Disintegration Time Research Articles

Role of cyclodextrin inclusion complexes assembled in the fast-dissolving structures of electrospun gelatin mats to extend the release of menthol

In this study, inclusion complexes (ICs) of menthol with various cyclodextrins (CDs) [α-CD, β-CD, γ-CD, (2-hydroxypropyl)-β-cyclodextrin (HP-β-CD), and methyl-β-cyclodextrin (M-β-CD)] were prepared, and the ICs with the highest encapsulation efficiency were applied in the electrospun gelatin mats to extend the release of menthol. Electrospinning feed solutions were evaluated based on surface tension, zeta potential, electrical conductivity, and rheological properties. The diameter and morphology of the pure gelatin and the CDs-loaded gelatin mats were analyzed using microscopy (FESEM and AFM). The results confirmed that CD loading leads to a decrease in the diameter of the nanofibers. The longest disintegration time belonged to the gelatin mat containing the β-CD complex. Comparison of the FTIR spectrum and XRD patterns of gelatin mats containing menthol-loaded CD complexes with the pure compounds confirmed the successful encapsulation of menthol inside the cavity of the CD, and the disappearance of the crystalline state of electrospun gelatin mats. Applying the electrospun gelatin mats as a fast-dissolving structure for the menthol-loaded inclusion complexes increased its thermal stability. In the bioadhesive test, the lowest force required to separate the gelatin mat from the skin model was obtained in the menthol-containing β-CD gelatin mat (6.21 ± 1.01 g). The menthol release from the pure gelatin mats was much faster than the electrospun mats containing CD complexes. Peppas-Sahlin and Fickian diffusion (Case-I) were the best-fitted model and menthol release mechanism, respectively.

The Formulation And Evaluation Of Metamizole Na Tablet With Porang Tubers(Amorphophallus Oncophyllus) Flour As A Binder

Many farmers are interested in planting porang tubers, and with many farmers planting porang tubers, the price of porang tubers has decreased at harvest time. Porang tubers contain several ingredients: starch, Glucomannan, fibre, fat, protein, minerals and vitamins. Glucomannan content can be used as a tablet binder, thickener, gelling agent, film former, coating material emulsifier, and stabilizer. This study used the wet granulation method to determine the concentration of porang tuber flour as a binder in Metamizole Na tablets. Tablets were made into three formulations with varying concentrations of porang tuber flour, namely FI 5%, FII 7.5% and FIII 10%. Tablets were tested for tablet uniformity, hardness, friability, disintegration time, and dissolution. The data obtained were analyzed using Kruskal Wallis. The analysis showed that variations in the concentration of porang tuber flour had a different effect, based on the Kruskal Wallis analysis, which showed a significant value of 0.10 (p>0.05). The formulation with a good physical quality test is formulation III, with a tablet hardness value of 6.84 kg and a disintegration time of 5.74 minutes, almost close to the control (+) 14.27 kg and 6.38 minutes. The higher the concentration of porang tuber flour, the higher the tablet hardness and the longer the disintegration and dissolution time.

Formulation, Evaluation & Comparative Study of Effects of Super Disintegrants in Herbal Fast Dissolving Tablet of Nyctanthes Arbor Tristis.

The purpose of this research work was to formulate & evaluate the herbal fast dissolving tablet of Nyctanthes Arbor Tristis. Taxonomically, the plant was authenticated by the Padmashri vikhe patil college of Arts, Science, & Commerce in pravaranagar. Ref.No./PVPC/Bot./2023-24/235. The aimed is to treat inflammation associated with Sciatica. A two independent variables of superdisintegrants are used such as crosspovidone & croscarmellose sodium. Using DOE software, 32 full factorial design was used to examine the combined impact of two formulation variables. TLC was performed to identify the beta sitosterol with RF value of 0.77. to determine the physicochemical interaction between the drug & the excipients, FTIR study was done. FTIR study revealed that there is no interaction of the drug and excipient. In this investigation, the tablets were formulated and assessed via direct compression. The powder mixture were compressed into tablet using single punch tablet machine. All the formulations were evaluated for their characteristic such as weight variation, hardness, thickness, friability, disintegration time(DT), and dissolution rate. It was determined from all evaluation parameter that the F9 batch was the optimized batch. It was found that an optimized batch (F9) has good cumulative drug release in 20 minutes (88.87%), DT of 56 seconds, and hardness of 2.923kg/cm2. The comparative studies are done with the marketed formulation. With the commercial formulation, the optimized batchF9 satisfies all standard specification.

