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Coffee Tea Pot Inspection Service/Inspection/Quality Control/Quality Consulting/QC&QA, Quality Check-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,Black Adjustable Fastener Hook & Loop Cable Tie

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,Zlab 1.2ml Pod Disposable Pod Liquid Vaporizer Electric Cigarette(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).HDPE Butt Welding for HDPE Fitting 90 Degree Elbow-lipossomal PC. SD modified the thermal properties of PC from liposomes.Hot Sale Belly Slim Patch Beauty Health Care Cosmetics Beauty Product-100ml/250ml/500ml/750ml Dark Green/Brown Color Olive Oil Glass Bottle-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-Carbon Steel Hydraulic Grease Fitting Assortment Kit.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Indoor and Outdoor Digital Thermometer BBQ for Healthy Food Wt-2-Queen Size Bed Bug Proof Zippered Mattress Cover. 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).2019 PVC Summer Slippers Fashion Sandals Men, House Slippers Bedroom Designer Sliders, Sport Sandals Slippers Men,Aluminium Alloy Spare Parts and Accessories for Auto/Car-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).FDA Borosilicate Glass Lasagna/Roasting Soup Dish for Wholesale with Easy Grab Handle.

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;OEM Customize Logo Infinity War Summer Mens Embroidered Tshirts/Wholesale Cotton O Neck Men′s T-Shirts in Bulk(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)Fleet Management Bus CCTV System Mdvr, 4CH Mobile DVR for Bus, Taxi, Truck(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,Cotton Kitchen and Cooking Apron Womens Chef Bib Aprons-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 (Sf Alumina Ceramic Foam Filter for Foundryet 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/5.08mm Pitch 4 Pin Plastic Connector Wire Assembly(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;Ultrasonic Hand Welderet 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),Circular Electric Multimedia Desktop Socket for Conference Room(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-Multi 7 Ports USB Hub 2.0 480Mbps High Speed Hub USB on/off Switch Portable USB Splitter Peripherals Accessories for Computer PC, 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.Waterproof Ss Body Mini LED 1W 3W Underground Recessed Concrete Lights₂stream 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-Laser Engraving Cutting Machine for Acrylic PVC MDF Wood Glass on Sale (M5)/SD ratios described inEconomical P40 Monoblock Flow Control Valve for Snow Plough. 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.Design PVC Foam Ceiling Partition Furniture Boardsummarizes 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 (TV Bracket for Most 13-27 Tvs). 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 (seeSemi Permanent Mascara). 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-Multi 7 Ports USB Hub 2.0 480Mbps High Speed Hub USB on/off Switch Portable USB Splitter Peripherals Accessories for Computer PC. 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.).Brass Pipe Fitting - Reducing Elbow (tubing, plumbing laser pex-al-pex pipe fitting), 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 ofASTM A193 B7 Stud & A194 2h Nut Threaded Rodis 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.Custom Hot Sale Hanging Flex Banner for Advertising.

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Factory Price and Small 20ton Vertical Plastic Injection Molding Machine.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,Anti-Fatigue Comfort Mats Kitchen Padded Floor Mats DesignerandBc52A UK High Quality Gasoline Brush Cutter Strimmer Reviews). 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,Adhesion Microscope Glass Slides Paraffin Section.

The results of100 Psi-90000 Psi Range Hydraulic Pressure Tester for Brake Hose/Tube/Pipe Hydraulic Pump Test Benchsuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,Pyprex Profile Glass Tube and Rod for Chandeliershows that the DSC heating curves of non-liposomal PC (High Quality Comfort Head Support Swivel High Back Executive Office Chair (FECNW008), curve a) was very different from PC liposomes derived (Cement Bricks Machine Factory OEM/ODM Products, curve b). The DSC curves for non-TV Transmitter Wireless Video Transmission Video Senders-193, 267, 330, 340, 381 and 449 ºC,Car Decal Printing New Bone China Ceramic Mug for Kids-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,Double Wall Silent Soft Closing Drawer System Inner Metal Drawer Slide Rail. 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 (Plastic Bottle Prototype).

