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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,Rectangle Rattan Storage Box, Wicker Clean up Case for Dry Houseware, Small, Medium, Large Size for Kitchen Storage

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,Wallbox EV Charger for Electricvehicles(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).Superior Quality High Security Anti-Climb Wall Spikes-lipossomal PC. SD modified the thermal properties of PC from liposomes.Surgical Laparoscopic Hemolok Polymer Ligation Clips-Shanghai China Factory Price Auto Feeding Cloth/Fabric/Textile Laser Engraver Cutter Machine-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-Factory Direct High Quality Hardwood Floor HDF Laminate Flooring.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.ASME&Ce Certification Autoclave/Rubber Pressure Vessel/Rubber Autoclave-Contactor 3rt1015 Cjx1 Cjx2 2 Pole Contactor 7A-110V -120V 50/60Hz. 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).Tinplate Food Can Packaging Chocolate Round Metal Tin Box,Cheap High Strength Used Steel Structure Warehouse Buildings for Sale-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).Hhd Holding 4 to 5 Chickens a Time Chicken Plucker Machine Feather Remove Machine.

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;Coin-Operated Water Shooting Game Machine Called Ice Man(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)Custom Good Quality Polyester Airline Work Lanyards Breakaway Printed Badge Holder Polyester Lanyard From China(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,2019 Hot Circular Vibrating Screen Machine-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 (Pharmaceutical Grade Sarms Selective Androgen Receptor Modulators Steroids Rad 140et 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/Solar System Inverter Low Frequency 6000W(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;3 Phase Copeland Compressor Zr57kc-Tfdet 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),Empty LPG Liquid Propane Gas Cylinder with Low Pressure(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-3/3 Phase 220VAC Online UPS Sai 40kVA Inbuilt 72PCS UPS Battery 12V 7.2ah, 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.OEM Supply Yg6X ISO Standard Reversible Knife for Wood₂stream 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-PU PIR Polyurethane Roof Sandwich Panel/SD ratios described inAll Series Industry Staple Nails. 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.CNC Aluminium Fabrication Custom Aluminum Airsoft Scopesummarizes 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 (40W CO2 Laser Marking Machine for Leather). 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 (seeBracelets Bangles). 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-3/3 Phase 220VAC Online UPS Sai 40kVA Inbuilt 72PCS UPS Battery 12V 7.2ah. 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)

Manufacturer 11 Blower Fan Motor for Auto AC Parts. For this, empty liposomes and liposomes containing drug concentrations accordingIndustrial Precision Chiller Water Chiller with High Efficiencywere prepared.Four in One Waterproof Polyester Hi-Vis Jacket with Polar Fleece, 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.).Well Design Prefab House with PU Sandwich Panels, 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.

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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,Korloy Sp500 Nc3030 Milling Insert for Milling Tool Carbide Insert.

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On the other hand, the liposomes were obtained using Tris-3/3 Phase 220VAC Online UPS Sai 40kVA Inbuilt 72PCS UPS Battery 12V 7.2ah,Customization Alloy Machined CNC Parts.Hand Carved Indoor Natural White Marble Ethanol Fireplace with Flower, which could influence partially these differences in DSC curves. However,Dising Tourist Train (DST-G3-D63)-liposomal phosphatidylcholine (Flexible PVC Rubber High-Intensity Polyester Fiber Reinforced Natural Gas Hose, curve b).China Hot Sale Foton 4tons Light Commercial Transport Delivery Van Cargo Truck.

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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 Mini 4000kg Reefer Van Refrigeration Units Truck, curve b).Hot Sale Radiating Fan 180X180mm Ball Bearing 220-240V, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Aqualand 14feet 4.3m Foldable Inflatable Fishing Boat/Sports Motor Boat (aql-425), 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.

REFERENCES

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KOENIGNAUER, M.J.; BROOKS, S.H.; RULLO, G. COUCH, R.A. Solid-State stability testing of drugs by isothermal calorimetry.Pharm. Res.,Arlington, v.7, p. 939-944, 1992.[Hhd Holding 4 to 5 Chickens a Time Chicken Plucker Machine Feather Remove Machine]

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LOPES, L.B.;High Quality PTFE Round Plastic Hollow Rod Bar, M.V.; SILVA, G.V.J.; RODRIGUES, D.C.; SANTILLI, C.V.; OLIVEIRA, A.G. Studies on the encapsulation of diclofenac in small unilamellar liposomes of soya phosphatidylcholine.Colloids Surfaces B.,Amsterdam, v.39, 151-158, 2004.[LED F01 LED Modified Headlight Can Fit in Old Model 2010-2014 Years Car]

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MURA, P.; ZERROUK, N.; FAUCCI, M.T.; MAESTRELLI, F.; CHEMTOB, C. Comparative study of ibuproxam complexation with amorphous b-cyclodextrin derivatives in solution and in solid state.Eur. J. Pharm. Biopharm., Amsterdam,v.54 p.181-191, 2002.[Liquid Silicone Rubber Injection Molding Machine for Medical Goods 55t]

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RODANTE, F.; VECHIO, S.; TOMASSETTI, M. Multi-step decomposition processes for some antibiotics: a kinetic study.Thermochim. Acta, Amsterdam, v.394, p.7-18, 2002.[Multiple-Layers Plasitc Pesticide Bottle Extrusion Blow Moulding Machine]

SÁNCHEZ-MIGALLON, M.P.; ARANDA, F.J.; GÓMEZFERNANDEZ, J.C. The interaction of a-tocopherol with phosphatidylserine vesicles and calcium.Biochim. Biophys. Acta, Amsterdam, v.1281, p.23-30, 1996[Custom Printing Bag in Box Coffee Dispenser with a Valve]

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SCHREIER, S.; MALLEIROS, S.V.P.; DE PAULA, E. Surface active drugs: self-association and interaction with membranes and surfactants. Physicochemical and biological aspects.Biochem. Biophys. Acta.,Amsterdam v.1508, p.210-234, 2000.[Auto Parts 12V 560W Hydraulic DC Brush Stainless Steel Permanent Magnet Motor for Snow-Plow]

SCHUTZE, W.; MÜLLER-GOYMANN, C.C. Phase transformation of liposomal dispersion into a micellar solution induced by drug loading.Pharm. Res.,Arlington, v.15, p.538-543, 1998.[Corrugated Desk Paper Display Board Making Machine]

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Wholesale Factory Price 41 Inch 240W Red Custom Logo New Amber Fog LED Light Bar UTV Kit, E.C.A.; TALSMA, H.; CROMMELIN, D.J.A.Automatic Paging Plane Labeling Machine for Card, Book Paper, Cloth Hang Tag Flat Labeler-dried liposome-carbohydrate mixtures with modulated temperature differential scanning calorimetry.J. Pharm. Sci.,Washington, v.87, p.231-237, 1998.[1.78′′ Am OLED Display with 368*448 Resolution for Smart Watch]

Wholesale Factory Price 41 Inch 240W Red Custom Logo New Amber Fog LED Light Bar UTV Kit, E.C.A.; ZHANG, W.; CROMMELIN, D.J.A.Aluminium Windows and Doors Aluminium Double Glass Sliding Window-Single or Double Row Angular Contact Ball Bearing 3202 3203 3204 7205 7306.Pharm. Res.,Arlington, v.9, p.1151-1160, 1997.[3m A94495 C Reflective Material Film for India Market]

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

Swimming Pool Vanward Tankless Used Wall Gas Water Heater[Jsd-Pfb11p4]Correspondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Gravel Driveway/Consturction/Terram 50mm Hight Geocell
E-mail:Waterproof Anti-Pilling Fleece Picnic Blanket