scholarly journals Application of an anionic polymer in the formulation of floating tablets containing an alkaline model drug

2017 ◽  
Vol 26 (9) ◽  
pp. 1319-1327
Author(s):  
Dorota Wojcik-Pastuszka ◽  
Iwona Golonka ◽  
Andrzej Drys ◽  
Jobst Mielck ◽  
Maria Twarda ◽  
...  
Keyword(s):  
Anionic Polymer ◽  
Floating Tablets ◽  
Model Drug

scholarly journals Formulation and Evaluation of Biphasic Gastro Floating Tablets of Nateglinide and Atenolol

2020 ◽  
Vol 11 (3) ◽  
pp. 10906-10922
Keyword(s):  
Sustained Release ◽  
Low Cost ◽  
Diffusion Mechanism ◽  
Amorphous State ◽  
Immediate Release ◽  
In Vitro Dissolution ◽  
Fixed Dose ◽  
Floating Tablets ◽  
Model Drug

The aim was to design, formulate, and evaluate bilayer gastro floating tablets of an antidiabetic agent, nateglinide (immediate-release layer), and antihypertensive agent, atenolol (sustained-release layer). The solubility of model drug nateglinide was enhanced by using cremophor RH 40 and characterized by FTIR, DSC, XRD, SEM, and in vitro dissolution. It was found that selected ingredients were compatible, and crystalline nateglinide transits to an amorphous state. The gastro-bilayer tablets were directly compressed using the optimized nateglinide (solid dispersion equivalent to 60 mg of nateglinide) immediate-release layer (IRL2) containing different percentage of F-Melt type C and crospovidone and atenolol (50 mg) sustained-release layer (SRL6) using different percentage of HPMC K15, sodium bicarbonate, and MCC. Developed tablets were evaluated and found within the acceptance range as per the guidelines. The release of nateglinide and atenolol from an optimized bilayer tablet (BLT3) was 100 % within 60 min and 12 h, respectively. The floating lag time and total floating time were 2 min and 12 h, respectively. The atenolol sustained-release followed the diffusion mechanism. The combination of nateglinide and atenolol was successfully showed a biphasic release pattern. This formulation may strengthen the fixed-dose combination therapy for diabetes and hypertension at a low cost.

scholarly journals Design and Characterization of Effervescent Gastro Retentive Floating Tablets by Using Venlafaxine Hcl as a Model Drug

2017 ◽  
Vol 12 (03) ◽  
pp. 01-11
Author(s):  
Asfia Kauser ◽  
Ayesha Haseena ◽  
Faheem Unnisa Begum ◽  
Taiyaba Fatima
Keyword(s):  
Floating Tablets ◽  
Model Drug ◽  
Gastro Retentive

Complex formation of modified chitosan and carboxymethyl cellulose and its effect on paper properties

TAPPI Journal ◽  
2009 ◽  
Vol 8 (6) ◽  
pp. 29-35 ◽  
Author(s):  
PEDRAM FATEHI ◽  
LIYING QIAN ◽  
RATTANA KITITERAKUN ◽  
THIRASAK RIRKSOMBOON ◽  
HUINING XIAO
Keyword(s):  
Carboxymethyl Cellulose ◽  
Polymer System ◽  
Layer By Layer ◽  
Paper Strength ◽  
Anionic Polymer ◽  
Paper Properties ◽  
Modified Chitosan ◽  
Layer By Layer Assembly ◽  
Polyelectrolyte Titration ◽  
Layer Assembly

The application of an oppositely charged dual polymer system is a promising approach to enhance paper strength. In this work, modified chitosan (MCN), a cationic polymer, and carboxymethyl cellulose (CMC), an anionic polymer, were used sequentially to improve paper strength. The adsorption of MCN on cellulose fibers was analyzed via polyelectrolyte titration. The formation of MCN/CMC complex in water and the deposition of this complex on silicon wafers were investigated by means of atomic force microscope and quasi-elastic light scattering techniques. The results showed that paper strength was enhanced slightly with a layer-by-layer assembly of the polymers. However, if the washing stage, which was required for layer-by-layer assembly, was eliminated, the MCN/CMC complex was deposited on fibers more efficiently, and the paper strength was improved more significantly. The significant improvement was attributed to the extra development of fiber bonding, confirmed further by scanning electron microscope observation of the bonding area of fibers treated with or without washing. However, the brightness of papers was somewhat decreased by the deposition of the complex on fibers. Higher paper strength also was achieved using rapid drying rather than air drying.

