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Picodroplet-deposition of enzymes on functionalized self-assembled monolayers as a basis for miniaturized multi-sensor structures

Mosbach, M; Zimmermann, H.; Laurell, Thomas LU ; Nilsson, J.; Csöregi, Elisabeth LU and Schuhmann, W. (2001) In Biosensors & Bioelectronics 16(9-12). p.827-837
Abstract
We are reporting on a novel approach for structured immobilisation of enzymes on gold surfaces modified with monolayers of functionalised alkylthiols. The formation of enzyme spots is achieved by shooting very small volumes of an appropriate enzyme solution (down to 100 pl) onto a thiol-monolayer modified gold surface using a micro-dispenser. Formation of enzyme patterns is obtained by moving the micro-dispenser relative to the modified gold surface using a micro-positioning device. Enzyme spots with typical lateral dimensions of 100 ml are obtained, but also, more complex structures, e.g. lines or meander structures, can be achieved by multiple droplets dispensed during the concomitant movement of the micro-dispenser. The first enzyme... (More)
We are reporting on a novel approach for structured immobilisation of enzymes on gold surfaces modified with monolayers of functionalised alkylthiols. The formation of enzyme spots is achieved by shooting very small volumes of an appropriate enzyme solution (down to 100 pl) onto a thiol-monolayer modified gold surface using a micro-dispenser. Formation of enzyme patterns is obtained by moving the micro-dispenser relative to the modified gold surface using a micro-positioning device. Enzyme spots with typical lateral dimensions of 100 ml are obtained, but also, more complex structures, e.g. lines or meander structures, can be achieved by multiple droplets dispensed during the concomitant movement of the micro-dispenser. The first enzyme layer on top of the functionalised thiol-monolayer is subsequently covalently immobilised using either carbodiimide activation of carboxilic headgroups at the enzyme or via already introduced activated ester functions at the monolayer. Immobilised enzyme activities of glucose oxidase and lactate oxidase patterns have been characterised by means of scanning electrochemical microscopy. The product of the enzyme-catalysed reaction, H2O2, is detected with an micro-electrode in the presence of either or both substrates, glucose and lactate, leading to a visualisation of the corresponding enzyme pattern and the lateral enzymatic activity. (C) 2001 Elsevier Science B.V. All rights reserved. (Less)
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organization
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Contribution to journal
publication status
published
subject
keywords
microdispenser, microstructure, enzymes, scanning electrochemical, microscopy, SCANNING ELECTROCHEMICAL MICROSCOPY, MODIFIED GOLD ELECTRODE, CAPILLARY-ELECTROPHORESIS, AMPEROMETRIC BIOSENSORS, GLUCOSE-OXIDASE, REDOX ENZYMES, SURFACES, IMMOBILIZATION, POLYPYRROLE, FABRICATION
in
Biosensors & Bioelectronics
volume
16
issue
9-12
pages
827 - 837
publisher
Elsevier
external identifiers
  • WOS:000172169500027
  • Scopus:0034776675
ISSN
1873-4235
DOI
10.1016/s0956-5663(01)00205-6
language
English
LU publication?
yes
id
b3ff387f-bdfe-41ff-b42e-363a7d793736 (old id 2376433)
date added to LUP
2012-03-23 09:01:25
date last changed
2016-10-13 04:34:09
@misc{b3ff387f-bdfe-41ff-b42e-363a7d793736,
  abstract     = {We are reporting on a novel approach for structured immobilisation of enzymes on gold surfaces modified with monolayers of functionalised alkylthiols. The formation of enzyme spots is achieved by shooting very small volumes of an appropriate enzyme solution (down to 100 pl) onto a thiol-monolayer modified gold surface using a micro-dispenser. Formation of enzyme patterns is obtained by moving the micro-dispenser relative to the modified gold surface using a micro-positioning device. Enzyme spots with typical lateral dimensions of 100 ml are obtained, but also, more complex structures, e.g. lines or meander structures, can be achieved by multiple droplets dispensed during the concomitant movement of the micro-dispenser. The first enzyme layer on top of the functionalised thiol-monolayer is subsequently covalently immobilised using either carbodiimide activation of carboxilic headgroups at the enzyme or via already introduced activated ester functions at the monolayer. Immobilised enzyme activities of glucose oxidase and lactate oxidase patterns have been characterised by means of scanning electrochemical microscopy. The product of the enzyme-catalysed reaction, H2O2, is detected with an micro-electrode in the presence of either or both substrates, glucose and lactate, leading to a visualisation of the corresponding enzyme pattern and the lateral enzymatic activity. (C) 2001 Elsevier Science B.V. All rights reserved.},
  author       = {Mosbach, M and Zimmermann, H. and Laurell, Thomas and Nilsson, J. and Csöregi, Elisabeth and Schuhmann, W.},
  issn         = {1873-4235},
  keyword      = {microdispenser,microstructure,enzymes,scanning electrochemical,microscopy,SCANNING ELECTROCHEMICAL MICROSCOPY,MODIFIED GOLD ELECTRODE,CAPILLARY-ELECTROPHORESIS,AMPEROMETRIC BIOSENSORS,GLUCOSE-OXIDASE,REDOX ENZYMES,SURFACES,IMMOBILIZATION,POLYPYRROLE,FABRICATION},
  language     = {eng},
  number       = {9-12},
  pages        = {827--837},
  publisher    = {ARRAY(0xd721db0)},
  series       = {Biosensors & Bioelectronics},
  title        = {Picodroplet-deposition of enzymes on functionalized self-assembled monolayers as a basis for miniaturized multi-sensor structures},
  url          = {http://dx.doi.org/10.1016/s0956-5663(01)00205-6},
  volume       = {16},
  year         = {2001},
}