JP2005533265A - 物質を検出する装置および物質を検出する方法 - Google Patents
物質を検出する装置および物質を検出する方法 Download PDFInfo
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54366—Apparatus specially adapted for solid-phase testing
- G01N33/54373—Apparatus specially adapted for solid-phase testing involving physiochemical end-point determination, e.g. wave-guides, FETS, gratings
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/022—Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
Description
S=Δf/Δm=c(f0/m)∝f0 2 (1)
が成り立つ(G.Sauerbrey, Zeitschrift fuer Physik, 155(1959), p.206-222を参照)。ここでSは共振器の質量感応性であり、f0は吸収された物質がない場合の共振器の共振周波数であり、mは面積単位あたりの共振器の質量である。質量感応性は共振器の共振周波数の2乗に比例する。比較的低い共振周波数f0、すなわち約20MHzまでの周波数では、周知の装置の質量感応性は約1Hz・ng−1・cm2と見積もられる。
・物質の検出装置として従来の装置に比べて高い質量感応性を有する。本発明の装置の質量感応性は数Hz・pg−1cm2である。
・物質認識分子に対する3次元の固定化マトリクスを使用することにより、質量感応性がさらに高まる。
・高い質量感応性を有するので、検出すべき物質(分析分子)をマーキングしなくてよい。本発明では検出を“レーベルフリー”で行うことができる。
・本発明の装置の共振器は横方向の広がりが小さい。横方向の広がりが小さいので、複数の共振器をスペースを節約したうえで共振器マトリクスとして基板上に配置することができる。これにより高い集積密度が達成される。
・共振器マトリクスにより複数の物質を並列に検出することができる。
・共振器の横方向の広がりが小さいため、小さい体積のプローブ流体を調査することができる。
・共振器を備えた装置を簡単かつ低コストに製造することができる。製造に際しては周知の薄膜技術が利用される。半導体基板を使用することにより、CMOS技術やバルクマイクロマシニングも適用可能である。
・1つまたは複数の共振器の電気コンタクトに対して特にLTCC基板の形態の高周波数基板が適している。
・フリップチップ技術により、高周波数損失や、共振器の電気コンタクトのためのボンディングワイヤに発生する障害インダクタンスが大幅に低減される。これにより高い動作品質および高い質量感応性が得られる。この利点は特に共振器のマトリクス素子を高密度に集積して共振器マトリクスを形成したときに顕著となる。
ピエゾアコースティック共振器2の金から成る電極5上に、化学的感応性を有するコーティング10、すなわち25個の塩基から成るオリゴヌクレオチドが固定化される。オリゴヌクレオチドは数mmolの濃度の水性溶液としてサブナノリットルの範囲で電極5に塗布される。各オリゴヌクレオチドは3’−側にチオールアルキル基を有し、5’−側にビオチン基を有する。チオールアルキル基を介して硫黄‐金結合の構造が生じる。オリゴヌクレオチドは電極5に固定化されており、オリゴヌクレオチドの基本骨格はいわば固定化層を形成している。ビオチン基はストレプトアビジンとともに強い複合体を形成する。ビオチン基はいわばストレプトアビジンに対する物質認識分子として機能する。このタンパク質が流体中に存在し、これに化学的感応性を有するコーティング10が曝露されると複合体が形成され、タンパク質が化学的感応性を有するコーティング10に吸収される。
25個の塩基から成るオリゴヌクレオチドがチオールアルキル基によって固定化される。オリゴヌクレオチドは小さいビオチン基を有する。相応に相補的なヌクレオチド配列を有するDNAフラグメントは水素架橋結合の構造により固定化されたオリゴヌクレオチドへ結合される。
Claims (23)
- 少なくとも1つのピエゾアコースティック共振器(2)を含み、該共振器は少なくとも1つの圧電層(4)と、該圧電層上に配置された第1の電極(5;6)および少なくとも1つの第2の電極(6;5)と、流体(9)中の物質の吸収に用いられる表面セクション(8)とを有し、
ここで圧電層、電極および表面セクションは、電極を電気的に駆動したときに表面セクションで吸収される物質の量に依存した共振周波数で共振器が発振するように配置されている
流体中の少なくとも1つの物質を検出する装置(1)において、
圧電層(4)の厚さ(7)が0.1μm以上20μm以下の範囲から選択されており、
