J. Technology and Education, Vol.31, No.1, pp.7-11 (2024)

研究論文

バナナ樹液採取法の検討および樹液の除錆効果

 

田中 孝国¹*，原田 みりあ¹，出川 強志¹，桑原 敬司²，武 成祥¹

¹小山工業高等専門学校　物質工学科 (〒323-0806 小山市中久喜771)

*tanakatakakuni@oyama-ct.ac.jp

²長岡技術科学大学 生物機能工学専攻 (〒940-2188 新潟県長岡市上富岡町1603-1)

 

Investigation of banana sap collection method and sap's effect

on rust elimination

 

Takakuni TANAKA, Miria HARADA, Tsuyoshi DEGAWA, Takashi KUWAHARA

and Seisho TAKE

National Institute of Technology, Oyama College

(771 Nakakuki, Oyama City, Tochigi 323-0806, JAPAN)

Nagaoka University of Technology, Department of Bioengineering

(1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, JAPAN)

 

(Received April 12, 2024; Accepted May 22, 2024)

 

This study was conducted with the objective of effectively utilizing banana sap. First, an efficient method of collecting sap from banana stems was studied. After crushing the stems, sap was obtained by pressing. The sap obtained was centrifuged for coarse separation. Seventy percent of the sap was obtained by weight from the stems. The concentration of oxalic acid (salt) in the sap was determined to be about 640 [mg/kg^-1] by titration with sodium hydroxide and about 900 [mg/kg^-1] by redox titration. As compared to other food products, the results suggested that the liquid contained high concentrations. The results of the experiment in which the rust sample was immersed in sap showed that the rust-removal effect could be visually confirmed; at the same time, the elution of rust into the sap could be observed by the change in turbidity. These results indicate that banana sap has a rust-removing effect.

Key words: banana sap / oxalic acid / rust