JP2010506191A - 試薬層を有した高速バイオセンサ - Google Patents
試薬層を有した高速バイオセンサ Download PDFInfo
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- JP2010506191A JP2010506191A JP2009531965A JP2009531965A JP2010506191A JP 2010506191 A JP2010506191 A JP 2010506191A JP 2009531965 A JP2009531965 A JP 2009531965A JP 2009531965 A JP2009531965 A JP 2009531965A JP 2010506191 A JP2010506191 A JP 2010506191A
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Abstract
Description
Lは層の厚さ(単位:m)、Dは流体内のラベルの拡散係数(単位:m2・s−1)、さらに、Tbは層の拡散時間であり、それによって、容易さのために、表面の存在による増加した摩擦は無視される。例えば、水溶性流体内の直径が300nmのナノ粒子等のラベルは、一般的に、10−12m2・s−1程度の拡散係数Dを有している場合がある。3.2μmの層の厚さLで、見積もられた拡散時間Tbは約10秒である。これから、バースト時間Tbは距離の二乗に依拠していることが明らかになり、より短い検出時間を得たい場合に非常に薄い層を使用することの重要性を強調している。
dp/dt=Kon・〔T〕
により与えられる。
Konは捕獲プローブに対する標的分子の結合における結合定数(単位:L・mol−1s−1)であり、〔T〕は流体内の標的濃度(単位:mol・L−1)である。例えば、薬物−抗体結合に対するKon=105Lmol−1s−1及び〔T〕=100nmol・L−1は、dp/dt=0.01s−1を与える。これは、上記の選ばれたパラメータで標的−捕獲複合体は10s後に10%の可能性で形成されることを意味している。
dp/dt=Kon・〔T〕
により与えられる。
Konは抗体に対する薬物の結合における結合定数で、例えば、薬物−抗体結合に対して105Lmol−1s−1であり、〔T〕は流体内の薬物濃度で、例えば、100nmol・L−1は、dp/dt=0.01s−1を与える。これは、10s後に10%の可能性で抗体−薬物結合が形成されることを意味している。
dp/dt=Kon・〔E〕
により与えられる。
Konは変換定数で、例えば、106L・mol−1・s−1であり、〔E〕は試料流体内の酵素濃度で、例えば、100nmol・L−1は、dp/dt=0.1s−1を与える。これは、1s後に、10%の可能性で酵素基質が変換されることを意味している。試料流体内の酵素濃度〔E〕が例えば1μmol・L−1である場合、dp/dt=1s−1であり、100%近くの可能性で、1秒後に検出表面付近の酵素基質は変換されることを意味している。上記のように、試薬の急速な溶解及び拡散はバーストプロセスである。拡散が優勢な輸送機構である場合、適した層の厚さLは、
を通り透過することを意味する透過型バイオセンサでもあり得る。
(a)検出表面を有したセンサチップを提供するステップ、
(b)試薬を含んだ流体組成物に前記表面を接触させるステップであり、前記流体組成物が界面活性物質を本質的に含んでいない緩衝組成物である、ステップ、
(c)前記検出表面上に層を形成するために、反応物を有した前記緩衝組成物を乾燥させるステップ、
を含む。Tween等の界面活性物質を本質的に含んでいない乾燥用緩衝組成物の使用が、センサ表面に対する磁気粒子等の標的化合物の特異的結合を増加させることが意外にも判った。この状況において、界面活性物質を本質的に含まないとは、0.01%未満、より好ましくは0.001%未満の界面活性物質、より好ましくは0.0001%未満の界面活性物質を意味している。
MES saline buffer(25mM MES、150mM NaCl、2mM EDTA、0.05% Tween20 pH7.4)、ホウ酸緩衝液(50mM ホウ酸ナトリウム、0.05% Tween20、pH9)、Coating buffer(15mM 炭酸ナトリウム、35mM 炭酸水素ナトリウム、0.05%Na−アジド、pH9.6)、Drying buffer(50mM TRIS−HCl、1%/5%BSA、5%トレハロース/スクロース)、再分散緩衝液(50mM Tris−HCl、0.1%BSA、0.05%Tween20、pH8)、又は、(76mM Na2HPO4、4mM KH2PO4、400mM NaCl、アジド、0.1%TritonX405、pH8)。BSA−モルヒネ溶液(15mM Na2CO3中10μg/mL BSA−モルヒネ、35mM NaHCO3、0.03%NaN3、pH9.6)及び抗モルヒネ抗体1mg/mLは、Cozart Bioscience社(Oxfordshire、UK)により親切にも提供された。Carboxyl−Adembeads300nm及びStorage bufferをAdemtech社(Pessac、France)から購入した。EDC(N−3−ジメチルアミノプロピル−N−エチルカルボジイミドヒドロクロリド)及びNHS(N−ヒドロキシスクシンイミド)をPierce社(IL、USA)から購入した。
