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Enzyme Immobilizati...
Enzyme Immobilization in Polyelectrolyte Brushes: High Loading and Enhanced Activity Compared to Monolayers
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- Ferrand-Drake Del Castillo, Gustav, 1990 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Koenig, Meike (författare)
- Leibniz-Institut fur Polymerforschung,Leibniz Institute for Polymer Research,Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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- Müller, Martin (författare)
- Technische Universität Dresden,Leibniz-Institut fur Polymerforschung,Leibniz Institute for Polymer Research
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- Eichhorn, Klaus Jochen (författare)
- Leibniz-Institut fur Polymerforschung,Leibniz Institute for Polymer Research
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- Stamm, Manfred (författare)
- Technische Universität Dresden,Leibniz-Institut fur Polymerforschung,Leibniz Institute for Polymer Research
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- Uhlmann, Petra (författare)
- University of Nebraska - Lincoln,Leibniz-Institut fur Polymerforschung,Leibniz Institute for Polymer Research
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- Dahlin, Andreas, 1980 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2019-02-11
- 2019
- Engelska.
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Ingår i: Langmuir. - : American Chemical Society (ACS). - 1520-5827 .- 0743-7463. ; 35:9, s. 3479-3489
- Relaterad länk:
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Catalysis by enzymes on surfaces has many applications. However, strategies for efficient enzyme immobilization with preserved activity are still in need of further development. In this work, we investigate polyelectrolyte brushes prepared by both grafting-to and grafting-from with the aim to achieve high catalytic activity. For comparison, self-assembled monolayers that bind enzymes with the same chemical interactions are included. We use the model enzyme glucose oxidase and two kinds of polymers: anionic poly(acrylic acid) and cationic poly(diethylamino)methyl methacrylate. Surface plasmon resonance and spectroscopic ellipsometry are used for accurate quantification of surface coverage. Besides binding more enzymes, the "3D-like" brush environment enhances the specific activity compared to immobilization on self-assembled monolayers. For grafting-from brushes, multilayers of enzymes were spontaneously and irreversibly immobilized without conjugation chemistry. When the pH was between the pI of the enzyme and the pK a of the polymer, binding was considerable (thousands of ng/cm 2 or up to 50% of the polymer mass), even at physiological ionic strength. However, binding was observed also when the brushes were neutrally charged. For acidic brushes (both grafting-to and grafting-from), the activity was higher for covalent immobilization compared to noncovalent. For grafting-from brushes, a fully preserved specific activity compared to enzymes in the liquid bulk was achieved, both with covalent (acidic brush) and noncovalent (basic brush) immobilization. Catalytic activity of hundreds of pmol cm -2 s -1 was easily obtained for polybasic brushes only tens of nanometers in dry thickness. This study provides new insights for designing functional interfaces based on enzymatic catalysis.
Ämnesord
- NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Analytisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Industriell bioteknik -- Biokatalys och enzymteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Industrial Biotechnology -- Biocatalysis and Enzyme Technology (hsv//eng)
Nyckelord
- Spectroscopic ellipsometry
- Enzyme immobilization
- Catalysis
- Enzyme activity
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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