Adsorption of catechin in green-tea extracts onto NVP-grafted fiber and its elution with NaOH

Ryunosuke Kawamura, Shota Goto, Yuki Matsuura, Shigeko Kawai-Noma, Daisuke Umeno, Kyoichi Saito, Kunio Fujiwara, Takanobu Sugo, Yurika Yajima, Akiko Kinoshita, Azusa Kudo, Jumpei Hioki, Hideyuki Wakabayashi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


For the removal of catechin from green-tea extracts, N-vinylpyrrolidone-grafted fiber was prepared by radiation-in-duced graft polymerization of N-vinylpyrrolidone (NVP) onto a commercially available 6-nylon fiber. The adsorption isotherm of the NVP fiber with a density of 3.9 mmol/g for catechin in green-tea extracts was well correlated by Lang-muir-type equation. The maximum adsorption capacity and adsorption constant were 0.23 mmol/g and 13 L/mmol, respectively. Catechin adsorbed onto the NVP fiber was eluted completely with 0.1 M NaOH. In the second to fourth cycles of adsorption and elution, the amount of catechin adsorbed onto the NVP fiber remained almost constant.

Original languageEnglish
Pages (from-to)99-102
Number of pages4
Journalkagaku kogaku ronbunshu
Issue number2
Publication statusPublished - 2018
Externally publishedYes


  • Adsorption isotherm
  • Catechin
  • Green tea
  • N-vinylpyrrolidone
  • NVP-grafted fiber

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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