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Enzymatic biosensors towards a multiplexed electronic detection system for early cancer diagnostics


Grieshaber, D; Reimhult, E; Vörös, J (2007). Enzymatic biosensors towards a multiplexed electronic detection system for early cancer diagnostics. In: 2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems, Bangkok, Thailand, 16 January 2007 - 10 January 2007, 402-405.

Abstract

Enzymatic biosensors are expected to play a key-role in bio techno logical and biochemical analysis as shown by the success of glucose sensors in diabetes treatment. The aim of this work is to develop a multiplexed electronic detection system for early cancer diagnostics. Therefore, various enzymes were adsorbed to differently modified surfaces. Electrochemical optical waveguide lightmode spectroscopy (EC-OWLS) and electrochemical quartz crystal microbalance with dissipation (EC-QCM-D) were used to measure the mass and the activity of the adsorbed enzymes. The enzymes were specifically immobilized on a protein resistant PLL-g-PEG surface in order to reduce the loss of activity due to denaturation. In addition, enzymes were also incorporated into DNA-tagged vesicles to increase the signal and therefore the sensor sensitivity. The enzymatic activity of the different systems was compared. To further increase the sensitivity, ferrocyanide was used as an electron mediator.

Abstract

Enzymatic biosensors are expected to play a key-role in bio techno logical and biochemical analysis as shown by the success of glucose sensors in diabetes treatment. The aim of this work is to develop a multiplexed electronic detection system for early cancer diagnostics. Therefore, various enzymes were adsorbed to differently modified surfaces. Electrochemical optical waveguide lightmode spectroscopy (EC-OWLS) and electrochemical quartz crystal microbalance with dissipation (EC-QCM-D) were used to measure the mass and the activity of the adsorbed enzymes. The enzymes were specifically immobilized on a protein resistant PLL-g-PEG surface in order to reduce the loss of activity due to denaturation. In addition, enzymes were also incorporated into DNA-tagged vesicles to increase the signal and therefore the sensor sensitivity. The enzymatic activity of the different systems was compared. To further increase the sensitivity, ferrocyanide was used as an electron mediator.

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Additional indexing

Item Type:Conference or Workshop Item (Paper), refereed, original work
Communities & Collections:04 Faculty of Medicine > Institute of Biomedical Engineering
Dewey Decimal Classification:170 Ethics
610 Medicine & health
Language:English
Event End Date:10 January 2007
Deposited On:28 Apr 2014 09:26
Last Modified:10 Aug 2017 07:25
Publisher:IEEE
ISBN:1-4244-0609-9
Publisher DOI:https://doi.org/10.1109/NEMS.2007.352045

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