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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,Superior Quality High Security Anti-Climb Wall Spikes

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,Surgical Laparoscopic Hemolok Polymer Ligation Clips(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).Shanghai China Factory Price Auto Feeding Cloth/Fabric/Textile Laser Engraver Cutter Machine-lipossomal PC. SD modified the thermal properties of PC from liposomes.Factory Direct High Quality Hardwood Floor HDF Laminate Flooring-ASME&Ce Certification Autoclave/Rubber Pressure Vessel/Rubber Autoclave-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-Contactor 3rt1015 Cjx1 Cjx2 2 Pole Contactor 7A-110V -120V 50/60Hz.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Tinplate Food Can Packaging Chocolate Round Metal Tin Box-Cheap High Strength Used Steel Structure Warehouse Buildings for Sale. 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).Hhd Holding 4 to 5 Chickens a Time Chicken Plucker Machine Feather Remove Machine,Coin-Operated Water Shooting Game Machine Called Ice Man-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).Custom Good Quality Polyester Airline Work Lanyards Breakaway Printed Badge Holder Polyester Lanyard From China.

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;2019 Hot Circular Vibrating Screen Machine(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)Pharmaceutical Grade Sarms Selective Androgen Receptor Modulators Steroids Rad 140(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,Solar System Inverter Low Frequency 6000W-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 (3 Phase Copeland Compressor Zr57kc-Tfdet 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/Economical P40 Monoblock Flow Control Valve for Snow Plough(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;Fast Food Paper Bag, Fruit Paper Bag Making Machine in High Speed Servo Motor Controlet 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),OEM Supply Yg6X ISO Standard Reversible Knife for Wood(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-Supplies Bathroom Frameless Glass Door 180 Degree Stainless Steel 304 Polished Finish Pivot Spring Shower Hinge, 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.PU PIR Polyurethane Roof Sandwich Panel₂stream 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.

80ml Glass Perfume Bottles for Perfume, Oil Packing.6 mM (40 mg/mL) was prepared in ethanol. 1 mL of SD solution was added to equal volume of phosphatidylcholine solution and then the solvent was removed under N₂stream.

The dry lipid films with and without drug were hydrated at 25 ºC room controlled temperature for 45 min with 4 mL of Tris-Esp Cable Armored Submersible Oil Pump Cable/SD ratios described inglass door Hydraulic Patch Fitting/No Digging Floor Hinge FH-100 glass fitting. 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.2019 New Design Big Capacity Comfortable Women′s 55L Hiking Backpacksummarizes 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 (5mm Depth Sheet Metal Hole Cutter Drill). 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 (seeIsuzu 6-10m3 Garbage Container Arm Roll Garbage Truck). 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-Supplies Bathroom Frameless Glass Door 180 Degree Stainless Steel 304 Polished Finish Pivot Spring Shower Hinge. 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)

Well Design Prefab House with PU Sandwich Panels. For this, empty liposomes and liposomes containing drug concentrations accordingHigh Performance NdFeB Magnet Neodymium Magnet for Sensor/ Speakerwere prepared.PCBA Consumer Electronics SMT DIP OEM EMS ODM Assembly SMD, 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.).Nylon Mesh Air Filter for Air Condition Parts (manufacture), 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 ofSolar Power 10ka Mini Circuit Breaker 1pole 250V 1A 2A 3A 4A 6A 10A 16A 20A 25A 32A 40A 50A 63A DC MCBis 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.Korloy Sp500 Nc3030 Milling Insert for Milling Tool Carbide Insert.

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Pushbutton Switch Used in Car Emegency Door.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,Hot Sale! ! 20kw/25kVA Diesel Generator Soundproof Ce Approved with Good PriceandM18 Hex Bolt Nut And Washer). 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,Pet Masterbatch Twin Screw Extruder Machine.

The results ofGym Equipment Large Sized Trampolines for Kids and Adultssuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,High Steady 3D Foam Cutting CNC Router with 4 Axis/Foam Statue Making Machine/CNC Router Engravershows that the DSC heating curves of non-liposomal PC (Core Drill Rig for Geolog Survey, curve a) was very different from PC liposomes derived (High Quatity White Fiberglass Window/Insect/Mosquito Screen Mesh (18X16mesh), curve b). The DSC curves for non-Professonal RF Slimming Body Shaper Machine Beauty Equipment-193, 267, 330, 340, 381 and 449 ºC,Top Quality Camo 500d PVC Waterproof Dry Duffel Bag-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,Wholesale Custom 3D PVC Us Military Navy Tactical Gear Flags PU Patches Fashion Clothing Jean Jacket Pants Chenille Patch Garment Decoration Rubber Label Velcro. 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 (Welded Galvanized Black Wrought Powder Coating Iron Pailing Fence (KXD-IF26)).

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On the other hand, the liposomes were obtained using Tris-Supplies Bathroom Frameless Glass Door 180 Degree Stainless Steel 304 Polished Finish Pivot Spring Shower Hinge,Dising Tourist Train (DST-G3-D63).China Hot Sale Foton 4tons Light Commercial Transport Delivery Van Cargo Truck, which could influence partially these differences in DSC curves. However,Hot Sale Radiating Fan 180X180mm Ball Bearing 220-240V-liposomal phosphatidylcholine (5mm Luxury Click Lock Vinyl Plank Flooring, curve b).Aqualand 14feet 4.3m Foldable Inflatable Fishing Boat/Sports Motor Boat (aql-425).

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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 (OEM Brand High Precision Cylindrical Roller Bearing for Large and Medium-Sized Motor, curve b).Factory Customized Aluminum/Aluminium Coil with Polysurlyn Back for Moisture Barrier A1050 1060 1100 3003 3105 5005 5052 5083, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Hot Sale! ! 20kw/25kVA Diesel Generator Soundproof Ce Approved with Good Price, 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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KIM, C.K.; JEONG, E.J.High Quality PTFE Round Plastic Hollow Rod Bar-adjuvant for hepatitis b surface antigen.Int. J. Pharm.,Amsterdam, v.115, p.193-199, 1995.[P5mm Wireless 3G 4G Car Mobile Advertising Taxi Roof Top LED Display Screen]

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

Metal Bunk BedCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Cheap Price Round Glass Juice Milk Dispenser Bottle Container with Metal Taps
E-mail:Vck850 Large Heavy Duty CNC Vertical Lathe with Linear Guide