共振周波数が500MHz以上10GHz以下の範囲から選択されている
ことを特徴とする流体中の少なくとも1つの物質を検出する装置。 - 前記共振器(2)は20μm以上1000μm以下の範囲から選択された横方向の広がり(11)を有する、請求項1記載の装置。
- 前記共振器(2)の振動は縦振動(52)および/または幅方向のせん断振動(51)のグループから選択されている、請求項1または2記載の装置。
- 前記圧電層(4)はジルコン酸チタン酸鉛、亜鉛酸化物および/またはアルミニウム窒化物のグループから選択された圧電材料を有する、請求項1または2記載の装置。
- 前記共振器(2)は半導体基板(3)上に配置されている、請求項1から4までのいずれか1項記載の装置。
- 前記共振器(2)と前記半導体基板(3)とを音響的に分離する少なくとも1つの分離手段(15)が設けられている、請求項5記載の装置。
- 流体中の物質を吸収する前記表面セクション(8)は前記半導体基板(3)の切欠(13)に配置されている、請求項5または6記載の装置。
- 少なくとも1つの評価回路(17,18)が前記共振器(2)の共振周波数を求めるために設けられている、請求項1から7までのいずれか1項記載の装置。
- 前記評価回路は半導体基板(3)内に配置された内部評価回路(17)である、請求項8記載の装置。
- 前記評価回路は半導体基板の外部に配置された外部評価回路である、請求項8記載の装置。
- 前記共振器(2)と前記外部評価回路(18)とを接続する少なくとも1つの電気コンタクト手段(20)が設けられており、該電気コンタクト手段はFR4基板および/またはLTCC基板のグループから選択された高周波数基板である、請求項10記載の装置。
- 前記半導体基板(3)を備えた共振器(2)と前記高周波数基板(20)とがフリップチップ技術により相互に接続されている、請求項11記載の装置。
- 流体中の物質を吸収する前記表面セクション(8)は前記共振器(2)の化学的感応性を有するコーティング(10)によって形成されている、請求項1から11までのいずれか1項記載の装置。
- 前記共振器(2)は保護層(12)を有しており、該保護層(12)上に前記化学的感応性を有するコーティング(10)が被着されている、請求項13記載の装置。
- 複数の共振器(2)が共振器マトリクス(26)としてまとめられており、各共振器(2)は共振器マトリクス(26)のマトリクス素子(27)となっている、請求項1から14までのいずれか1項記載の装置。
- 前記共振器マトリクス(26)の各共振器(2)はそれぞれ所定の物質の検出に用いられる、請求項15記載の装置。
- 隣接するマトリクス素子間の間隔(28)は50μm以上1000μm以下の範囲から選択されている、請求項15または16記載の装置。
- 請求項1から17までのいずれか1項記載の流体中の少なくとも1つの物質を検出する装置を用いて流体中の少なくとも1つの物質を検出する方法において、
a)流体中の物質が共振器の表面セクションで吸収されるように流体をピエゾアコースティック共振器へ加えるステップと、
b)共振器の共振周波数を求め、該共振周波数から表面セクションで吸収された物質量を結論するステップとを有する
ことを特徴とする流体中の少なくとも1つの物質を検出する方法。 - 流体が存在するときの共振周波数を求める、請求項18記載の方法。
- 流体が存在しないときの共振周波数を求める、請求項18または19記載の方法。
- 流体として液体を使用し、該液体を共振器に加え、共振器の表面セクションに物質が吸収されて残るようにし、その後共振周波数を求める前に液体を除去する、請求項20記載の方法。
- 前記化学的感応性を有するコーティングは物質認識分子を有する、請求項13記載の装置。
- 前記化学的感応性を有するコーティングは共振器と物質認識分子とを結合するための固定化層である、請求項22記載の装置。
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- 2003-07-03 JP JP2004528345A patent/JP4215717B2/ja not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
---|---|
US7468608B2 (en) | 2008-12-23 |
WO2004017063A2 (de) | 2004-02-26 |
EP1549937B1 (de) | 2013-03-20 |
AU2003250294A1 (en) | 2004-03-03 |
EP1549937A2 (de) | 2005-07-06 |
WO2004017063A3 (de) | 2004-05-13 |
JP4215717B2 (ja) | 2009-01-28 |
US20060125489A1 (en) | 2006-06-15 |
AU2003250294A8 (en) | 2004-03-03 |
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