E3, PVP k30, and SDS) in their breakage kinetics and physical stability of the resulting suspensions. This baseline formulation was found to be the optimum formulation from a previous work performed by Meng et al 29. The molecular weight effect of HPC was then s tudied in absence of SDS surfactant (Run 2-4) using three different grades of HPC SSL, SL, and L grades having molecular weight 40, 100, and 140 kDa, respectively.The apparent shear viscosity of all the formulations (Run 1-7) are represented in Figure 1. 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