Controlled Release of Metformin Hydrochloride I. In vitro Release from Physical Mixture Containing Xanthan Gum as Hydrophilic Rate Retarding Polymer

1970 ◽  
Vol 4 (1) ◽  
Author(s):  
Mashkura Ashrafi ◽  
Jakir Ahmed Chowdhury ◽  
Md Selim Reza
Keyword(s):  
Controlled Release ◽  
Xanthan Gum ◽  
In Vitro Release ◽  
Correlation Coefficients ◽  
High Ratio ◽  
Water Soluble ◽  
Metformin Hydrochloride ◽  
Model Drug ◽  
Very High

Capsules of different formulations were prepared by using a hydrophilic polymer, xanthan gum and a filler Ludipress. Metformin hydrochloride, which is an anti-diabetic agent, was used as a model drug here with the aim to formulate sustained release capsules. In the first 6 formulations, metformin hydrochloride and xanthan gum were used in different ratio. Later, Ludipress was added to the formulations in a percentage of 8% to 41%. The total procedure was carried out by physical mixing of the ingredients and filling in capsule shells of size ‘1’. As metformin hydrochloride is a highly water soluble drug, the dissolution test was done in 250 ml distilled water in a thermal shaker (Memmert) with a shaking speed of 50 rpm at 370C &plusmn 0.50C for 6 hours. After the dissolution, the data were treated with different kinetic models. The results found from the graphs and data show that the formulations follow the Higuchian release pattern as they showed correlation coefficients greater than 0.99 and the sustaining effect of the formulations was very high when the xanthan gum was used in a very high ratio with the drug. It was also investigated that the Ludipress extended the sustaining effect of the formulation to some extent. But after a certain period, Ludipress did not show any significant effect as the pores made by the xanthan gum network were already blocked. It is found here that when the metformin hydrochloride and the xanthan gum ratio was 1:1, showed a high percentage of drug release, i.e. 91.80% of drug was released after 6 hours. But With a xanthan gum and metformin hydrochloride ratio of 6:1, a very slow release of the drug was obtained. Only 66.68% of the drug was released after 6 hours. The percent loading in this case was 14%. Again, when Ludipress was used in high ratio, it was found to retard the release rate more prominently. Key words: Metformin Hydrochloride, Xanthan Gum, Controlled release capsule Dhaka Univ. J. Pharm. Sci. Vol.4(1) 2005 The full text is of this article is available at the Dhaka Univ. J. Pharm. Sci. website

Formulation and Evaluation of Microbially- triggered tablets of Valdecoxib

2010 ◽  
Vol 2 (1) ◽  
Author(s):  
Surender Verma ◽  
S. Singh ◽  
D. Mishra ◽  
Atul Gupta ◽  
Rakesh Sharma
Keyword(s):  
Phosphate Buffer ◽  
Guar Gum ◽  
Oral Route ◽  
Matrix Tablets ◽  
In Vitro Dissolution ◽  
Wet Granulation ◽  
Dissolution Study ◽  
Caecal Content ◽  
Model Drug

The objective of present study was to develop colon targeted drug delivery using bacterially triggered approach through oral route. Valdecoxib (COX-2 inhibitor) was chosen as a model drug in order to target it to colon which may prove useful in inflammatory bowel disease and related disorders. Matrix tablets of Valdecoxib were prepared by wet granulation technique utilizing different ratio of Guar gum and Sodium starch glycholate. The prepared matrix tablets were evaluated for uniformity of weight, uniformity of content, hardness and in vitro dissolution study in simulated gastric and intestinal fluid (Phosphate Buffer pH-1.2, pH-6.8 and pH-7.4), followed by Dissolution study in bio-relevant dissolution media Phosphate Buffer (pH-6.8) containing rat caecal content. The results revealed that the formulated batch had released lesser quantity of drug at pH 1.2 and pH 7.4 in 2 hors whereas in biorelevent dissolution media containing rat caecal content it released significantly higher amount of drug which was also significantly higher than the dissolution media of same pH without caecal content (microflora) and it was concluded that guar gum can be used as a potential carrier for targeting drugs to colon.

