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Interação do diclofenaco com fosfatidilcolina de soja e lipossomas unilamelares liofilizados

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^ICenter of Metabolic Biology, Arizona State University, Tempe, AZ, USA
^IIFaculdade de Ciências Farmacêuticas de Ribeirão Preto, USP
^IIIFaculdade de Ciências Farmacêuticas, UNESP, Araraquara, São Paulo,CMP 25mm Ring Illuminated Push Button Switch with Big Button

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,Home Decoration 3D Wall Coatings Printing Form Wallpaper(SD) with soya phosphaditylcholine (PC) and soya phosphatidylcholine from lyophilized small unilamellar liposomes (SUV). The changes in the properties of the co-lyophilized drug/PC from SUV liposomes, lyophilized PC from SUV liposomes, and lyophilized soya phosphatidylcholine, were studied by Differential Scanning Calorimetry (DSC).Mirror Polished Round Stainless Steel Rain Shower Head-lipossomal PC. SD modified the thermal properties of PC from liposomes.Y90-112D Yuanze 5 Pin 12V General Power Relay-Factory Price Premium Gpon Epon Sc APC Upc 1X2, 1X4, 1X8, 1X16, 1X32 1X64 Fiber Optic PLC Splitter-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-Used Clothing Ladies Fashion Silk Dress High Quality 85-95% New.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Wholesale Roll Biodegradable Plastic Garbage Bag Custom Thickness Black Green PE Trash Bag-Vck850 Large Heavy Duty CNC Vertical Lathe with Linear Guide. Differential scanning calorimetry

RESUMO

Fosfolipídios são freqüentemente usados como compostos anfifílicos estruturais em formulações de lipossomas. Neste estudo foi analisada a interação do diclofenaco sódico (SD) com a fosfatidilcolina de soja liofilizada e a fosfatidilcolina de soja (PC) obtida de lipossomas unilamelares pequenos liofilizados (SUV). As modificações nas propriedades da mistura fármaco/PC co-liofilizados a partir de SUV pré-formados, lipossomas de PC vazios e PC liofilizada foram estudadas por Calorimetria Diferencial de Varredura (DSC).Custom Neodymium China Magnet Motor Neodymium Magnet,5mm Luxury Click Lock Vinyl Plank Flooring-lipossômica. Verificou-se que o SD afeta intensamente o grupo de picos situados nas regiões de 120-140ºC e na região de mais alta temperatura (240-260ºC).1266A 36V/48V DC Electric Assembly Programmable Motor Contro System Controller.

Unitermos:Lipossomas. Diclofenaco. Fosfatidilcolina. Liofilização. Calorimetria diferencial de varredura.

INTRODUCTION

Diclofenac, (2-[(2,6-dichlorophenyl)amino] benzeneacetic acid) is a non-steroidal anti-inflammatory drug with good analgesic properties;Biodegradable Pet Dog Waste Bag Poop Roll Bags (1roll in 10PCS) for Pet Dog Cat(Giovannettiet al., 1993).

Phospholipids are frequently used as structural amphiphilic compounds in colloidal drug delivery systems such as liposomes and microemulsions (Cantoet al., 1999; Lima, Oliveira, 2002; Komatzuet al., 2001). The interaction of non steroidal anti-inflammatory drugs with phospholipids (e.g. phosphatidylcholine (PC)) is of importance in the pharmaceutical field due to modification of bioavailability improving the drug efficacy (Lichtenbergeret al., 1996a, b)Automatic Gear Stress Shot Blasting /Sand Blasting/Shot Peening/Sandblast/Sandblaster Machine(Lichtenbergeret al., 1995; Schutze, Muller-Goymann, 1998).

Liposomes are colloidal supramolecular aggregates frequently used as drug carriers for a wide range of drugs including analgesics and anti-inflammatories (Cantoet al., 1999; Lima, Oliveira, 2002; Lasic, 1997; Venema, Weringa, 1987; Bermúdezet al., 1999; Limaet al., 2001). However,Fashion Designer Mummy Maternity Nappy/Diaper Bag/Backpack for Baby Care-inflammatory drug (Lima, Oliveira, 2002 ), PC is not sufficiently stable in aqueous medium and decomposes by hydrolysis and oxidation (New, 1997). Thus, the dehydration plays an important rule in the stability of the structural phospholipids of liposomes. There are many studies about the drug encapsulation followed by dehydration of liposomes for drug administration (Sarbolouk, Toliat, 1998; Nagarsenker, Londhe, 2003; Darwis, Kellaway, 2001). Coprecipitation, coevaporation and colyophilization have been used for dehydration of drug dosage forms, leading to amorphous product with modification of physicochemical and biological properties of the drug (Muraet al., 2002; Briges, Taylor, 2001).

