scholarly journals Effect of Film Coating on Xanthan Gum Solution-induced Delays in the Disintegration and Dissolution of Tablets

2019 ◽  
Vol 45 (4) ◽  
pp. 182-194
Author(s):  
Rei Ebata ◽  
Yoshiaki Fujita ◽  
Akihiro Nakamura ◽  
Tsutomu Harada
Keyword(s):  
Xanthan Gum ◽  
Film Coating ◽  
Xanthan Gum Solution

Analytical Model for the Deformation of Viscoelastic Non-Newtonian Drops Undergoing Secondary Atomization

2016 ◽  
Author(s):  
Sharon E. Snyder ◽  
Varun Kulkarni ◽  
Paul E. Sojka
Keyword(s):  
Analytical Model ◽  
Xanthan Gum ◽  
Experimental Results ◽  
Analytical Models ◽  
Drop Diameter ◽  
Droplet Deformation ◽  
Secondary Atomization ◽  
Starting Point ◽  
Breakup Model ◽  
Xanthan Gum Solution

While there is no single analytical model that accurately predicts all stages and modes of secondary atomization, many groups have developed models that predict deformation and oscillation of a single, isolated drop. The TAB (Taylor Analogy Breakup) model was chosen for this investigation, mainly due to its widespread use by Liu and Reitz [1], Hwang et al. [2], Tanner [3], and Lee and Reitz [4], among others. Since the TAB model is also the foundation for many other analytical models, it will also be used here as a starting point for the development of a viscoelastic non-Newtonian model to predict droplet deformed radii, droplet deformation time, and velocity at deformation time for viscoelastic xanthan gum - DI water solutions. Three additional improvements are made to this viscoelastic TAB model: the first is a change to a TAB coefficient; the second to the equation for the drag coefficient, and the third modification is to the breakup criterion. This model uses Carreau rheology and Zimm relaxation time. Non-dimensional drop diameter and initiation times are plotted against We; model results are compared to experimental results for a range of xanthan gum solution concentrations. Results show fair agreement between experimental results and model results for non-dimensional drop diameter, with the best match at low XG concentration and low-to-medium We (10–30). It was also noted that increased viscoelasticity seems to increase this drop diameter. Good agreement between experimental data and model results has been seen for initiation time, with increased viscoelasticity increasing this parameter as well.

A pair of bubbles’ rising dynamics in a xanthan gum solution: a CFD study

RSC Advances ◽  
2015 ◽  
Vol 5 (11) ◽  
pp. 7819-7831 ◽  
Author(s):  
Md. Tariqul Islam ◽  
P. Ganesan ◽  
Ji Cheng
Keyword(s):  
Rheological Properties ◽  
Newtonian Fluid ◽  
Xanthan Gum ◽  
Volume Of Fluid ◽  
Volume Of Fluid Method ◽  
Xanthan Gum Solution

The motion and interaction of a bubble pair in a non-Newtonian fluid are numerically simulated by a volume of fluid method. The effects of initial horizontal bubble interval, oblique alignment and fluid rheological properties on the pair of rising bubbles are evaluated.

Administration in suspension-form of n-alkane external markers for dry matter intake and diet selection studies

1996 ◽  
Vol 126 (2) ◽  
pp. 207-210 ◽  
Author(s):  
J. P. Marais ◽  
D. L. Figenschou ◽  
P. L. Escott-Watson ◽  
L. N. Webber
Keyword(s):  
Xanthan Gum ◽  
Dry Matter ◽  
Diet Selection ◽  
Dry Matter Intake ◽  
Rotary Evaporator ◽  
Coefficients Of Variation ◽  
Significant Difference ◽  
Xanthan Gum Solution

SUMMARYMilled grass particles were coated with n-alkanes and suspended in a xanthan gum solution. Experiments snowed that grass particles could be coated uniformly with alkanes by means of a rotary evaporator. Further experiments showed that the grass particles, in stable xanthan gum suspension, could be accurately dispensed. The coefficients of variation of the alkane content per dose delivered by means of a dosing gun and syringe were 2·6 and 2·3%, respectively. There was no significant difference between the concentration of faecal alkanes derived from alkanes dosed in suspension-form and alkanes placed directly into the rumen.

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