Purification of potato juice discharged in the process of starch production by Euglena
pisciormis
その他（別言語等）
のタイトル
Euglena pisciormisによるデンプン廃液の浄化 著者（英） Yamamoto Shinro, Kato Sueo, Nishimura Tohru,
Mino Yosuke journal or
publication title
Research bulletin of Obihiro University.
Natural science
volume 18
number 1
page range 49‑54
year 1992‑11‑20
URL http://id.nii.ac.jp/1588/00001976/
Res.， Bull， Obihiro Un山，18(1992) :49‑54 49
Purification of potato juice discharged in th巴 process of starch production by Euglenaρisciformis
Shinro YAMAMOTO'， Sueo KATO'， Tohru NISHIMURA' and Yosuke MINO'
(Received : May 29， 1992)
Abstract
In this study the utilization and decomposition of inorganic nitrogens， amino acids and pro同 国 for the growth of Euglena piscザorm日 (Ep) were examined.
The results are summarized as follows
1) Potato juice at higher concentrations inhibited the growth of Ep.
2) NHt and NOi were used as the sole source of nitrogen， while NOi was not Nitrate reductase activity was not detected in the cells of Ep
3) Among the amino acids tested， only glutamine and asparagine were used as the sole source of nitrogen
4) Asparagine， glutamine， arginine， threonine， phenylalanine and histidine were decomposed by Ep
5) Protein from potato tubers was used as the sole source of nitrogen.
NH ，tNOa， some kinds of amino acids and protein from potato tubers were utilized for the growth of Ep， but its growth rate was very slow. It is therefore concluded that potato juice could hardly be disposed by Ep alone
Key words Euglenαpisciformis， purification， potato juice Introduction
A large amount of potato juice is exhausted in the process of starch production from potato tubers. The juice has generally been discharged into rivers after aeration treat‑ ment. However. huge costs for this disposal has become a burden for starch factories from economic viewpoint. Part of the juice has recent1y been sprinkled onto grasslands as manure. As a consequence NOi accumu
lation in pastures due to the juice application and its offensive odor have brought about serious problems. NAKAYAMA2) reported that Euglena was more effective than Chlorella in its capacity for disposing waste water. In recent years Euglenαpisciform日 wasfound to proliferate in a cesspool in a starchfactory In this study an attemt was madeon the po ssibility whether or not the juice could be purified by the isolated E. pisciformis alone lLaboratory of Environmental Botany. Obihiro University of Agriculture and Veterinary Medicine. Obihiro. Hokkaido 080， Japan
2Laboratory of Natural Science. Kokugakuin University. Higashi 4 ‑10 ‑28. Shibuya‑ku.
Tokyo 150， Japan
49