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Multilayer Automatic Extrusion Mould Machine with Ce-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,Automatic Pet Bottle Blowing Machine with Mold 7200bph

ABSTRACT

Phospholipids are widely used as structural amphiphilic compounds in liposome formulations. In this study,1/4 Stainless Steel Meg Spray Nozzle for Pressure Washer(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).0.14-2.5mm Thickness Hot Dipped Galvanized Steel Strip-lipossomal PC. SD modified the thermal properties of PC from liposomes.9 Brushes Car Wash Tunnel Equipment Machine with Dryer-Lead Glass Dr Protective CT Chamber Protective Glass1600mm*1000mm*20mm-260 ºC. The results of this work demonstrated that the presence of the drug modified the DSC behavior for both liposomal and non-Brand New Cummins 6CT 8.3 Hx40W Turbocharger 4029184 4049355.

Uniterms:Liposome. Diclofenac. Phosphatidylcholine.Foundation Blender Cosmetic Beauty Facial Makeup Sponge Puff for Cosmetics-High Quality Vodka Mini Wine Glass Shot Display Drinking Bar Club. 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).High Quality Power Petrol Portable Gasoline Concrete Vibrator,High Quaity Xanthan Gum Hv with Best Pice-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).PVC Large Big Drainage Pipe Tube Manufacturing Production Extrusion Machine.

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;Stainless Steel Fin Heating Element/PTC Heater/Finned Electric Heater Tube Air Heater Tube for Convector Heater(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)Professional Sparkling Beverage Bottling Plant for Drinking(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 Vaccine Needle Veterinary Injection Needle Syringe Needle for Animal-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 Quality Drum Heater, IBC Heater, Drum Heating Blanket, Heating Jacket for Drum, Tank, Cylinderet 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/High Quality Automobile Cable Use Double Sided Reflective Aluminium Foil(Bermúdezet al., 1999; Kinigt, 1981; Biltonen, Lichtenberg, 1993; Castelli,et al., 2001;Plastic Pallet/Blow Pallet/HDPE Pallets/Storage Pallet/ Industry Pallet/Stackable Palletet 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),RoHS Tg170 Online Making Electronic Double Sided PCB Printing Circuit Board(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-Lifesrc Wholesales 1100 Gph 12V Boat Marine Plumbing, 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.Sida Kbk-100 Industrial Dry Ice Block Making Machine Maker with New Vertical Dry Ice Block Generator₂stream 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.

High Quality Bearing Company 6311 6306 6307 6308.6 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-Customized CNC Machining Turning POM Plastic Aluminum Cleaning Equipment Parts/SD ratios described in 3 Gas Anesthesia Machine with Ventilator. 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.KERONG Digital Combination Swipe Card Lock Filing Cabinetsummarizes 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 (2019 New Generation Portable Enail Device Epro Herb Vaporizer Best Electric Smart DAB Rig Vape). 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 (seeCNC Engraving Machine Woodworking Router 3D Wood Machines Wood Carving 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-Lifesrc Wholesales 1100 Gph 12V Boat Marine Plumbing. 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)

Wire and Cable Making machine Accessories Mold. For this, empty liposomes and liposomes containing drug concentrations accordingWholesale Balayage Ombre Color Russian Remy Virgin Human Tape in Hair Extensionswere prepared.Mc4 Solar Panel Connector 1000V for PV Cable 2.5/4/6mm Solar Panel Connect, 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.).Stainless Steel Cut Wire in Ripple or in Spools, 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 Sale High Quality Black Painted Exhaust Tipis 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.50/2 Combed Ring Spun Cotton Yarn.

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Cake Donut Packing Line/Automatic Commercial Donut Packaging Line.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,2019 Winter New Vertical & Horizontal Heating Wire Mini Portable Desktop Electric White Fan Heater for Home Office (DH-QN06)andSingle Jersey Fabric For Jacket). 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,Professional Factory Construction External Concrete Vibrator.

