JP2023138902A - 薄膜培養デバイスにおける大腸菌の迅速な検出 - Google Patents
薄膜培養デバイスにおける大腸菌の迅速な検出 Download PDFInfo
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Abstract
Description
本出願は、2017年4月3日に出願された米国特許仮出願第62/480,630号の優先権を主張するものであり、その開示の全容が本明細書に参照により組み込まれる。
食品及び飲料の安全性試験において、大腸菌群(coliform)の細菌が存在するかしないかは、重要な品質証拠であると考えられる。飲料及び特定の食品(例えば、乳製品)において許容される大腸菌群の細菌の量は、世界中の多くの国で規制されている。大腸菌群の細菌としては、大腸菌(Escherichia coli)などの糞便性大腸菌群が挙げられる。食品又は水試料中の糞便性大腸菌群の存在は、食品又は水の糞便汚染の主要な指標として、及び他の病原性微生物の存在の可能性の指標として使用される。
Association,Washington,D.C.により出版されているStandard Methods for the Examination of Dairy Products,27.sup.th Edition、及びU.S.Food and Drug Administration,Washington,D.C.により出版されているBacteriological Analytical Manual(「BAM」)が挙げられる。固形食品は、通常、水性媒体中に懸濁され、混合及び/又は粉砕されて、食品材料の液体ホモジネートを得ることができ、これは、定量的微生物分析の方法で使用することができる。
実施形態Aは、大腸菌群及び大腸菌(Escherichia coli)微生物のコロニーを別個に計数するためのデバイスであって、
水不透過性の第1のシートと、
第1のシートに取り付けられた水不透過性の第2のシートと、
第1のシートに接着された乾燥した再水和可能な培養培地であって、
培養培地が、
大腸菌群微生物の増殖を促進する有機窒素系栄養素と、
D-ラクトース、β-ガラクトシダーゼの産生を増強する第1の誘導因子化合物、及びpH指示薬を含む、ラクトース発酵指示薬系と、
5-ブロモ-4-クロロ-3-インドリル-β-D-グルクロニド、及び大腸菌中のβ-グルクロニダーゼ活性を増強する少なくとも1つの化合物を含む、β-D-グルクロニダーゼ指示薬系と、
レドックス指示薬と、
非大腸菌群微生物の増殖を選択的に阻害する有効量の少なくとも1つの薬剤と、
第1の冷水可溶性ゲル化剤と、を含む培養培地と、
第1のシートと第2のシートとの間に配置された微生物増殖ゾーンであって、第1のシートに接着された培養培地の領域が、増殖ゾーンを画定する、微生物増殖ゾーンと、
第2のシートに接着された第2の冷水可溶性ゲル化剤と、を含み、
第1のシートは、培養培地が第2の冷水可溶性ゲル化剤に面するように、第2のシートに取り付けられており、
第1のシート及び第2のシートは、それを通る二酸化炭素の通過を遅らせるように構成されている、デバイスである。
本開示の培養デバイスの任意の実施形態の微生物増殖ゾーン内の試料及び水性液体を接触させて、接種済み培養デバイスを形成することと、
接種済み培養デバイスを35℃~45℃の温度で一定時間インキュベートすることと、
微生物増殖ゾーンを細菌のコロニーについて観察することと、
細菌のコロニーに隣接する微生物増殖ゾーンを観察して、コロニーの周辺部に隣接する酸ゾーンの指標を検出することと、
細菌のコロニー及び細菌のコロニーに隣接する微生物増殖ゾーンを観察して、コロニー内又はコロニーの周辺部に隣接するβ-グルクロニダーゼ活性の指標を検出することと、
ベータグルクロニダーゼ非産生細菌による、ホルマザンに対するTTC還元を観察することと、を含む、方法である。
Claims (23)
- 大腸菌群及び大腸菌(Escherichia coli)微生物のコロニーを別個に計数するためのデバイスであって、前記デバイスが、
水不透過性の第1のシートと、
前記第1のシートに取り付けられた水不透過性の第2のシートと、
前記第1のシートに接着された乾燥した再水和可能な培養培地であって、前記培養培地が、
大腸菌群微生物の増殖を促進する有機窒素系栄養素と、
D-ラクトース、β-ガラクトシダーゼの産生を増強する第1の誘導因子化合物、及びpH指示薬を含む、ラクトース発酵指示薬系と、
5-ブロモ-4-クロロ-3-インドリル-β-D-グルクロニド、及び大腸菌中のβ-グルクロニダーゼ活性を増強する少なくとも1つの化合物を含む、β-D-グルクロニダーゼ指示薬系と、
レドックス指示薬と、
非大腸菌群微生物の増殖を選択的に阻害する有効量の少なくとも1つの薬剤と、
第1の冷水可溶性ゲル化剤と、を含む培養培地と、