Cyclo Olefin Polymer(COP/Zeonex)、及び、約1.52の屈折率を有した透明プラスチックのポリスチレン射出成形基板上で実験を行った。水溶液は、表面の疎水性特徴を示す(90°を超える)高い接触角をこれらの基板上で示し、明確な溶液の位置づけを可能にしている。
磁気粒子濃縮装置(Dynal MPC−1、Magnetic Particle Concentrator、Dynal Biotech ASA社)を使用して、Carboxyl−Adembeads(Ademtech社)300nmの磁気粒子を1体積のMES saline bufferにおいて2回洗浄した。そのビーズを、10mg/mL(1%の固体重量)でMES saline bufferにおいて再懸濁した。カルボキシル基を活性化するために、H2Oにおいて1:1で混合された40mg/mL EDC及び40mg/mL NHSを用いて1000RPM(Thermomixer Comfort、Eppendorf、USA)で振盪しながら、ビーズを37℃で30分間インキュベートした。活性化されたビーズをMES saline bufferで1回、ホウ酸緩衝液で1回洗浄し、最終的に10mg/mLでホウ酸緩衝液において再懸濁した。結合前に、凝集を回避するために、ソニケータープローブ(VCX130、Sonics Vibra−Cell、Sonics&Materials,Inc.社、USA)を使用して、3回、40%の振幅で3秒間前記ビーズを超音波処理した。抗モルヒネ抗体を前記ビーズの溶液に2.8μg/mLで添加して、1000RPMで振盪しながら20℃でインキュベートし、その後、ソニケータープローブを使用して、3回、40%の振幅で3秒間超音波処理した。残りの活性カルボキシル基を不活性化するために、前記ビーズを、1000RPMで振盪しながら0.1Mグリシンを用いて20℃で30分間インキュベートした。被覆されたビーズを2時間ホウ酸緩衝液で洗浄し、次に、新たな試験管に移し、最後に2つの体積のStorage bufferで洗浄した。前記ビーズを、10mg/mLでStorage bufferにおいて4℃で貯蔵した。
表面被覆
4℃で加湿した環境において、ポリスチレン基板を一晩Coating buffer中10μ/mLのBSA−モルヒネ2μLで被覆した。インキュベーション後、前記表面を100μLのPBSで3回洗浄した後に風乾した。
乾燥処理
抗モルヒネ抗体に結合した磁気ビーズをボルテックスすることにより再懸濁し、一定分量をきれいな試験管に移した。磁気粒子濃縮装置を使用して、そのビーズをDrying bufferにおいて3回洗浄した。前記ビーズをDrying bufferにおいて2%の最終濃度で再懸濁し、そのうち1μLをBSA−モルヒネコーティングの上面に堆積させた。乾燥処理は、閉じた箱の中でシリカの袋を使用して一晩実行してきた。
再分散処理
乾燥した試薬を、13μLのアッセイ緩衝液を添加することにより再分散した。再分散後、結合処理を加速するために、センサ表面下の電磁石を使用して磁場を適用することにより磁気粒子を表面に結合させた。表面の上に配置された電磁石を使用して、非結合のビーズを表面から取り除いた。再分散処理、表面に対するMPの結合及び洗浄の後に、光学イメージングを続けた。
実験を、基板表面上に乾燥試薬の非常に薄い層を用いて、超高速モルヒネ競合アッセイ上で行った。これらの実験に対して、BSA−モルヒネで被覆したポリスチレン基板の上面で2%抗体-結合磁気粒子溶液を乾燥させた。
Claims (21)
- 少なくとも1つのセンサチップを有し、ラベル検出を可能にする少なくとも1つのラベルを受けるようされた、少なくとも1つの標的分子を検出するための検出システムであって、
前記少なくとも1つのセンサチップが、試薬を含んだ少なくとも第1の溶解可能な層を有する検出表面を含み、
前記少なくとも第1の溶解可能な層が、前記少なくとも1つのラベルの前記少なくとも1つの標的分子との相互作用を可能にし、従って、ラベルベースの検出信号の検出を可能にするようされる、検出システム。 - 少なくとも1つのラベルを検出するための検出器を含む、請求項1に記載の検出システム。
- 前記検出器が、磁気検出器若しくは光学検出器、又は、その組合せである、請求項2に記載の検出システム。
- 前記第1の溶解可能な層が1μmから50μmの厚さを有する、請求項1乃至3のいずれか1項に記載の検出システム。
- 前記センサチップが、該センサチップの前記検出表面上に固定化された捕獲プローブを提供する第2の層をさらに含む、請求項1乃至4のいずれか1項に記載の検出システム。
- 前記捕獲プローブが、前記少なくとも1つのラベル、又は、該少なくとも1つのラベルの前記少なくとも1つの標的分子との相互作用の結果の前記センサチップの検出表面上への固定化を可能にするようされる、請求項5に記載の検出システム。
- 前記センサチップが、較正試薬を提供する較正層を少なくとも1つさらに含み、前記較正層が、較正を可能にするようされた溶解可能な層である、請求項1乃至6のいずれか1項に記載の検出システム。
- 前記センサチップが、保護を与えるために前記少なくとも第1の溶解可能な層の上面に置かれた保護層をさらに含み、前記保護層は溶解可能な層である、請求項1乃至7のいずれか1項に記載の検出システム。
