JP6257499B2 - 滅菌プロセスをモニターするための方法 - Google Patents
滅菌プロセスをモニターするための方法 Download PDFInfo
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- JP6257499B2 JP6257499B2 JP2014238259A JP2014238259A JP6257499B2 JP 6257499 B2 JP6257499 B2 JP 6257499B2 JP 2014238259 A JP2014238259 A JP 2014238259A JP 2014238259 A JP2014238259 A JP 2014238259A JP 6257499 B2 JP6257499 B2 JP 6257499B2
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- spores
- conductive material
- bacillus
- sterilization
- spore
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6486—Measuring fluorescence of biological material, e.g. DNA, RNA, cells
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/02—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving viable microorganisms
- C12Q1/22—Testing for sterility conditions
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Description
生/死のバチルス・アトロファエウス芽胞の膜電位の評価は、膜電位変化とバイアビリティとの間の相関を説明する。膜電位は、DiOC6(3)およびPicofluor蛍光メーターを使用して測定する。生存可能および(オートクレーブされた)生存不能な両芽胞を、37℃にて代表的な時間、トリプシン性大豆培地およびDiOC6(3)内で培養する。示した培養時間後、これらの生物を取り出し、そしてトリス/EDTA(pH7.4)にて洗浄する。次に蛍光測定を行う。この結果を図1に示す。
平面上の生存可能なゲオバチルス・ステアロサーモフィルス芽胞の電気的検出
伝導性金属化材料を、およそクレジットカードのサイズの非伝導性マイラーシート上に均等に成型する。マイラーシートは気体および液体の両方に不透過性である。ポリアクリルアミド/ポリアニリン混合物を、金属化層の上に成型する。ポリアクリルアミド/ポリアニリン混合物は、気体および蒸気の両方に透過性である。ゲオバチルス・ステアロサーモフィルス芽胞を、108cfu/mlの濃度にてポリアクリルアミド/ポリアニリン混合物中に再懸濁する。この芽胞濃度は、インクジェットプリンターからそれぞれ10pL(ピコリットル)の液滴に単一の芽胞を与える。芽胞ポリアクリルアミド/ポリアニリン混合物を、アレイフォーマットにて、成型したポリアクリルアミド/ポリアニリンフィルム上に堆積する。第2の伝導性金属化材料を芽胞のアレイの上方に成型する。これは生物学的インジケータ(BI)カードを形成する。芽胞が出芽するときに、材料の導電率が増加し始める。電流を、ダーリントンカップルのようなシリアルトランジスタプリアンプによって検出する。これらのダーリントントランジスタは対であるため、それらは電流の増幅を可能にする。ダーリントントランジスタを、システムの電流をモニターするリードに連結する。マイラーのような気体バリアを、使用直前まで、剥離性接着剤によってインジケータの上に付着する。使用時にこのバリアを取り外し、滅菌装置内に設置されたときに、蒸気または気体がシステムを透過し得る。インジケータの遠端に、生存可能な芽胞を出芽させることを可能にする培養培地を含む小さい破壊容易なチャンバをおく。蒸気または蒸発性過酸化水素を利用する滅菌プロセス後、生物学的インジケータを培養する。
平面上の生存可能なゲオバチルス・ステアロサーモフィルス芽胞の蛍光検出