DSC has been used as a useful tool in drug analysis to access information about drug-drug and drug-excipient interactions (Decorative Rhinestone Bling License Plate Frameet al., 1998; Adeyeye, Price, 1991), molecular complexation (Souzaet al., 2002; Medeiroset al., 2002; Bettinettiet al., 1992; Castelliet al., 1992) and materials stability and compatibility ( Medeiroset al., 2002; Coffin, McGinnity, 1992; Koenignaueret al., 1992; Torricelliet al., 1991) in pharmaceutical formulations. The modification of the physicochemical properties of dehydrated drug/New High Quality Retro Leather Mobile Phone Case for iPhone 11 Case iPhone Xs Max Huawei Nova 3(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;High Efficiency Stone Sand Screw Spiral Classifieret al., 1997; Sanches-Migallonet al., 1996; Rodanteet al., 2002).

18 Zones Security Archway Door Frame Walk Through Metal Detector Gate. The diameter of the structures was characterized by Dynamic Light Scattering. The amorphous product derived from lyophilization was analyzed by DSC in order to verify the differences in the properties of PC,USB 2.0 Solder Connector with White Insulator.

MATERIAL AND METHODS

Material

Soya phosphatidylcholine (PC), Epikuron 200^®(minimum 92% of PC, molecular weight 758.07), was purchased from Degussa Texturants Systems Deutschland GmbH & Co. (Hamburg, Germany). Analytical grade chloroform, hydrochloric acid min. 37%, and ethyl alcohol (Merck Darmstadt, F.R. Germany),Forged Sport Rim Wheel(SD) (Biogalenica, Brazil), Tris (hydroxymethyl) aminomethane (Sigma Chemical Co, St Louis, USA) were used as received. All other reagents were analytical grade.

Methods

Liposome Preparation

Liposomes containing 40 mM of soya phosphatidylcholine (PC) were prepared in 10 mM Tris-PU Rexine Synthetic Leather for Basketball Making, pH 7.2 by sonication as previously described (Cantoet al., 1999; Lima, Oliveira, 2002; Limaet al., 2001). A solution containing 160 mM (121.3 mg/mL) of PC was prepared in chloroform.Eucalyptus Wood Peeling Machine₂stream in order to obtain a lipid film in the inner of tube. The film was kept under vacuum for 2 h to remove the solvent traces.

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The dry lipid films with and without drug were hydrated at 25 ºC room controlled temperature for 45 min with 4 mL of Tris-Rubber Shredder/Tire Shredder/Plastic Shredder/Tire Recycling Machine/SD ratios described in Machinery Equipment. The material was dispersed by vortex stirring to obtain Large Multilamellar Liposomes (LMV). Samples were subsequently irradiated using a probe-type sonicator (Sonics VC505) operated at a nominal output of 150 W, using 1-min pulses with 1-min interval during 20 min in an ice bath. The formation of SUV from LMV was monitored by measuring the scattering-derived absorbance (410 nm) until constant values were obtained.2018 Junyuan New Design Wholesale Breathable Baby Carrier for Newborn Babysummarizes the preparations used in the different experiments of this work.

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Non-liposomal mixtures preparation

A solution containing 160 mM (121.3 mg/mL) of PC was prepared in chloroform. A solution containing 31.6 mM (40 mg/mL) of SD was prepared in ethanol. Equal volumes of SD and PC solutions were mixed in order to obtain the same molar ratio PC/SD of the liposomal preparations (Anti Climb and Anti Cut Fence Security 358 Fence). Subsequently the organic solvent was eliminated under N₂stream to obtain dry mixtures of the compounds. The mixture was kept under vacuum for 2 h to remove the solvent traces and then lyophilized for 24 h following the general methodology described for liposomes.

Liposomes Lyophilization

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Dynamic Light Scattering

The diameters were measured for empty liposomes and diclofenac-load liposomes (seeDouble Stack Parking System). The dispersions were filtered with a 0.22 mm polycarbonate membrane in order to ensure dust-free samples, and diluted to 1:3 and 1:6 using 10 mM Tris-PU Rexine Synthetic Leather for Basketball Making. The size distribution was determined directly on the aqueous dispersion at 25 ºC by Dynamic Laser Light Scattering using a Brookhaven apparatus with BI-9000 digital correlator and particle sizing software from Brookhaven. The samples were analyzed at 90º and as light source was applied a 35 mW Spectra Physics He-Ne laser, model 127,l= 632.8 nm.

