High cell density culture of Rhodococcus rhodochrous by pH-stat feeding and dibenzothiophene degradation

Hiroyuki Honda, Hiroyasu Sugiyama, Ikuo Saito, Takeshi Kobayashi
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引用次数: 64

Abstract

A high cell density culture of Rhodococcus rhodochrous IGTS8 was investigated. Acetic acid was one of the most suitable carbon sources for cell growth and sulfate ion was more suitable than dibenzothiophene (DBT) as a sulfur source. Fed-batch culture was conducted in a 1-l jar fermentor with FB medium containing acetic acid and sulfate ion as carbon and sulfur sources. Cell growth was found to be inhibited when the concentrations of acetic acid and ammonium ion were above 3 g/l. To control the concentrations of the two components below 3 g/l, a mixture of acetic acid and ammonium acetate was supplied by means of pH-stat feeding. As a result, a cell concentration of 33 g dry cells/l was obtained after 28-h cultivation. When the cells obtained were incubated in a fresh medium containing DBT as a substrate, hydroxybiphenyl (HBP), which is the end-product of the DBT degradation pathway, was detected and its production rate gradually increased with incubation time. Incubation for 3 to 4 h was enough for the full induction of DBT-degrading enzymes, and the specific production rate of HBP was about 6.1 mmol/kg dry cells/h. A two-phase cultivation (cell growth phase and induction phase) is proposed in order to obtain a high cell density and full induction of DBT-degrading enzymes.

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ph -稳态饲养和二苯并噻吩降解法培养红红红球菌
研究了红红红球菌IGTS8的高密度培养。乙酸是最适合细胞生长的碳源之一,硫酸根离子比二苯并噻吩(DBT)更适合作为硫源。以含有乙酸和硫酸盐离子的FB培养基为碳源和硫源,在1l罐发酵罐中进行补料分批培养。当乙酸和铵离子浓度大于3 g/l时,细胞生长受到抑制。为了控制两种组分的浓度低于3 g/l,采用pH-stat进料的方式提供乙酸和乙酸铵的混合物。结果表明,培养28 h后,细胞浓度为33 g dry cells/l。当获得的细胞在含有DBT作为底物的新鲜培养基中孵育时,检测到DBT降解途径的最终产物羟基联苯(hydroxybiphenyl, HBP),其产率随着孵育时间的增加而逐渐增加。培养3 ~ 4 h足以充分诱导dbt降解酶,HBP的比产率约为6.1 mmol/kg干细胞/h。为了获得高细胞密度和充分诱导dbt降解酶,提出了两期培养(细胞生长期和诱导期)。
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