Use of silk fibroin for enzyme membrane

Akio Kuzuhara, Tetsuo Asakura, Ryuzo Tomoda, Tadashi Matsunaga

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

Bombyx mori and Philosamia cynthia ricini silk fibroins were employed for preparing enzyme membranes. Glucose oxidase (GOD) was entrapped in the silk fibroin membrane without glutaraldehyde treatment. The entrapped GOD was tested with the colorimetric method. The activity yield of GOD was 98.7% when 3.71 × 10-3 U of GOD were immobilized in 1.1 mg dry weight B. mori silk fibroin membrane (300 μm). The enzyme leakage from the enzyme membrane was only 0.05% after 36 days. In addition, the activity after heating at 60°C for 20 min was unchanged. IR spectra indicated that the GOD-B. mori silk fibroin membrane contained 80% random coil and 20% silk II (anti-parallel β-sheet) structures. When it was soaked in 80% methanol for 30 s, the ratio of silk II changed to 50%. These results explained that the densely packed surface prevented the GOD from leaking.

Original languageEnglish
Pages (from-to)199-207
Number of pages9
JournalJournal of Biotechnology
Volume5
Issue number3
DOIs
Publication statusPublished - 1987
Externally publishedYes

Fingerprint

Fibroins
Glucose Oxidase
Glucose oxidase
Silk
Enzymes
Membranes
Bombyx
Glutaral
Heating
Methanol
Weights and Measures

Keywords

  • Bombyx mori
  • Enzyme membrane
  • Glucose oxidase
  • Silk fibroin
  • Silk II structure

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology

Cite this

Use of silk fibroin for enzyme membrane. / Kuzuhara, Akio; Asakura, Tetsuo; Tomoda, Ryuzo; Matsunaga, Tadashi.

In: Journal of Biotechnology, Vol. 5, No. 3, 1987, p. 199-207.

Research output: Contribution to journalArticle

Kuzuhara, Akio ; Asakura, Tetsuo ; Tomoda, Ryuzo ; Matsunaga, Tadashi. / Use of silk fibroin for enzyme membrane. In: Journal of Biotechnology. 1987 ; Vol. 5, No. 3. pp. 199-207.
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N2 - Bombyx mori and Philosamia cynthia ricini silk fibroins were employed for preparing enzyme membranes. Glucose oxidase (GOD) was entrapped in the silk fibroin membrane without glutaraldehyde treatment. The entrapped GOD was tested with the colorimetric method. The activity yield of GOD was 98.7% when 3.71 × 10-3 U of GOD were immobilized in 1.1 mg dry weight B. mori silk fibroin membrane (300 μm). The enzyme leakage from the enzyme membrane was only 0.05% after 36 days. In addition, the activity after heating at 60°C for 20 min was unchanged. IR spectra indicated that the GOD-B. mori silk fibroin membrane contained 80% random coil and 20% silk II (anti-parallel β-sheet) structures. When it was soaked in 80% methanol for 30 s, the ratio of silk II changed to 50%. These results explained that the densely packed surface prevented the GOD from leaking.

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