Formulation, characterization and in vitro evaluation of theophylline-loaded Eudragit RS 100 microspheres prepared by an emulsion-solvent diffusion/evaporation technique

References

• Kim BK, Hwang SJ, Park JB, Park HJ. Preparation and characterization of drug-loaded polymethacrylate microspheres by an emulsion solvent evaporation method. J Microencapsul 2002;19:811–822.
   PubMed Web of Science ®Google Scholar
• Li M, Rouad O, Poncelet D. Microencapsulation by solvent evaporation: State of the art for process engineering approaches. Int J Pharm 2008;363:26–39.
   PubMed Web of Science ®Google Scholar
• Ford JL. The current status of solid dispersions. Pharm Acta Helv 86;61:69–88.
   Google Scholar
• Hasegawa A, Kawamura R, Nakagawa H, Sugimoto I. Application of solid dispersions with enteric coating agents to overcome some pharmaceutical problems. Chem Pharm Bull 1986;4:2183–2190.
   Google Scholar
• Lehmann K. Chemistry and application properties of polymethacrylate coating systems In: McGinity JW, editor. Aqueous polymeric coating for pharmaceutical dosage forms. New York: Marcel Dekker; 1989:153–245.
   Google Scholar
• Vachon MG, Nairn JG. Physicochemical evaluation of acetylsalicylic acid-Eudragit RS 100 microspheres prepared using a solvent partition method. J Microencapsul 1995;12:287–305.
   PubMed Web of Science ®Google Scholar
• Haznedar S, Dortunc B. Preparation and in vitro evaluation of Eudragit microspheres containing acetazolamide. Int J Pharm 2004;269:131–140.
   PubMed Web of Science ®Google Scholar
• Fatome M, Courteille F, Laval JD, Roman V. Radioprotective activity of ethylcellulose microspheres containing WR 272, after oral administration. Int J Pharm 2987;52:21–29.
   Google Scholar
• Stallmann HP, Faber C, Bronckers AL, Amerongen AVN,Wuisman PI. In vitro gentamicin release from commercially available calcium-phosphate bone substitutes influence of carrier type on duration of the release profile BMC. Musculoskelet Disord 2006;7:18.
   PubMed Web of Science ®Google Scholar
• Mestiri M, Puisieux F, Benoit JP. Preparation and characterization of cisplatin-loaded polymethyl methacrylate microspheres. Int J Pharm 1993;89:229–234.
   Web of Science ®Google Scholar
• Hamishekar H, Emami J, Najafabadi AR, Gilani K, Minaiyan M, Mahdavai H, Nokhodchi A. Particle size design of PLGA microspheres for pulmonary drug delivery: Mathematical modeling and statistical optimization using response surface methodology. J Microencapsul 2009;26:1–8.
   PubMedGoogle Scholar
• Miyazaki Y, Yakou S, Nagai T, Takayama, K. Release profiles of theophylline from microspheres consisting of dextran derivatives and cellulose acetate butyrate: Effect of polyion complex formation. Drug Dev Ind Pharm 2003;29:795–804.
   PubMed Web of Science ®Google Scholar
• Obaidat WM, Obaidat IM. Effect of the dispersion of Eudragit S100 powder on the properties of cellulose acetate butyrate microspheres containing theophylline made by the emulsion-solvent evaporation method. J Microencap 2007;24:263–273.
   PubMed Web of Science ®Google Scholar
• Obaidat WM, Price JC. Preparation and evaluation of eudragite S100 microspheres as pH-sensitive release preparation for piroxicam and theophylline using the emulsionsolvent evaporation method. J Microencap 2006;23:195–202.
   PubMed Web of Science ®Google Scholar
• Subhaga CS, Ravi KG, Sunny MC, Jayakrishnan SA. Evaluation of an aliphatic polyurethane as a microsphere matrix for sustained theophylline delivery. J Microencap 1995;12:617–625.
   PubMed Web of Science ®Google Scholar
• Türk CT, Hasçiçek C, Gönül N. Evaluation of drug-polymer interaction in polymeric microspheres containing diltiazem hydrochloride. J Therm Analys Calori 2009;95:865–869.
   Web of Science ®Google Scholar
• Goto S, Kawata M, Nakamura M, Maekauwa K, Ayoam AT. Eudragit RS and RL (acrylic esins) microcapsules as pH insensitive and sustained release preparations of ketoprofen. J Microencapsul 1986;293–304.
   PubMedGoogle Scholar
• Goto S, Kawata M, Nakamura M, Maekauwa K, Ayoam AT. Eudragit E, L and S (acrylic resins) microcapsules as pH sensitive release preparations of ketoprofen. J Microencapsul 1986;3:305–316.
   PubMedGoogle Scholar
• Kawata M, Nakamura M, Goto S, Aoyama, T. Preparation and dissolution pattern of Eudragit RS microcapsules containing ketoprofen. Chem Pharm Bull 1986;34:2618–2623.
   PubMed Web of Science ®Google Scholar
• Yuksel N, Kanik AE, Baykara T. Preparation of polymeric microspheres by the solvent evaporation method using sucrose stearate as droplet stabilizer. J Microencapsul 1997;4:725–733.
   Google Scholar
• Bogataj M, Mrhar A, Kristl A, Kozjek F. Eudragit E microspheres containing bacampicillin: Preparation by solvent removal methods. J Microencapsul 1991;8:401–406.
   PubMed Web of Science ®Google Scholar
• Thies C. Formation of degradable drug-loaded microparticles by in-liquid drying processes In: Donbrow M, editor. Microcapsules and nanoparticles in medicine and pharmacy. London: CRC Press; 1992:47–71.
   Google Scholar
• Kim CK, Kim MJ, Oh KH. Preparation and evaluation of sustained release microspheres of terbutaline sulfate. Int J Pharm 1994;106:213–219.
   Web of Science ®Google Scholar
• Bhardwaj SB, Shukla AJ, Collins CC. Effect of varying drug loading on particle size distribution and drug release kinetics of verapamil hydrochloride microspheres prepared with cellulose esters. J Microcapsul 1995;12:71–81.
   PubMed Web of Science ®Google Scholar
• Costa P. An alternative method to the evaluation of similarity factor in dissolution testing. Int J Pharm 2001;220:77–83.
   PubMed Web of Science ®Google Scholar
• Varshosaz J, Kennedy RA, Gipps EM. Use of enteric polymers for production of microspheres by extrusion-spheronization. Pharm Acta Helv 1997;72:145–152.
   Google Scholar
• Lin SY, Liao CM, Hsiue GH, Liang RC. Study of a theophylline-Eudragit L mixture using a combined system of microscopic fourier-transform infrared spectroscopy and differential scanning calorimetry. Thermochmica Acta 1995;245:153–166.
   Web of Science ®Google Scholar
• Raffin RP, Colomé Pohlmann AR, Guterrs SS. Preparation, characterization, and in vivo anti-ulcer evaluation of pantoprazole-loaded microparticles. Eur J Pharm Biopharm 2006;63:198–204.
   PubMed Web of Science ®Google Scholar
• Moore, JW, Flanner HH. Mathematical comparison of dissolution profiles. Pharm Technol 1996;20:64–74.
   Google Scholar
• Yuksel N, Kanik AE, Baykara T. Comparison of in vitro dissolution profiles by ANOVA-based, model dependent and independent methods. Int J Pharm 2000;209:57–67.
   PubMed Web of Science ®Google Scholar