Halloysite Clay Nanotubes for Enzyme Immobilization
Journal Article
·
· Biomacromolecules
- Louisiana Tech Univ., Ruston, LA (United States); Louisiana State University
- Louisiana Tech Univ., Ruston, LA (United States)
- Louisiana Tech Univ., Ruston, LA (United States); Ural Federal Univ., Ekaterinburg (Russia)
Halloysite clay is an aluminosilicate nanotube formed by rolling flat sheets of kaolinite clay. They have a 15 nm lumen, 50–70 nm external diameter, length of 0.5–1 μm, and different inside/outside chemistry. Due to these nanoscale properties, they are used for loading, storage, and controlled release of active chemical agents, including anticorrosions, biocides, and drugs. Here, we studied the immobilization in halloysite of laccase, glucose oxidase, and lipase. Overall, negatively charged proteins taken above their isoelectric points were mostly loaded into the positively charged tube’s lumen. Typical tube loading with proteins was 6–7 wt % from which one-third was released in 5–10 h and the other two-thirds remained, providing enhanced biocatalysis in nanoconfined conditions. Immobilized lipase showed enhanced stability at acidic pH, and the optimum pH shifted to more alkaline pH. Immobilized laccase was more stable with respect to time, and immobilized glucose oxidase showed retention of enzymatic activity up to 70 °C, whereas the native sample was inactive.
- Research Organization:
- Louisiana State Univ., Baton Rouge, LA (United States)
- Sponsoring Organization:
- Russian Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES); USEPA
- Grant/Contract Number:
- SC0012432
- OSTI ID:
- 1673765
- Journal Information:
- Biomacromolecules, Journal Name: Biomacromolecules Journal Issue: 2 Vol. 17; ISSN 1525-7797
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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