TY - JOUR
T1 - Lab-scale fermentation tests of microchip with integrated electrochemical sensors for pH, temperature, dissolved oxygen and viable biomass concentration
AU - Krommenhoek, Erik E.
AU - Van Leeuwen, Michiel
AU - Gardeniers, Han
AU - Van Gulik, Walter M.
AU - Van Den Berg, Albert
AU - Li, Xiaonan
AU - Ottens, Marcel
AU - Van Der Wielen, Luuk A.M.
AU - Heijnen, Joseph J.
PY - 2008/3/1
Y1 - 2008/3/1
N2 - This article shows the development and testing of a microchip with integrated electrochemical sensors for measurement of pH, temperature, dissolved oxygen and viable biomass concentration under yeast cultivation conditions. Measurements were done both under dynamic batch conditions as well as under prolonged continuous cultivation conditions. The response of the sensors compared well with conventional measurement techniques. The biomass sensor was based on impedance spectroscopy. The results of the biomass sensor matched very well with dry weight measurements and showed a limit of detection of ∼1 g/L. The dissolved oxygen concentration was monitored amperometrically using an ultra-microelectrode array, which showed an accuracy of ∼0.2 mg/L and negligible drift. pH was monitored using an ISFET with an accuracy well below 0.1 pH unit. The platinum thin-film temperature resistor followed temperature changes with ∼0.1°C accuracy. The dimensions of the multi sensor chip are chosen as such that it is compatible with the 96-well plate format.
AB - This article shows the development and testing of a microchip with integrated electrochemical sensors for measurement of pH, temperature, dissolved oxygen and viable biomass concentration under yeast cultivation conditions. Measurements were done both under dynamic batch conditions as well as under prolonged continuous cultivation conditions. The response of the sensors compared well with conventional measurement techniques. The biomass sensor was based on impedance spectroscopy. The results of the biomass sensor matched very well with dry weight measurements and showed a limit of detection of ∼1 g/L. The dissolved oxygen concentration was monitored amperometrically using an ultra-microelectrode array, which showed an accuracy of ∼0.2 mg/L and negligible drift. pH was monitored using an ISFET with an accuracy well below 0.1 pH unit. The platinum thin-film temperature resistor followed temperature changes with ∼0.1°C accuracy. The dimensions of the multi sensor chip are chosen as such that it is compatible with the 96-well plate format.
KW - Batch fermentation
KW - Impedance spectroscopy
KW - Integrated electrochemical sensors
KW - Ultra-microelectrode array
UR - http://www.scopus.com/inward/record.url?scp=39549090193&partnerID=8YFLogxK
U2 - 10.1002/bit.21661
DO - 10.1002/bit.21661
M3 - Article
C2 - 17929319
AN - SCOPUS:39549090193
SN - 0006-3592
VL - 99
SP - 884
EP - 892
JO - Biotechnology and Bioengineering
JF - Biotechnology and Bioengineering
IS - 4
ER -