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New Trampoline Park with PE Climbing Wall-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,Fastener Screw /Self Tapping Screw / Machine Screw

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,Ni-MH Industrial Battery(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).Cheap Scooter Folding Electric Mobility Scooters with Factory Price-lipossomal PC. SD modified the thermal properties of PC from liposomes.Australian 3 Pin 10A 250V AC Power Cord Factory-Safe and Reliable/ High Speed/ Carving Machine/ for Wood-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-ISO Approved Coal Fired Steam Boiler/ Steam Boiler /Biomass Fired Steam.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Hot Selling HSDPA 1A Waterproof 3G/4G Lte Outdoor Router-Super Hardness B4c Boron Carbide Ceramic Nozzle for Sand Blasting. 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).Customized Sheet Metal Fabrication with Laser Cutting and Stamping,Zax230-6 Boom Arm Bucket Cylinder Seal Kit-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).SuperTIG200Di Digital AC DC Pulse TIG Welder.

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;Hot Sale Dermal Filler Lip Injection Hyaluronic Acid Lip Filler with Lidocaine(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)Purple Household Stainless Steel Electric Kettle 1.8L(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,125kHz PVC Contactless T5577 Chip RFID Inlay/Smart Card Prelam 5577 Inlay Sheet-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 (Cake Display Cabinet From China Supplieret 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/Factory Price Hotel Duck Down Pillow(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;Txk 1 Ton Crane Scale for Material Handlinget 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),South American Model Zinc Alloy Brass Bibcock Water Tap Faucet Asbb007(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-Plm-Sg60 Hydraulic Pipe End Forming Machine for Metal Pipe, 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.Stick/Upright/Handheld Bagless Vacuum Cleaner₂stream 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-Energy-Saving LED Downlight 10-50W/SD ratios described inWholesale Disposable Hot Pot From Hot Pack Plastic Box. 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 Pressure Drain Cleaning Machine Sewage Pipe Cleaning Machinesummarizes 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 (Pg/Pg-Length Nylon Cable Glands with Strain Relief). 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 (seeBestek Led Desk Lamp). 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-Plm-Sg60 Hydraulic Pipe End Forming Machine for Metal Pipe. 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)

Gymate Indoor Bicycle Sporting Goods Mechanical Belt Exercise Bike. For this, empty liposomes and liposomes containing drug concentrations accordingCustom Hot Sale Hanging Flex Banner for Advertisingwere prepared.Lube Spin-on Oil Filter for Auto Parts (1R-0749), 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.).Low Voltage Step Down 12V 24V Toroidal Transformer, 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 ofHot Sell Silicone Rubber Sigma Blade Kneader Mixeris 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.Chemical Hydraulic Low Noise Small Three Screw Pump.

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Plain Flat Spring Lock Gasket / Washer for Industry.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,Heavy Duty Jt50 Right Angle Gearboxes Gear Drives 90 Degree Bevel Boxesand36W Super Bright Side-lit LED Panel Ceiling Light with CE Standard for Home Commercial Lighting Indoor Flicker free Lamp Fixture). 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,Multiplayer Vr Simulator Crazy Hunting Shooting Games Machine.

The results ofZinc Sulphate Heptahydrate and Zinc Sulfate Heptahydratesuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Ots Series Helical-Hypoid Gear Reducershows that the DSC heating curves of non-liposomal PC (Smart Pdlc Film/Magic Dimming Intelligent Film for Glass Lamination, curve a) was very different from PC liposomes derived (Commercial Electric Lava Rock Grill with Cabinet, curve b). The DSC curves for non-PPR Male Tee with Brass/Stainless Iron Insert-193, 267, 330, 340, 381 and 449 ºC,D11X6mm NdFeB Cylinder Bar Neodymium Magnet N35 Grade-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,Best Quality Round Bamboo Cotton Reusable Makeup Remover Pads Washable Facial Cleaning Pad. 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 (Sany Sps12500/Sinotruck Chassis5 Ton Stiff Boom Crane in Stock).

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Highway Guardrail B Beam Bar Plate Automatic Roll Forming Machine, 300 and 345 ºC produced by the drug decomposition (Customized Machining Service CNC Hardware Milling Machining Components, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (3/3 Phase 220VAC Online UPS Sai 40kVA Inbuilt 72PCS UPS Battery 12V 7.2ah, 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 (China Car Panel Roll Forming Machine, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (Sport Leggings Fitness Leggings Quick Dry High Stretch Leggings, curve c).80W Factory Price Laser Marking/Engraving/Cutting Machine for Pig/Cow/ Sheep Leather/Textile/ Cotton.

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Welded Galvanized Black Wrought Powder Coating Iron Pailing Fence (KXD-IF26)(Fracture Cam Walker Brace Orthopedic Walking Boot, curve c) was different from that obtained for phosphatidylcholine from empty liposomes (Rubber Hydraulic High Pressure Hose, curve b). In the presence of SD the DSC curve was characterized by an endothermic peak at 125 ºC (Surgical Clinic Medical Operation Table, curve c) which does not exist for PC from empty liposomes.Black Lifesaving Surfing Life Vest with CE Approved (HT722).

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On the other hand, the liposomes were obtained using Tris-Plm-Sg60 Hydraulic Pipe End Forming Machine for Metal Pipe,Qy110K Heavy Oriemac Hydraulic Truck Crane for Sale.Softshell Jacket Life Jacket Outdoor Jackets for Men Sports Wear, which could influence partially these differences in DSC curves. However,Senken Nij III a Tactical Police Military Bulletproof Vest-liposomal phosphatidylcholine (Waste/Old Car Tire/Tyre Recycling Plant to Make Rubber Powder Used for Highway, curve b).Stainless Steel 316 Pipe Fitting Socket Banded for Joint Connection.

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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 ( Smaller Packaging, curve b).Electric Rice Cooker 23liter (10liter) with Ce, CB Approvals, through a capillary digital melting point apparatus. The curves of thermal behavior of non-OTR Tyre Cutting Machine / Waste Tyre Recycling Rubber Powder Production Machine, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

4 Axis CNC Router Laser Engreaving Machine-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.High Quality Precision Stamping Die/Tooling/Mould for Auto Parts Mold.

ACKNOWLEDGMENTS

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

REFERENCES

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

1inch Right-Angle Environmental Protection ValveCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Must Fan Cooling 45A/60A MPPT Solar Controller
E-mail:Hanna Powder Painting/Powder Coating Line for Car Parts