JP6886514B2 - 質量分析測定および評価のための微生物試料および微生物の調製 - Google Patents
質量分析測定および評価のための微生物試料および微生物の調製 Download PDFInfo
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Description
Claims (23)
- 質量分析測定のための微生物試料を調製する方法であって、
(a)複数の試料スポットを含む試料支持台を設けるステップと、
(b)前記試料スポットの少なくとも1つの上に、少なくとも1つの生きた微生物試料を含む栄養培地の液滴を設置するステップと、
(c)前記試料支持台を既定の雰囲気を有する温置チャンバ内へ配置して所定の期間、微生物の生育を促進するステップと、
(d)前記所定の期間ののち、前記栄養培地の液滴の残留液体を除去して、前記試料スポット上の微生物の沈殿物を露出させるステップと、
(e)前記試料スポットを、脱離イオン化用に調製するステップと、
(f)質量分析計の脱離イオン源内へ前記試料支持台を移送し、前記調製した試料スポットからイオンを生成し、少なくとも1つの対応する質量スペクトルを取得するステップと、
(g)前記取得した質量スペクトルを基準データセットと比較して、前記微生物試料の少なくとも1つの特徴を判定するステップとを含む、方法。 - 前記基準データセットは、先に取得した質量スペクトルのライブラリから取られた基準スペクトルを有しており、ステップ(g)で判定される前記少なくとも1つの特徴は、前記微生物試料中の微生物の種または亜種に関する特徴を含む、請求項1に記載の方法。
- ステップ(b)において、前記栄養培地は、抗菌物質または抗菌物質および酵素阻害剤の組み合わせのいずれか1つを含む栄養培地と、いずれも含まない栄養培地とがあり、前記微生物試料の一部は、前記抗菌物質または抗菌物質および酵素阻害剤の組み合わせのいずれか1つを含む前記栄養培地の液滴とともに一部の試料スポットへ設置され、前記微生物試料の他の一部は、前記抗菌物質または抗菌物質および酵素阻害剤の組み合わせのいずれかも含まない前記栄養培地の液滴とともに、他の一部の試料スポットへ設置される、請求項1に記載の方法。
- 前記基準データセットは、抗菌物質も、抗菌物質および酵素阻害剤の組み合わせも含まない栄養培地の液滴において得られた微生物の沈殿物について取得された質量スペクトルであり、
ステップ(g)からの前記少なくとも1つの特徴は、前記抗菌物質または前記抗菌物質と酵素阻害剤との組み合わせに対する、前記微生物試料における微生物の感受性を含む、請求項3に記載の方法。 - ステップ(b)において、それぞれが異なる濃度の抗菌物質を含む各栄養培地の液滴が前記複数の試料スポットの各々に設置され、ステップ(g)からの前記少なくとも1つの特徴を判定することは、前記微生物に対する前記抗菌物質の最小発育阻止濃度を決定すること含む、請求項1に記載の方法。
- ステップ(g)における前記少なくとも1つの特徴は、前記微生物の生育における相違から導出される、請求項1に記載の方法。
- ステップ(b)における前記微生物試料は、その量が前記質量分析測定の検出限界をわずかに下回るよう、前記栄養培地の液滴に含まれる、請求項1に記載の方法。
- ステップ(d)における前記残留液体の除去は、吸収性の材料により前記残留液体を拭い取ること、または、それをピペットで取り去ることを含む、請求項1に記載の方法。
- 前記残留液体を除くことにより、液滴の浮遊物も除去される、請求項8に記載の方法。
- ステップ(b)において、前記微生物試料は、(i)前記少なくとも1つの試料スポット上で、前記栄養培地の液滴中の懸濁液として用意され、または、(ii)まず、前記少なくとも1つの試料スポット上で、細胞の形態で設置され、続いて、投与された栄養培地の液滴へと浸漬される、請求項1に記載の方法。
- 質量分析測定用の微生物試料を調製するための方法であって、
(a)複数の試料スポットを含む試料支持台を設けるステップと、
(b)前記試料支持台から離れた栄養培地中で培養された微生物を、前記栄養培地の液滴の状態で、前記試料支持台の少なくとも1つの前記試料スポット上に設置するステップと、
(c)前記栄養培地の液滴中の微生物が前記試料スポット上に堆積されるよう、所定の休止期間、前記試料支持台を維持するステップと、
(d)前記所定の休止期間ののち、前記栄養培地の液滴の残留液体を除去して、前記微生物の沈殿物を露出させるステップと、
(e)前記試料スポットを、脱離イオン化用に調製するステップと、
(f)質量分析計の脱離イオン源内へ前記試料支持台を移送し、前記調製した試料スポットからイオンを生成し、少なくとも1つの対応する質量スペクトルを取得するステップと、
(g)前記取得した質量スペクトルを基準データセットと比較して、前記微生物の少なくとも1つの特徴を判定するステップとを含む、方法。 - 前記基準データセットは、先に取得した質量スペクトルのライブラリから取られた基準スペクトルを有しており、ステップ(g)からの前記少なくとも1つの特徴は、前記微生物の種または亜種に関する特徴を含む、請求項11に記載の方法。
- 前記微生物は、ステップ(b)において前記試料スポットに設置される前に、前記試料支持台から離れた少なくとも1つの容器において、液体栄養培地中で培養され、そこから前記試料スポットへと移送される、請求項11に記載の方法。
- ステップ(b)において、前記微生物試料の一部は、抗菌物質または抗菌物質および酵素阻害剤の組み合わせのいずれか1つを含む栄養培地に添加されて培養され、前記微生物試料の他の一部は、前記抗菌物質または抗菌物質および酵素阻害剤の組み合わせのいずれも含まない栄養培地に添加されて培養される、請求項11に記載の方法。
- 前記基準データセットは、抗菌物質も、抗菌物質および酵素阻害剤の組み合わせも含まない液体栄養培地を起源とする微生物の沈殿物のある試料スポットについて取得された質量スペクトルであり、ステップ(g)からの前記少なくとも1つの特徴は、前記抗菌物質または抗菌物質と酵素阻害剤との組み合わせに対する、前記微生物の感受性を含む、請求項14に記載の方法。
- 前記微生物は、それぞれ異なる濃度で抗菌物質を含む液体栄養培地を収容した各容器において培養され、ステップ(g)からの前記少なくとも1つの特徴を判定することは、前記微生物に対する、前記抗菌物質の最小発育阻止濃度を決定すること含む、請求項11に記載の方法。
- ステップ(g)における前記少なくとも1つの特徴は、前記微生物の生育における相違から導出される、請求項11に記載の方法。
- 前記微生物は、その量が前記質量分析測定の検出限界をわずかに下回るよう、前記培養の開始時に前記栄養培地に含まれる、請求項11に記載の方法。
- ステップ(c)における前記所定の休止期間は、10〜60分の間である、請求項11に記載の方法。
- ステップ(d)における前記試料支持台からの前記残留液体の除去は、吸収性の材料により前記残留液体を拭い取ること、または、それをピペットで取り去ることを含む、請求項11に記載の方法。
- 前記残留液体を除くことにより、液滴の浮遊物も除去される、請求項20に記載の方法。
- 前記微生物試料は、(i)前記液体栄養培地中の懸濁液として、前記容器内へと投与され、または、(ii)まず、細胞の形態で前記容器内に設置され、その後、液体栄養培地が添加される、請求項13に記載の方法。
- 微量滴定プレート中のウェルが、前記微生物の培養のための容器として使用される、請求項11〜請求項22のいずれか1項に記載の方法。
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