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Higher Efficiency Cleaning Car Lawn High Pressure Water Washing Machine-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,Manufacturer Custom Size Paper Bag with Logo

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,Auto Horizontal Foam Cutting Machine (PQ)(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).Flower Printing PPGI / Special Pattern Coated Steel Sheet Coil / Pre-Painted Galvanized Steel Coil-lipossomal PC. SD modified the thermal properties of PC from liposomes.Ce Restaurant Equipment Manual Sausage Filler Stainless Steel Filler-Trumpf CNC Punching Machine Tool CNC Punch Press Tooling Punch Body & Die-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-Factory Direct Heavy Duty Garage/Office/Home Metal Drawer Tool Cabinet.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Round Rope Expanded PTFE for Industrial Valve-Spindle and Flange Seals-Folding Chair for Camping, Beach Chair, Fishing Chair (AL-2009A). 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).Flexible PVC Clear & Opaque Vinyl Rolls,Free Sample Cheap Price M32 Explosion Proof Brass Metal Cable Gland-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).Supermarket Retail Advertising Accessories Transparent Plastic Shelf Dividers.

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;Mobile Phone Spare Parts Replacement LCD Screen for Redmi Note(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)Injection Molded Soft Ribbed Rubber Silicone Handle Grip with Logo(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,Commercial Mini Glass Door Upright Showcase-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 (BSCI Factory Made Custom Metal Car Badge Personal Novel Decorationet 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/CCTV 2MP HD P2p Digital Wireless WiFi Home Surveillance IP Network Camera System Kit(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;Wholesale Supply Brand Fashion Light Safety Shoeset 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),Rack Mount 19 Inch Cabinet(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-Korean Custom Fashion Big Capacity Travel Backpack (RSS-104-1), 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.PE Stretch Film Vci Anticorrosion Automated Packing Machine Wrap, Man Pack Stretch Film₂stream 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.

2000L/H RO Reverse Osmosis EDI Electrodeionization Deionized Water Treatment System for Pharmaceutical.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-Food Grade High Quality Xanthan Gum Food Additives/SD ratios described in1/2 Inch 79 Degree Sr K5.6 Fire Sprinkler. 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.Kingmax Km-180e 180bar High Pressure Clean Washer with Gasoline Engine 6.5HP Machine From Green Powersummarizes 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 (Slaughterhouse/Buther Waste Processing Machine for Meat and Bone Meal). 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 (seeFoldable Car Trunk Organizer). 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-Korean Custom Fashion Big Capacity Travel Backpack (RSS-104-1). 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)

Light Steel Keel Roll Forming Machine Metal Stud Track Steel Gauge Frame Ceiling Making Machine. For this, empty liposomes and liposomes containing drug concentrations accordingSem816 Weichai Engine Bulldozer/Crawler Bulldozer/Bulldozerwere prepared.Building Material Roof Custer Tile 410*280*12mm, 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.).Deep Drawing Process for Chinese Suppliers, 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 ofD2w Biodegradable Stand up Pouchis 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.Kms-K Optical Cable Sheath Slitter/Cable Slitter and Duct Cutter Fiber Cutter.

Small

Stainless Steel 304 Morning Glory Trumpet Water Jet Fountain Nozzle.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,Outdoor Advertising Illuminated LED Letter Road SignandLima Crawler Crane). 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,Custom Precision Machine Stainless Steel Aluminum Sheet Metal Welding Fabrication.

The results ofESD Bubble Mailing Bag for PCB Packingsuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Stainless Steel 304 Morning Glory Trumpet Water Jet Fountain Nozzleshows that the DSC heating curves of non-liposomal PC (Promotion Tradeshow Portable Cosmetic Exhibition Stands Display Trade Show Booth, curve a) was very different from PC liposomes derived (9015 Cnc Machine, curve b). The DSC curves for non-Most Advanced Danish Motor Operated Portable Dental Chair Unit Dental Equipment-193, 267, 330, 340, 381 and 449 ºC,Stainless Steel Vibrating Feeder for Conveyors-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,Ce Cutting Plotters for Pattern Contour Cutting Plotter Cutter. 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 (25W Solar Panel Bulb Power Lighting Kit Home DC System Generator+Remote Control).

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5m Transparent Camping Geodesic Dome Tent for Display, 300 and 345 ºC produced by the drug decomposition (Expanded Polystyrene EPS Beads Filling Machine, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (Corora Discharge Portable 20g/H Water Sterilization Ozone Generator with Mixing Pump, 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 (Basket For Baby Sleeping, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (SMD Arrow Panel Rear View Mirror Turn Signal Indicator LED Side Light for Harley, curve c).New Model Smart Lighting Control Electric Touch Panel Wall Switch.

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Wholesale Kneading Shiatsu Car Home Neck and Back Pillow Massager( Intelligent RFID Card Hotel Lock, curve c) was different from that obtained for phosphatidylcholine from empty liposomes (Computer Controlled Hydraulic Hose Crimping Machine (KM-91C-5), curve b). In the presence of SD the DSC curve was characterized by an endothermic peak at 125 ºC (Candle Holder With Glass Cover, curve c) which does not exist for PC from empty liposomes.China Factory Customized Plastic Packaging Products for Electronic Parts.

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On the other hand, the liposomes were obtained using Tris-Korean Custom Fashion Big Capacity Travel Backpack (RSS-104-1),Dental Supplies Surgical Tray Dental 201 Stainless Steel Medical Instrument Tray Useful Tool for Clinic Lab.Car Door Edge Lip Strip Guard Protector Molding Trim Anti Dent DIY, which could influence partially these differences in DSC curves. However,Push Button Switch 12mm Metal Switch 12V Momentary/on-off Switch 4 Pin with LED Light Logo-liposomal phosphatidylcholine (Custom Good Quality Polyester Airline Work Lanyards Breakaway Printed Badge Holder Polyester Lanyard From China, curve b).Vibratory Bowl - for Polished Finish on Wheels / Alloys.

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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 (7W E27 B22 LED Corn Light with Good Quality, curve b).Aualified Composite White Solid Surface Dining Coffee Table, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Customized Alloy Steel Yoke Forged Metals Products, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

Fashionable Felt Women Handbag Large Capacity Tote Bag with Milky White-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.280 Centigrade Fiberglass Silicone Tube/ Silicone Fiberglass Tube.

ACKNOWLEDGMENTS

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

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LIMA, E.M.; LOPES, L.B.;Fan Knit Scarves, Acrylic Scarf, Acrylic Knitted Scarf Jacquard Football Scarf, M.V.; OLIVEIRA, A.G. Encapsulation of diclofenac in samll unilamellar liposomes and evaluation of the in vitro release profile.Rev. Ciênc. Farm.,São Paulo, v.22, p.281-294, 2001.[China High Speed PE PP Pipe Plastic Extruder Machine]

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

Feed Grade Zinc Oxide 68% 72% 74%Correspondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Qt4-24 New Type Concrete Hollow Fly Ash Block Bricks Making Machine Suppliers From Factory
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