Biosurfactant induced microwave disintegration of macroalgae for fermentative biohydrogen production

Biosurfactant-induced microwave disintegration (BSMD), an energy and cost effective pretreatment method, has been proposed to increase biohydrogen production from marine macroalgae (Chaetomorpha antennina). Microwave disintegration (MD) was performed for microwave powers from 90 to 540 Watts in varied periods from 0 to 60 mins. During this MD process, a disintegration time of 25 mins and microwave power of 360 W were obtained as optimum conditions, resulting in the dissolvable organics release (DOR) of 1860 mg/L and a disintegration efficiency (DE) of 14.3%. BSMD was implemented by adding the biosurfactant dosages from 0.005 to 0.05 g/g TS with the optimum power of MD at various intervals of time of 0–30 min. The optimum biosurfactant dosage for efficient disintegration in BSMD was 0.03 g/g TS, resulting in 19.55% DE and 2542 mg/L of DOR in 10 mins. BSMD sample showed increased volatile fatty acid (VFA) production of about 1393 mg/L than MD (1000 mg/L). In addition, BSMD consumed less input energy (IE) of (480 kWh / kg of solids) than MD (1200kWh / kg of solids). The highest amount of biohydrogen was produced by BSMD (120 mL H2/g COD) than MD (78 mL H2/g COD). The results showed BSMD method was energy-efficient for producing biohydrogen with an energy ratio of 1.96, and economical with a net profit of 74.78 $.

Formulation of mouth-dissolving tablets containing a spray-dried solid dispersion of poorly water-soluble fenoprofen calcium dihydrate and its characterization

The aim and objective of this investigation focus on the formulation of mouth-dissolving tablets of Fenoprofen calcium dihydrate spray dried solid dispersions. Materials and methods. Spray drying is a well-recognized manufacturing technique that can be used to create amorphous solid dispersions, which are an effective delivery method for poorly water-soluble pharmaceuticals such as Fenoprofen calcium dihydrate (FCD). In addition to skimmed milk powder (SMP) and FCD, the carrier β-cyclodextrin was used to produce solid dispersions. Results and discussion. The production of solid dispersions yielded reproducible results. Solid dispersion with β-cyclodextrin and skimmed milk powder is one way to increase disintegration time by increasing the water solubility of inadequately water-soluble FCD. In-vitro dissolution experiments of FCD mouth-dissolving tablets revealed significant differences. Stability studies should evaluate drug product characteristics that are susceptible to change during storage and are anticipated to impact quality, safety, and efficacy to demonstrate that the optimal formulations remain stable over the course of the study. The results of stability experiments were statistically significant at p<0.05 using one-way ANOVA followed by Dunnet's test. During in-vivo anti-inflammatory experiments, the formulation SDC6 demonstrated a greater percentage of inhibition than the purified drug and super disintegrant, and the results were statistically significant using one-way ANOVA followed by the Bonferroni test. Conclusions. The solid dispersions were prepared with β-cyclodextrin, and skimmed milk powder improved the solubility of the poorly water-soluble fenoprofen calcium dihydrate. In vitro dissolution experiments of fenoprofen calcium dihydrate mouth dissolving tablets and controlled tablets revealed significant differences

A comparison between solvent casting and electrospinning methods for the fabrication of HPMC fast-dissolving films: investigation of the physicochemical, mechanical and drug release characteristics