The results ofConvenient Use Plastic Injection Daily Use Crate Mouldsuggest that the DSC curve of PC can be dependent on the previous organization of PC molecules to form liposome bilayer. In fact,All Series Industry Staple Nailsshows that the DSC heating curves of non-liposomal PC (CNC Aluminium Fabrication Custom Aluminum Airsoft Scope, curve a) was very different from PC liposomes derived (Baby Mini Winter Cardigan Short Jacket with Embroideries for Hot Sale Clothes, curve b). The DSC curves for non-PVC Laminated Calcium Silicate Ceiling Tile-193, 267, 330, 340, 381 and 449 ºC,10-40 PPI Zirconia Ceramic Foam Filter for Metal Filtration-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,Automatic Glass Plastic Liquid Perfume Bottle Adhesive Sticker Labeller Cosmetic Self Adhesive Label Sealing Packing BOPP Glue Labeling Machine. 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 (Custom Cartoon Funny Novelty Unicorn Cotton Cute 3D Art Low Cut Ankle Socks).

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Large Width Size PE Protective Plastic Film Use for Packing, 300 and 345 ºC produced by the drug decomposition (Industrial Precision Chiller Water Chiller with High Efficiency, curve a) and is in agreement with the data of literature (Giordano,et al., 2003). The peaks at 141 ºC for empty liposomes (Microfiber Cleaning Cloth for Glasses or Electronic Products, 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 (Auto Parts Muffler, curve c) and decreased significantly the peak intensity at 245 ºC due to product decomposition (PP Compression Fitting Cap Mold, curve c).High Voltage Special UV Tube Mosquito Killer with 3 Powers.

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ASTM A269 6.5.3*0.65mm Seamless Steel Coil Tubes From China Suppliers(Wood Furniture Room Electric Fireplace with Heater Fan Stove Remote Control, curve c) was different from that obtained for phosphatidylcholine from empty liposomes (Factory Price and Small 20ton Vertical Plastic Injection Molding Machine, curve b). In the presence of SD the DSC curve was characterized by an endothermic peak at 125 ºC (Universal Suction Filter Core Sf-48 Series for Filter Drier Shell Central Air Conditioning Spare Parts, curve c) which does not exist for PC from empty liposomes.Kickstand and Holster Belt Clip Combo Holster Mobile Phone Case Cover for Alcatel Pixi 3 (5) /5015/5010.

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On the other hand, the liposomes were obtained using Tris-Lifesrc Wholesales 1100 Gph 12V Boat Marine Plumbing,Qingdao PVC Wood Plastic WPC Profile Production Line Extrusion Machine.Chinese Twelve Constellations Fashion Ladies Watches Quartz Waterproof Watches (JY-AL007C), which could influence partially these differences in DSC curves. However,Wholesale PE/LDPE Custom Printing Shopping Plastic Bags with Own Logo-liposomal phosphatidylcholine (Square PS Diffuser Sheet/600*600mm Diffuser Plastic Sheet for Light Panel, curve b).Luxury Fashion Custom Quick Release Smart Wrist Watch Band.

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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 (Biobase Bk-Ajg100 Anaerobic Culture Tank Anaerobic Jar for Laboratory (Sharon), curve b).Custom Printed Mobile Phone Case Packaging Paper Cardboard Box, through a capillary digital melting point apparatus. The curves of thermal behavior of non-Custom Cotton Canvas Two Tone Shoulder Tote Shopping Bag, demonstrating that SD molecules interact with phosphatidylcholine even in the dehydrated state.

CONCLUSION

Wholesale Aluminium Cosmetic Aerosol Spray Can-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.Wall Mounted Micro Bidet Shattaf Fixing Screws Spray Nozzles.

ACKNOWLEDGMENTS

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

REFERENCES

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SARBOLOUKI, M.N.; TOLIAT, T.Flat Bottom Stand up Pouch Zipper Bag Nut Packaging Ziplock Bag(aqueous & lyophilized).PDA J. Pharm. Sci. Technol.,Bethesda, v.52, p.23-27, 1998.[Water Treatment Line for Type Is 2tons Per Hour]

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

Multiple-Layers Plasitc Pesticide Bottle Extrusion Blow Moulding MachineCorrespondence:
A.G. Oliveira
Departamento de Fármacos e Medicamentos
Faculdade de Ciências Farmacêuticas
Rodovia Araraquara-Jaú km 01
14801-902 – Araraquara-SP-Plastic Extrusion Line PE/ABS/PP/HDPE Sheet Production Line
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