scholarly journals Dissolution test optimization for meloxicam in the tablet pharmaceutical form

2009 ◽  
Vol 45 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Érika de Fátima Silva Oliveira ◽  
Roberta de Cássia Pimentel Azevedo ◽  
Rudy Bonfilio ◽  
Diego Borges de Oliveira ◽  
Gislaine Pereira Ribeiro ◽  
...  
Keyword(s):  
Reference Product ◽  
Dissolution Test ◽  
Dissolution Medium ◽  
First Order ◽  
Pharmaceutical Form ◽  
Precision And Accuracy ◽  
Dissolution Efficiency ◽  
Test Optimization ◽  
B Test ◽  
Kinetics Of

Meloxicam is a broadly used drug in the therapeutics for the osteoarthritis and rheumatoid arthritis treatments in adults, and it is available in the Brazilian market, as tablet and capsule pharmaceutical forms. The present work aimed to establish conditions for accomplishment of the dissolution test of 15 mg meloxicam tablets (A and B test products), compared with the reference product, since there is no monograph about dissolution assays for meloxicam in official summaries. To optimize the conditions several parameters were tested and, according to obtained results, the use of pH 7.5 phosphate buffer (900mL, at 37 ± 0.5ºC) as dissolution medium, paddle method (apparatus 2), stirring speed of the dissolution medium at 100 rpm and collect time of 60 minutes were considered satisfactory. The samples were quantified by UV spectrophotometric method at 362 nm. The products presented kinetics of first-order. Dissolution efficiency values were of 83.25, 83.73 and 88.10% for the A, B and reference products, respectively. Factors f1 and f2 were calculated and similarity of the tested medicines was demonstrated. The dissolution test was validated presenting selectivity, linearity, precision and accuracy within of the acceptance criteria.

scholarly journals Comparative studies of the kinetics of dissolution of medicines on the basis of clopidogrel

2021 ◽  
pp. 26-34
Author(s):  
O. P. Baula ◽  
O. O. Saliy ◽  
V. I. Bessаrabov ◽  
A. М. Gerasimchuk
Keyword(s):  
Comparative Studies ◽  
Generic Drugs ◽  
Dissolution Kinetics ◽  
Dissolution Test ◽  
Generic Medicines ◽  
Dissolution Medium ◽  
Clopidogrel Bisulfate ◽  
Kinetics Of Dissolution ◽  
Kinetics Of

Generic medicines occupy dominant positions both in the pharmaceutical market of Ukraine and in industrial production by domestic pharmaceutical enterprises. The use of generic drugs in medical practice is of significant medical and social importance for expanding the accessibility of the general population to essential drugs. In Ukraine, more than twenty generic medicines based on clopidogrel, both foreign and domestic, are registered. All generic drugs containing clopidogrel bisulfate must comply with pharmaceutical bisulfate must comply with pharmaceutical equivalence, the kinetics of release of the active pharmaceutical ingredient using the Dissolution test in vitro, and pharmacokinetic parameters in vivo. The aim of the work was to carry out comparative studies of the dissolution kinetics of four samples of generic drugs based on clopidogrel with the dissolution kinetics of the original drug Plavix®, to evaluate the similarity factor of dissolution profiles and to determine the effect of biopharmaceutical factors on the equivalence of generics. Comparative studies of the kinetics of dissolution were carried out by the in vitro method according to the «Dissolution» test using a device with a blade with a rotation speed of 50 rpm, a dissolution medium with a pH value of 2.0 in a volume of 900 ml at a temperature of 37 ± 1 °C. The determination of the quantitative content of clopidogrel, which passed into the dissolution medium, was carried out by the method of adsorption spectrophotometry in the ultraviolet region at a wavelength of about 240 ± 2 nm. Based on the data obtained, the dissolution profiles of the original drug Plavix® and the studied samples of generic drugs were constructed, the similarity of which was assessed by the value of the similarity factor. According to the research results, it was found that one sample of the generic drug proved its equivalence by the in vitro method to Plavix®, and three other samples of generics had differences in dissolution kinetics in comparison with the original drug. Biopharmaceutical factors were analyzed that could affect the dissolution kinetics of the studied generic drugs, from which the physicochemical characteristics of clopidogrel bisulfate, the qualitative and quantitative composition of excipients and the features of the technological process were determined. Thus, on the basis of the comparative studies of the dissolution kinetics of drugs based on clopidogrel, generics were found that did not correspond to the in vitro equivalence according to the Dissolution test to the original drug, which could be due to the influence of a combination of biopharmaceutical factors.

