Isolation and characterization of alginate-degrading bacteria for disposal of seaweed wastes |
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Authors: | J-C Tang H Taniguchi H Chu Q Zhou S Nagata |
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Institution: | Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education /College of Environmental Science and Engineering, Nankai University, Tianjin, China; Environmental Biochemistry Division, Research Center for Inland Seas, Kobe University, Kobe, Japan |
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Abstract: | Aims: Isolation of novel alginate degrading bacteria for the disposal of seaweed waste in composting process. Methods and Results: Decomposition of alginate polymers was checked by the 3,5-dinitrosalicylic acid (DNS) method for reducing sugar, and absorbance at 235 nm for unsaturated sugar. A bacterium A7 was isolated from wakame compost and confirmed to belong to the genus Gracilibacillus by partial 16S rDNA analysis. The optimum condition for the growth of A7 in a medium containing 5 g l?1 of sodium alginate is as follows: pH, 8·5–9·5; NaCl, 0·5 mol l?1; temperature, 30°C and polypeptone as nutrient content, 2–5 g l?1. In a laboratory-scale composting experiment, the alginate content in wakame compost decreased to 14·3% after 72 h of composting from an initial value of 36%, indicating the effectiveness of alginate decomposition of A7 in wakame composting. Conclusions: The bacterium A7 was found to be alginate lyase-producing in genus Gracilibacillus and effective in degrading alginate to oligosaccharides in wakame during composting process. Significance and Impact of the Study: Development of new methods for the disposal of marine wastes and production of functional products. |
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Keywords: | alginate degradation Gracilibacillus lyase wakane |
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