Adsorption of caffeine onto tannic acid-immobilized fiber and its elution with hot water

Kazuma Yamagami*, Yuki Matsuura, Shigeko Kawai-Noma, Daisuke Umeno, Kyoichi Saito, Kunio Fujiwara, Takanobu Sugo, Yurika Yajima, Junpei Hioki, Takashi Shiono, Hideyuki Wakabayashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Tannic acid (TA) was immobilized onto nylon-6 fiber to adsorb caffeine. Glycidyl methacrylate (GMA) was graft-polymerized to gamma-ray-irradiated nylon-6 fiber and subsequently tannic acid was coupled with the epoxy groups of poly-GMA graft chain. The TA-immobilized fiber with a content of tannic acid of 25% exhibited an equilibrium amount of adsorbed caffeine of 3.1×10-2 mmol per g of the fiber at a concentration of 1 mM of caffeine solution. The amount of caffeine adsorbed was quantitatively eluted with 50°C hot water. After the eighth cycle of adsorption and elution, the amount of caffeine adsorbed onto the TA-immobilized fiber was retained without any deterioration.

Original languageEnglish
Pages (from-to)298-302
Number of pages5
Journalkagaku kogaku ronbunshu
Issue number5
Publication statusPublished - 2018
Externally publishedYes


  • Adsorption
  • Caffeine
  • Elution with hot water
  • Radiation-induced graft polymerization
  • Tannic acid-immobilized fiber

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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