JP4968816B2 - バチルス属細菌の芽胞形成方法 - Google Patents
バチルス属細菌の芽胞形成方法 Download PDFInfo
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- JP4968816B2 JP4968816B2 JP2006063414A JP2006063414A JP4968816B2 JP 4968816 B2 JP4968816 B2 JP 4968816B2 JP 2006063414 A JP2006063414 A JP 2006063414A JP 2006063414 A JP2006063414 A JP 2006063414A JP 4968816 B2 JP4968816 B2 JP 4968816B2
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- bacillus
- culture
- culture solution
- dissolved oxygen
- spore
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- PSZYNBSKGUBXEH-UHFFFAOYSA-M naphthalene-1-sulfonate Chemical compound C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-M 0.000 description 1
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- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
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- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
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- RCMHUQGSSVZPDG-UHFFFAOYSA-N phenoxybenzene;phosphoric acid Chemical compound OP(O)(O)=O.C=1C=CC=CC=1OC1=CC=CC=C1 RCMHUQGSSVZPDG-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Description
上記のアルカリ剤としては、水酸化ナトリウム、水酸化カリウム、アンモニア水等、特に制限はされないが、CSL溶液や濃縮焼酎かす溶液のpHをおおよそ6.5〜8.0程度にまで上昇させると、CSLや濃縮焼酎かすの不溶物の除去を効率よく行うことができるため好ましい。
ここで、工程(A)と工程(B)を含んでいる場合は、この順序でこれらの工程を含んでいることが好ましい。また、工程(A)と工程(B)を含んでいる場合、工程(A)と工程(B)とを個別的に含んでいてもよいし、バチルス属細菌を増殖させながら培養液の溶存酸素率を10%以下に低下させる、すなわち工程(A)と工程(B)とを同時並行的に含んでいてもよい。
生細胞は白く抜けて見え、胞子は赤く染まるため、この方法により胞子形成を確認することができる。
[比較例1]
[比較例2]
[比較例3]
[比較例4]
酵母エキス(日本製紙ケミカル株式会社製 商品名:SK酵母エキスS−2)4重量%、グルコース(和光純薬株式会社製)0.2重量%を含む培地65リットル(pH7.0に調整)を100リットル容のジャーファーメンターに入れ、121℃で15分間オートクレーブ滅菌した。その後、実施例1と同じ菌株の前培養液300mlを前述のオートクレーブした培地に植菌し、培養を開始した。培養開始後経時的に菌濃度(A660)を測定し、菌体の増殖を確認した。培養開始4時間後当たりから急速に菌体の増殖が確認されたため、培養開始6時間後から15時間後まで、溶存酸素濃度が100分の数ppmとなるように攪拌速度を保った。この培養における培養液の温度、撹拌速度(AGI)、溶存酸素濃度(ppm)、pH、通気量、菌体量(O.D.660)の経時的な推移を表9に示す。
さらにもう1日培養を継続したところ、生菌数は、4.5×108cfu/ml、pHは8.7となった。凍結乾燥物は、2.52g、生菌数は、6.9×1011cfu/gであり、濃縮焼酎かすと混用した実施例4の場合と比較して、採取量・生菌数共に大幅に少なかった。
Claims (12)
- 溶存酸素率が10%以下の培養液でバチルス属細菌を培養する工程(C)と、工程(C)の後に、溶存酸素率が10%より多い培養液でバチルス属細菌を培養する工程(D)と、工程(D)の後に、バチルス属細菌の芽胞を得る工程(E)を備えたことを特徴とするバチルス属細菌の芽胞を形成する方法。
- 溶存酸素率が10%以下の培養液で培養するバチルス属細菌が、対数増殖期(Log Phase)以降のバチルス属細菌であることを特徴とする請求項1に記載のバチルス属細菌の芽胞を形成する方法。
- 溶存酸素率が10%以下の培養液で培養するバチルス属細菌が、対数増殖期(Log Phase)及び静止期(Stationary Phase)のバチルス属細菌であることを特徴とする請求項1に記載のバチルス属細菌の芽胞を形成する方法。
- 工程(C)の前に、溶存酸素率が10%より多い培養液でバチルス属細菌を培養してバチルス属細菌を増殖させる工程(A)、及び/又は、培養液の溶存酸素率を10%以下にする工程(B)を、さらに含むことを特徴とする請求項1〜3のいずれかに記載のバチルス属細菌の芽胞を形成する方法。
- 培養液への通気量及び/又は培養液の撹拌速度を調節することによって、培養液の溶存酸素率を10%以下にすることを特徴とする請求項1〜4のいずれかに記載のバチルス属細菌の芽胞を形成する方法。
- 培養液が、酵母エキス、コーンスティープリカー、大豆ペプトン、及び濃縮焼酎かすからなる群から選ばれるいずれか1種以上の成分を含有することを特徴とする請求項1〜5のいずれかに記載のバチルス属細菌の芽胞を形成する方法。
- 培養液が、酵母エキス、コーンスティープリカー、大豆ペプトン、及び濃縮焼酎かすからなる群から選ばれるいずれか2種以上の成分を含有することを特徴とする請求項6に記載のバチルス属細菌の芽胞を形成する方法。
- 培養液が、酵母エキスを0.2〜10.0重量%、コーンスティープリカーを0.5〜20.0重量%、大豆ペプトンを0.2〜10.0重量%、濃縮焼酎かすを0.2〜20.0重量%含有することを特徴とする請求項7に記載のバチルス属細菌の芽胞を形成する方法。
- 培養液が、糖類をさらに含有することを特徴とする請求項6〜8のいずれかに記載のバチルス属細菌の芽胞を形成する方法。
- 培養液が、糖類を0.05〜5.0重量%含有することを特徴とする請求項9に記載のバチルス属細菌の芽胞を形成する方法。
- バチルス属細菌が、バチルス ズブチリス(Bacillus subtilis)、バチルス アミロリクエファシエンス(Bacillus amyloliquefaciens)、バチルス パミルス(Bacillus pumils)、バチルス レンタス(Bacillus lentus)、バチルス ラテロスポルス(Bacillus laterosporus)、バチルス アルベイ(Bacillus alvei)、バチルス ポピリエ(Bacillus popilliae)、及びバチルス リチェニフォルミス(Bacillus licheniformis)からなる群から選ばれるいずれかであることを特徴とする請求項1〜10のいずれかに記載のバチルス属細菌の芽胞を形成する方法。
- バチルス属細菌が、バチルス ズブチリス(Bacillus subtilis)FERM BP−10244又はその変異株であることを特徴とする請求項1〜11のいずれかに記載のバチルス属細菌の芽胞を形成する方法。
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