scholarly journals Development of a dissolution test for lamotrigine in tablet form using an ultraviolet method

2010 ◽  
Vol 46 (2) ◽  
pp. 179-186 ◽  
Author(s):  
Magda Targa Martins ◽  
Clésio Soldatelli Paim ◽  
Martin Steppe
Keyword(s):  
Hydrochloric Acid ◽  
Reference Product ◽  
Single Point ◽  
Analysis Procedure ◽  
Dissolution Profile ◽  
Dissolution Test ◽  
Dissolution Medium ◽  
Tablet Form

A dissolution test for tablets containing 100 mg of lamotrigine was developed and validated. The dissolution test was applied to compare the dissolution profile of Neural® with the reference product Lamictal®. The analysis procedure was carried out using a simple ultraviolet method at 267 nm. After the determination of solubility and sink conditions, the parameters selected were paddles at 50 rpm, 900 mL of 0.01 M hydrochloric acid, and 30 minutes duration (single point). This method was validated for specificity, linearity, accuracy, precision and robustness. Lamotrigine stability was also evaluated in dissolution medium.

scholarly journals Design of Experiments for the Establishment of the Dissolution Test Conditions of Rupatadine Fumarate 10 mg tablets

2019 ◽  
Vol 9 (1-s) ◽  
pp. 331-336 ◽  
Author(s):  
Castillo Henríquez Luis ◽  
Madrigal Redondo German ◽  
Vargas Zúñiga Rolando ◽  
Carazo Berrocal Gustavo
Keyword(s):  
Design Of Experiments ◽  
Statistical Model ◽  
Rotation Speed ◽  
Dissolution Test ◽  
Dissolution Medium ◽  
Independent Variables ◽  
Test Conditions ◽  
Pharmaceutical Technology ◽  
Dependent Variables ◽  
Pharmaceutical Form

Design of Experiments (DoE) is a statistical model that aims to determine if the factors under study affect the response, and if so, it determines the conditions under which this variable of interest can be optimized. In terms of pharmaceutical technology, independent variables are usually factors of the formulation, while dependent variables are properties of the product or parameters that indicate the performance of the process. Precisely, the dissolution test is a tool of interest for the developers of medicines since it allows them to evaluate the performance of a formulation designed in a solid pharmaceutical form, such as tablets. The present investigation used the design of experiments to establish and optimize the conditions of the dissolution test of a 10 mg Rupatadine fumarate tablets formulation, resulting in the use of HCl 0,1 N (pH 1) dissolution medium and a rotation speed of 100 rpm for the apparatus II USP, which allow the analysis of the product in a reproducible and reliable way. Keywords: Analysis of variances, Design of experiments, Dissolution test, Factorial design, Rupatadine Fumarate, Tablets, Test conditions.

Kinetic of oxidation of methyl orange by vanadium(V) under conditions VO2+ and decavanadates coexist: Catalysis by Triton X-100 micellar medium

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Methyl Orange ◽  
Solution Ph ◽  
Vanadium Concentration ◽  
Limiting Behavior ◽  
First Order ◽  
First Order Kinetics ◽  
Ph Range ◽  
Kinetic Pattern ◽  
Triton X ◽  
Kinetics Of

The kinetics of oxidation of methyl orange by vanadium(V) {V(V)} has been investigated in the pH range 2.3-3.79. In this pH range V(V) exists both in the form of decavanadates and VO2+. The kinetic results are distinctly different from the results obtained for the same reaction in highly acidic solution (pH < 1) where V(V) exists only in the form of VO2+. The reaction obeys first order kinetics with respect to methyl orange but the rate has very little dependence on total vanadium concentration. The reaction is accelerated by H+ ion but the dependence of rate on [H+] is less than that corresponding to first order dependence. The equilibrium between decavanadates and VO2+ explains the different kinetic pattern observed in this pH range. The reaction is markedly accelerated by Triton X-100 micelles. The rate-[surfactant] profile shows a limiting behavior indicative of a unimolecular pathway in the micellar pseudophase.

