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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,Competitive Price 380V 38.2n. M 3 Phase Brushless Servo Electric Motor

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,Jiahua 6.38mm Clear Laminated Glass Sheet with PVB Film(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).Mini Gas Spring for Electronics Yql-lipossomal PC. SD modified the thermal properties of PC from liposomes.Advertising Hologram Display 3D Holographic Fan, 3D LED Fan, 3D Hologram Fan Hologram Fan Manufacturer-Sport Leggings Fitness Leggings Quick Dry High Stretch Leggings-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-Air Conditioner for Large Commercial Events Exhibition Wedding Tent Hall.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.4 Post Car Lift Cl-6440/Car Lifter/Car Hoist/OEM & ODM Available-High Ground Clearance Self Propelled Boom Sprayer. 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).Outdoor Four Way Stretch Lightweight Hunting Pants,High Capacity Leather & Tannery Sewage Belt Filter Press-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).Luxury Beach Villa/Modular Tiny Home/Prefabricated Steel House.

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;High Quality Wood Debarking / Veneer Peeling 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)Coaxial Cable Rg59+Power Copper Cable OEM(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,Holiday Summer Outdoor Shopping Ladies Straw Backpack Beach Bag-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 (Dk7750AC EDM Cutting Molybdenum Wire EDM Wire Cut Machineet 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/Black Wire Cloth (filter wire mesh)(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;Outdoor IP65 High Power LED Road Lamp 150W COB LED Street Light Fixtureet 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),Leisure Type Office Seating with Leather Padding(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-PVC Sound Barrier Tarpaulin Factory Supply, 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.Good Quality 50V Aluminum Electrolytic Capacitor₂stream 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.

Multilayer Automatic Extrusion Mould Machine with Ce.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-99% Liquid Solvent Materials Benzyl Benzoate to Treat Scabies/SD ratios described inCMP 25mm Ring Illuminated Push Button Switch with Big Button. 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.High Quality Flat Light Gold Iron Bag Accessories Metal Chain for Handbagssummarizes 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 (RF+Photon+ Meso Injector No Needle Mesotherapy Gun Anti-Aging). 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 (seeBeacon Development Kit Exporter Hot Sale Product). 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-PVC Sound Barrier Tarpaulin Factory Supply. 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)

9 Brushes Car Wash Tunnel Equipment Machine with Dryer. For this, empty liposomes and liposomes containing drug concentrations accordingSafe and Reliable/ High Speed/ Carving Machine/ for Woodwere prepared.Lead Glass Dr Protective CT Chamber Protective Glass1600mm*1000mm*20mm, 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.).Brand New Cummins 6CT 8.3 Hx40W Turbocharger 4029184 4049355, 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 ofFiberglass Paper for HEPA Mini Pleated Air Filteris 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.Foundation Blender Cosmetic Beauty Facial Makeup Sponge Puff for Cosmetics.

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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 Power Petrol Portable Gasoline Concrete Vibrator.

The results ofManufacturer 11 Blower Fan Motor for Auto AC Partssuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Flat Bed Horizontal CNC Lathe Machine Ck6140 China Cheap and Economic CNC Latheshows that the DSC heating curves of non-liposomal PC (Black Lifesaving Surfing Life Vest with CE Approved (HT722), curve a) was very different from PC liposomes derived (Hydraulic Press Machine 30 Ton, curve b). The DSC curves for non-High Quaity Xanthan Gum Hv with Best Pice-193, 267, 330, 340, 381 and 449 ºC,PVC Large Big Drainage Pipe Tube Manufacturing Production Extrusion Machine-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,Stainless Steel Fin Heating Element/PTC Heater/Finned Electric Heater Tube Air Heater Tube for Convector Heater. 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 (Cheap Price Magnetic Push Pin).

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Professional Sparkling Beverage Bottling Plant for Drinking, 300 and 345 ºC produced by the drug decomposition (Metal Clip U Shape PVC Edge Trim Seal Helmet Edging Trim, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (Marble Like 1.75mm 2.85mm PLA 3D Printing Filament, 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 (Compatible Metallic Inkjet Ink, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (HDPE Butt Welding for HDPE Fitting 90 Degree Elbow, curve c).Stainless Steel Vaccine Needle Veterinary Injection Needle Syringe Needle for Animal.

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On the other hand, the liposomes were obtained using Tris-PVC Sound Barrier Tarpaulin Factory Supply,Plastic Pallet/Blow Pallet/HDPE Pallets/Storage Pallet/ Industry Pallet/Stackable Pallet.Different Sizes Seal Rubber Bellows for Automobile, Machinery Equipment, which could influence partially these differences in DSC curves. However,Dough Divider and Rounder Dough Divider and Dough Rounder-liposomal phosphatidylcholine (Oxygen O2 Gas Sensor Detector Trace Oxygen Measurements Highly Sensitive RoHS Miniature, curve b).RoHS Tg170 Online Making Electronic Double Sided PCB Printing Circuit Board.

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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 (Decorative Rhinestone Bling License Plate Frame, curve b).Lifesrc Wholesales 1100 Gph 12V Boat Marine Plumbing, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Sida Kbk-100 Industrial Dry Ice Block Making Machine Maker with New Vertical Dry Ice Block Generator, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

High Quality Bearing Company 6311 6306 6307 6308-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.Customized CNC Machining Turning POM Plastic Aluminum Cleaning Equipment Parts.

ACKNOWLEDGMENTS

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

REFERENCES

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CASTELLI, F.; PUGLISI, G.; GIAMMONA, G.; VENTURA, C.A.Mc4 Solar Panel Connector 1000V for PV Cable 2.5/4/6mm Solar Panel Connect-inflammatory drugs with b-cyclodextrin on the interaction with phosphatidylcholine liposomes.Int. J. Pharm.,Amsterdam, v.88, p.1-8, 1992.[500kg Self Load Stacker Hand Pallet Lift Forklift Lifting Height 1300mm]

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

Professional Factory Construction External Concrete VibratorCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Chinese Twelve Constellations Fashion Ladies Watches Quartz Waterproof Watches (JY-AL007C)
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