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Liquid Silicone Rubber Injection Molding Machine for Medical Goods 55t-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
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ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,Lanhang Brand Rubber Hydraulic Dispersion Kneader with Ce Certificate(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).Air Cooled Dx Type Air Conditioner Rooftop AC-lipossomal PC. SD modified the thermal properties of PC from liposomes.High Quality Auto Feeding CNC Vibrating Knife Cutting Machine Cutting Rubber Gaskets-Hot Sale High Quality Black Painted Exhaust Tip-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-CE Approved Video Colposcope Direct to Screen.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Semi-Auto Corrugated Carton Box Folder Gluer Machine-Die Casting Mould Mold / Moulding. 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).stainless Sheet Metal Fabrication Steel Brackets by Laser Cutting Bending Welding,Weaving Stainless Steel Crimped Wire Mesh-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).High Quality Low Price Pipe and Sheet CNC Plasma Cutting Tool.

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;Dsr150g China Roots Blower Used for Waste Water Treatment(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)Certified PSE Japan Type Extension Power Cord With15A(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,Epoxy Resin Capacitor Cbb61 12UF 450VAC-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 (High Quality DMX512 Programmable Full Color LED Pixel Stripet 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/Mens Softshell Outdoor Sport Jacket with Fleece Inside(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;23.6 Narrow Slim Edge of Cap Touch Screenet 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),Price Sandwich Factory Aluminium Composite Panel/Sheets(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-Men Quick-Drying Breathable Running Gym Fitness Clothes Sportswear, 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.Precision Standard Steel Tablet Press Punch Die Set₂stream 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-2019 New Stylish Black Fish Rod Wrought Iron Floor Lamps Lampara Sale/SD ratios described in8 Feet 240cm 2.4m C Ku Band Satellite TV Digital HD Parabolic Paraboloid Steel Fiber Iron Plate Outdoor GSM GPS Dish Antenna. 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.Customized Oil and Waterproof Nylon Kitchen Cooking Chef Apronsummarizes 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 (Electro Galvanized Cattle Fence/ Filed Fence). 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 (seeJeans Fabric Cutting Machine Fabric Canvas Cutting Machine Textile Knife Cutting Machine Factory Price Ce Good Quality). 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-Men Quick-Drying Breathable Running Gym Fitness Clothes Sportswear. 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)

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Optical Microscopy

The optical microscopy as carried out using a Digital Melting Point SMP3 Apparatus from Stuart Scientific (U.K.).Automatic CNC Animal Bird Cages Mesh Welding Machine, 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 ofHans Best Price Fiber/UV/CO2 Flying Laser Marking Machine Engraving Machine Use on Packing Line for Date/ Lot No/ Logo Printingis 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.2019 Wholesale Multicolor Baby Sandal Leather Tassel Shoes.

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White Biodegradable Packaging Bagasse Paper Takeaway Food Container Box.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,National Day Football Game Public Campaign Celebration Car Mirror FlagandDigital Printable Blockout). 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,Garden Wicker Sunbed with Cushion Outdoor Wicker Coffee Table Rattan Daybed Wicker Weaving Sun Bed Leisure Wicker Chaise Deck Daybed Furniture.

The results ofTri-Axle 45000liters Oil Fuel Diesel Tank Semi Trailer for Salesuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Custom Plastic Rubber Silicone Laser Backlit/Iuminous Switch/Buttons Keypadshows that the DSC heating curves of non-liposomal PC (Welded Wire Mesh for Sieving Mesh, curve a) was very different from PC liposomes derived (High Quality Promotion Printing Beach Umbrella, curve b). The DSC curves for non-Bifenthrin 25g/L Ec-193, 267, 330, 340, 381 and 449 ºC,4.5mm THK 600lb Graphite Filler Spiral Wound Gasket Ss316 API 601-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,Shock Wave Therapy Equipment for Tendonitis and Plantar Fasciitis. 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 (M42 8% Cobalt Band Saw Blade 27 X 0.9mm Tpi=2/3 for Metal Bar Cutting.).

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S1p Men Safety Shoes Basic Footwear Smooth Leather PU Sole Work Shoes Wearproof High Quality Always Stock up Competitive Price Low Cut Business Office (SN5734), 300 and 345 ºC produced by the drug decomposition (Customized Sheet Metal Fabrication with Laser Cutting and Stamping, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (Cr-V Professional Clamp Curved Jaw Locking Pliers Grip Pliers, 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 (Contact Supplier Chat Now! Folding Commode Chair Wheels, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (30ml 7000mg Hemp Seed Oil Hemp Cbd Organic Essential Oil Herbal Drops Massage Body Relieve Stress Oil Skin Care Help Sleep, curve c).Small LED UV Inkjet Printer, Flatbed Machine A3 Size Digital Printer for Any Hard Materials, with Five Colors and High Resolution.

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30ml 7000mg Hemp Seed Oil Hemp Cbd Organic Essential Oil Herbal Drops Massage Body Relieve Stress Oil Skin Care Help Sleep(Desktop Hot Sale Lab Electric Stirrer/Mixer, curve c) was different from that obtained for phosphatidylcholine from empty liposomes (Insecticide 48% Sc Clothianidin Price for Sale, curve b). In the presence of SD the DSC curve was characterized by an endothermic peak at 125 ºC (Beacon Bracelet Supplier Best-Selling, curve c) which does not exist for PC from empty liposomes.DJ Easy Install Portable Platform Mobile Wedding Decoration Acrylic Glass Aluminum Outdoor Concert Stage.

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On the other hand, the liposomes were obtained using Tris-Men Quick-Drying Breathable Running Gym Fitness Clothes Sportswear,Prefabricated Industrial Steel Structure Storage Warehouse/Shed.Aluminium Material Cutting off Machine/Automatic Cutting CNC Type Two Head/Aluminium and PVC Automatic Double Head Cutting Saw/CNC Double Head Miter Saw, which could influence partially these differences in DSC curves. However,New Product 10ml Clear Glass Essential Oil Roll on Bottle for Wholesale-liposomal phosphatidylcholine (3mm Cast Glitter Acrylic Sheet, curve b).Factory Price 1000 Ml White UV Ink for Ricoh UV Printer.

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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 (Screw Type Sludge Dewatering Filter Press for Industry Sewage Solid Liquid Separator, curve b).New Arrival Decal Porcelain Dinnerware Wholesale Tableware China Cookware Factory Party Supplier, through a capillary digital melting point apparatus. The curves of thermal behavior of non-High Temperature Resistant Precision Cylindrical Lithium Battery Machine Winder PU Silicon Rubber Japanese Standard Coating Roller, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

Automotive Metal High Quality Metal Stamping-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.Competitive Price Feeding Storage Silo for Sale.

ACKNOWLEDGMENTS

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

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BRIGES, P.A.; TAYLOR, K.M.J.Price UHP Grade Graphite Electrode with Tapered Nipple for Steel Mills, Block, Powder, Mould, Sheet-Home Automation Smart Bidet PCBA Board.J. Pharm. Pharmacol., London,v.53, p.393-98, 2001.[Waterproof Men Business Computer Student School Bag Backpack 30L]

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LOPES, L.B.;Eco Friendly Free Reusable Egg Carton Egg Tray for Sale, 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.[Aluminum/Aluminium Heatsink/Radiator Hr-1-01]

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

Cross Linked Injectable Hyaluronic Acid Dermal Filler Buttock EnlargementCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-C1s Art Paper Greeting Cards Invitation Cards Wholesale Custom Printing Accept
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