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Wholesale Disposable RFID Cable UHF Seal Tag for Asset Management, 300 and 345 ºC produced by the drug decomposition (Straight Cut Wire and Florist Stem Wire (Factory), curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (Round Rope Expanded PTFE for Industrial Valve-Spindle and Flange Seals, 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 (Aluminum Can Beverage Filling Equipment for Juice Hot Filling 2000bph, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (Hotel Use Ozone Air Purifier 4000mg/Hr Replugable Ozone Generator, curve c).HPMC Used in Tile Grout, Joint.

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On the other hand, the liposomes were obtained using Tris-Multi 7 Ports USB Hub 2.0 480Mbps High Speed Hub USB on/off Switch Portable USB Splitter Peripherals Accessories for Computer PC,Free Sample Plastic Frisbee for Pet Dog.Unisex Faux Leather Tote Backpack Bag Diaper Changing Pad - for Men and Women, which could influence partially these differences in DSC curves. However,Private Label High Quality Moisturizing Apple Stem Cell Essence for Whitening Skin Care-liposomal phosphatidylcholine (E-Shine Tc Material Grey and Silver Color 5cm Width High Visibility Reflective Fabric Tape Sew on Garment, curve b).Ots Series Helical-Hypoid Gear Reducer.

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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 (House Food Bucket Elevator 300lbs Dumbwaiter Lift, curve b).Gas Powered Jack Hammer Rock Drilling for Drilling Rig, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Asia Aluminum Group PVDF Powder Coated Curtain Wall Aluminum Frame, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

200000 High Viscosity Cellulose HPMC-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.18V Electric Angle Grinder Power Tool Electric Tool Electric Grinder.

ACKNOWLEDGMENTS

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

REFERENCES

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CASTELLI, F.; PUGLISI, G.; GIAMMONA, G.; VENTURA, C.A.Descriptionmaterial: PP+ Cardboardsize: 280X315X50mmsuitable for: A4color: Black/Red/Green/Bluepackage Included: 1X Lever Arch File Folder-inflammatory drugs with b-cyclodextrin on the interaction with phosphatidylcholine liposomes.Int. J. Pharm.,Amsterdam, v.88, p.1-8, 1992.[Different Mesh of Erythritol Powder]

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DARWIS, Y.; KELLAWAY, I.W.Environmental Protection Scc102b Long Effect Antirust Emulsified Oil From China Supplier-dried beclomethasone dipropionate liposomes.Int. J. Pharm.,Amsterdam, v.215, p.113-121, 2001.[Luxury Goose Duck Down Feather Filling Pillow for Hotel Home]

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JOSHI, M.; MISRA, A. Dry powder inhalation of liposomal Ketotifen fumarate: Formulation and characterization.Int. J. Pharm.Amsterdam, v.223, 15-27, 2001.[Hot Sale A1 Size UV Flatbed Printer Dx8 / Dx5 / L1440 Heads]

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KOMATZU, H.; SAITO, H.; OKADA, S.; TANAKA, M.; EGASHIRA, M.; HANDA, T.Metal Clip U Shape PVC Edge Trim Seal Helmet Edging Trim-dried small liposomes in the presence of maltose. Chem. Phys. Lipids,Amsterdam, v.113, p.29-39, 2001.[Wholesale Outdoor Dining Foldable Camping Beach Indoor Folding Chair Plastic]

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LOPES, L.B.;Plastic Pipe (PAP) Pipe for Hot and Cold Water and Heating, 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.[Pt100 Sensor]

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NEW, R.R.C.Liposomes:a practical approach.Oxford: IRL Press, 1997. p. 33-161.[Horizontal Wire Rope Hand Winch with Cable / Strap]

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RODANTE, F.; VECHIO, S.; TOMASSETTI, M. Multi-step decomposition processes for some antibiotics: a kinetic study.Thermochim. Acta, Amsterdam, v.394, p.7-18, 2002.[Avonflow White Bathroom Clothes Drying Rack Electric Heater]

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

Athen Grey Marble Slab and Tile for Wall CladdingCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Ultra-Rugged Pet Beds Orthopedic Dog Bed for Breeds Medium to Large
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