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2001

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Articles 31 - 35 of 35

Full-Text Articles in Pharmacy and Pharmaceutical Sciences

Analysis Of Loratadine By Potentiometry And Reverse-Phase High Performance Liquid Chromatography, Kian Yong Puen Jan 2001

Analysis Of Loratadine By Potentiometry And Reverse-Phase High Performance Liquid Chromatography, Kian Yong Puen

Student Works (2000-2009)

A non-aqueous titration method was developed to assay Loratadine bulk active and a High Performance Liquid Chromatography (HPLC) method was developed to determine Loratadine's manufacturing impurity. The HPLC method was also suitable for simultaneously assay and related substance determination of Loratadine pharmaceutical preparations. In the tritation method, glacial acetic acid was chosen as an amphiprotic solvent. Loratadine ionised in glacial acetic acid; the conjugated base of acetic acid (Ac·), was then titrated with standardised perchloric acid. The method was validated found to be precise, linear and robust. Reverse-phase HPLC method using a Novapak Cl8 column with a CH3CN: I0mM K2HPO4 …


Stereospecific Pharmacokinetics And Pharmacodynamics Of Beta-Adrenergic Blockers In Humans, Reza Mehvar, Dion R. Brocks Jan 2001

Stereospecific Pharmacokinetics And Pharmacodynamics Of Beta-Adrenergic Blockers In Humans, Reza Mehvar, Dion R. Brocks

Pharmacy Faculty Articles and Research

The beta-blockers comprise a group of drugs that are mostly used to treat cardiovascular disorders such as hypertension, cardiac arrhythmia, or ischemic heart disease. Each of these drugs possesses at least one chiral center, and an inherent high degree of enantioselectivity in binding to the b-adrenergic receptor. For beta-blockers with a single chiral center, the (-) enantiomer possesses much greater affinity for binding to the b-adrenergic receptors than antipode. The enantiomers of some of these drugs possess other effects, such as antagonism at alpha-adrenergic receptors or Class III antiarrhythmic activity. However, these effects generally display a lower level of stereoselectivity …


Receptor Number And Caveolar Co-Localization Determine Receptor Coupling Efficiency To Adenylyl Cyclase, Rennolds S. Ostrom, Caroline Gregorian, Ryan M. Drenan, Yang Xiang, John W. Regan, Paul A. Insel Jan 2001

Receptor Number And Caveolar Co-Localization Determine Receptor Coupling Efficiency To Adenylyl Cyclase, Rennolds S. Ostrom, Caroline Gregorian, Ryan M. Drenan, Yang Xiang, John W. Regan, Paul A. Insel

Pharmacy Faculty Articles and Research

Recent evidence suggests that many signaling molecules localize in microdomains of the plasma membrane, particularly caveolae. In this study, overexpression of adenylyl cyclase was used as a functional probe of G protein-coupled receptor (GPCR) compartmentation. We found that three endogenous receptors in neonatal rat cardiomyocytes couple with different levels of efficiency to the activation of adenylyl cyclase type 6 (AC6), which localizes to caveolin-rich membrane fractions. Overexpression of AC6 enhanced the maximal cAMP response to β1-adrenergic receptor (β1AR)-selective activation 3.7-fold, to β2AR-selective activation only 1.6-fold and to prostaglandin E2 (PGE2) not at all. Therefore, the rank order of efficacy in …


Ecuador: Utilice La Mercadotecnia Comercial Para Aumentar La Sustentabilidad, Frontiers In Reproductive Health Jan 2001

Ecuador: Utilice La Mercadotecnia Comercial Para Aumentar La Sustentabilidad, Frontiers In Reproductive Health

Reproductive Health

Muchas organizaciones no gubernamentales venden anticonceptivos a través de detallistas con el fin de generar ingresos y mejorar el acceso a estos productos. En 1998, el Centro Médico de Orientación y Planificación Familiar (CEMOPLAF) empleó a 25 agentes de ventas en 14 ciudades ecuatorianas; estos agentes vendieron productos, incluyendo métodos anticonceptivos y pruebas de embarazo de uso doméstico. Esos productos se vendieron a farmacias, médicos, otros distribuidores y a puntos de venta no tradicionales. La venta de anticonceptivos fue la principal fuente de ingresos de CEMOPLAF en 1997. Las ventas habían crecido rápidamente en el periodo 1996–97, pero los gerentes …


Chemical Constituents Of Desmos Dumosus, Roxb., Mazdida Sulaiman Jan 2001

Chemical Constituents Of Desmos Dumosus, Roxb., Mazdida Sulaiman

Student Works (2000-2009)

The chemical content of the 'leaves and bark of Des mos dumosus has been carried out in this study. The leaves yielded nine isoquinoline type of alkaloids and two flavones. The isoquinoline alkaloids isolated were pronuciferine 37, stepharine 39, nomuciferine 40, (-) - 3 - hydroxynomuciferine 41, norlirioferine 42, asimilobine 43, liriodenine 44, lysicamine 45 and O - methylmoschatoline 46. The flavones were 5 - hydroxy - 6,7 - dimethoxyflavone 47 and 5 - hydroxy - 7,8 - dimethoxyflavone 48. The same flavones, 47 and 48 and the alkaloids 45 and 46 were also present in the bark of this …