Enhanced production of itaconic acid by transformed fungal cells of Aspergillus terreus harboring Vitreoscilla Hemoglobin Gene

Shin, Woo-Shik; Kim, Chongam; Jeong, Yong‐Seob; Park, Chulhwan; Kim, Sang Yong; Lee, Jun Young; Lee, Jong–Dae; Chun, Gie-Taek

doi:10.1016/j.jbiosc.2009.08.359

Cited by 4 publications

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“…In general, it is well known that secondary metabolites such as IA are produced through complex anabolic pathways, requiring a sufficient amount of ATP (and thus O 2 ) for their biosynthesis [6,28]. Our group also observed that IA productivity by the recombinant strain of A. terreus transformed with a bacterial (Vitreoscilla) hemoglobin (vhb) gene was 37% higher compared with the parallel nontransformed strain, revealing the importance of DO availability for the enhanced production of IA [25].…”

Section: Influence Of Agitation Speed On Itaconic Acid Productionmentioning

confidence: 51%

Application of Scale-Up Criterion of Constant Oxygen Mass Transfer Coefficient (kLa) for Production of Itaconic Acid in a 50 L Pilot-Scale Fermentor by Fungal Cells of Aspergillus terreus

Shin¹

2013

J. Microbiol. Biotechnol.

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The scale-up criterion of constant oxygen mass transfer coefficient (kLa) was applied for the production of itaconic acid (IA) in a 50 L pilot-scale fermentor by the fungal cells of Aspergillus terreus. Various operating conditions were examined to collect as many kLa data as possible by adjusting the stirring speed and aeration rate in both 5 L and 50 L fermentor systems. In the fermentations performed with the 5 L fermentor, the highest IA production was obtained under the operating conditions of 200 rpm and 1.5 vvm. Accordingly, we intended to find out parallel agitation and aeration rates in the 50 L fermentor system, under which the kLa value measured was almost identical to that (0.02 sec(-1)) of the 5 L system. The conditions of 180 rpm and 0.5 vvm in the 50 L system turned out to be optimal for providing almost the same volumetric amount of dissolved oxygen (DO) into the fermentor, without causing shear damage to the producing cells due to excessive agitation. Practically identical fermentation physiologies were observed in both fermentations performed under those respective operating conditions, as demonstrated by nearly the same values of volumetric (Qp) and specific (qp) IA production rates, IA production yield (Yp/s), and specific growth rate (μ). Specifically, the negligible difference of the specific growth rate (μ) between the two cultures (i.e., 0.029 h(-1) vs. 0.031 h(-1)) was notable, considering the fact that μ normally has a significant influence on qp in the biosynthesis of secondary metabolites such as itaconic acid.

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Section: Influence Of Agitation Speed On Itaconic Acid Productionmentioning

confidence: 51%