Preparation and Evaluation of Gemifloxacin Mesylate Floating Matrix Tablets in Healthy Human Volunteers

2017 ◽  
Vol 10 (1) ◽  
pp. 3623-3630
Author(s):  
Bhikshapathi D. V. R. N. ◽  
Haarika B ◽  
Jyothi Sri S ◽  
K Abbulu
Keyword(s):  
Drug Release ◽  
Sodium Bicarbonate ◽  
Polymer Concentration ◽  
Hydroxypropyl Methylcellulose ◽  
Matrix Tablets ◽  
Physical Parameters ◽  
Drug Bioavailability ◽  
Floating Tablets

The purpose of present investigation was to develop floating matrix tablets of gemifloxacin mesylate, which after oral administration could prolong the gastric residence time, increase the drug bioavailability and diminish the side effects of irritating drugs. Tablets containing drug, various viscosity grades of hydroxypropyl methylcellulose such as HPMC K4M and HPMC K15M as matrix forming agent, Sodium bicarbonate as gas-forming agent and different additives were tested for their usefulness in formulating gastric floating tablets by direct compression method. The physical parameters, in vitro buoyancy, release characteristics and in vivo radiographic study were investigated in this study. The gemifloxacin mesylate floating tablets were prepared using HPMC K4M polymer giving more sustained drug release than the tablet containing HPMC K15M. All these formulations showed floating lag time of 30 to 47 sec and total floating time more than 12 h. The drug release was decreased when polymer concentration increases and gas generating agent decreases. Formulation that contains maximum concen-tration of both HPMC K15M and sodium bicarbonate (F9) showing sufficiently sustained with 99.2% of drug release at 12 h. The drug release from optimized formulation follows Higuchi model that indicates the diffusion controlled release. The best formulation (F9) was selected based on in vitro characteristics and used in vivo radiographic studies by incorporating barium sulphate as a radio-opaque agent and the tablet remained in the stomach for about 6 h.   

The Effect of Different Superdisintegrants and their Concentrations on the Dissolution of Topiramate Immediate Release Tablets

2009 ◽  
Vol 2 (2) ◽  
pp. 531-5366
Author(s):  
V A. Vamshi Priya ◽  
G. Chandra Sekhara Rao ◽  
D. Srinivas Reddy ◽  
V. Prabhakar Reddy
Keyword(s):  
Immediate Release ◽  
Drug Dissolution ◽  
Dissolution Profile ◽  
Dissolution Medium ◽  
Lactose Monohydrate ◽  
Sodium Starch Glycolate ◽  
Tablet Disintegration ◽  
Croscarmellose Sodium ◽  
Model Drug ◽  
Usp Apparatus

The purpose of this study was to investigate the efficiency of superdisintegrants: sodium starch glycolate, croscarmellose sodium and crospovidone in promoting tablet disintegration and drug dissolution of Topiramate immediate release tablets. The efficiency of superdisintegrants was tested, by considering four concentrations, viz., like 2%, 3%, 4% and 5% in the formulations. The dissolution was carried out in USP apparatus II at 50 rpm with distilled water as a dissolution medium. The dissolution rate of the model drug topiramate was found highly dependent on the tablet disintegration, on the particle size of the superdisintegrant, on the solubility of the drug and also on the type of superdisintegrant in the dissolution medium. There was no effect of the diluent (Lactose monohydrate) on the disintegration of different concentrations of superdisintegrants. These results suggest that, as determined by the f2 metric (similarity factor), the dissolution profile of the formulation containing 4% sodium starch glycolate and lactose monohydrate as a diluent was similar to that of a marketed product.

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