The fast-dissolving film is an innovative dosage form that rapidly delivers the loaded drug upon contact with saliva. Many studies have been conducted on the fabrication of fast-dissolving films using hydroxy propyl methyl cellulose (HPMC) as a common film-forming agent with solvent-casting method or sometimes with electrospinning. However, there is no comparison of these two methods on the physicochemical, mechanical, and drug-release behavior of HPMC films. This paper aims to compare bisoprolol-containing fast-dissolving films composed of HPMC and polyethylene glycol (PEG) as plasticizer constructed by solvent-casting and electrospinning methods. Given the formulation parameters (e.g., plasticizer and polymer concentrations) and process parameters (e.g., tip-to-needle distance, voltage, and feed rate), various solvent-casting films and nanofiber mats were prepared. Films were characterized in terms of disintegration time, folding endurance, thermal behavior (using DSC), crystallin structure (using XRD), drug content, and drug release. The size and morphology of nanofibers were also evaluated by SEM. Solvent-casting film composed of 6% w/v HPMC and 6% v/v PEG400, as well as nanofiber mat composed of 13% w/v HPMC and 3% w/v PEG2000 were successfully constructed. DSC and XRD analysis revealed that the crystalline structure of bisoprolol converted into the amorphous structure in the polymeric films. Nanofibers were smooth and free of beads with a mean size of 0.66 ± 0.19 μm. In terms of flexibility, the nanofiber mats outperformed the solvent-casting films. The disintegration time of the nanofiber mat was less than that of the solvent-casting film (3 s versus 30 s). Besides, nanofibers indicated faster release. The superior performance of nanofiber mats can be attributed to their nanostructure. The results showed that the characteristics of the fast-dissolving films fabricated of HPMC, including disintegration time, release rate, and flexibility could be improved through the electrospinning process.

Effect of Maltodextrin Concentrations and Drying Temperature on the Physico-chemical Characteristics and Color Measurements of Butterfly Pea Flowers (Clitoria ternatea L) Powder

Butterfly pea flower (Clitoria ternatea L.) is a tropical plant that is rich in bioactive compounds, especially anthocyanins which are useful as natural dyes and antioxidant compounds. The bioactive compounds of butterfly pea flowers are unstable due to environmental influences, especially temperature, oxygen, light and acidity. In order to improve the stability of bioactive compounds, especially anthocyanin compounds in powder form, it is necessary to utilize encapsulation technology using coating materials. The aim of this research was to determine the effect of maltodextrin concentration and drying temperature on the physico-chemical characteristics and color measurements of encapsulated butterfly pea flower extract. The research method used was a factorial design prepared using a randomized block design consisting of 2 factors. Factor I (maltodextrin concentration) consisted of 3 levels, namely (10%, 20%, and 30%) while factor II (drying temperature) consisted of 3 levels (70ºC, 80ºC, and 90ºC), with 3 repetitions. The observation variables are: a) antioxidant activity, b) anthocyanin content, c) water content, d) dissolution time, e) color properties (L*, a*, and b*). Based on general research results, a maltodextrin concentration of 10% and a drying temperature of 70ºC showed the best results based on antioxidant activity rate and the highest anthocyanin content (51.47% and 47.36mg/g), as well as color measurements with the lowest L* value = 52, highest a* value = +2.6, and highest b* = -11.16. Except for powder solubility, a maltodextrin concentration of 30% and a drying temperature of 90ºC resulted in the fastest solubility time (16.67 seconds). For water content, all treatments were still in accordance with spice standards in Indonesia and standards issued by the USDA.

Investigating Bioactive-Glass-Infused Gels for Enamel Remineralization: An In Vitro Study.

Dental hypersensitivity remains widespread, underscoring the need for materials that can effectively seal dental tubules. This study evaluated the potential of bioactive-glass-infused hydroxyethyl cellulose gels in this context. Five gels were synthesized, each containing 20% bioactive glass (specifically, 45S5, S53P4, Biomin F, and Biomin C), with an additional blank gel serving as a control. Subjected to two months of accelerated aging at 37 ± 2 °C, these gels were assessed for key properties: viscosity, water disintegration time, pH level, consistency, adhesion to glass, and element release capability. Across the board, the gels facilitated the release of calcium, phosphate, and silicon ions, raising the pH from 9.00 ± 0.10 to 9.7 ± 0.0-a range conducive to remineralization. Dissolution in water occurred within 30-50 min post-application. Viscosity readings showed variability, with 45S5 reaching 6337 ± 24 mPa/s and Biomin F at 3269 ± 18 mPa/s after two months. Initial adhesion for the blank gel was measured at 0.27 ± 0.04 Pa, increasing to 0.73 ± 0.06 Pa for the others over time. Gels can release elements upon contact with water (Ca- Biomin C 104.8 ± 15.7 mg/L; Na- Biomin F 76.30 ± 11.44 mg/L; P- Biomin C 2.623 ± 0.393 mg/L; Si- 45S5-45.15 ± 6.77mg/L, F- Biomin F- 3.256 ± 0.651mg/L; Cl- Biomin C 135.5 ± 20.3 mg/L after 45 min). These findings highlight the gels' capacity to kickstart the remineralization process by delivering critical ions needed for enamel layer reconstruction. Further exploration in more dynamic, real-world conditions is recommended to fully ascertain their practical utility.