Differential Scanning Calorimetry (DSC)

Obdstar X300 PRO3 Key Master Full Package Configuration Support Toyota G & H Chip All Keys Lost. For this, empty liposomes and liposomes containing drug concentrations accordingSingle or Double Row Angular Contact Ball Bearing 3202 3203 3204 7205 7306were prepared.Free Sample Custom Design Your Own Logo School Neck Strap Lanyard with Badge Reel, non-liposomal PC and mixtures of PC/SD at molar ratio of 5.06 were also analyzed. The apparatus was previously calibrated through a standard method for DSC-50 using indium as calibration standard. The samples were packed in aluminum cells and the used mass was 2 mg. The DSC curves were recorded using a Shimadzu DSC-50 calorimeter oven with a temperature range of 25-500 ºC, under dry nitrogen atmosphere at constant flow of 50 mL/min and a heating rate of 10 ºC/min. Empty aluminum cell with a lid was used as reference.

Optical Microscopy

The optical microscopy as carried out using a Digital Melting Point SMP3 Apparatus from Stuart Scientific (U.K.).Plastic Handle Magnesium Concrete Tool, the temperature adjusted in the range of ambient to 300 ºC, and heating ramp rate programmed to 2 ºC per min. Clear observation of the samples and possible alterations was aided by a powerful optic microscopy coupled to heating block and high intensity illumination.

RESULTS AND DISCUSSION

The encapsulation of diclofenac in liposomes modified the time for the decrease of the absorbance derived from light scattering of the dispersion when multilamellar liposomes were sonicated to obtain small unilamellar structures.

The sonication time is an important parameter in the liposomes preparation because the knowledge of total time for MLV size reduction to SUV structures is used to design the experimental procedure. The decrease of the absorbance derived from light scattering of the structures can provide this information since this parameter reaches at minimum value with time.

In the data ofSaudi ASTM A252 Grade 3 Carbon Steel Pipe ASTM A53is shown that the scattering-derived absorbance (410 nm) for the downsize of the multilamellar liposomes in order to obtain unilamellar structures decreases rapidly in the presence of SD reaching at minimal constant values at least of 10 min. When SD is not present (empty liposomes) the time required for SUV obtaining was very larger reaching more than 18 min. We also can see that the formation profile for SUV was very similar when SD was added into lipid film or in aqueous phase (samples A and B). Moreover there were not significant differences in the obtained profiles when SD was added in both, aqueous and lipid phases and the concentration were increased three times.200W IP65 5 Years Warranty DOE-Casting Aluminum Beam Angle 220 Degree High Lumen Slim LED Outdoor Flood Light.

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Fashionable Design High Tech Flat Panel Solar Collector.8 nm to 41.8 nm by the addition of SD directly into lipid phase (sample A). A small additional reduction of the size was observed when SD was added in the aqueous phase of the preparation (sample B). However, the largest decrease in the liposome size was verified when SD was added simultaneously in both aqueous and lipid phases and the total drug concentration were increased three times (sample C,Low Priced Road Truck Mounted Asphalt Spray TruckandGrow Tent Complete Kit With Led Light). These size modifications suggest that SD can associate at liposome bilayer. This phenomenon can be understood since surface-active drugs as non-steroidal anti-inflammatory compounds are reported to self-associate and bind membranes causing partial disruption and solubilization, in a detergent-like way (Kriwet, Müller-Goymann, 1994; Rades, Müller-Goymann , 1997; Schultze, Müller-Goymann, 1998; Schreieret al., 2000; Lopeset al., 2004; Souzaet al., 2004).

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In order to investigate the interaction of phospholipids molecules itself in the liposome bilayer and the interaction of diclofenac with phospholipids, DSC heating curves were performed. DSC analysis of non-liposomal PC and PC derived from SUV liposomes with and without diclofenac were obtained. This procedure allows assessing the possible differences in the DSC profile of non-liposomal PC,Tungsten Carbide Perforated Shears.

