Abstract
An enhanced method was proposed for controlled release of core material using a coating layer of fine permeable particles dispersed in an impermeable wax prepared by dry-based process. A mathematical model was constructed to describe in detail the core material release by diffusion through the connected permeable particles inside the coating layer. The effective diffusivity was simulated by a random walk method taking into account the structure of the coating layer. The released characteristics were measured for the urea core particle coated with the layer of the starch permeable particles dispersed in the paraffin wax. The calculated results were in a good quantitative agreement with experimental data in all range of coating conditions. As a result, the low release rate was proven to be obtained with thicker coating layer of lower volume fraction of permeable particles. Moreover, the application of permeable particles instead of soluble ones [J. Chem. Eng. Jpn. 35 (2002) 40] resulted in significant decrease in release rate.
| Original language | English |
|---|---|
| Pages (from-to) | 361-368 |
| Number of pages | 8 |
| Journal | Journal of Controlled Release |
| Volume | 92 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Oct 30 2003 |
| Externally published | Yes |
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Keywords
- Coating layer
- Controlled release
- Mathematical model
- Permeable particles
- Random walk simulation
ASJC Scopus subject areas
- Pharmaceutical Science
Cite this
Controlled release with coating layer of permeable particles. / Ito, Ryusei; Golman, Boris; Shinohara, Kunio.
In: Journal of Controlled Release, Vol. 92, No. 3, 30.10.2003, p. 361-368.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Controlled release with coating layer of permeable particles
AU - Ito, Ryusei
AU - Golman, Boris
AU - Shinohara, Kunio
PY - 2003/10/30
Y1 - 2003/10/30
N2 - An enhanced method was proposed for controlled release of core material using a coating layer of fine permeable particles dispersed in an impermeable wax prepared by dry-based process. A mathematical model was constructed to describe in detail the core material release by diffusion through the connected permeable particles inside the coating layer. The effective diffusivity was simulated by a random walk method taking into account the structure of the coating layer. The released characteristics were measured for the urea core particle coated with the layer of the starch permeable particles dispersed in the paraffin wax. The calculated results were in a good quantitative agreement with experimental data in all range of coating conditions. As a result, the low release rate was proven to be obtained with thicker coating layer of lower volume fraction of permeable particles. Moreover, the application of permeable particles instead of soluble ones [J. Chem. Eng. Jpn. 35 (2002) 40] resulted in significant decrease in release rate.
AB - An enhanced method was proposed for controlled release of core material using a coating layer of fine permeable particles dispersed in an impermeable wax prepared by dry-based process. A mathematical model was constructed to describe in detail the core material release by diffusion through the connected permeable particles inside the coating layer. The effective diffusivity was simulated by a random walk method taking into account the structure of the coating layer. The released characteristics were measured for the urea core particle coated with the layer of the starch permeable particles dispersed in the paraffin wax. The calculated results were in a good quantitative agreement with experimental data in all range of coating conditions. As a result, the low release rate was proven to be obtained with thicker coating layer of lower volume fraction of permeable particles. Moreover, the application of permeable particles instead of soluble ones [J. Chem. Eng. Jpn. 35 (2002) 40] resulted in significant decrease in release rate.
KW - Coating layer
KW - Controlled release
KW - Mathematical model
KW - Permeable particles
KW - Random walk simulation
UR - http://www.scopus.com/inward/record.url?scp=1642347971&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=1642347971&partnerID=8YFLogxK
U2 - 10.1016/S0168-3659(03)00363-8
DO - 10.1016/S0168-3659(03)00363-8
M3 - Article
C2 - 14568416
AN - SCOPUS:1642347971
VL - 92
SP - 361
EP - 368
JO - Journal of Controlled Release
JF - Journal of Controlled Release
SN - 0168-3659
IS - 3
ER -