Simulated acetaminophen plasma profiles from fixed-dose combination formulations: studies using the flow-through cell dissolution method

The aim of this work was to simulate acetaminophen plasma profiles from two fixed-dose combination formulations (acetylsalicylic acid, acetaminophen, and caffeine of generic vs. reference formulation) and in vitro dissolution data generated by the flow-through cell apparatus (laminar flow of 16 ml/min, 22.6 mm cells and 0.1 M phosphate buffer pH 7.4). Results were compared with in vitro release information of USP apparatus type II (paddle at 100 rpm and 900 ml of same dissolution medium). Dissolved drugs until 60 min were determined with a ratio-derivative spectrophotometric method. To compare dissolution profiles of each drug, dissolution efficiency and mean dissolution time were calculated. To predict in vivo behavior a convolution approach as well as acetaminophen published information were used. Peak plasma concentrations and area under the curve (zero time to infinity) were considered and values of predicted error for these pharmacokinetic parameters were established. When comparing dissolution profiles with Student’s t-tests significant differences were found (p < 0.05). All values of predicted error showed satisfactory results since only data generated by the flow-through cell dissolution method achieved < 10% for each pharmacokinetic parameter. It is important to carried out in vivo studies with used formulations to corroborate the obtained results.

Development and evaluation of therapeutically useful oral solid tablets containing natural extracts: a quality by design approach

The quality target product profile was created for therapeutically useful oral solid tablets containing natural extracts. Important quality criteria were recognised. The risk priority no. was used to evaluate critical materials for initial risk assessment. Using Central Composite Design, the effects of critical parameters (croscarmellose sodium & PVP K-30) were investigated. The impact of the formulation variables X1: Croscarmellose sodium and X2: PVP K-30 on responses Y1: DT (Disintegration time in minutes) and Y2: Friability (%) were assessed. Factor X2: PVP K-30 was found to have a substantial impact on both the responses. The optimized formulation having Croscarmellose sodium-20mg/tab and PVP K-30 8 mg/tab meets the QTPP (quality target product profile) and essential requirements for oral solid tablets standards. Present research shows that QbD (quality by design) is an excellent method which comprehending the critical parameters for optimising therapeutically useful oral solid tablets containing natural extracts.

Formulation, Optimization and Evaluation of Ticagrelor Liquisolid Tablets for Enhanced Solubility

Purpose The study aims to use liquisolid compacts technology as a novel carrier to enhance Ticagrelor's solubility and release profile. Method: Formulation of liquisolid tablets was developed using the Design of Experiment (DOE) approach where the drug Ticagrelor was dispersed in PEG-600 and incorporated into carrier material (Neusilin US2) in the mortar, the liquid drug was permitted to absorb in the second stage. Aerosil-200 was used as a coating material, and Magnesium stearate and Sodium starch Glycolate were used as Lubricant and Disintegrating Agent respectively. The formulations were optimized and the carrier-to-coating ratio and mixing Aerosil-200 with Neusilin US2 effect on drug release from the formulation was investigated. The prepared liquisolid compacts were subjected to micrometric characterization, post-compression parameters, Fourier Transform Infrared Spectroscopy (FTIR), and Differential Scanning Calorimetry (DSC). Result: The cumulative drug release of all formulations in dissolution media varies from 82% to 96% and Formulation F9 showed a maximum cumulative drug release of about 96%. The drug contents of all formulations ranged from 91.06% to 99.01%. Disintegration time for all 1-9 formulations, clearly, all compositions disintegrate in less than 10 minutes. The cumulative drug release of all formulations varies from 82% to 96% Formulation F9 showed a maximum cumulative drug release of about 96% and the conventional tablet showed a cumulative drug release of about 80 %. The optimized liquisolid formulation F8 outperformed the other batches in terms of flow and compressibility across all formulations. Conclusion: Therefore, as per the results, it can be inferred that Ticagrelor, when formulated by a liquisolid approach, produce ameliorated dissolution and stability profile.

