Encapsulation of R. planticola Rs-2 from alginate-starch-bentonite and its controlled release and swelling behavior under simulated soil conditions |
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Authors: | Zhansheng Wu Lina Guo Shaohua Qin Chun Li |
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Institution: | (1) School of Life Science, Beijing Institute of Technology, South Zhongguancun Street, Haidian District, Beijing, 100081, People’s Republic of China;(2) Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi, 832003, People’s Republic of China; |
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Abstract: | The plant growth-promoting bacteria (PGPR) Raoultella planticola Rs-2 was encapsulated with the various blends of alginate, starch, and bentonite for development of controlled-release formulations.
The stability and release characteristics of these different capsule formulations were evaluated. The entrapment efficiency
of Rs-2 in the beads (capsules) was more than 99%. The diameter of dry beads ranged from 0.98 to 1.41 mm. The bacteria release
efficiency, swelling ratio, and biodegradability of the different bead formulations were enhanced by increasing the starch
or alginate contents, but were impeded by higher bentonite content. The release kinetics of viable cells from capsules and
the swelling ratio of capsules were studied in simulated soil media of varying temperature, moisture, pH, and salt content.
The release of loaded Rs-2 cells and swelling of capsules are greatly affected by moisture, temperature, pH and salt content
of the release medium. The release of viable Rs-2 cells from capsules was positively associated with the swelling properties
of the capsules. The release of Rs-2 cells occurred through a Case II diffusion mechanism. In summary, this work indicates
that alginate-starch-bentonite blends are a viable option for the development of efficient controlled-release formulations
of Rs-2 biofertilizer, and which could have a promising application in natural field conditions. |
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