JPWO2017134746A1 - 送液方法、ならびにこれを行う検出システムおよび検出装置 - Google Patents
送液方法、ならびにこれを行う検出システムおよび検出装置 Download PDFInfo
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Abstract
上述した目的のうち、少なくとも一つを実現するために、微細流路と、前記微細流路の一端に接続された液体注入部と、前記微細流路の他端に接続された貯留部とを有する検出用チップの液体注入部にピペットチップを挿入し、ピペットチップにて液体を注入および吸引し、微細流路内に液体を往復送液する方法とする。このとき、ピペットチップを、液体注入部内に液体を注入した際に、ピペットチップの先端が液面より下方となる位置まで、液体注入部に挿入する工程と、ピペットチップから液体注入部内に液体を注入する工程と、液体注入部内に負圧を生じさせ、液体注入部内の液体の液面の高さを上昇させる工程と、ピペットチップにより液体注入部内の液体を吸引する、もしくはピペットチップにより液体注入部に液体を注入及び液体注入部内の液体を吸引する工程と、をこの順に行う。
Description
図1に示すように、本実施形態の検出チップ10は、入射面21、成膜面22、および出射面23を有するプリズム20と、プリズム20の成膜面22に形成された金属膜30と、プリズム20の成膜面22または金属膜30上に配置された流路蓋40とを有する。図1とは別の角度の検出チップ10の縦断面図を図2に示す。図2に示すように、流路蓋40は、金属膜30と対向する面に凹部を有する。そして、金属膜30と、流路蓋40とで囲まれた空間が、液体500(例えば検体)を往復送液させるための微細流路41、液体500を注入するための液体注入部3101、および液体500を一時的に貯留するための貯留部3102となる。
また、微細流路41の幅や高さは特に制限されず、検出チップ10の用途などに応じて適宜選択される。
次に上記検出チップ10に各種液体500を送液する方法を説明する。図4は、本実施形態の検出方法を行う際のSPFS装置100の動作手順の一例を示すフローチャートである。また、図5Aに、本実施形態の送液方法を行った際の時間経過(横軸)と、液体注入部3101内の圧力(縦軸)との関係を示す。なお、図5Aの縦軸の値は、ピペットチップ挿入時の液体注入部3101内の圧力を基準(0kPa)としたときの差圧である。
続いて、前述の検出装置(検出システム)を用いた被検出物質の検出方法を説明する。図6は、本実施形態の検出方法を行う際のSPFS装置100の動作手順の一例を示すフローチャートである。
上述の送液方法では、液体注入部3101内に負圧を発生させる工程(工程S130)において、ピペットチップ134を軸方向上方に移動させることで、負圧を発生させる形態を説明したが、流路蓋40の液体注入部被覆シート3111を変形させるなど、他の方法により液体注入部3101に負圧を発生させることもできる。
前述のように、通常の送液方法で各種液体を微細流路に往復送液すると、液体の吸引時にピペットチップ内に気泡が入り込みやすく、ピペットチップから液体を再度微細流路内に供給すると、液体と共に気泡が微細流路内に入り込みやすい。そして、微細流路内に気泡が入り込むと、被検出物質の検出精度等が低下しやすい。これに対し、本実施形態の送液方法で、各種液体を微細流路内に往復送液すると、液体の吸引時に気泡が入り込み難く、再度液体を供給しても、微細流路に空気が入り込み難い。したがって、被検出物質を精度良く検出することなどが可能となる。
20 プリズム
21 入射面
22 成膜面
23 出射面
30 金属膜
40 流路蓋
41 微細流路
100 SPFS装置
110 励起光照射ユニット
111 光源ユニット
112 角度調整機構
113 光源制御部
120 蛍光検出ユニット
121 受光ユニット
122 位置切替え機構
123 センサー制御部
124 第1レンズ
125 光学フィルター
126 第2レンズ
127 受光センサー
