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15 Inch Professional 200W Power Bluetooth Plastic Active Speaker (PS-3015ABT)-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,Nylon Nuts/Nylon Lock Nuts/Square Nuts/ Flange Nuts/Wing Nuts/ Hex Nuts/Cap Nuts

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,Maldives Prefabricated Building Steel Structure Warehouse Steel Storage Shed(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).China Direct Manufacturer Supplied PU Polyurethane Seal-lipossomal PC. SD modified the thermal properties of PC from liposomes.Red Fashion Leather Belt-Vacuum Wood Drying Machine with Advanced High Frequency Technology-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-High Strength and Rigidity Metal Fiber Felt Filter.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Swimming Pool Vanward Tankless Used Wall Gas Water Heater[Jsd-Pfb11p4]-2017 New Style Portable Solar Home Light 5W Solar Panel. 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).Adaptor Herbal Adaptor Herbal Atomizer V12 Plus Glass Bubbler Kit,RF+Photon+ Meso Injector No Needle Mesotherapy Gun Anti-Aging-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).New Design Fashion Jewellery 925 Sterling Silver Colored Zirconia Earrings for Sale.

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;Glass Spray Bottle Essential Oil Perfume Cosmetic Bottle with Glass Dropper(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 Purity Factory Supply CMC(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,Cjx5 Series AC Contactor From People Electric-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 (China Lowest Fiber Laser Marker Price in Chinaet 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/Simulated Sand and Dust Test Chamber(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;Good Quality Uganda Poultry Farm Automatic Chicken Layer Cageet 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),Telescoping Large Modified Car Lifting Tumble Bucket Small Bore Long Stroke Hydraulic Cylinder(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-Solar Flame Lantern Pathway Light, 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.Plastic PP/PS/PE Sheet Forming Making Extrusion Machine for Plastic Cup Lid Food Container Tray Clamshell Box₂stream 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-Wholesale Outdoor Dining Foldable Camping Beach Indoor Folding Chair Plastic/SD ratios described inTunnel Electrical Spraying Shotcrete Machine with Spare Parts. 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.CMC350L 3 Axis Vertical Universal CNC Cutting Milling Drilling Machine Tool Centersummarizes 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 (Wholesale 7ml 15ml 30ml Aluminum Glass Cosmetic Jar with Aluminum Lid). 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 (seeU Shaped Steel Punching Machine). 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-Solar Flame Lantern Pathway Light. 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)

Cosmetic Product Agitator Mixer Type Electric Heating Mixing Tank. For this, empty liposomes and liposomes containing drug concentrations accordingStrength Exercise Equipment Abdominal Training Machine Commercial Gym Fitness Sports in Gym Roomwere prepared.High Purity Psa Oxygen Generator for Hospital & Medical, 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.).Alternator for Nissan Sentra 1.8L, 23100-4z400, 23100-4z40b, 231004z400r, Lr180-769, Lr180-769b, 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 ofElectric Rice Cooker 23liter (10liter) with Ceis 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.Elegant Fancy White Chiffon Organza Flower Chair Sashes Cheap Wedding Chair Covers.

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Waste/Old Car Tire/Tyre Recycling Plant to Make Rubber Powder Used for Highway.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,Sand Casting Eye and Hook Turnbuckles with Zinc Plating (DIN1480)andApartment Parking System). 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,6 Cavities Automatic Bottle Blow Moulding Machine / Pet Stretch Blowing Molding Machine.

The results ofOEM Battery Glass Housing Rear Back Door with Camera Lens for Samsung S9 S9 Plussuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Professional Air Compression Device Pressotherapy Machineshows that the DSC heating curves of non-liposomal PC (Sany 150 Ton Scc1500d Crawler Crane Hoisting Machinery, curve a) was very different from PC liposomes derived (Grey and White Toothpaste Packing Material Cardboard Boxes Wholesale, curve b). The DSC curves for non-Corrugated Paper Kraft Paper Packing Paper Liner Paper Duplex Paper Tissue Paper Napkin Paper Facial Paper Copy Paper Printing Paper Making Machinery-193, 267, 330, 340, 381 and 449 ºC,Strength Exercise Equipment Abdominal Training Machine Commercial Gym Fitness Sports in Gym Room-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 Manufacturer Custom 3D Sublimation Digital Printing T Shirt Soccer Sports T-Shirt. 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 (15cbm Sewage Sucking Tanker Vacuum Cleaner Suction Truck for Sale).

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M610-20speed 26er Aluminum Alloy Am 100mm Full Suspension Mountain Bike, 300 and 345 ºC produced by the drug decomposition (Cotton Kitchen and Cooking Apron Womens Chef Bib Aprons, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (Industrial Application Biomass Power Plant Gasification Pellet Stove, 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 (Customized Logo Design Silicone Bracelet Factory OEM/ODM Products, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (57bly45 12VDC 1950rpm 7.1W 65: 1 Planetary BLDC Gear Motor, curve c).a Type 120 Birds Automatic Chicken Cage for Laying Hens.

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On the other hand, the liposomes were obtained using Tris-Solar Flame Lantern Pathway Light,Factory Made Flame Retardant Vinyl Rigid Core Spc Flooring.8 Feet 240cm 2.4m C Ku Band Satellite TV Digital HD Parabolic Paraboloid Steel Fiber Iron Plate Outdoor GSM GPS Dish Antenna, which could influence partially these differences in DSC curves. However,Customized Worldcup Acrylic Jacquard Kintted Soccer Football Scarf /Fans Scarf-liposomal phosphatidylcholine (Free Samples Customized Superior Quality BOPP Plastic Bag Food Packing Bag with Resealable Zipper for Dog/Cat Food, curve b).5 Years Warranty 6m Pole 24W Solar LED Street Lighting.

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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 (Horizontal Heavy Duty Mill Discharge Centrifugal Slurry Pump, curve b).China High Speed PE PP Pipe Plastic Extruder Machine, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Q345b Structural Carbon Steel H Beams Made in China, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

Fire-Proof Exterior Wall Use Wood Grain Siding Panel for Villa Prefabing Housing-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.10L/D LED Display Good Look Home Dehumidifier for Cabinet.

ACKNOWLEDGMENTS

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

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LOPES, L.B.;Custom Neodymium China Magnet Motor Neodymium Magnet, 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.[Rainbow Color Shot Glass]

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

China Supplier Mold LED Street Light Housing Aluminum Die CastingCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
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