JP2005528111A - プロセス制御として特定の酸素取り込み速度を用いた発酵プロセス。 - Google Patents
プロセス制御として特定の酸素取り込み速度を用いた発酵プロセス。 Download PDFInfo
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- JP2005528111A JP2005528111A JP2004510437A JP2004510437A JP2005528111A JP 2005528111 A JP2005528111 A JP 2005528111A JP 2004510437 A JP2004510437 A JP 2004510437A JP 2004510437 A JP2004510437 A JP 2004510437A JP 2005528111 A JP2005528111 A JP 2005528111A
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Abstract
Description
Porro et al., "Development of metabolically engineered Saccharonayces cefevisiae cells for the production of lactic acid", Biotechnol. Prog. 1995 May-Jun; 11 (3): 294-8. Porro et al.,"Replacement of a metabolic pathway for large-scale production of lactic acid from engineered yeasts", App. Environ. Microbiol. 1999 Sep: 65 (9): 4211-5. Bianchi et al. ,"Efficient homolactic fermentation by Klzyveroonyces lactis strains defective in pyruvate utilization and transformed with the heterologous LDH gene", App. Environ. Microbiol. 2001 Dec; 67 (12) 5621-5.
a) 発酵の生産期の間、前記OURを測定する工程と、
b) 発酵の前記生産期の間、飽和の1%未満のDOを維持しながら、所定の範囲内に、前記OURが維持されるような通気条件に調整する工程とを含む。
a) 発酵微生物が炭水化物を所望の発酵産物に発酵させるOUR値の至的範囲を決定する工程、
b) 細胞が生育および繁殖(reproduce)し、培地のDOを飽和の1%未満に減少させ、細胞が少なくとも10 mmol O2/g(細胞の乾燥重量)/h(mmol O2/gdw/h)である特定の酸素取り込み速度を示すように、前記培地に通気しながら、前記工学酵母細胞を、前記細胞が代謝可能である炭水化物および1以上の栄養素を含む培地で生育させる工程、
および、それから、
c)前記至的範囲内の特定の酸素取り込み速度(OUR)での培養を提供するのに十分な微好気条件を含む発酵条件下、緩衝培地で微生物を培養する工程。
a) 細胞が生育および繁殖(reproduce)し、培地の溶存酸素濃度を飽和の1%未満に減少させ、細胞が少なくとも10 mmol O2/g(細胞の乾燥重量)/h(mmol O2/gdw/h)である特定の酸素取り込み速度を示すように、前記培地に通気しながら、分裂されたPDC経路および前記細胞に所望の発酵産物を生産させることを可能にする外来遺伝子を有する工学酵母細胞を、前記細胞が代謝可能である炭水化物を含む培地で生育させる工程、
および、
b) 約0.8〜約3.0mmol O2/gdw/hの特定の酸素取り込み速度(OUR)での培養を提供するのに十分な微好気条件を含む発酵条件下、緩衝培地で細胞を培養する工程。
A. 収率が、少なくとも30g(発酵産物)/g(基質)、好ましくは少なくとも40g(発酵産物)/g(基質)、より好ましくは少なくとも60g(発酵産物)/g(基質)、さらに好ましくは75g(発酵産物)/g(基質)である。理論上の望ましい収率は100%であるが、実用上の収率の限界は約98%である。
B. 特定の生産力が、少なくとも0.1g(発酵産物)/g(細胞)/時間、好ましくは少なくとも0.3 g(発酵産物)/g(細胞)/時間、より好ましくは少なくとも0.4 g(発酵産物)/g(細胞)/時間、特に約0.5 g(発酵産物)/g(細胞)/時間である。特定の生産力は、できるだけ高いことが好ましい。
C. 滴定値(発酵産物の最大濃度)が、少なくとも15g/L(発酵培地)であり、好ましくは少なくとも20g/Lであり、より好ましくは40g/Lであり、さらに好ましくは80g/Lであり、また、150g/Lまでであり、好ましくは約120g/Lまでである。乳酸の場合、高濃度乳酸溶液(例えば、約150g/L以上)は、約35℃以下の温度で、非常に粘性またはゲル化する傾向にあるため、発酵培地の温度は、すぐに達成しうる適定の高値に影響する。約35-50℃のような高い発酵温度は、ゲル化または粘度が上昇することなく、高い滴定値を可能とする。
最大乳酸滴定量 106±3.1 g/kg
グルコース消費速度 1.2±0.05 g/gdw/h
乳酸生産速度 1.1±0.04 g/gdw/h
乳酸収率(生産期) 0.92±0.03 g(乳酸)/g(グルコース)
% 回収炭素 99%±3.0
乳酸の光学純度 >99.9
最大乳酸滴定量 111 g/kg
グルコース消費速度 0.94 g/gdw/h
乳酸生産速度 0.83 g/gdw/h
乳酸収率(生産期) 0.89 g(乳酸)/g(グルコース)
% 回収炭素 95.6%
乳酸の光学純度 >99.9
特性 実施例No.
