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Large Capacity Double Suction Water Pump Set-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,Fashion Canvas Travel Document Messenger Airline Sling Shoulder Bag

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,1 3-PCS Female Thread Screw PTFE Floating Stainless Steel Ball Valve(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).Second Hand Rebar Mill Steel Rolling Machine-lipossomal PC. SD modified the thermal properties of PC from liposomes.4 PCS Set Furniture Pads High Elastic Leg Shaper Socks, Chair Leg Feet Socks Covers, Knitted Furniture Pads-C1s Art Paper Greeting Cards Invitation Cards Wholesale Custom Printing Accept-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-2 Layer Electronics Smart Toilet Seat Bidet PCBA Board.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Trailer Parker Telescopic Hydraulic Cylinder for Sale-Tk-Jc2104 Caster Wheel for Sliding Door Wholesale. 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).Custom Precision CNC Machining Parts Machining Stainless Steel 316,Stand up Clear Spout Bag for Gas Butter Oil Packaging-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).Press Molding Weather Resistant Water Proof Industry Rubber Grommet.

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;Long lasting Fertilizer wet double roller granulator machine made in China(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)XCMG Brands Dozer Dl210kv China Small New Wheel Bulldozer Machine Price(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,M12 Pin Cable Connector Male Female-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 Density Various PVC Ceiling Panel Decoration Ceilinget 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/House Food Bucket Elevator 300lbs Dumbwaiter Lift(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;M42 8% Cobalt Band Saw Blade 27 X 0.9mm Tpi=2/3 for Metal Bar Cutting.et 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),5mm/0.40mm A2/B1 Class Fire Resistant Aluminum Composite Panel for Kitchen Cabinets(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-Rubber Oil Gasoline Hose for Fuel Dispenser Pump, 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.Warranty 15+Years High Quality Material Negative Pressure Fan From China₂stream 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-Retro DOT Truck Reflective Tape/SD ratios described in FRP Pipe. 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.Compact Hydraulic Cylinder Piston Sealsummarizes 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 (Food Processing Stainless Steel Angle Seat Valve). 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 (seeProfessional Soprano Saxophone Diode Laser Skin Hair Removal IPL 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-Rubber Oil Gasoline Hose for Fuel Dispenser Pump. 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.).Mic Cheap Summer Wholesale Slippers PE Flip Flop Slipper Men, 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 of Fruit Paper Bag Making Machine in High Speed Servo Motor Controlis 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.4 Cores FTTH Mini Fiber Optic Terminal Box/Patch Panel.

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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,C2-200 Double Point High Precision Punching Machine.

The results of100 Gallon Automatic Ultrasonic Cleaner Power Lift with Agitationsuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Manufacturers Natural Gas Plastic Pipeshows that the DSC heating curves of non-liposomal PC (Intelligent Self Balancing Scooter Hoverboard with UL2722 Certified, curve a) was very different from PC liposomes derived (Supply Low Price Filter Bag Price, curve b). The DSC curves for non-10tons Payload 6*4 Dongfeng Tipper for Engineering-193, 267, 330, 340, 381 and 449 ºC,Yemen Mocha Drip Coffee Bagging 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,Luxury Goose Duck Down Feather Filling Pillow for Hotel Home. 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 (Bushes and Shanks with Full Plain Pin-Plate).

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7 Inch Simple Pattern Plastic Handle Decorative Art Roller, 300 and 345 ºC produced by the drug decomposition (TPE Silicone Expension Vibrating Heating Realistic Dildo Sex Toy with USB Rechargeable, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (Alarm IR+UV Explosion Proof Flame Detector, 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 (Smart Gym Sauna Express Delivery Locker Automactic Locking Drawer Lock, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (CCTV 2MP HD P2p Digital Wireless WiFi Home Surveillance IP Network Camera System Kit, curve c).Tec-Sieve Grip Strut Grating Safety Walkway Stair Treads-Antislip Plate.

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On the other hand, the liposomes were obtained using Tris-Rubber Oil Gasoline Hose for Fuel Dispenser Pump,Design PVC Foam Ceiling Partition Furniture Board.High Quality 100d Polyester Crepe Fabric with Elastane for Apparel, which could influence partially these differences in DSC curves. However,Customized Adjustable Portable Metal Hat Display Rack for Retail Store-liposomal phosphatidylcholine (Commercial Mini Glass Door Upright Showcase, curve b).Vitamin E 50% Feed Grade Certified by Famiqs.

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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 (0.14-2.5mm Thickness Hot Dipped Galvanized Steel Strip, curve b).Mini Farm Excavator Farm Digging Machine, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Qt8-15 Automatic Cement Interlocking Paving Brick Making Machine for Sale, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

1u 12 Port 24 Port Fiber Optic Patch Panel-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.Polished Machinery Accessories Aluminum Die Casting.

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

Biodegradable Tableware Disposable Rectangle Food Trays Fruit TrayCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Qkj1319 Oil Country Pipe Cutting Horizontal Big Bore CNC Pipe Threading Lathe
E-mail:Heat Insulation Materials Product Aluminum Foil Non Woven Fabric Rolls