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Table 1 Oxygen transfer coefficient k L a (h−1) value for fermentations with conventional air sparged and MBD sparged fermentations (n = 2)

From: Microbubble assisted polyhydroxybutyrate production in Escherichia coli

Air supply Air-sparger Air-sparger Air-sparger Air-sparger Air-sparger Air-sparger MBD
Agitation rate (rpm) 350 350 500 500 750 750 350
Air sparge rate (vvm) 0.4 0.8 0.4 0.8 0.4 0.8
kLa (h−1) 16.81 22.01 23.47 27.53 32.86 34.29 23.12
OD600 (48 h) 3.66 6.21 5.99 7.98 10.68 13.86 8.17
PHB % (48 h) 20.25 23.93 26.12 46.46 47.33 54.08 43.14