Investigating the Acid Erosion Characteristics of Carbonate Rocks under Hydrodynamic Action.

In carbonate areas, the unique dissolution features bring a lot of resistance to engineering constructions. The acidic filtrate will definitely cause accelerated dissolution of the surrounding rocks, and the mechanism of accelerated dissolution of such rocks in acid is not clear. In order to explore the dissolution pattern of carbonate rocks after the alteration of their primary environments, a self-made rotating reaction device was used to conduct laboratory dissolution experiments on carbonate cores under three conditions. The mass loss, the change of pH, the molar concentration of Ca2+ and Mg2+, and the morphological changes before and after acid erosion were obtained. The results of correlation analysis show that the dissolution characteristics of carbonate are significantly related to dissolution time, composition of rocks, liquid flow rate, and acid concentration. Segmented characteristics were recorded between CaO/MgO and the reaction sequence (m). When 2 < CaO/MgO < 30, the increase of CaO/MgO has a significant contribution to the chemical dissolution rate; however, when 30 < CaO/MgO < 66, the increase of CaO/MgO does not contribute significantly to the chemical dissolution rate. The dissolution rate is positively correlated with the liquid flow rate. Also, liquid flow rate changes affect dolomite more than they do limestone. The mass loss rate (Rc) order of the rocks of the five carbonate formations was Maocaopu > Qingyan > Falang > Anshun > Dengying. Differences in dissolution induced by the acidic fluids in different formations will eventually form complex dissolution channels.

Formulation of Effervescent Tablet from Kelulut Bee (Trigona sp.) Pollen from East Kalimantan

Since the beginning of human history, bee honey has been used by humans. However, there are also other bee products such as bee pollen (BP), royal jelly, propolis, and beeswax. Previous research has identified that pollen contains amino acids, lipids, flavonoids, micronutrients and many fat-soluble vitamins such as vitamins A, E and D, as well as water-soluble vitamins such as vitamins B1, B2, B6 and C. The objective of this study is to formulate bee pollen as effervescent tablet. The method in this study used alkaline granulation which requires an oven process for 24 hours and the use of a combination of sodium bicarbonate with citric acid. Three formulas were optimized in this study. The stability test results showed that formula number 3 has an average moisture content of 0.5696±0.6154%, and average flow rate of 0.67±0.02054 g/sec, the average compressibility in formula number 1 is 0.046±0.0452%. Overall, it is also known that formula number 2 has the smallest dissolution time compared to other formulations. The effect of the combination of citric acid and sodium bicarbonate used in the formulation of effervescent tablets from bee pollen on the physical quality of the tablets, namely friability, hardness, and dissolving time, the higher levels of citric acid and sodium bicarbonate used do not have a significant effect on friability, hardness, and time dissolving effervescent tablets from bee pollen from kelulut bees (Trigona sp).

Formulation and Evaluation of Polyherbal Hematinic Capsule for Pediatrics

Hematinic deficiencies in children, including those related to iron, folic acid, and vitamin B12, are a serious health issue that impact a child's growth, development, and general wellbeing. Administration of dose, taste, and compliance are common problems with conventional therapies. To address these issues, the production and testing of polyherbal hematinic capsules intended for pediatric usage is the main focus of this work. Strong hematinic properties in plant extracts are selected with care, and the right processing methods are used for young users. The capsule size is adjusted for ease of swallowing, and the polyherbal mixture is improved to increase compliance. To ascertain the effectiveness, safety, and suitability for use in pediatric settings, testing is done. The created polyherbal hematinic capsules exhibit outstanding disintegration time, flow characteristics, and an hourly cumulative drug release of 97.7%. The results imply that hematinic polyherbal capsules have potential as a safe and efficient option for treating paediatric hematinic deficits, addressing compliance concerns and providing an appealing dose form.