前記第1のシートと前記第2のシートとの間に配置された微生物増殖ゾーンであって、前記第1のシートに接着された前記培養培地の領域が、前記増殖ゾーンを画定する、微生物増殖ゾーンと、
前記第2のシートに接着された第2の冷水可溶性ゲル化剤と、を含み、
前記第1のシートは、前記培養培地が前記第2の冷水可溶性ゲル化剤に面するように、前記第2のシートに取り付けられており、
前記第1のシート及び前記第2のシートは、それを通る二酸化炭素の通過を遅らせるように構成されている、デバイス。 - 前記微生物増殖ゾーン内に配置されたD-グルクロン酸を更に含む、請求項1に記載のデバイス。
- 前記第1のシートが、ポリエステルフィルムを含む、請求項1又は2に記載のデバイス。
- 前記第2のシートが、ポリエステルフィルムを含む、請求項1~3のいずれか一項に記載のデバイス。
- 前記第2のシートが、ポリエチレンテレフタレートを含む、請求項4に記載のデバイス。
- 前記増殖ゾーンが、前記第1のシートに接着されたスペーサによって画定される、請求項1~5のいずれか一項に記載のデバイス。
- 前記冷水可溶性ゲル化剤が、グアーガムを含む、請求項1~6のいずれか一項に記載のデバイス。
- 前記第1のシートに接着された前記培養培地が、約130mg/100cm2~約195mg/100cm2のコーティング重量を有する、請求項1~7のいずれか一項に記載のデバイス。
- ラクトースが、前記第1のシートに接着された前記乾燥培養培地中に配置され、前記ラクトースが、前記乾燥培養培地中に、約8.5mg/100cm2~約27mg/100cm2のコーティング重量で存在する、請求項1~8のいずれか一項に記載のデバイス。
- 前記培養培地が、水性液体で再構成されたときに、前記培養培地を約6.5~約7.5のpHに緩衝するための試薬を更に含む、請求項1~9のいずれか一項に記載のデバイス。
- 前記pH指示薬が、スルホンフタレインpH指示薬を含む、請求項1~10のいずれか一項に記載のデバイス。
- 前記pH指示薬が、クロロフェノールレッド及びフェノールレッドからなる群から選択される、請求項11に記載のデバイス。
- 前記有機窒素系栄養素が、酵母エキス、ブタペプトン、ゼラチンの酵素消化物、動物性ペプトンの酵素消化物、及び前述の有機窒素系栄養素のうちの任意の2つ以上の組み合わせからなる群から選択される、請求項1~12のいずれか一項に記載のデバイス。
- 前記増殖ゾーンが、約1ミリリットル~約5ミリリットルの所定の体積を有する水性液体を受容するように構成され、前記所定の体積を受容すると、大腸菌群コロニーの増殖を促進し計数を助ける水和培養培地を形成する、請求項1~13のいずれか一項に記載のデバイス。
- 前記薬剤が、胆汁塩、ドデシル硫酸ナトリウム、及びこれらの組み合わせからなる群から選択される、請求項1~14のいずれか一項に記載のデバイス。
- 前記第2の冷水可溶性ゲル化剤が、乾燥粒子又は乾燥凝集粒子の形態で前記第2のシート上に配置されている、請求項1~15のいずれか一項に記載のデバイス。
- β-ガラクトシダーゼの産生を増強する前記第1の誘導因子化合物が、イソプロピル-β-D-チオガラクトピラノシドを含む、請求項1~16のいずれか一項に記載のデバイス。
- β-グルクロニダーゼ酵素活性の産生を増強する前記第1の誘導因子化合物が、メチル-β-D-グルクロニドを含む、請求項1~17のいずれか一項に記載のデバイス。
- 前記β-D-グルクロニダーゼ指示薬系が、大腸菌中のβ-グルクロニダーゼ酵素活性を増強する複数の化合物を含む、請求項1~18のいずれか一項に記載のデバイス。
- 大腸菌中のβ-グルクロニダーゼ酵素活性を増強する前記複数の化合物のうちの第1の化合物が、メチル-β-D-グルクロニド及びフェニル-β-D-グルクロニドから選択される、請求項19に記載のデバイス。
- 大腸菌中のβ-グルクロニダーゼ酵素活性を増強する前記複数の化合物のうちの第2の化合物が、D-グルクロン酸である、請求項19又は請求項20に記載のデバイス。
- 前記微生物増殖ゾーン内に配置された乾燥乳児用調整粉乳を更に含む、請求項1~21のいずれか一項に記載のデバイス。
- 前記レドックス指示薬が、テトラゾリウムクロリドである、請求項1~22のいずれか一項に記載のデバイス。
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JP2020512831A (ja) | 2020-04-30 |
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CN110475869B (zh) | 2024-01-16 |
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WO2018187195A1 (en) | 2018-10-11 |
CN110475869A (zh) | 2019-11-19 |
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