Retting of Mitsumata Bast by Alkalophilic Bacillus in Papermaking
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概要
- 論文の詳細を見る
An alkalophilic bacterium isolated from soil and designated as strain GIR-277 was found to efficiently macerate bast fibers of mitsumata (Edgeworthia papyrifera Sieb. et Zucc.). The organism identified as a Bacillus sp. was successfully applied to alkaline retting in papermaking. The optimum concentration of alkali (Na2CO3) for this process was 1.0-1.5%, which corresponded to an initial pH of 10.1-10.3. The retting was accomplished within a few days at 30°C. Substantial maceration was ascribed primarily to pectate lyase (EC 4.2.2.2) secreted by the bacterium, and to a lesser extent to the β-eliminative splitting of pectic substances. The overall yield of pulp was about 70%. The strength of the unbeaten pulp resulting from bacterial retting was as higher than that by the conventional soda ash-cooking method. Paper sheets were quite uniform and very soft to touch. It is concluded that bacterial retting under alkaline conditions is a potentially useful process to produce pulp of excellent quality from non-woody pectocellulosic fibers.
- 社団法人 日本農芸化学会の論文
著者
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Kobayashi Yoshinari
Government Industrial Research Institute
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YOSHIHARA KAZUTOSHI
Government Industrial Research Institute
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