3A 3B 3C
保持時間:DO=0 1hr 0 >1.5hr
OUR:生産期(mmol/gdw/h) 2.1 1.8 1.4
最大乳酸滴定量(g/kg) 112.3 84 94
グルコース消費速度(g/gdw/h) 1.22 1.06 0.40
乳酸生産速度(g/gdw/h) 1.20 0.93 0.32
乳酸収率(生産期、g/g) 0.89 0.84 0.79
% 回収炭素(生産期) 105 104.3 98
乳酸の光学純度(%) >99.9 >99.9 >99.9
Claims (30)
- 微生物が発酵基質を発酵させ、特定の酸素取り込み速度が、発酵プロセスの生産期の間モニタリングされ、そして、少なくとも1つの作動パラメータが、前記測定された酸素取り込み速度に応じて制御される、発酵プロセス。
- 前記溶存酸素濃度が、飽和量の1%未満である、請求項1記載のプロセス。
- 前記作動パラメータが、通気速度、攪拌速度および通気ガス組成から選択された1以上のパラメータである、請求項2記載のプロセス。
- 前記微生物が、分裂した固有のPDC経路を有する、遺伝子工学で設計された酵母である、請求項2記載のプロセス。
- 前記微生物が、細胞に所望の発酵産物を生産させることを可能にする、少なくとも1つの機能性外来遺伝子を有する、請求項4記載のプロセス。
- 前記外来遺伝子が、乳酸デヒドロゲナーゼ遺伝子である、請求項5記載のプロセス。
- 前記微生物が、Candida属またはKluyveromyces属である、請求項6記載のプロセス。
- 発酵微生物、微生物により発酵可能な基質を含む発酵培地において発酵プロセスを行う方法であって、
前記発酵培地が、多量の溶存酸素(DO)を有し、前記発酵が、特定の酸素取り込み(OUR)を示し、
a)発酵の生産期の間、前記OURを測定する工程、
b)発酵の前記生産期の間、飽和の1%未満にDOを維持しながら、所定の範囲内に前記OURが維持されるような通気条件に調整する工程を含む、発酵プロセスを行う方法。 - 前記工程b)におけるOURが、約0.8〜約3.0mmol O2/gdw/hの範囲に維持され、DOが、10μmol O2/L未満に維持される、請求項8記載のプロセス。
- 前記微生物が、クラブトリー陰性表現型を示す酵母細胞である、請求項9記載のプロセス。
- 前記酵母細胞が、Kluyveromyces属またはCandida属である、請求項10記載のプロセス。
- 前記酵母細胞が、分裂されたPDC経路、および、前記細胞に所望の発酵産物を生産させることを可能にする少なくとも1つの機能性外来遺伝子を有する、請求項11記載のプロセス。
- 前記外来遺伝子が、乳酸デヒドロゲナーゼ遺伝子である、請求項12記載のプロセス。
- 前記基質が、ヘキソース糖を含む、請求項8記載のプロセス。
- 前記ヘキソース糖が、グルコースを含む、請求項14記載のプロセス。
- 以下の工程を含むプロセス。
a)微生物が炭水化物を所望の発酵産物に発酵させる、OUR値の至的範囲を決定する工程、
b)細胞が生育および繁殖(reproduce)し、培地の溶存酸素濃度を飽和の1%未満に減少させ、細胞が少なくとも10 mmol O2/g(細胞の乾燥重量)/h(mmol O2/gdw/h)である特定の酸素取り込み速度を示すように、前記培地に通気しながら、前記工学酵母細胞を、前記微生物が代謝可能である炭水化物および1以上の栄養素を含む培地で生育させる工程、
および、それから
c)前記至的範囲内の特定の酸素取り込み速度(OUR)での培養を提供するのに十分な微好気条件を含む発酵条件下、緩衝培地で細胞を培養する工程。 - 前記微生物が、クラブトリー陰性表現型(Crabtree negative phenotype)を示す酵母細胞である、請求項9記載のプロセス。
