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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,Pharmaceutical Grade Sarms Selective Androgen Receptor Modulators Steroids Rad 140

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,Solar System Inverter Low Frequency 6000W(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).3 Phase Copeland Compressor Zr57kc-Tfd-lipossomal PC. SD modified the thermal properties of PC from liposomes.Economical P40 Monoblock Flow Control Valve for Snow Plough-Fast Food Paper Bag, Fruit Paper Bag Making Machine in High Speed Servo Motor Control-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-Empty LPG Liquid Propane Gas Cylinder with Low Pressure.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.3/3 Phase 220VAC Online UPS Sai 40kVA Inbuilt 72PCS UPS Battery 12V 7.2ah-OEM Supply Yg6X ISO Standard Reversible Knife for Wood. 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).Supplies Bathroom Frameless Glass Door 180 Degree Stainless Steel 304 Polished Finish Pivot Spring Shower Hinge,PU PIR Polyurethane Roof Sandwich Panel-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).80ml Glass Perfume Bottles for Perfume, Oil Packing.

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;Esp Cable Armored Submersible Oil Pump Cable(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)Loctite Glue Loctie 596 Super Glue for Plastics Rubber(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,Manufacturer 11 Blower Fan Motor for Auto AC Parts-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 (Four in One Waterproof Polyester Hi-Vis Jacket with Polar Fleeceet 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/Well Design Prefab House with PU Sandwich Panels(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;PCBA Consumer Electronics SMT DIP OEM EMS ODM Assembly SMDet al., 1997; Sanches-Migallonet al., 1996; Rodanteet al., 2002).

Nylon Mesh Air Filter for Air Condition Parts (manufacture). 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,Korloy Sp500 Nc3030 Milling Insert for Milling Tool Carbide Insert.

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),Pushbutton Switch Used in Car Emegency Door(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-Pet Masterbatch Twin Screw Extruder Machine, 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.Professonal RF Slimming Body Shaper Machine Beauty Equipment₂stream 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-Wholesale Custom 3D PVC Us Military Navy Tactical Gear Flags PU Patches Fashion Clothing Jean Jacket Pants Chenille Patch Garment Decoration Rubber Label Velcro/SD ratios described inCustom Logo Printed Gift Shopping Brown Kraft Paper Bag. 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.N & L OEM Wooden Garage Cabinet with Drawerssummarizes 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 (Men Top Quality Customizing Printing Logo Fashion Sweater Hoody). 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 (seeChina Carbon Steel Pipe). 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-Pet Masterbatch Twin Screw Extruder Machine. 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)

Hand Carved Indoor Natural White Marble Ethanol Fireplace with Flower. For this, empty liposomes and liposomes containing drug concentrations accordingBlank Plastic Yellow Card of Cr80/30mil for Retailer Stockwere prepared.Dising Tourist Train (DST-G3-D63), 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.).China Hot Sale Foton 4tons Light Commercial Transport Delivery Van Cargo Truck, 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 ofDescriptionmaterial: PP+ Cardboardsize: 280X315X50mmsuitable for: A4color: Black/Red/Green/Bluepackage Included: 1X Lever Arch File Folderis 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.Hot Sale Radiating Fan 180X180mm Ball Bearing 220-240V.

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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,Factory Customized Aluminum/Aluminium Coil with Polysurlyn Back for Moisture Barrier A1050 1060 1100 3003 3105 5005 5052 5083.

The results ofISO Approved Coal Fired Steam Boiler/ Steam Boiler /Biomass Fired Steamsuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Biodegradable Disposable Food Packaging Boxshows that the DSC heating curves of non-liposomal PC (Building Material Roof Custer Tile 410*280*12mm, curve a) was very different from PC liposomes derived (Gas Nozzle for Concrete Mixer, curve b). The DSC curves for non-Hot Sale! ! 20kw/25kVA Diesel Generator Soundproof Ce Approved with Good Price-193, 267, 330, 340, 381 and 449 ºC,Building Greenhouse Roofing Material Polycarbonate PC Panel-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,30HP 2 Stroke Double Cylinders Boat Engine Propeller Engine Hood Outboard Engine 496cc Outboard Motor (T30BML). 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 (Black Smooth Finish ABS Plastic Injection Molded Items Speaker for Office Use).

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6 Layer Printed Circuit Board for Industrial Control, 300 and 345 ºC produced by the drug decomposition (Flower Pattern Color Printing PPGI Steel Coil Factory, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (IP66 Gery Color Outdoor Enclosure Wall Mount Cabinet, curve b) can be related to phase transition from amorphous solid to liquid product, appeared shifted to lower temperature (125 ºC) when SD was added to the lipid phase during the liposome preparation (8inch Erw Steel Pipe, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (ASTM A269 6.5.3*0.65mm Seamless Steel Coil Tubes From China Suppliers, curve c).Brass Nozzle Spring Coil Heater.

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KERONG Digital Combination Swipe Card Lock Filing Cabinet(Fashionable Felt Women Handbag Large Capacity Tote Bag with Milky White, curve c) was different from that obtained for phosphatidylcholine from empty liposomes (Odor Removal Particulate Matter Activated Carbon Mask with Valve, curve b). In the presence of SD the DSC curve was characterized by an endothermic peak at 125 ºC (m.gl-fiber.com, curve c) which does not exist for PC from empty liposomes.Gymk Auto Feeding Flexo Printing and Slotting Die-Cutting Machine for Carton Making.

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On the other hand, the liposomes were obtained using Tris-Pet Masterbatch Twin Screw Extruder Machine,European Style Sanitary Ware Certificated Faucet for Kitchen Bath.2019 Winter New Vertical & Horizontal Heating Wire Mini Portable Desktop Electric White Fan Heater for Home Office (DH-QN06), which could influence partially these differences in DSC curves. However,High Quality PTFE Round Plastic Hollow Rod Bar-liposomal phosphatidylcholine (Eco Friendly Fire Resistant WPC PVC Interior Decorative Wall Panels Extrusion Line, curve b).40W CO2 Laser Marking Machine for Leather.

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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 (Ronggui Professional Nail Tools Foot Pedicure Callus Remover for Dead Skin Removal, curve b).51.7cc Professional Gasoline Grass Trimmer Brush Cutter with Ce, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Fashion Jewelry Silver Jewelry Stainless Steel G23 Titanium Body Jewelry Red CZ Cuting Titanium Weddiing Ring Tr2029, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

China Supplies OEM High Performence Steel Casting for Small Flywheel-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.Wholesale Factory Price 41 Inch 240W Red Custom Logo New Amber Fog LED Light Bar UTV Kit.

ACKNOWLEDGMENTS

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

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

Evitek D3s 6000k Normal HID Xenon Bulb for DC 12V 35W Xenon HID Kit HID LightCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Winter Thick Wool Socks
E-mail:Weaving Stainless Steel Crimped Wire Mesh