title: Dissolution properties and physical characterization of telmisartan-chitosan solid dispersions prepared by mechanochemical activation.
abstract: Solid dispersion systems of telmisartan (a poorly water-soluble antihypertension drug) with biopolymer carrier chitosan have been investigated in this study. The mechanism of solubilization of chitosan for drug has been studied. In addition, the influence of several factors was carefully examined, including the preparation methods, the drug/carrier weight ratios, and the milling time. Drug dissolution and physical characterization of different binary systems were studied by in vitro dissolution test, particle size distribution, Fourier transform infrared spectroscopy, differential scanning calorimetry, powder X-ray diffractometry, and scanning electron microscopy. The results presented that the weak basic property of chitosan appeared as the main driving force for the drug dissolution enhancement. Other effects such as decreased drug crystallinity and size played a positive contributory role. Among the preparation methods, cogrinding was the best method showing strong drug amorphization, reduced particle size, and enhanced dissolution. The drug dissolution markedly improved with increasing the amount of chitosan in solid mixtures. As a result, a significant effect of chitosan increasing telmisartan dissolution has been demonstrated, and cogrinding in a roll ball mill was the best way to prepare solid dispersions, which had high degree of uniformity in drug content and had a practical application in manufacturing.
authors: Key Laboratory for Green Pharmaceutical Technologies and Related Equipment of Ministry of Education, College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China.
authors: Lin
authors: L
authors: Zhong
authors: Xingyi
authors: X
authors: Zhu
authors: Xiaofang
authors: X
authors: Luo
authors: Weike
authors: W
authors: Su
mesh_terms: D047228:Angiotensin II Type 1 Receptor Blockers / Q000737:chemistry*; D000959:Antihypertensive Agents / Q000737:chemistry*; D001562:Benzimidazoles / Q000737:chemistry*; D001565:Benzoates / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D002626:Chemistry, Pharmaceutical; D048271:Chitosan / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D004337:Drug Carriers; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D033362:Powder Diffraction; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013678:Technology, Pharmaceutical / Q000379:methods*; D000077333:Telmisartan
chemical_list: D047228:Angiotensin II Type 1 Receptor Blockers; D000959:Antihypertensive Agents; D001562:Benzimidazoles; D001565:Benzoates; D004337:Drug Carriers; D048271:Chitosan; D000077333:Telmisartan