- 前記酵母細胞が、Kluyveromyces属またはCandida属である、請求項17記載のプロセス。
- 前記酵母細胞が、分裂されたPDC経路、および、前記細胞に所望の発酵産物を生産されることを可能にする少なくとも1つの機能性外来遺伝子を有する、請求項18記載のプロセス。
- 前記外来遺伝子が、乳酸デヒドロゲナーゼ遺伝子である、請求項19記載のプロセス。
- 工程a)における前記OURが、少なくとも10 mmol O2/gdw/hである、請求項16記載のプロセス。
- 前記炭水化物が、ヘキソース糖を含む、請求項21記載のプロセス。
- 前記ヘキソース糖が、グルコースを含む、請求項22記載のプロセス。
- 以下の工程を含むプロセス。
a) 細胞が生育および繁殖(reproduce)し、培地の溶存酸素濃度をゼロに減少させ、細胞が少なくとも10 mmol O2/g(細胞の乾燥重量)/h(mmol O2/gdw/h)である特定の酸素取り込み速度を示すように、前記培地に通気しながら、分裂されたPDC経路および細胞に所望の発酵産物を生産させることを可能にする外来遺伝子を有する遺伝子工学で設計された酵母細胞を、前記細胞が代謝可能である炭水化物を含む培地で生育させる工程、
および
b)約0.8〜約3.0mmol O2/gdw/hの特定の酸素取り込み速度(OUR)での培養を提供するのに十分な微好気条件を含む発酵条件下、緩衝培地で細胞を培養する工程。 - 前記酵母細胞が、クラブトリー陰性表現型(Crabtree negative phenotype)を示す酵母細胞である、請求項24記載のプロセス。
- 前記外来遺伝子が、乳酸デヒドロゲナーゼ(LDH)遺伝子である、請求項25記載のプロセス。
- 前記酵母細胞が、Kluyveromyces属またはCandida属である、請求項26記載のプロセス。
- 工程a)における前記OURが、少なくとも18mmol O2/gdw/hである、請求項24記載のプロセス。
- 前記炭水化物が、ヘキソース糖を含む、請求項24記載のプロセス。
- ヘキソース糖が、グルコースを含む、請求項28記載のプロセス。
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011013721A1 (ja) | 2009-07-28 | 2011-02-03 | 三井化学株式会社 | 乳酸製造方法 |
| JPWO2011013721A1 (ja) * | 2009-07-28 | 2013-01-10 | 三井化学株式会社 | 乳酸製造方法 |
| US9096874B2 (en) | 2009-07-28 | 2015-08-04 | Mitsui Chemicals, Inc. | Method for producing lactic acid under pressure that exceeds normal atmospheric pressure |
| WO2013022070A1 (ja) * | 2011-08-11 | 2013-02-14 | 三井化学株式会社 | 連続培養によるイソプロピルアルコール製造方法 |
| JPWO2013022070A1 (ja) * | 2011-08-11 | 2015-03-05 | 三井化学株式会社 | 連続培養によるイソプロピルアルコール製造方法 |
| US9150885B2 (en) | 2011-08-11 | 2015-10-06 | Mitsui Chemicals, Inc. | Method for producing isopropyl alcohol by continuous culture |
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