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The goal of this work was to create and verify a simple reversed phase-high performance liquid chromatography-photodiode array detector-based method for quantifying cinacalcet in rat plasma. Six albino Wistar rats were given cinacalcet orally by oral gavage. Blood was obtained at regular intervals using retro-orbital vein puncture and processed to get plasma. Cinacalcet was extracted from plasma using a 70:30 v/v ethanol:dichloromethane combination, with an 82.80 %-104.08 % recovery rate. The reversed phase-high performance liquid chromatography-photodiode array detector technique was used to determine cinacalcet plasma concentrations. The mobile phase was acetonitrile:0.1 M dipotassium phosphate buffer (pH 6.8) (50:50 v/v) at a flow rate of 1.0 ml/min. 241.0 nm was used as the detecting wavelength. The method's linearity for cinacalcet was proven by a correlation coefficient (R²) of more than 0.9996 and a linear range of 1 µg/ml to 24 µg/ml for cinacalcet. The lower and upper limits of quantification were found to be 1 µg/ml and 24 µg/ml respectively. At the cinacalcets retention time, no interfering peaks were seen. This reversed phase-high performance liquid chromatography-photodiode array detector approach is a straightforward and effective way to determine pharmacokinetic parameters by measuring plasma cinacalcet levels. [ABSTRACT FROM AUTHOR]

A novel stability indicating UV spectrophotometric method for the quantitative determination of cinacalcet hydrochloride, a calcimimetic, in bulk and tablet dosage forms was developed in the present work. The parameters linearity, precision, accuracy, limit of detection and limit of quantitation were studied according to International Conference on Harmonization guidelines. UV spectroscopic determination was carried out at an absorption maximum of 281 nm using methanol as solvent. In the UV spectroscopic method, linearity over the concentration range of cinacalcet hydrochloride was found to be 15-35 μg/mL with a correlation coefficient of 0.9992. Results of the analysis were validated statistically and by recovery studies. Forced degradation studies were conducted under various conditions. The proposed method is simple, rapid, precise and accurate and can be used for the reliable quantitation of cinacalcet hydrochloride in commercial pharmaceutical dosage forms. [ABSTRACT FROM AUTHOR]

Occurrence of angiotensin converting enzyme (ACE) in mammary gland and tongue taste epithelium was demonstrated for the first time. Six times higher ACE activity in lactating mammary gland, than non-lactating mammary gland, suggested pregnancy and lactation hormonal dependent expression of ACE in female mammals. ACE activity was highest in choroid plexus, less in spinal cord and moderate in cerebrum, medulla, cerebellum and pons. Distribution of ACE in different regions of skin, kidney and among other tissues was different. Presence of ACE in adrenal glands, pancreas, bone marrow and thyroid gland indicated functions other than blood pressure homeostasis for this enzyme.