title: On-line oxygen uptake rate and culture viability measurement of animal cell culture using microplates with integrated oxygen sensors.
abstract: O2 uptake rates of animal cells (Chinese hamster ovary-CHO) were measured in 96-well microtiter plates by integrating with fluorescent sensors thereby measuring fluorescence intensity ratios of an O2-sensitive and an insensitive fluorophor. O2 consumption rate was estimated from measured dissolved O2 and from O2 mass transfer coefficient determined in advance. Specific uptake decreased with time from 3.2 x 10(-13) mol O2 cell(-1) h(-1) at 15 h cultivation to 1.8 x 10(-13) mol O2 cell(-1) h(-1) at 48 h. Specific O2 uptake was also determined by sampling from a spinner-flask culture giving identical values. A cell viability assay for cultures based on O2 measurements is described in which cells are incubated outside the fluorescence reader and then the dissolved O2 is measured only once at a fixed time after the start of incubation. This protocol can be directly applied for high-throughput measurements.
authors.affiliation: Biochemical Engineering Institute, Saarland University, 66123 Saarbruecken, Germany.
authors.forename: Rahul Ravi
authors.initials: RR
authors.lastname: Deshpande
authors.forename: Elmar
authors.initials: E
authors.lastname: Heinzle
mesh_terms: D000818:Animals; D016466:CHO Cells; D018929:Cell Culture Techniques / Q000379:methods; D002460:Cell Line; D049109:Cell Proliferation; D002470:Cell Survival; D006224:Cricetinae; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism*; D010101:Oxygen Consumption; D013997:Time Factors
chemical_list: D010100:Oxygen