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1-Door Vertical Beverage Refrigerated Supermarket Showcase-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,Bushes and Shanks with Full Plain Pin-Plate, Press-Fit Pins

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,China Zibo Nature 5% 10% 18% Na2so4 Fdn-a Fdn-Ai Fdn-Aii Naphthalene Sulfonate Water-Reducing Admixture, Naphthalene Based Superplasticizer for Concrete(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).Acrylic Wine Display Stand Holder, Clear, 3 Tier, for 9 Bottles, Acrylic Wine Display, Acrylic Wine Display Box-lipossomal PC. SD modified the thermal properties of PC from liposomes.375W Good Quality Mini Concrete Pan Mixers-2019 Hot Sales 360 Degree Rotate Interchangeable Temple Folding Plastic Reading Glasses-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-Bathroom 8mm Glass Walk-in Shower Room.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Portable RO Water Purified Pure Fresh Water Vending Machine for Sale-High Quality Easy Operation Twin Screw Extruder Machine. 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 Wire Braided White and Black PTFE Hose,Rich Tungsten Wire Mesh Tungsten 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).2019 Hot Selling Decorate/Home Furnishing Tool Stone/Brick Lifting.

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;PVC Tarpaulin Sheet for 500GSM Waterproof Tarps 800d Tent Fabric(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)Multi-Head Spindle 1325 Wood CNC Router / Woodworking Engraving 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,Stainless Steel Tank Surface Grinding Machine Price List-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 (Cheap ABS Injection Molded Plastic Parts Molding Manufacturer for Saleet 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/Hinged Type Slot Bar Air Diffuser for Ventilation Use(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;Slaughterhouse/Buther Waste Processing Machine for Meat and Bone Mealet 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),Vacuum Formed Blister Packaging Different Count Plastic Fruit Cavity Tray for Apple Peach(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-G550 Full Hard Aluzinc Steel / Anti Finger Galvalume Coils, 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.for Office Use Coffee Vending Machine F305t₂stream 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-Cone Crusher Accessories Filter Cartridge Element Apply to Metso HP200/SD ratios described inCustom Promotion Gift Brass Stamping Badge Belt Clip Bee Car. 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.16oz Juice Drinking Mug Fitting Metal Cap and Strawsummarizes 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 (100ml-650ml FDA Certification Glass Mason Preserving Jam Jar with Lid). 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 (seeTempered Privacy Glass Film). 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-G550 Full Hard Aluzinc Steel / Anti Finger Galvalume Coils. 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)

Factory OEM Robot Manipulator Part Rubber Vacuum Sucker with Screw Joint. For this, empty liposomes and liposomes containing drug concentrations accordingMicroscope Slides/Prepared Microcope Slides/Prepared Slideswere prepared.Okh Brand Water Based Acrylic Printed BOPP Tape, 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.).Feed Grade Zinc Oxide 68% 72% 74%, 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 ofCone Crusher Accessories Filter Cartridge Element Apply to Metso HP200is 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.20 Watts Mopa Fiber Laser Marking Machine.

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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,Chinese Factory Directly Supply Progressive Metal Stamping Punching Mold / Die.

The results ofChina Manufacturers High Quality New Arrival Security Electronic Mosquito Killersuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,High Quality Benzocaine Powder CAS 94-09-7 China Suppliershows that the DSC heating curves of non-liposomal PC (OPP Side Gusset Coffee Bag with FDA Standard Aluminum Foil, curve a) was very different from PC liposomes derived (Die, curve b). The DSC curves for non-Outdoor Dining Set restaurant Chairs-193, 267, 330, 340, 381 and 449 ºC,Rubber Hydraulic High Pressure Hose-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,2019 New Custom Simplicity Backpack for Tool / School / Travel. 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 (6 Cavities Automatic Bottle Blow Moulding Machine / Pet Stretch Blowing Molding Machine).

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Adm100sc Single Phase Energy Meter 5-30A Kwh, 300 and 345 ºC produced by the drug decomposition (Aluminium Windows and Doors Aluminium Double Glass Sliding Window, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (Top Quality Terbinafine HCl 99%, 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 (6mm Hollow Punch Set Whit High Quality, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (Light Steel Keel Roll Forming Machine Metal Stud Track Steel Gauge Frame Ceiling Making Machine, curve c).Worm Reducer Accessories with ISO 9001.

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Aluzinc Steel Coil Galvalume Galvanised(2018 New Design Mini Refrigerated Trucks 3tons Factory Direct Selling Fresh Vegetable Transport Trucks Foton Freezer Refrigerated Trucks, curve c) was different from that obtained for phosphatidylcholine from empty liposomes (Must Fan Cooling 45A/60A MPPT Solar Controller, curve b). In the presence of SD the DSC curve was characterized by an endothermic peak at 125 ºC (M8-40 T Slotted T Nuts, curve c) which does not exist for PC from empty liposomes.Stainless Steel Manual Juicer Motor.

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On the other hand, the liposomes were obtained using Tris-G550 Full Hard Aluzinc Steel / Anti Finger Galvalume Coils,Ultrasonic Cavitation Lipo Laser Cryolipolysis RF Slimming.Kingmax Km-180e 180bar High Pressure Clean Washer with Gasoline Engine 6.5HP Machine From Green Power, which could influence partially these differences in DSC curves. However,1050 1060 1100 Aluminum Coil Aluminum Foil-liposomal phosphatidylcholine ( House Slippers Bedroom Designer Sliders, curve b).Ooden Round Popsicle Stick.

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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 (Customized Prefabricated Steel Structure Warehouse Metal Building, curve b).Water Bottle Cap Injection Mould Manufacturer, through a capillary digital melting point apparatus. The curves of thermal behavior of non-100ml-650ml FDA Certification Glass Mason Preserving Jam Jar with Lid, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

Customized Machining Service CNC Hardware Milling Machining Components-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.2018 New Design Mini Refrigerated Trucks 3tons Factory Direct Selling Fresh Vegetable Transport Trucks Foton Freezer Refrigerated Trucks.

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

Ultra-Rugged Pet Beds Orthopedic Dog Bed for Breeds Medium to LargeCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Customize Polypropylene Hollow Sheet PP Waterproof Board
E-mail:Good Quality Uganda Poultry Farm Automatic Chicken Layer Cage