Microencapsulation of ADN with HTPB‐based membrane in the presence of the bonding agents Tepan or Tepanol**

AbstractAmmonium dinitramide (ADN) has appeared as a promising oxidizer for green propellants and thereby a potential substitute for ammonium perchlorate, largely in use in composite propellants for tactical and strategic long‐range missiles. The novelty lies in replacing ammonium perchlorate with a chlorine‐free oxidizer less harmful to the health and environment. However, ADN is hygroscopic and can potentially react with other chemical components, which could be overcome by microencapsulating the particles. The simple coacervation method was tested herein to microencapsulate ADN with a membrane made of hydroxyl‐terminated polybutadiene as pre‐polymer and methylene diphenyl diisocyanate as the curing agent. The effect of polyamine bonding agents on the capsule formation was tested by adding 0.5 or 2 % of Tepan or Tepanol, whose efficacy to bond to ADN was confirmed by detecting ammonia release through infrared spectroscopy. The capsule membrane was examined by optical and scanning electron microscopy. The dissolution time and rate were the parameters adopted to quantify permeability in a straight dissolution test in water, which demonstrated that 0.5 % Tepanol can provide the most effective protection. The infrared spectroscopy indicated that 60 °C temperature for prolonged periods, normally experienced by propellants, does not chemically affect the capsules’ membrane but can turn it lumpy. In conclusion, these polyamine bonding agents can assist the capsule formation over ADN particles using the simple coacervation method, however, their functionality on mechanical properties of propellants needs to be substantiated in forthcoming works as well as the effect of the concentration of bonding agents on propellant formulations.

New Excipient For Oral Drug Delivery: CNC Derived From Sugarcane Bagasse-Derived Microcrystalline Cellulose.

Nanocrystalline cellulose (CNC) has emerged as a subject of researcher's interest because of its diverse attributes encompassing biocompatibility, sustainability, a high aspect ratio, and an abundance of -OH groups suitable for modifications. Sugarcane bagasse microcrystalline cellulose (SCBMCC) was used as the raw material for the preparation of CNC due to its pure cellulose content, which is mildly compromised by the pectin, hemicellulose, lignin, and other lignocellulosic components. In the present work, CNC was extracted from SCBMCC and used as a disintegrant. The classic hydrolysis technique was used for the preparation of CNC. Hydrolytic conditions were optimized using the response surface methodology (RSM). The optimized batch of CNC was characterized using techniques such as field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. Notably, CNC prepared under a hydrolysis time of 90 min exhibited the highest crystallinity of 69.9%. The average particle size and zeta potential were found to be 145 nm and -34.4 mV, respectively. Thermal analysis suggested that an intermediate hydrolysis time resulted in CNC with enhanced thermal stability, showcasing its potential for pharmaceutical applications. Diclofenac potassium was used as the model drug to evaluate the disintegrant properties of CNC as an excipient. Tablets were prepared using the direct compression method. SCBMCC and CNC were used as disintegrants and were compared with the commercial product. The disintegration times (DTs) attained for the tablets prepared using CNC and SCBMCC are 219 and 339.83 s, respectively. The dissolution study of CNC showed a dissolution efficacy (DE%) of 66 and a mean dissolution time (MDT) of 12. The research findings showed that tablets prepared using CNC as disintegrants exhibited the fastest disintegration compared to other formulations.

Reducing Temperature of Fused Deposition Modelling 3D Printing for Linalool Fast Dissolving Oral Films by Increasing Printer Nozzle Diameter

Oral thrush and throat infections can occur in a wide range of patients. Treatments are available; however, resistance to drugs is a major problem for treating oral and throat infections. Three-dimensional printing (3DP) of fast dissolving oral films (FDFs) of linalool oil may provide an alternative solution. Linalool oil FDFs were printed by fused deposition modelling across 1–18 % w/w linalool content range with nozzle diameters of 0.4 or 1 mm at the temperature range of 150 °C-185 °C. The FDFs were evaluated for physicochemical and mechanical properties. Increasing the printer nozzle diameter to 1 mm allowed reducing the printing temperature from 185 °C to 150 °C; consequently, more linalool was quantified in the films with improved content uniformity. The higher linalool content in the films increased the film disintegration time and mechanical strength. FDFs containing 10% w/w linalool showed clear antifungal activity against Candida albicans. Raman spectroscopy suggested linalool separation from excipients at higher temperature printing. Viscoelastic measurements indicated that to achieve printing; the elastic modulus of molten filament needed to be higher than the loss modulus at low angular frequencies. In conclusion, increasing the printing nozzle diameter may avoid loss of the active ingredient by reducing the temperature of the 3DP process.

