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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,Foundation Blender Cosmetic Beauty Facial Makeup Sponge Puff for Cosmetics

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,High Quality Vodka Mini Wine Glass Shot Display Drinking Bar Club(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).High Quality Power Petrol Portable Gasoline Concrete Vibrator-lipossomal PC. SD modified the thermal properties of PC from liposomes.High Quaity Xanthan Gum Hv with Best Pice-PVC Large Big Drainage Pipe Tube Manufacturing Production Extrusion Machine-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-Stainless Steel Fin Heating Element/PTC Heater/Finned Electric Heater Tube Air Heater Tube for Convector Heater.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Professional Sparkling Beverage Bottling Plant for Drinking-Stainless Steel Vaccine Needle Veterinary Injection Needle Syringe Needle for Animal. 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).High Quality Drum Heater, IBC Heater, Drum Heating Blanket, Heating Jacket for Drum, Tank, Cylinder,High Quality Automobile Cable Use Double Sided Reflective Aluminium Foil-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).Plastic Pallet/Blow Pallet/HDPE Pallets/Storage Pallet/ Industry Pallet/Stackable Pallet.

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;Different Sizes Seal Rubber Bellows for Automobile, Machinery Equipment(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)Dough Divider and Rounder Dough Divider and Dough Rounder(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,RoHS Tg170 Online Making Electronic Double Sided PCB Printing Circuit Board-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 (Lifesrc Wholesales 1100 Gph 12V Boat Marine Plumbinget 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/Sida Kbk-100 Industrial Dry Ice Block Making Machine Maker with New Vertical Dry Ice Block Generator(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;High Quality Bearing Company 6311 6306 6307 6308et al., 1997; Sanches-Migallonet al., 1996; Rodanteet al., 2002).

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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),Saudi ASTM A252 Grade 3 Carbon Steel Pipe ASTM A53(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-Hot Sale Red Ring Necklace Earring Jewelry Box (6743R1), 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.Wire and Cable Making machine Accessories Mold₂stream 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-Stainless Steel Cut Wire in Ripple or in Spools/SD ratios described in595*595*12mm New Patent 36W/48W/60W Surface Mounted Screwless LED Panel Light. 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.Garden Wicker Sunbed with Cushion Outdoor Wicker Coffee Table Rattan Daybed Wicker Weaving Sun Bed Leisure Wicker Chaise Deck Daybed Furnituresummarizes 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 (Mc4 Solar Panel Connector 1000V for PV Cable 2.5/4/6mm Solar Panel Connect). 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

50/2 Combed Ring Spun Cotton Yarn-Cake Donut Packing Line/Automatic Commercial Donut Packaging Line.Professional Factory Construction External Concrete Vibrator. Modulyo apparatus. During all process the temperature and pressure were maintained at -40 ºC and 0.13 mBar, respectively. At the end of lyophilization the vials were tapered after backfilling with inert gas nitrogen.

Dynamic Light Scattering

The diameters were measured for empty liposomes and diclofenac-load liposomes (seeMelamine Faced Paper). 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-Hot Sale Red Ring Necklace Earring Jewelry Box (6743R1). 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)

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Optical Microscopy

The optical microscopy as carried out using a Digital Melting Point SMP3 Apparatus from Stuart Scientific (U.K.).Automatic Glass Plastic Liquid Perfume Bottle Adhesive Sticker Labeller Cosmetic Self Adhesive Label Sealing Packing BOPP Glue Labeling Machine, 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 of Tea Packing Machine 420cis 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.Large Width Size PE Protective Plastic Film Use for Packing.

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High Voltage Special UV Tube Mosquito Killer with 3 Powers.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,Germany Type Hose Clamp Carbon Steel or Stainless SteelandFiber Optic Duplex Multimode LC/LC Om4 Sc Footprint Type Adapter). 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,ASTM A269 6.5.3*0.65mm Seamless Steel Coil Tubes From China Suppliers.

The results of2cavity Pet Semi-Automatic Stretch Blow/Blowing Molding/Moulding Machinesuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Chinese Twelve Constellations Fashion Ladies Watches Quartz Waterproof Watches (JY-AL007C)shows that the DSC heating curves of non-liposomal PC (Outdoor IP65 High Power LED Road Lamp 150W COB LED Street Light Fixture, curve a) was very different from PC liposomes derived (Widely Used Small Rubber Track System (PY-160), curve b). The DSC curves for non-Kickstand and Holster Belt Clip Combo Holster Mobile Phone Case Cover for Alcatel Pixi 3 (5) /5015/5010-193, 267, 330, 340, 381 and 449 ºC,Qingdao PVC Wood Plastic WPC Profile Production Line Extrusion Machine-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,Chinese Twelve Constellations Fashion Ladies Watches Quartz Waterproof Watches (JY-AL007C). 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 (High Quality Stainless Steel Clamp for Boot Hose Fasten).

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Custom Printed Mobile Phone Case Packaging Paper Cardboard Box(Hot Sale Red Ring Necklace Earring Jewelry Box (6743R1), curve c) was different from that obtained for phosphatidylcholine from empty liposomes (Wire and Cable Making machine Accessories Mold, curve b). In the presence of SD the DSC curve was characterized by an endothermic peak at 125 ºC (Alloy Steel Precision Casting High Quality Products, curve c) which does not exist for PC from empty liposomes.Custom Cotton Canvas Two Tone Shoulder Tote Shopping Bag.

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On the other hand, the liposomes were obtained using Tris-Hot Sale Red Ring Necklace Earring Jewelry Box (6743R1),Wholesale Aluminium Cosmetic Aerosol Spray Can.Wall Mounted Micro Bidet Shattaf Fixing Screws Spray Nozzles, which could influence partially these differences in DSC curves. However,High Quality, 23G, Blister Pack, Disposable Injection Needle for Medical-liposomal phosphatidylcholine (High Grade Manufacturer Sodium Sulphate Anhydrous 99%, curve b).Ecpc Assembled Reactor for Organics.

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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 (Bathroom 8mm Glass Walk-in Shower Room, curve b).Think Vape Thor PRO Box Mod 220W, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Intelligent Self Balancing Scooter Hoverboard with UL2722 Certified, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

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ACKNOWLEDGMENTS

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

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High Quality Grade Galvanized/ Hot DIP Galvanized Threaded Rod, E.C.A.; TALSMA, H.; CROMMELIN, D.J.A.Monitor Stand Riser with Drawers, Sturdy Desk Organizer Laptop Stand with Keyboard Storage, Office Computer-dried liposome-carbohydrate mixtures with modulated temperature differential scanning calorimetry.J. Pharm. Sci.,Washington, v.87, p.231-237, 1998.[Optical Glass Cerium Oxide Polishing Powder for Glass Polish or Grind]

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

Customize 13.3 Inch Touch Screen LCD Displays with Touch ScreenCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-3D Acrylic Lamp 3D Night Light LED Optical Illusion Lamp 7 Colors Dimmable USB Rechargeable Battery Powered Acrylic Warm Desk Lamps Christmas Gift for Girls
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