JP7401136B2 - サンプル系における微量タンパク質の検出方法 - Google Patents
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Description
被検出タンパク質の一次抗体で修飾された免疫磁気ビーズと二次抗体で修飾されたナノ粒子を提供することと、
上記一次抗体で修飾された免疫磁気ビーズ及び二次抗体で修飾されたナノ粒子を上記被検出タンパク質を有するサンプル系と結合してインキュベートし、ダブルアンチサンドイッチ構造複合体を形成することと、
上記複合体を単一粒子の形態でマイクロナノポア装置を通過して電気パルス信号をトリガーし、上記電気パルス信号を分析して上記複合体の電荷状態又は体積/質量状態を取得し、上記電荷状態又は体積/質量状態によって上記サンプル系における被検出タンパク質数を算出することと、を含む。
粒子表面電位ξと電気移動度μとは以下のような対応関係があり、
且つ、粒子表面電位ξの式は次のとおりである:
被検出タンパク質の一次抗体で修飾された免疫磁気ビーズと二次抗体で修飾されたナノ粒子を提供することと、
一次抗体で修飾された免疫磁気ビーズと二次抗体で修飾されたナノ粒子を被検出タンパク質を有するサンプル系と結合してインキュベートし、ダブルアンチサンドイッチ構造複合体を形成することと、
ダブルアンチサンドイッチ構造複合体を単一粒子の形態でマイクロナノポア装置に通過して電気パルス信号をトリガーし、電気パルス信号を分析して複合体の電荷状態又は体積/質量状態を取得し、電荷状態又は体積/質量状態によってサンプル系における被検出タンパク質数を算出すること。
且つ、粒子表面電位ξの式は次のとおりである:
Claims (6)
- サンプル系における微量タンパク質の検出方法であって、
前記方法は、
被検出タンパク質の一次抗体で修飾された免疫磁気ビーズと二次抗体で修飾されたナノ粒子を提供することと、
前記一次抗体で修飾された免疫磁気ビーズ及び二次抗体で修飾されたナノ粒子を前記被検出タンパク質を有するサンプル系と結合してインキュベートし、ダブルアンチサンドイッチ構造複合体を形成することと、
前記複合体を単一粒子の形態でマイクロナノポア装置を通過して電気パルス信号をトリガーし、前記電気パルス信号を分析して前記複合体の電荷状態又は体積/質量状態を取得し、前記電荷状態又は体積/質量状態によって前記サンプル系における被検出タンパク質数を算出することと、
前記電気パルス信号は、前記複合体の電荷状態を反映し、前記電気パルス信号のピーク変動を分析することによって、前記複合体における結合された前記ナノ粒子の状態及び/又は数を取得し、前記状態及び/又は数とダブルアンチサンドイッチ構造の反応原理によって、前記サンプル系における被検出タンパク質数を算出することと、
前記体積/質量状態と前記電気パルス信号の積分面積とは正の相関にあり、前記複合体におけるタンパク質捕捉数は、前記免疫磁気ビーズに対する前記複合体の体積/質量増分に比例し、前記電気パルス信号の積分面積と前記複合体におけるタンパク質捕捉数との標準曲線の関係から、前記複合体におけるタンパク質捕捉数を推算し、更に前記サンプル系における被検出タンパク質数を算出することと、を含み、
前記マイクロナノポア装置は、マイクロポア付きの二重膜構造装置であり、当該装置は、所定間隔距離を有するマイクロポア付きの二重ナノフィルムを含み、二重ナノフィルムにおけるマイクロポアは対向して前記ナノフィルム両側のチャンバを連通し、前記チャンバに電解液が充填され、しかも両側のチャンバにそれぞれイオンの伝送を維持するための電極が配置され、前記複合体が単一粒子の形態で2つのマイクロポアを連続的に通過する間に時間間隔を有する電気パルス信号のペアを生成し、
前記複合体の電気パルス信号に対し、電気移動度を算出することによって複合体の粒子表面電位を取得する、ことを特徴とするサンプル系における微量タンパク質の検出方法。 - 前記方法は、抗体修飾反応に適する溶液系において、前記一次抗体を免疫磁気ビーズ表面の官能基と共有結合して前記一次抗体で修飾された免疫磁気ビーズを取得することを更に含む、ことを特徴とする請求項1に記載の検出方法。
- 前記溶液系における前記一次抗体と前記免疫磁気ビーズとの濃度比を調整することによって、前記免疫磁気ビーズ表面における前記一次抗体の修飾程度を調整する、ことを特徴とする請求項2に記載の検出方法。
- 前記免疫磁気ビーズの粒子径は、少なくとも前記ナノ粒子の1~1000倍である、ことを特徴とする請求項1に記載の検出方法。
- 前記免疫磁気ビーズの粒子径は100nm~10μmであり、前記ナノ粒子の粒子径は1μm未満である、ことを特徴とする請求項1に記載の検出方法。
- 前記電気移動度は、次の式によって算出し、
粒子表面電位ξと電気移動度μとは以下のような対応関係があり、
且つ、粒子表面電位ξの式は次のとおりである:
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JP2023507037A (ja) | 2023-02-20 |
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WO2021120943A1 (zh) | 2021-06-24 |
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