title: Low-cost noninvasive optical CO2 sensing system for fermentation and cell culture.
abstract: High-throughput bioprocessing is a very promising technique for bioprocess development and optimization because of its high efficiency. The key to its development has been the availability of simple and inexpensive sensors to monitor the bioprocesses conducted in its small-scale bioreactors. Here we report on a low-cost noninvasive CO2 sensing system suitable for any transparent vessel. The system was composed of a CO2 sensing patch, a coaster, an interface, and a computer. The sensing film was prepared using the ion-pair technique. The coaster was a small self-made device with necessary optics and electronics for ratiometric measurements with a component cost of less than dollar 100. Results show that the system was stable and reliable despite its simplicity and low cost. The sensitivity of the CO2 sensing system was not affected by pH, media type, or temperature. It was shown to be stable for at least 10 days, long enough for most bioprocesses.
authors.affiliation: Center for Advanced Sensor Technology, Department of Chemical and Biochemical Engineering, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21250.
authors.forename: Xudong
authors.initials: X
authors.lastname: Ge
authors.forename: Yordan
authors.initials: Y
authors.lastname: Kostov
authors.forename: Govind
authors.initials: G
authors.lastname: Rao
mesh_terms: D019149:Bioreactors; D015374:Biosensing Techniques / Q000191:economics; D002245:Carbon Dioxide / Q000032:analysis*; D018929:Cell Culture Techniques; D004926:Escherichia coli / Q000201:enzymology; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D013696:Temperature
chemical_list: D002245:Carbon Dioxide