Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9678318 | Colloids and Surfaces B: Biointerfaces | 2005 | 8 Pages |
Abstract
A novel capsule system composed of sodium cellulose sulfate (NaCS), carboxymethyl cellulose (CMC) and poly[dimethyl(diallyl)ammonium chloride] (PDMDAAC) was prepared for improving the properties of NaCS/PDMDAAC capsules. The process parameters, such as CMC concentration (0, 2, 4, 6 and 8Â g/L), NaCS concentration (20, 25, 30, 35 and 40Â g/L), PDMDAAC concentration (20, 30, 40, 50, 60, 70 and 80Â g/L), reaction time and temperature were investigated to understand their effects on the diameter, membrane thickness and mechanical strength of capsules. The optimum operation conditions for preparing NaCS-CMC/PDMDAAC capsules were determined as 6-8Â g/L CMC, 35-40Â g/L NaCS, 60Â g/L PDMDAAC and polymerization for 30-40Â min. Diffusion of substances with low molecular weight into capsules was investigated, and diffusion coefficients were calculated according to the developed model. The yeast of Candida krusei was chosen as representative cell to evaluate the effects of different cell loading on capsule mechanical strength. Meanwhile the encapsulated osmophilic C. krusei cells were cultured in 250Â mL shaking flasks for 72Â h to determine the cell leaking properties in short and long term.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
Guo Chen, Shan-jing Yao, Yi-xin Guan, Dong-qiang Lin,