- 前記少なくとも1つのラベルが前記少なくとも第1の溶解可能な層内に含まれる、請求項1乃至8のいずれか1項に記載の検出システム。
- 操作システムを含む、請求項1乃至9のいずれか1項に記載の検出システム。
- 磁気操作手段を含む、請求項1に記載の検出システム。
- 前記検出表面への前記試料の到達時間を決定するセンサをさらに含む、請求項1乃至11のいずれか1項に記載の検出システム。
- 前記試料流体又はその一部の体積を測定するようされたセンサをさらに含む、請求項1乃至12のいずれか1項に記載の検出システム。
- 前記検出表面が多孔性の表面である、請求項1乃至13のいずれか1項に記載の検出システム。
- 前記少なくとも1つのラベルが標的特異的ラベルである、請求項1乃至14のいずれか1項に記載の検出システム。
- 試料内の少なくとも1つの標的分子を検出する方法であって:
試薬を含んだ少なくとも第1の溶解可能な層を有した検出表面を有するセンサチップと試料を接触させるステップ、
前記検出表面の前記少なくとも第1の溶解可能な層と前記試料流体との相互作用を可能にし、従って、少なくとも1つのラベルの前記少なくとも1つの標的分子との相互作用を可能にするステップ、及び
ラベルベースの検出信号を検出するステップ、
を含む方法。 - 操作ステップをさらに含む、請求項16に記載の方法。
- ラベル検出を可能にするために少なくとも1つのラベルを受けるようされ、試薬を含んだ少なくとも第1の溶解可能な層を有する検出表面を含む、試料内の少なくとも1つの標的分子を検出するためのセンサチップであって、
前記少なくとも第1の溶解可能な層が、前記少なくとも1つのラベルの前記少なくとも1つの標的分子との相互作用を可能し、従って、ラベルベースの検出信号の検出を可能にするようされる、センサチップ。 - 試料内の少なくとも1つの標的分子を検出する部分から成るキットであって、
ラベル検出を可能にするために少なくとも1つのラベルを受けるようされたセンサチップ、及び、
緩衝液内の所定の量の少なくとも1つの標的分子を含み、
前記センサチップが、試薬を含んだ少なくとも第1の溶解可能な層を有する検出表面を含み、
前記少なくとも第1の溶解可能な層が、前記少なくとも1つのラベルの前記少なくとも1つの標的分子との相互作用を可能にするよう、従って、ラベルベースの検出信号の検出を可能にするようされる、キット。 - 負の対照として、少なくとも1つの標的分子を含まない緩衝液をさらに含む、請求項19に記載のキット。
- 請求項1に記載のシステムを調製する方法であって、
(a)検出表面を有したセンサチップを提供するステップ、
(b)試薬を含んだ流体組成物に前記表面を接触させるステップであり、前記流体組成物が界面活性物質を本質的に含んでいない緩衝組成物である、ステップ、
(c)前記検出表面上に層を形成するために、反応物を有した前記緩衝組成物を乾燥させるステップ、
を含む方法。
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EP06122182.6 | 2006-10-12 | ||
EP06122182 | 2006-10-12 | ||
PCT/IB2007/054131 WO2008044214A1 (en) | 2006-10-12 | 2007-10-10 | Fast biosensor with reagent layer |
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JP2010506191A true JP2010506191A (ja) | 2010-02-25 |
JP5221549B2 JP5221549B2 (ja) | 2013-06-26 |
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US (1) | US9128084B2 (ja) |
EP (1) | EP2074421B1 (ja) |
JP (1) | JP5221549B2 (ja) |
CN (1) | CN101523212B (ja) |
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WO (1) | WO2008044214A1 (ja) |
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RU2482495C2 (ru) | 2013-05-20 |
EP2074421A1 (en) | 2009-07-01 |
BRPI0719825A2 (pt) | 2014-05-06 |
US20100009456A1 (en) | 2010-01-14 |
CN101523212B (zh) | 2015-04-01 |
RU2009117602A (ru) | 2010-11-20 |
JP5221549B2 (ja) | 2013-06-26 |
WO2008044214A1 (en) | 2008-04-17 |
CN101523212A (zh) | 2009-09-02 |
US9128084B2 (en) | 2015-09-08 |
EP2074421B1 (en) | 2014-12-17 |
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