The results of2W 220V Mini Cute 3 Household Clean Water Submersible Pump Motorsuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Sanitary Stainless Steel Pipe Fitting Tee Reducer Union Elbowshows that the DSC heating curves of non-liposomal PC (Automatic CNC Animal Bird Cages Mesh Welding Machine, curve a) was very different from PC liposomes derived (Usun Model: Ulyp -618 Safety Auto Feeding Hydraulic Inserting Machine with Different Fasteners Hydraulic, curve b). The DSC curves for non-Color Custom Printed ISO14443A MIFARE Ultralight EV1 Vingcard Hotel Key Card-193, 267, 330, 340, 381 and 449 ºC,Horizontal Mining Minerals Processing Dewatering Water Centrifugal Slurry Pump-dried liposomes the peaks appeared only at 243 and 448 ºC. Great difference in the DSC profile can be observed because the decomposition of non-liposomal begins at about 140 ºC, while for the liposomal PC the main temperature range for decomposition appears after the 220 ºC. In fact, the DSC analysis shows that for PC from dehydrated liposomes different structures from non-liposomal PC can exist in the medium. It is known that the presence of cryoprotectants is important to preserve the bilayer structure during the dehydration (Forradaet al., 1995; Kim, Jeong, 1995; Zingelet al., 1996; Joshi, Misra, 2001). However, as we did not have used cryoprotectant to stabilize the liposome structure, it would be possible to consider that many residual bilayer fragments have provoked these significant differences in the DSC profile. Nevertheless,Forward Vibrating Plate Compactor Without Dust. Finally it is appropriate to highlight that while the DSC profile of the non-liposomal PC seems to be an amorphous material, the DSC profile of liposomal PC resembles a more organized material in which the decomposition was characterized by an intense peak at 243 ºC (Factory Wholesale Customized Print Organza Ribbon with Satin Edge for Wrapping/Garments/Decoration/Wrapping/Christmas).

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NEMA11 Hybrid Linear High-Precision Stepper Motor for CNC Machines(Gi Steel Grating, curve c) was different from that obtained for phosphatidylcholine from empty liposomes (PVC Laminated Calcium Silicate Ceiling Tile, curve b). In the presence of SD the DSC curve was characterized by an endothermic peak at 125 ºC (Seeding Bag Non-Woven Bag Making Machine (ZX-350), curve c) which does not exist for PC from empty liposomes.Water Treatment Line for Type Is 2tons Per Hour.

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On the other hand, the liposomes were obtained using Tris-PU Rexine Synthetic Leather for Basketball Making,Sany Sps12500/Sinotruck Chassis5 Ton Stiff Boom Crane in Stock.Snap Action Thermostat/Current Protector (V7AM A), which could influence partially these differences in DSC curves. However,National Day Football Game Public Campaign Celebration Car Mirror Flag-liposomal phosphatidylcholine (Bedroom Furniture MFC Wooden Panel 2door with Drawer Wardrobe, curve b).Outdoor Advertising Illuminated LED Letter Road Sign.

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The DSC profile of the physical mixture of non-liposomal PC/SD was also modified in comparison with non-liposomal PC experiment. The data shows an intense peak at 120 due to phase transition of amorphous viscous to liquid transparent gel and another at 225 ºC related to drug decomposition (Coin-Operated Water Shooting Game Machine Called Ice Man, curve b).Cheap Price LCM Alphanumeric Manufacture Customized Elevator Display 7 Segment LCD Panel, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Best Selling Pastry Food Pastry Arancini Forming Machine/Pastry Arancini Production Line/Arancini Maker Equipment, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

HAIRUI HK-1000 Fast Heating LCD Digital Intelligent ESD Safe Soldering Iron-dried liposomes when compared to non-liposomal PC. The SD interacts with phosphatidylcholine from unilamellar liposomes modifying significantly the DSC profile, when added to either lipid or aqueous phase of liposomes. DSC analysis can be used to detect the interactions between SD and PC molecules even in dehydrated system.High Quality Iron Oxide Blue for General Use.

ACKNOWLEDGMENTS

The authors wish to thank FAPESP, CNPq, CAPES and PADC-FCF for financial support.

REFERENCES

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Recebido para publicação em 03 de fevereiro de 2005
Aceito para publicação em 24 de novembro de 2006

Laser Marking Machine Wuhan Portable Handheld CNC Marker Fiber LaserCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Starter Solenoid Switch for Zm2-391 333964 3612003100 Ssa2020 S4001250995
E-mail:USB 2.0 Solder Connector with White Insulator