Preparation and Investigation of a Nanosized Piroxicam Containing Orodispersible Lyophilizate.

Non-steroidal anti-inflammatory piroxicam (PRX) is a poorly water-soluble drug that provides relief in different arthritides. Reducing the particle size of PRX increases its bioavailability. For pediatric, geriatric, and dysphagic patients, oral dispersible systems ease administration. Moreover, fast disintegration followed by drug release and absorption through the oral mucosa can induce rapid systemic effects. We aimed to produce an orodispersible lyophilizate (OL) consisting of nanosized PRX. PRX was solved in ethyl acetate and then sonicated into a poloxamer-188 solution to perform spray-ultrasound-assisted solvent diffusion-based nanoprecipitation. The solid form was formulated via freeze drying in blister sockets. Mannitol and sodium alginate were applied as excipients. Dynamic light scattering (DLS) and nanoparticle tracking analysis (NTA) were used to determine the particle size. The morphology was characterized by scanning electron microscopy (SEM). To establish the crystallinity, X-ray powder diffraction (XRPD) and differential scanning calorimetry (DSC) were used. A disintegration and in vitro dissolution test were performed. DLS and NTA presented a nanosized PRX diameter. The SEM pictures showed a porous structure. PRX became amorphous according to the XRPD and DSC curves. The disintegration time was less than 1 min and the dissolution profile improved. The final product was an innovative anti-inflammatory drug delivery system.

Magma mixing between rhyolite and pseudotachylite as the origin for the Glencoe ‘flinty crush rock’

The Glencoe caldera is a well-studied example of a caldera system exposed to intermediate depths along the glacially excavated glen. We present a first quantitative assessment of clast-size population and matrix chemistry from the flinty crush rock that occurs on the main ring faults. Size–shape metrics of clasts differ from those of a ‘normal’ pseudotachylite from the Outer Hebrides. Both samples display good power-law clast-size populations, once allowance is made for dissolution of a portion of clasts into the melt that contained them, with fractal dimensions of 2.7 and 4.0 for the Outer Hebrides and Glencoe samples respectively. Mass-balance calculations of flinty crush rock matrix chemistry imply an origin by mixing between rhyolite and pseudotachylite that was derived from semipelitic host rock. This means that the flinty crush rock was transported some distance from the point of frictional heating, as previously proposed, as semipelitic rocks are not present at the surface at Stob Mhic Mhartuin but are likely to be present at depth. This transport, and mixing with rhyolite magma, would have provided the time and thermal energy for clast dissolution beyond that possible during normal pseudotachylite generation and quenching on fault wall rocks. Supplementary material: Results of simulations, major element compositions of the matrix in the flinty crush rock sample and a supplementary figure are available at https://doi.org/10.6084/m9.figshare.c.7084992

Modulation of impedance matching of hollow cubic carbon with semi-closed structure for effective microwave absorption

In this paper, a certain degree of semi-closed structure was successfully introduced in hollow cubic carbons (HCCs) by selective dissolution of phenolic resin (PR)/NaCl precursor by acetone. The impedance matching of the HCCs absorber was improved, which in turn lead to the enhancement of the electromagnetic wave absorption capacity. By controlling the selective dissolution time of acetone, HCCs with different degrees of integrity were formed, and the degree and mechanism of the influence of the semi-closed structure of HCCs on the wave absorbing properties were investigated by analyzing the microstructure and physical phase composition of HCCs. From the scanning electron microscope photographs, it can be seen that with the increase of the acetone treatment time of HCCs, the samples gradually appeared a certain degree of semi-closed structure. With the extension of the acetone treatment time to 60 min, the structure of the HCCs was seriously damaged, at which time the impedance matching of the wave-absorbing materials was seriously deteriorated, and the electromagnetic wave absorption performance was also decreased. Among them, the electromagnetic wave absorption performance of HCCs30min is the most outstanding, specifically, when the loading rate is 10 wt%, the maximum absorption peak value of HCCs30min with a thickness of 2.7 mm reaches −41.1 dB, and the corresponding absorption bandwidth is 3.8 GHz (8.9 GHz–12.7 GHz). The experiment confirms that the existence of the degree of structural integrity can affect the impedance matching and wave absorption performance of HCCs.