scholarly journals In vitro dissolution test and absorption study of a per oral controlled release dosage form containing pyridoxine hydrochloride or sodium riboflavin phosphate with hydroxypropyl cellulose.

1980 ◽  
Vol 28 (4) ◽  
pp. 1082-1089 ◽  
Author(s):  
YOSHIHARU MACHIDA ◽  
TSUNEJI NAGAI
1981 ◽  
Vol 8 (2) ◽  
pp. 153-156 ◽  
Author(s):  
J.H.G. Jonkman ◽  
R. Schoenmaker ◽  
N. Grimberg ◽  
R.A. De Zeeuw

2018 ◽  
Vol 8 (6-s) ◽  
pp. 265-268
Author(s):  
Manish Kumar ◽  
Shahnwaj Tyagi ◽  
Shailendra Bhatt ◽  
A. Pandurangan ◽  
Vipin Saini ◽  
...  

Efficacy of pharmaceuticals dosage form generally depends on their formulation properties and manufacturing methods, hence it is likely that the quality of dosage form may vary. Renin acts on angiotensinogen to form angiotensin I, which is converted to angiotensin II by angiotensin-converting enzyme (ACE). Angiotensin II, a potent vasoconstrictor increases blood pressure by increasing vasopressin production and aldosterone secretion. Enalaprilat, the active metabolite of enalapril, inhibits ACE, hence decreases levels of angiotensin II resulting in less vasoconstriction and decreased blood pressure. The study was exclusively experimental that used IP and other standard books to check in vitro quality of enalapril maleate tablet using different analytical techniques and procedure. Test for weight variation, hardness, friability, disintegration time, and dissolution were conducted. The dissolution test was performed at pH 6.8 for both the brands of the tablet. Further all the tablets passed weight variation, hardness, friability and disintegration test as per the pharmacopoeial standard. Hence we can conclude that both the brands of tablets are equal and both the brands contain equal quantity of active pharmaceutical ingredient (API). Both the brands having higher and lower costs exert similar action. Keywords: Enalapril maleate, In Vitro, Dissolution test, Enalapril


2018 ◽  
Vol 4 (4) ◽  
pp. 523-531
Author(s):  
Hina Mumtaz ◽  
Muhammad Asim Farooq ◽  
Zainab Batool ◽  
Anam Ahsan ◽  
Ashikujaman Syed

The main purpose of development pharmaceutical dosage form is to find out the in vivo and in vitro behavior of dosage form. This challenge is overcome by implementation of in-vivo and in-vitro correlation. Application of this technique is economical and time saving in dosage form development. It shortens the period of development dosage form as well as improves product quality. IVIVC reduce the experimental study on human because IVIVC involves the in vivo relevant media utilization in vitro specifications. The key goal of IVIVC is to serve as alternate for in vivo bioavailability studies and serve as justification for bio waivers. IVIVC follows the specifications and relevant quality control parameters that lead to improvement in pharmaceutical dosage form development in short period of time. Recently in-vivo in-vitro correlation (IVIVC) has found application to predict the pharmacokinetic behaviour of pharmaceutical preparations. It has emerged as a reliable tool to find the mode of absorption of several dosage forms. It is used to correlate the in-vitro dissolution with in vivo pharmacokinetic profile. IVIVC made use to predict the bioavailability of the drug of particular dosage form. IVIVC is satisfactory for the therapeutic release profile specifications of the formulation. IVIVC model has capability to predict plasma drug concentration from in vitro dissolution media.


Biomolecules ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 635
Author(s):  
Ding Li ◽  
Menglong Wang ◽  
Wen-Liang Song ◽  
Deng-Guang Yu ◽  
Sim Wan Annie Bligh

A side-by-side electrospinning process characterized by a home-made eccentric spinneret was established to produce the Janus beads-on-a-string products. In this study, ketoprofen (KET) and methylene blue (MB) were used as model drugs, which loaded in Janus beads-on-a-string products, in which polyvinylpyrrolidone K90 (PVP K90) and ethyl cellulose (EC) were exploited as the polymer matrices. From SEM images, distinct nanofibers and microparticles in the Janus beads-on-a-string structures could be observed clearly. X-ray diffraction demonstrated that all crystalline drugs loaded in Janus beads-on-a-string products were transferred into the amorphous state. ATR-FTIR revealed that the components of prepared Janus nanostructures were compatibility. In vitro dissolution tests showed that Janus beads-on-a-string products could provide typical double drugs controlled-release profiles, which provided a faster immediate release of MB and a slower sustained release of KET than the electrospun Janus nanofibers. Drug releases from the Janus beads-on-a-string products were controlled through a combination of erosion mechanism (linear MB-PVP sides) and a typical Fickian diffusion mechanism (bead KET-EC sides). This work developed a brand-new approach for the preparation of the Janus beads-on-a-string nanostructures using side-by-side electrospinning, and also provided a fresh idea for double drugs controlled release and the potential combined therapy.


2021 ◽  
Vol 11 (5) ◽  
pp. 13089-13101

In this study, a sustainable HPLC-UV-DAD method was developed and validated for the determination of allopurinol in tablets and optimization of the dissolution test using factorial design. The separation of the analyte from the sample matrix was achieved in 3.01 minutes in a C8 column (4.6 mm X 150 mm X 5 μm), using mobile phase 0.1 mol L-1 HCl (25%) + ethanol (50%) + ultrapure water (25%) by UV detection at 249 nm. The method presented satisfactory analytical parameters of validation (specificity, selectivity, linearity, stability, precision, accuracy, and robustness), showing no matrix effects. The dissolution test was optimized by complete factorial design 23 and, the optimal conditions were: HCl 0.001 mol L-1, apparatus II (paddle) and 75 rpm. The analytical procedures and dissolution tests were applied to allopurinol tablets marketed in Bahia, Brazil, to evaluate the dissolution studies. The pharmaceuticals had similar dissolution profiles and first-order dissolution kinetics. This new and sustainable HPLC-UV-DAD method is friendly to the environment and can be used for the routine pharmaceutical analysis of allopurinol in fixed dosage forms.


2011 ◽  
Vol 65 (1-2) ◽  
pp. 71-81
Author(s):  
Irena Homsek ◽  
Dragica Popadic ◽  
Slobodanka Simic ◽  
Slavica Ristic ◽  
Katarina Vucicevic ◽  
...  

Controlled-release (CR) pharmaceutical formulations offer several advantages over the conventional, immediate release dosage forms of the same drug, including reduced dosing frequency, decreased incidence and/or intensity of adverse effects, greater selectivity of pharmacological activity, reduced drug plasma fluctuation, and better compliance. After a drug product has been registered, and is already on market, minor changes in formulation might be needed. At the same time, the product has to remain effective and safe for patients that could be confirmed via plasma drug concentrations and pharmacokinetic characteristics. It is challenging to predict human absorption and pharmacokinetic characteristics of a drug based on the in vitro dissolution test and the animal pharmacokinetic data. Therefore, the objective of this study was to establish correlation of the pharmacokinetic parameters of carbamazepine (CBZ) CR tablet formulation between the rabbit and the human model, and to establish in vitro in vivo correlation (IVIVC) based on the predicted fractions of absorbed CBZ. Although differences in mean plasma concentration profiles were notified, the data concerning the predicted fraction of drug absorbed were almost superimposable. Accordingly, it can be concluded that rabbits may be representative as an in vivo model for predicting the pharmacokinetics of the CR formulation of CBZ in humans.


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