ポリアクリルアミド層を、およそクレジットカードのサイズのポリプロピレンバッキング上に成型する。ポリアクリルアミド層は、水和している単分子層として作用する。ゲオバチルス・ステアロサーモフィルス芽胞を、次いで生物のスポット内にプリントする。スポットを、アレイまたはグリッドフォーマットにてプリントし、各スポットは150〜300芽胞を含む。一端に、必要な蛍光体を有する培養培地を含む破壊容易なチャンバをおく。滅菌プロセスの完了時に、BIカードを、滅菌装置内に統合されているカードリーダー/インキュベータースロット内に挿入する。リーダー/インキュベーターは、培養温度を維持する加熱ブロック、LED励起源、蛍光検出のための発光ダイオード、ユーザーが読むことができる形態にサイクルパラメーターおよびロードIDを示すプリントヘッド、BIカードをスロット内に先導し、培養培地を含みかつ培地分散を助ける破壊容易なチャンバを壊すことによってBIを自動的に活性させるローラー、磁気ストリップスキャナー、ならびにデバイスロードおよび滅菌サイクルまでBIカードの結果をたどるバーコードリーダーからなる。
独立型リーダー/インキュベーター
リーダー/インキュベーターは、実施例2および実施例3に記載のいずれかのリーダー/インキュベーターについて独立型ユニットであり得る。独立型ユニットにおいて、全ての電子装置は、滅菌装置自体の中に統合されたリーダー/インキュベーターと同じである。
Claims (13)
- 滅菌インジケータを作製する方法であって、
インクジェットプリンターを使用して、基板上に導電性材料を堆積させる工程;
該インクジェットプリンターを使用して、該導電性材料の一部または全部の上に芽胞をアレイ状に堆積させる工程を含み、
前記導電性材料の電気特性の変化を検出するように適合された、導電性材料と電気的に連通する、電気回路を提供する、
方法。 - 前記電気回路が、前記芽胞の膜電位の変化を検出できる検出回路を含む、請求項1に記載の方法。
- 前記芽胞の膜電位の変化が、前記導電性材料中の電位、電流、抵抗およびインピーダンスの1またはそれ以上のパラメーターによりモニターされることにより検出されるものである、請求項2に記載の方法。
- 前記芽胞が、ゲオバチルス・ステアロサーモフィルス、バチルス・アトロファエウス、バチルス・サブチリス、バチルス・プミルス、バチルス・コアグランス、クロストリジウム・スポロゲネス、バチルス・サブチリス・グロビジ、バチルス・セレウス、バチルス・サーキュランスの芽胞またはそれらの2またはそれ以上の混合物である、請求項1〜3のいずれか1に記載の方法。
- 前記芽胞が、少なくとも1つの試験生物と、酵素を生産するのに適した少なくとも1つのレポーター遺伝子を有し、該レポーター遺伝子が該試験生物に取り込まれる、遺伝的に操作された芽胞を含む請求項1〜4のいずれか1に記載の方法。
- 前記方法が、取り外し可能な気体および/または液体不透過性の膜を、少なくとも前記芽胞の上に適用されることをさらに含む、請求項1〜4のいずれか1に記載の方法。
- 滅菌プロセスをモニターする方法であって、
インクジェットプリンターを使用して、基板上に導電性材料を堆積させる工程;および
該インクジェットプリンターを使用して、該導電性材料の一部または全部の上にアレイ状に芽胞を堆積させる工程;
導電性材料と電気的に連通する、電気回路を提供する工程:
ここで、該電気回路は、該導電性材料の電気特性の変化を検出するように適合されており、
該芽胞を滅菌媒体に曝露する工程;および
該導電性材料の電気的特性にいかなる変化が生じるかを決定する工程
を含む、方法。 - 前記電気的特性の変化が、前記導電性材料中の電圧、電流、抵抗およびインピーダンスの1またはそれ以上のパラメータをモニターすることにより検出される、請求項7に記載の方法。
- 曝露する工程の後であって決定する工程の前に、前記芽胞が培養培地で培養される、請求項7または8のいずれか1に記載の方法。
- 前記滅菌媒体が、少なくとも1つの液体滅菌剤または少なくとも1つのガス状滅菌剤または蒸気を含む、請求項7〜9にいずれか1に記載の方法。
- 前記芽胞が、ゲオバチルス・ステアロサーモフィルス、バチルス・アトロファエウス、バチルス・サブチリス、バチルス・プミルス、バチルス・コアグランス、クロストリジウム・スポロゲネス、バチルス・サブチリス・グロビジ、バチルス・セレウス、バチルス・サーキュランスの芽胞またはそれらの2またはそれ以上の混合物である、請求項7〜10のいずれか1に記載の方法。
- 前記芽胞が、少なくとも1つの試験生物と少なくとも1つの酵素を生産するために適したレポータ遺伝子を有し、該レポ−ター遺伝子が該試験生物に取り込まれる、遺伝的に操作された芽胞を含む、請求項7〜11のいずれか1に記載の方法。
- 前記方法が、着脱可能な気体および/または液体不透過性の膜を、少なくとも前記芽胞の上に適用されることをさらに含む、請求項7〜12のいずれか1に記載の方法。
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