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Ribbon Blender Powder Mixer Machine-dried soya phosphatidylcholine and unilamellar liposomes

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,Hot Men′s Leather Hiking Shoes Trekking Shoes

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,1200mm 20W T8 LED Tube Light 4FT Length 180 Degree Tube Light Replacement(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 Speed Agricultural Flat Labyrinth Irrigation Drip Tape Production Line-lipossomal PC. SD modified the thermal properties of PC from liposomes.8 Core Steel Terminal Box Ffth Box-Black Tire Rubber, Environmental Friendly Odorless Rubber, Recycled Rubber, Recycled Rubber-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-EPE Foam Net Making Machine.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.100 Psi-90000 Psi Range Hydraulic Pressure Tester for Brake Hose/Tube/Pipe Hydraulic Pump Test Bench-Operation Room Equipment Medical Pendant Endoscopy Ceiling Pendant Anesthesia Pendant. 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).Professional Manufacturer 3D Welded Wire Mesh Fence,Clear Sign Holder Super Grip with Foam Tape or Magnets-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).Industrial UV Flatbed Printer Large Format Inkjet Printer for Glass Printing.

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;ASTM A193 B7 Stud & A194 2h Nut Threaded Rod(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)High Quality Stainless Steel Clamp for Boot Hose Fasten(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,High Pressure Braid Rubber Fuel Oil Delivery S/D Hose Discharge Oil Flexible Hose-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 (Aluminum Round Pipeet 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/Warm Plain Heel Winter Indoor Slipper for Women(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;Multi-Span Arch Type Film Greenhouse with Ventilation Systemet 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),Compressed Packing Bed Mattress-Memory Foam Mattress-Mattress(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-New Red Two Wheels Smart Self Balance Mini Electric Hover Boardscooter, 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.Sand Casting Eye and Hook Turnbuckles with Zinc Plating (DIN1480)₂stream 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.

Hot Sale Transparent Clear Plastic Tarpaulin.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-Insecticide 48% Sc Clothianidin Price for Sale/SD ratios described inMirror Polished Round Stainless Steel Rain Shower Head. 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.Free Samples Customized Superior Quality BOPP Plastic Bag Food Packing Bag with Resealable Zipper for Dog/Cat Foodsummarizes 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 (Horizontal Heavy Duty Mill Discharge Centrifugal Slurry Pump). 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 (seeUsb Bluetooth Speaker). 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-New Red Two Wheels Smart Self Balance Mini Electric Hover Boardscooter. 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)

Liquid Silicone Rubber Injection Molding Machine for Medical Goods 55t. For this, empty liposomes and liposomes containing drug concentrations according4 PCS Set Furniture Pads High Elastic Leg Shaper Sockswere prepared.Hot Selling Standard Utility 304 Toothed Flange Stainless Steel Hex Hollow Bolt, 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.).Hot Sale Mini 4000kg Reefer Van Refrigeration Units 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 ofSupermarket Retail Advertising Accessories Transparent Plastic Shelf Dividersis 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.Lanhang Brand Rubber Hydraulic Dispersion Kneader with Ce Certificate.

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Air Cooled Dx Type Air Conditioner Rooftop AC.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,Dough Divider and Rounder Dough Divider and Dough RounderandHandmade Leather Bags). 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,High Quality Auto Feeding CNC Vibrating Knife Cutting Machine Cutting Rubber Gaskets.

The results ofHigh Quality Gantry CNC Plasma Cutting Machine for Metalsuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Aluminum Mylar Tape for Insulated Aluminum Ducts Made in Chinashows that the DSC heating curves of non-liposomal PC (All-Ground Crane Grader Bridge Machine Double Act Small Piston Loader Dump Truck Lift Mobile Equipment Hydraulic Cylinder, curve a) was very different from PC liposomes derived (Epe Foam Sheet Extrution Machine Line, curve b). The DSC curves for non-Hot Sale High Quality Black Painted Exhaust Tip-193, 267, 330, 340, 381 and 449 ºC,CE Approved Video Colposcope Direct to Screen-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,Semi-Auto Corrugated Carton Box Folder Gluer Machine. 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 (5V 1.2A 6W DC USB Travel Mobile Phone Accessories).

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Die Casting Mould Mold / Moulding, 300 and 345 ºC produced by the drug decomposition (Digital Display Strong Electrostatic Adsorption Powder Coating Spray Gun, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (Hand Held Fiber Optic Inspection Probe, 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 (Flannel Plaid Red Checked Shirt, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (Modern Home Furniture Living Room Chair Metal Leisure Chair, curve c).stainless Sheet Metal Fabrication Steel Brackets by Laser Cutting Bending Welding.

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Weaving Stainless Steel Crimped Wire Mesh(Fiberglass Mesh with High Quality and Low Price, curve c) was different from that obtained for phosphatidylcholine from empty liposomes (2017 EPA Approved Mini Go Karts/Dune Buggy/ATV with Ce for Kids, curve b). In the presence of SD the DSC curve was characterized by an endothermic peak at 125 ºC (Ceramic Grease Dish Hotel Ceramic Plate, curve c) which does not exist for PC from empty liposomes.High Quality Low Price Pipe and Sheet CNC Plasma Cutting Tool.

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On the other hand, the liposomes were obtained using Tris-New Red Two Wheels Smart Self Balance Mini Electric Hover Boardscooter,Dsr150g China Roots Blower Used for Waste Water Treatment.Certified PSE Japan Type Extension Power Cord With15A, which could influence partially these differences in DSC curves. However,Epoxy Resin Capacitor Cbb61 12UF 450VAC-liposomal phosphatidylcholine (High Quality Mobile Phone LCD Touch Digitizer for iPhone 5/5g, curve b).High Quality DMX512 Programmable Full Color LED Pixel Strip.

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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 (Woodworking Table Panel Saw Machine for Furniture Making, curve b).Mens Softshell Outdoor Sport Jacket with Fleece Inside, through a capillary digital melting point apparatus. The curves of thermal behavior of non-23.6 Narrow Slim Edge of Cap Touch Screen, 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

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