130 送液ユニット
131 液体チップ
132 シリンジポンプ
133 送液ポンプ駆動機構
134 ピペットチップ
135 プランジャー
140 搬送ユニット
141 搬送ステージ
142 チップホルダー
150 制御部
500 液体
3101 液体注入部
3102 貯留部
3110 枠体
3111 液体注入部被覆シート
3112 貯留部被覆シート
α 励起光
β 蛍光
γ プラズモン散乱光
Claims (5)
- 微細流路と、前記微細流路の一端に接続され、液体を注入するための液体注入部と、前記微細流路の他端に接続され、液体を一時的に貯留するための貯留部と、を有する検出用チップの前記液体注入部に、前記液体注入部が密閉状態となるようにピペットチップを挿入し、前記ピペットチップにて液体を注入および吸引し、前記微細流路内に液体を往復送液する送液方法であって、
前記ピペットチップを、前記液体注入部内に液体を注入した際、前記ピペットチップの先端が液面より下方となる位置まで、前記液体注入部に挿入する工程と、
前記ピペットチップから前記液体注入部内に液体を注入する工程と、
前記液体注入部内に負圧を生じさせ、前記液体注入部内の液体の液面の高さを上昇させる工程と、
前記ピペットチップにより前記液体注入部内の液体を吸引する、もしくは前記ピペットチップにより前記液体注入部に液体を注入及び前記液体注入部内の液体を吸引する工程と、をこの順に行う、
送液方法。 - 前記液体注入部内の液体の液面の高さを上昇させる工程では、前記ピペットチップを軸方向に上昇させて、前記液体注入部内に負圧を生じさせる、
請求項1に記載の送液方法。 - 前記液体注入部の内径が10mm以下であり、かつ前記ピペットチップの外径が1mm以上10mm未満である、
請求項1または2に記載の送液方法。 - 微細流路と、前記微細流路の一端に接続され、液体を注入するための液体注入部と、前記微細流路の他端に接続され、液体を一時的に貯留するための貯留部とを有する検出用チップと、
前記液体注入部内に液体を注入、および前記液体注入部から液体を吸引するためのピペットチップと、
前記ピペットチップによる液体の注入および吸引を制御するための送液ポンプ駆動機構と、
を有する検出システムであり、
前記ピペットチップは、前記液体注入部内が密閉状態となり、かつ前記ピペットチップの先端が前記液体注入部内に注入する液体の液面より下方となるように挿入され、
前記送液ポンプ駆動機構は、前記ピペットチップから前記液体注入部に液体を注入後、前記液体注入部内の密閉状態を維持した状態で、前記ピペットチップを軸方向に上昇させることで、前記液体注入部内の液体の液面の高さを上昇させ、前記ピペットチップにより前記液体注入部内の液体を吸引する、もしくは前記ピペットチップにより前記液体注入部に液体を注入及び前記液体注入部内の液体を吸引する、
検出システム。 - 微細流路と、前記微細流路の一端に接続され、液体を注入するための液体注入部と、前記微細流路の他端に接続され、液体を一時的に貯留するための貯留部とを有する検出用チップを装着可能なチップホルダーと、
前記チップホルダーに保持された前記検出用チップの前記液体注入部内に液体を注入、および前記液体注入部から液体を吸引するためのピペットチップと、
前記ピペットチップによる液体の注入および吸引を制御するための送液ポンプ駆動機構と、
を有し、
前記ピペットチップは、前記液体注入部内が密閉状態となり、かつ前記ピペットチップの先端が前記液体注入部内に注入する前記液体の液面より下方となるように挿入され、
前記送液ポンプ駆動機構は、前記ピペットチップから前記液体注入部に液体を注入後、前記液体注入部内の密閉状態を維持した状態で、前記ピペットチップを軸方向に上昇させることで、前記液体注入部内の前記液体の液面の高さを上昇させ、前記ピペットチップにより前記液体注入部内の液体を吸引する、もしくは前記ピペットチップにより前記液体注入部に液体を注入及び前記液体注入部内の液体を吸引する、
検出装置。
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