JP3991034B2 - 検出方法 - Google Patents
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Description
前記検体に含まれる第一の物質を特異的に捕捉する第一の物質捕捉体が固定された第一の物質捕捉部と、前記検体に含まれ前記第一の物質とは異なる第二の物質を特異的に捕捉する第二の物質捕捉体が固定された第二の物質捕捉部と、流路と、を有する検出素子に前記検体を流す工程と、
前記第一の標的物質捕捉体が固定された前記第一の物質捕捉部および前記第二の標的物質捕捉体が固定された前記第二の物質捕捉部に標識を含む溶液を流す工程と、
前記第一の物質捕捉部に流れる第一の流れの層と前記第二の物質捕捉部に流れる第二の流れの層とを同時に存在させた状態で、前記第一の流れの層に前記第一の物質捕捉部に固定された標識からの信号を発生させるための溶液を流す工程と、前記第一の物質捕捉部からの信号を得る工程と、
前記第一の物質捕捉部に流れる前記第一の流れの層と前記第二の物質捕捉部に流れる前記第二の流れの層とを同時に存在させた状態で、前記第二の流れの層に前記第二の物質捕捉部に固定された標識からの信号を発生させるための溶液を流す工程と、
前記第二の物質捕捉部からの信号を得る工程と、
をこの順に有することを特徴とする検出方法である。
前記検体中の複数の異なる物質は標識を有し、前記複数の流れの層を流れる流体は前記標識と作用することにより作用物を放出させるための流体であることが好ましい。
前記標識が触媒作用を有する物質、電気化学的に発光する物質または蛍光物質であることが好ましい。
本発明の検出方法に用いられる検出素子は、検体中の複数の異なる物質を検出するための検出素子であって、基体に設けられ、流体の流れの層(以降、層状流と記す)を複数形成可能な流路と、前記物質を特異的に捕捉するために前記流路中に設けられた、複数の異なる物質捕捉部とを備え、前記物質捕捉部は、前記層状流の一方の層を流れる流体を切り替えることにより、前記物質に対する独立の情報が得られるように配置されていることを特徴とする。
物質捕捉部は、流路の複数の層状流の一方を流れる流体を切り替えることにより、物質に対する独立の情報が得られるように配置されている。ここで、層状流の一方の層を流れる流体とは、検体中に含まれる物質の有する標識と作用することにより、作用物を放出させるための流体(基質)であり、その放出された作用物を検出することにより物質捕捉部に捕捉された検体中の物質の量等の情報を得ることができる。
検体中の物質の検出については、例えば、物質捕捉部に捕捉された検体と、物質特異的な2次抗体に酵素標識したものとの複合体を形成せしめ、物質捕捉部ごとに層状流を流れる流体を用いて酵素標識と作用する酵素基質を選択的に供給し、生成した酵素反応生成物(作用物)を物質捕捉部の下流に位置する検出用電極により検出する。
また、物質捕捉部に形成せしめる複合体は、触媒標識された2次捕捉体の他に、検体と2次捕捉体との複合体に対して特異的に結合する3次以降の触媒標識抗体でもよい。
触媒作用を有する物質としては、グルコース酸化酵素、コリン酸化酵素、ラクトース酸化酵素、西洋ワサビペルオキシダーゼが挙げられる。それぞれ、基質として、グルコース、コリン、ラクトース、ルミノールと過酸化水素が挙げられる。電気化学発光物質としては、トリス(ビピリヂル)ルテニウムが挙げられる。蛍光標識物質としては、5−カルボキシフルオレセイン、Quene−1(8−アミノ−2−(トランス−2−アミノスチリル)−6−メトキシキノリン−N,N,N’,N’−テトラ酢酸テトラナトリウム塩)、BCECF(2’,7’−ビス(カルボキシエチル)−4または5−カルボキシフルオレセイン)が挙げられる。
実施例1
図1は、本発明の一実施の形態におけるバイオセンサの構造を示すものである。ここでは、触媒作用を有する物質として、グルコース酸化酵素(GOX)を用いる。また、測定対象とする検体として、ヒトαフェトプロテイン(AFP)及びヒトβ2マイクログロブリン(β2MG)を用いる。
図7のような構造のバイオセンサを作製する。基板としてガラス基板を用いる。図9に示すような幅100μm、深さ50μm微小流路48をウェットエッチング法により形成する。実施例1に於いて形成した層状流を更に厳密に検出し、基質の拡散を抑制し、物質捕捉部をより近接して形成できるようにする。これにより更なる物質捕捉部の高密度化が可能となる。
実施例1、2にある系において、酵素標識の代替として、蛍光標識用いることができる。
層状流により流体のpHを特定の1層のみ変更し、蛍光標識の蛍光特性が変化することで、被検体の区別が可能となる。特定波長における蛍光強度あるいは蛍光スペクトルの変化を検出する。3次抗体の標識としてpH感受性蛍光色素5−カルボキシフルオレセインを用いて、実施例2と同様の検出が可能となる。
3 ドレイン
4,5,6 電極パッド
7 基板
9 微小流路
10、11 物質捕捉部
13 PDMS基板
14 微小流路
15 ガラス基板
16,17,18 薄膜電極
19,20,21 電極パッド
22,23,24 貫通孔
32,33,34 電極パッド
35 微小流路
36、37、38 インレット
39 ドレイン
40 基板
42,43 物質捕捉部
44、45 界面
46 疎水化処理部
47 基板
48 微小流路
49 ガラス基板
50、51、52、53 貫通孔
71、72 層状流
Claims (3)
- 検体に含まれる複数の異なる物質を同一の標識を用いて検出する検出方法であって、
前記検体に含まれる第一の物質を特異的に捕捉する第一の物質捕捉体が固定された第一の物質捕捉部と、前記検体に含まれ前記第一の物質とは異なる第二の物質を特異的に捕捉する第二の標的物質捕捉体が固定された第二の物質捕捉部と、流路と、を有する検出素子に前記検体を流す工程と、
前記第一の標的物質捕捉体が固定された前記第一の物質捕捉部および前記第二の標的物質捕捉体が固定された前記第二の物質捕捉部に標識を含む溶液を流す工程と、
前記第一の物質捕捉部に流れる第一の流れの層と前記第二の物質捕捉部に流れる第二の流れの層とを同時に存在させた状態で、前記第一の流れの層に前記第一の物質捕捉部に固定された標識からの信号を発生させるための溶液を流す工程と、前記第一の物質捕捉部からの信号を得る工程と、
前記第一の物質捕捉部に流れる前記第一の流れの層と前記第二の物質捕捉部に流れる前記第二の流れの層とを同時に存在させた状態で、前記第二の流れの層に前記第二の物質捕捉部に固定された標識からの信号を発生させるための溶液を流す工程と、
前記第二の物質捕捉部からの信号を得る工程と、
をこの順に有することを特徴とする検出方法。 - 前記標識が酵素であり、前記標識からの信号を発生させるための溶液が前記酵素の基質を含む溶液であることを特徴とする請求項1に記載の検出方法。
- 前記標識がpH感受性蛍光色素であり、前記標識からの信号を発生させるための溶液が前記pH感受性蛍光色素の蛍光特性が変化するpHの溶液であることを特徴とする請求項1に記載の検出方法。
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PCT/JP2005/000811 WO2005071393A2 (en) | 2004-01-23 | 2005-01-18 | Detecting element and detection method |
EP05709265A EP1711827B1 (en) | 2004-01-23 | 2005-01-18 | Detecting element and detection method |
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