JP2019055930A - 水中生育菌類の生長抑制方法 - Google Patents
水中生育菌類の生長抑制方法 Download PDFInfo
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Abstract
Description
本発明の一実施形態の水中生育菌類の生長抑制方法(以下、単に生長抑制方法ともいう)は、水に対して、蒸気状態のAITを適用する方法である。
図1は、クラドスポリウム(Cladosporium cladosporioides)の増殖抑制効果を確認するための試験方法を説明するための模式図である。図1に示されるように、実施例1において使用したデシケータ1は、上部に開口の形成された略円筒状の本体部2と、本体部2の上部開口を閉止するための蓋部3とを備える。本体部2は、円筒状の底部21と、底部よりも径の大きな円筒状の大径部22と、底部21と大径部22とを仕切る仕切り板23とからなる。仕切り板23は、複数の貫通孔23aを備える。まず、底部21に、以下の調製方法により調製した試験菌液Lを50mL滞留させた。このとき、試験菌液Lの直径は15cm、深さは3cmであった。次いで、仕切り板23上に、AITの原体からなる検体1mgを入れたサンプル瓶Gを載置した。この検体のAITが揮散することにより、デシケータ1内の蒸気状態のAITの濃度(処理濃度)は、5ppmとなる。蓋部を取り付けて密封し、25℃で1週間培養し、試験菌液中の試験菌を生長させるとともに、生長抑制効果を確認した。結果を表1に示す。
PDA斜面培地(DifcoTM Potato Dextrose Agar、ベクトン・ディッキンソン社製)にて、上記クラドスポリウムを充分に前培養した。その後、1/10濃度のPDB培地(DifcoTM Potato Dextrose Broth、ベクトン・ディッキンソン社製)を10mL加え、滅菌ループにて胞子を掻き取った後に濾過した。得られた濾液に生理食塩水を加えて50mL(約105CFU/mL)まで希釈し、これを試験溶液とした。
参照用として、検体を用いなかった以外は、実施例1と同様の方法により、試験菌液中の試験菌を生長させた。結果を表1に示す。
底部に滞留させた試験菌液50mLに対し、AITの原体1.0mgを直接添加した以外は、実施例1と同様の方法により、試験菌液中の試験菌を生長させるとともに、生長抑制効果を確認した。結果を表1に示す。
測定波長660nmにおける試験菌液の濁度を、分光光度計(型番:Multiskan GOアドバンス、Thermo Fisher Scientific社製)によって、測定し、以下の評価基準にしたがって、生長抑制効果を評価した。
(評価基準)
○:濁度が0.1未満であった。
×:濁度が0.1以上であった。
上記実施例のうち、実施例1および比較例1に関して、菌糸の生長がどの程度抑制されたかを、以下の評価基準にしたがって、確認した。
(評価基準)
○:生長が抑制された。
×:生長が抑制されなかった。
図2は、本発明の生長抑制方法によって、クラドスポリウムの菌糸の生長がどの程度抑制されるかを確認するための試験方法を説明するための模式図である。図2に示されるように、底部21に、水を100mL滞留させ、デシケータ1の仕切り板23上に、AITの原体からなる検体1mgを入れたサンプル瓶Gを載置した。また、仕切り板23上に水不透過性のガラスプレートSを載置し、その上に、上記と同様の方法により調製した試験菌液L1を50μL滴下した。この状態で、蓋部3を取り付けて密封し、25℃で1週間培養し、試験菌液中の試験菌を生長させるとともに、生長抑制効果を確認した。結果を表2に示す。
AITの原体からなる検体を入れたサンプル瓶を載置しなかった以外は、実施例2の場合と同様の方法により、試験菌液中の試験菌を生長させた。結果を表2に示す。
上記実施例1と、以下の実施例2〜3とに関して、AIT処理量と、処理面積および深さとの関係を検討した。具体的には、それぞれの実施例において、円柱状の容器に以下の寸法となるよう滞留水を滞留させることにより種々の適用箇所を想定し、生長抑制効果を確認した。実施例2〜3における生長抑制効果の確認方法は、実施例1と同様の条件により行った。
この容器に試験菌液を含む滞留水を滞留させる場合、「作用させる水面の単位表面積あたりのAIT処理量(μg/cm2)」に対する「作用させる水の深さ(cm)」の比率は、0.53となる。
この容器に試験菌液を含む滞留水を滞留させる場合、「作用させる水面の単位表面積あたりのAIT処理量(μg/cm2)」に対する「作用させる水の深さ(cm)」の比率は、0.18となる。
この容器に試験菌液を含む滞留水を滞留させる場合、「作用させる水面の単位表面積あたりのAIT処理量(μg/cm2)」に対する「作用させる水の深さ(cm)」の比率は、1.18となる。
2 本体部
21 底部
22 大径部
23 仕切り板
23a 貫通孔
3 蓋部
G サンプル瓶
L、L1 試験菌液
S ガラスプレート
Claims (3)
- 水に対して、蒸気状態のアリルイソチオシアネートを適用する、水中生育菌類の生長抑制方法。
- 前記水に対する前記アリルイソチオシアネートの処理量は、作用させる水面の単位表面積あたりのAIT処理量(μg/cm2)に対する作用させる水の深さ(cm)の比率が0.05〜5である、請求項1記載の水中生育菌類の生長抑制方法。
- 前記アリルイソチオシアネートの処理濃度は、5〜500ppmである、請求項1または2記載の水中生育菌類の生長抑制方法。
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JP2006188115A (ja) * | 2005-01-04 | 2006-07-20 | Valeo Thermal Systems Japan Corp | 抗菌剤を封入した容器の固定機構及びその容器 |
JP2011155972A (ja) * | 2010-01-08 | 2011-08-18 | Earth Chemical Co Ltd | 薬剤揮散器 |
JP2017048177A (ja) * | 2015-08-31 | 2017-03-09 | アース製薬株式会社 | 排水口用ヌメリ取り器 |
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JPH10277374A (ja) * | 1997-04-10 | 1998-10-20 | Rengo Co Ltd | 疎水性揮散物質の水溶化方法及び水中浸漬材料 |
JP2001248852A (ja) * | 2000-03-06 | 2001-09-14 | Matsushita Electric Ind Co Ltd | 空調装置 |
JP2003299721A (ja) * | 2002-04-12 | 2003-10-21 | Matsushita Electric Ind Co Ltd | 揮散性薬剤徐放装置とその装置を備えた自動車の送風回路 |
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