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Optimization of Production Medium by Response Surface Method and Development of Fermentation Condition for Monascus pilosus Culture  

Yoon, Sang-Jin (Division of biotechnology, Chonbuk National University)
Shin, Woo-Shik (Department of Molecular Bioscience, Kangwon National University)
Chun, Gie-Taek (Department of Molecular Bioscience, Kangwon National University)
Jeong, Yong-Seob (Research Center for industrial Development of Biofood Materials, Kangwon National University)
Publication Information
KSBB Journal / v.22, no.5, 2007 , pp. 288-296 More about this Journal
Abstract
Monascus pilosus (KCCM 60160) in submerged culture was optimized based on culture medium and fermentation conditions. Monacolin-K (Iovastatin), one of the cholesterol lowing-agent which was produced by Monascus pilosus may maintain a healthy lipid level by inhibiting the biosynthesis of cholesterol. Plackett-Burman design and response surface method were employed to study the culture medium for the desirable monacolin-K production. As a result of experimental designs, optimized production medium components and concentrations (g/L) were determined on soluble starch 96, malt extract 44.5, beef extract 30.23, yeast extract 15, $(NH_4)_2SO_4$ 4.03, $Na_2HPO_4{\cdot}12H_2O$ 0.5, L-Histidine 3.0, $KHSO_4$ 1.0, respectively. Monacolin-K production was improved about 3 times in comparison with shake flask fermentation of the basic production medium. The effect of agitation speed (300, 350, 400 and 450 rpm) on the monacolin-K production were also observed in a batch fermenter. Maximum monacolin-K production with the basic production medium was 68 mg/L when agitation speed was 500 rpm. And it was found that all spherical pellets (average diameter of $1.0{\sim}1.5mm$) were dominant during fermentation. Based on the results, the maximum production of 185 mg/L of monacolin-K with the optimized production medium was obtained at pH (controlled) 6.5, agitation rate 400 rpm, aeration rate 1 vvm, and inoculum size 3%.
Keywords
Monascus pilosus; monacolin-K;
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