The Kinetics of Glucose Decomposition with Sulfate Reduction in the Anaerobic Fluidized Bed Reactor

1993 ◽  
Vol 28 (2) ◽  
pp. 135-144 ◽  
Author(s):  
S. Matsui ◽  
R. Ikemoto Yamamoto ◽  
Y. Tsuchiya ◽  
B. Inanc
Keyword(s):  
Sulfate Reduction ◽  
Fluidized Bed ◽  
Kinetic Equations ◽  
Fluidized Bed Reactor ◽  
Order Reaction ◽  
First Order Reaction ◽  
First Order ◽  
Glucose Decomposition ◽  
Reaction Equations ◽  
Kinetics Of

Using a fluidized bed reactor, experiments on glucose decomposition with and without sulfate reduction were conducted. Glucose in the reactor was mainly decomposed into lactate and ethanol. Lactate was mainly decomposed into propionate and acetate, while ethanol was decomposed into propionate, acetate, and hydrogen. Sulfate reduction was not involved in the decomposition of glucose, lactate, and ethanol, but was related to propionate and acetate decomposition. The stepwise reactions were modeled using either a Monod expression or first order reaction kinetics in respect to the reactions. The coefficients of the kinetic equations were determined experimentally. The modified Monod and first order reaction equations were effective at predicting concentrations of glucose, lactate, ethanol, propionate, acetate, and sulfate along the beight of the reactor. With sulfate reduction, propionate was decomposed into acetate, while without sulfate reduction, accumulation of propionate was observed in the reactor. Sulfate reduction accelerated propionate conversion into acetate by decreasing the hydrogen concentration.

Submerged upflow biotower operation and computer simulation

1994 ◽  
Vol 30 (11) ◽  
pp. 143-146
Author(s):  
Ronald D. Neufeld ◽  
Christopher A. Badali ◽  
Dennis Powers ◽  
Christopher Carson
Keyword(s):  
Computer Simulation ◽  
Benzoic Acid ◽  
Computer Model ◽  
Rate Constants ◽  
Batch Mode ◽  
Operational Conditions ◽  
First Order ◽  
Low Concentrations ◽  
Biological Transformation ◽  
Kinetics Of

A two step operation is proposed for the biodegradation of low concentrations (< 10 mg/L) of BETX substances in an up flow submerged biotower configuration. Step 1 involves growth of a lush biofilm using benzoic acid in a batch mode. Step 2 involves a longer term biological transformation of BETX. Kinetics of biotransformations are modeled using first order assumptions, with rate constants being a function of benzoic acid dosages used in Step 1. A calibrated computer model is developed and presented to predict the degree of transformation and biomass level throughout the tower under a variety of inlet and design operational conditions.

Iodoacetate inactivation of rape alcohol dehydrogenase

1980 ◽  
Vol 45 (5) ◽  
pp. 1601-1607 ◽  
Author(s):  
Marie Stiborová ◽  
Sylva Leblová
Keyword(s):  
Alcohol Dehydrogenase ◽  
Protein Molecule ◽  
Sulfhydryl Groups ◽  
Inactivation Rate ◽  
First Order ◽  
Ph Dependent ◽  
Kinetics Of

Iodoacetate inactivates rape alcohol dehydrogenase (ADH, EC 1.1.1.1). The inactivation rate follows the kinetics of the first order, is pH-dependent, and decreases below pH 7.5. Besides irreversible alkylation of the sulfhydryl groups of the enzyme iodoacetate also forms a reversible complex with rape ADH. The coenzyme (NAD) and its analogs (ATP, ADP, AMP) competitively protect the enzyme against alkylation; o-phenanthroline also protects the enzyme against alkylation yet noncompetitively with respect to iodoacetate. Imidazole and o-phenanthroline compete with one another for binding to the protein molecule of rape ADH. Whereas o-phenanthroline decreases the inactivation rate imidazole increases the rate of iodoacetate inactivation.

Kinetics of catalytic reduction of nitrogen oxide by carbon monoxide on CuO/Al2O3 catalyst

1983 ◽  
Vol 48 (11) ◽  
pp. 3202-3208 ◽  
Author(s):  
Zdeněk Musil ◽  
Vladimír Pour
Keyword(s):  
Carbon Monoxide ◽  
Nitrogen Oxide ◽  
Rate Equation ◽  
Catalytic Reduction ◽  
Zero Order ◽  
Spectroscopic Measurements ◽  
First Order ◽  
Ir Spectroscopic ◽  
Kinetics Of ◽  
Al2o3 Catalyst

The kinetics of the reduction of nitrogen oxide by carbon monoxide on CuO/Al2O3 catalyst (8.36 mass % CuO) were determined at temperatures between 413 and 473 K. The reaction was found to be first order in NO and zero order in CO. The observed kinetics are consistent with a rate equation derived from a mechanism proposed on the basis of IR spectroscopic measurements.

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