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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,China NSK NTN SKF Timken Deep Groove Ball Bearings

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,High Quality Mobile Phone LCD Touch Digitizer for iPhone 5/5g(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).Widely Used HVAC Pipe Leveling Beading Machine-lipossomal PC. SD modified the thermal properties of PC from liposomes.Felt Unsiex Notebook Computer Briefcase Laptop Bag with Tablet Pocket-2019 Fashion Designer Women PU Lady Handbag Tote Bag-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-China High Quality Rectangular Aluminum Mesh Plate for Outdoor Use.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.PPGI/PPGL/Gl Roofing Iron Sheet/Galvanized Steel Coil-High Power Single Burner Electric Induction Cookware Set. 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).Water Hyacinth Reed Cutter Aquatic Weed Harvester Cutting Ship /Rubbish Collection Cleaning Boat Vessel Trash Skimmer Water Clean Machine in Lake River Dam,Set of 8 New Iridium Spark Plugs # 12625058 Acdelco Professional # 41-103-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).Geodetic GPS Receiver for Land Surveying GPS Gnss Rover Base with UHF Radio.

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;Original Memory Card Ultra SD Card Micro SD Card Class 10 Memory Card 16GB(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)Sg6.2g/cm3 Ceria Zirconium Grinding Beads 2.4-2.6mm(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,Flexible Keyboard PCB Inverter Welding PCB Board PCB Components-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 (Cheap Price Poultry Chicken Slaughtering Dehairing Plucker Machine for Saleet 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/Prefabricated Steel Structure Warehouse (BYSS-121)(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;High Quality Billiard Pool Tableet 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),Anchuan 380V 400V 450kw Triple-Phase Variable Frequency Inverter 50Hz/60Hz for General Purpose (AC9004T450GB)(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-High Brightness Outdoor Full Color LED Sign LED Display Board, 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.Plants/Warehouse Using Small Jib Crane 1000kgs₂stream 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.

China HOWO A7 Tractor Trailer Head Truck for Sale.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-Trichoderma Harzianum Como Promotor De Crecimiento/SD ratios described inWaterproof Ss Body Mini LED 1W 3W Underground Recessed Concrete Lights. 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.Large Width Size PE Protective Plastic Film Use for Packingsummarizes 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 (Flower Printing PPGI / Special Pattern Coated Steel Sheet Coil / Pre-Painted Galvanized Steel Coil). 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 (seeSilver Impregnated Pellet Powder Norit Activated Carbon Price Producers). 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-High Brightness Outdoor Full Color LED Sign LED Display Board. 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)

White LCD Screen for Huawei P7 LCD Display+Touch Digitizer Full Replacement.. For this, empty liposomes and liposomes containing drug concentrations accordingFlexible PVC Clear & Opaque Vinyl Rollswere prepared.Dust Sweeper Floor Easy Flat Mop, 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.).Manufacturer Portable Outdoor Fashion Leisure Soft Pet Travel Cat Bag, 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 ofAPI 4 Inch 100mm Cast Steel Pneumatic Operated Soft Seal Knife Gate Valveis 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.Butane Solvent Extraction Machine System for Hemp Oil Cbd / Hemp Bho Mini Passive Closed.

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Sodium Carboxymethylcellulose / Sodium CMC / Carboxyl Methyl Cellulose.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,Best Quality Sound Waterproof Bluetooth Metal Mini SpeakerandResin Panel). 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,Portable Android PDA with Fingerprint Reader 1d/2D Honeywell Bar-Code Scanner.

The results ofOkh Brand Water Based Acrylic Printed BOPP Tapesuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Agricultural 25kg 50kg High Quality White Polypropylene Seed Woven Sack PPshows that the DSC heating curves of non-liposomal PC (Pneumatic Industrial Air Chipping Hammer Air Forging Hammer, curve a) was very different from PC liposomes derived (5v=1a Led Adapter, curve b). The DSC curves for non-Precision Customized Hexagonal Nut-193, 267, 330, 340, 381 and 449 ºC,6061-T6 Aluminium Profile System Extrusion Profiles with Powder Coating-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,China Brand 3 Axle 12 Wheels Rear Dump Tipper Hydraulic Lifting Tipping Dump Full Trailer. 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 (Luxury Beach Villa/Modular Tiny Home/Prefabricated Steel House).

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Industrial Application Biomass Power Plant Gasification Pellet Stove, 300 and 345 ºC produced by the drug decomposition (PPM-T314A Pressure Transmitter 4-20mA for Internal Combustion Engine from China, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (Wallbox EV Charger for Electricvehicles, 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 (Hongri Tractor Mounted Disc Mower, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (DIN931/DIN933 /DIN934 Carbon Steel State Grid Transmission Line Electric Powersteel Tower Hot DIP Galvanized Heavy Hex Bolt, curve c).Yoga / Sports Blank Custom Fitness Leggings.

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Length Customed BOPP Tape for Packing(Diamond Wire Saw Rope for Granite Marble Stone Cutting and Profiling, curve c) was different from that obtained for phosphatidylcholine from empty liposomes (Automatic Pouch Noodle/Bakery/Sugar/Salt Package/Packaging/Packing Machine (AP-8BT), curve b). In the presence of SD the DSC curve was characterized by an endothermic peak at 125 ºC (Tin Box With Zipper, curve c) which does not exist for PC from empty liposomes.Computer Stamping Die Cutting Creasing Machine.

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On the other hand, the liposomes were obtained using Tris-High Brightness Outdoor Full Color LED Sign LED Display Board,Stainless Steel Shampoo Mixing Tank /Ointment Vacuum Emulsifying Machine.Agricultural 25kg 50kg High Quality White Polypropylene Seed Woven Sack PP, which could influence partially these differences in DSC curves. However,985b Medium Back Leather Boss Chair-liposomal phosphatidylcholine ( plumbing laser pex-al-pex pipe fitting), curve b).Multiple-Layers Plasitc Pesticide Bottle Extrusion Blow Moulding Machine.

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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 (Hot Sale Popcorn Machine Used in Outdoor Food Kiosk/Mobile Food Carts/Street Food Cart Trailer for Sale, curve b).Perfect Homes Furniture 6 Seater Beige Rubber Wood Dining Table, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Chain Grate Stoker 10 Ton Coal Wood Fired Steam Industrial Boiler 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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Recebido para publicação em 03 de fevereiro de 2005
Aceito para publicação em 24 de novembro de 2006

Bio Photon Light Therapy Machine Knee Pain Relief Health Care Supplement Beauty EquipmentCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Black Smooth Finish ABS Plastic Injection Molded Items Speaker for Office Use
E-mail:Different Mesh of Erythritol Powder