JP2009053129A - バイオセンサー用チップおよびその製造方法並びに表面プラズモン共鳴分析用センサー - Google Patents
バイオセンサー用チップおよびその製造方法並びに表面プラズモン共鳴分析用センサー Download PDFInfo
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- JP2009053129A JP2009053129A JP2007222065A JP2007222065A JP2009053129A JP 2009053129 A JP2009053129 A JP 2009053129A JP 2007222065 A JP2007222065 A JP 2007222065A JP 2007222065 A JP2007222065 A JP 2007222065A JP 2009053129 A JP2009053129 A JP 2009053129A
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- polymer
- biosensor chip
- carboxyl group
- polyamino
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Abstract
【解決手段】バイオセンサー用チップを、基板と、この基板表面上に配置されたカルボキシル基を有するポリマーと、このポリマー表面に、カルボキシル基と直接または間接に結合したポリアミノ基と、カルボキシル基と直接または間接に結合した長鎖アルキル基とを備えてなるものとする。
【選択図】図1
Description
Analytical Biochemistry 277,196-205(2000) Analytical Biochemistry 280,29-35(2000)
前記長鎖アルキル基は、前記ポリマー表面に結合したポリアミノ基と結合していてもよい。この場合、前記ポリマー表面に、さらに別に直接または間接に結合したポリアミノ基を備えていてもよい。
前記長鎖アルキル基は炭素数10〜22のアルキル鎖であることが好ましい。
前記カルボキシル基を有するポリマーは金属膜を介して前記基板上に配置されていることが好ましい。
前記金属膜は、金、銀、銅、白金、またはアルミニウムから選択される少なくとも1つの金属からなることが好ましい。
本発明のバイオセンサー用チップは、基板表面上に配置されたカルボキシル基を有するポリマーのカルボキシル基を、後述する自己組織化膜で被覆された基板に結合する際のポリマーの活性化と同様にして活性化し、この活性化したカルボキシル基にポリアミノ基を有する化合物を結合させ、その後、長鎖アルキル基を有する化合物を結合させることにより製造することができる。ポリアミノ基を有する化合物を先に結合させた後に、長鎖アルキル基を有する化合物を結合させることにより、長鎖アルキル基を容易に導入することが可能になるとともに、反応効率を向上させることによりポリマー表面の正電荷をより減少させることができる。
本発明のバイオセンサー用チップにおける基板は、表面プラズモン共鳴バイオセンサー用を考えた場合、一般的にはBK7等の光学ガラス、あるいは合成樹脂、具体的にはポリメチルメタクリレート、ポリエチレンテレフタレート、ポリカーボネート、シクロオレフィンポリマーなどのレーザー光に対して透明な材料からなるものが使用できる。このような基板は、好ましくは、偏光に対して異方性を示さずかつ加工性の優れた材料が望ましい。
金属膜が形成された基板上には、ポリマー(高分子膜)が結合される。高分子膜は、親水性ポリマー、疎水性ポリマー、又はその組み合わせから構成することができ、生理活性物質を3次元的に結合可能であるという観点からは、親水性ポリマーが結合していることがより好ましい。この高分子膜は基板上に直接結合されても、間接的に結合されていてもよいが、自己組織化膜上に形成されることがより好ましい。
自己組織化膜とは、外からの細かい制御を加えていない状態で、膜材料そのものがもつ機構によって形成される一定の秩序をもつ組織をもった単分子膜やLB膜などの超薄膜のことを言う。この自己組織化により、非平衡な状況で長距離にわたって秩序がある構造やパターンが形成される。
親水性ポリマーとしては、デキストラン誘導体、デンプン誘導体、セルロース誘導体、ゼラチン等の天然高分子、ポリビニルアルコール、ポリエチレングリコール、ポリビニルピロリドン、ポリアクリルアミド誘導体、ポリメチルビニルエーテル等の合成高分子等が挙げられる。
親水性ポリマーとしてカルボキシル基を含有するポリマーを使用する場合、カルボキシル基を活性化することによって、自己組織化膜で被覆された基板に結合することができる。カルボキシル基を含有するポリマーを活性化する方法としては、公知の手法、例えば、水溶性カルボジイミドである1-(3-Dimethylaminopropyl)-3 ethylcarbodiimide(EDC)とN-Hydroxysuccinimide(NHS)により活性化する方法、特開2006-58071号に記載の方法(即ち、特定の構造を有するウロニウム塩、ホスホニウム塩、又はトリアジン誘導体のいずれかの化合物を用いてカルボキシル基を活性化する方法)、特開2006-90781号に記載の方法(即ち、カルボジイミド誘導体又はその塩で活性化し、水酸基を有する含窒素ヘテロ芳香族化合物、電子吸引性基を有するフェノール誘導体又はチオール基を有する芳香族化合物のいずれかの化合物を用いてカルボキシル基を活性化する方法)等を好ましく用いることができる。
生理活性物質は、例えば免疫蛋白質、酵素、微生物、核酸、低分子有機化合物、非免疫蛋白質、免疫グロブリン結合性蛋白質、糖結合性蛋白質、糖を認識する糖鎖、脂質、脂肪酸もしくは脂肪酸エステル、あるいは配位子結合能を有するポリペプチドもしくはオリゴペプチドなどが挙げられる。生理活性物質の固定化は、生理活性物質を含む溶液を塗布することによって、あるいは生理活性物質を含む溶液に浸漬する方法によって行うことができる。
本発明にいうバイオセンサーとは最も広義に解釈され、生体分子間の相互作用を電気的信号等の信号に変換して、対象となる物質を測定・検出するセンサーを意味する。通常のバイオセンサーは、検出対象とする化学物質を認識するレセプター部位と、そこに発生する物理的変化又は化学的変化を電気信号に変換するトランスデューサー部位とから構成される。生体内には、互いに親和性のある物質として、酵素/基質、酵素/補酵素、抗原/抗体、ホルモン/レセプターなどがある。バイオセンサーでは、これら互いに親和性のある物質の一方を基板に固定化して分子認識物質として用いることによって、対応させるもう一方の物質を選択的に計測するという原理を利用するものである。
以下に本発明のバイオセンサー用チップについての実施例を示す。
2.8mM のHODhbt(3,4-ジヒドロ-3-ヒドロキシ-4-オキソ-1,2,3-ベンゾトリアジン)水溶液と0.4M のEDC(1-エチル-3-(3-ジメチルアミノプロピル)カルボジイミド塩酸塩((株)同仁化学製))水溶液の1:1混合溶液100μlを、Biacore社センサーチップCM-5(research grade)表面に接触させ、室温で10分間反応させた。水洗後、真空乾燥機を用いて室温で10分間乾燥させた。この表面に対し、1,2-ビス(2-アミノエトキシ)エタン100μlを接触させ、室温で10分間反応させた後、水洗した。次ぎに、1.0gのステアリン酸(Aldrich製)と0.1gのTween20(東京化成(株)製)を1.0mlのDMFに溶解した溶液に0.1M N-ヒドロキシコハク酸イミド((株)同仁化学製)の水溶液を0.5ml、0.4M 1-エチル-3-(3-ジメチルアミノプロピル)カルボジイミド塩酸塩((株)同仁化学製)水溶液0.5mlを添加し混合して、室温で10分間反応させた後、DMFで洗浄後、続いて水洗してチップを作製した。
実施例1において、ステアリン酸のかわりにオレイン酸を用いた以外は実施例1と同様にしてチップを作製した。
0.1mMのNHS(N-hydroxysuccinamide)水溶液と0.4MのEDC水溶液の1:1(v/v)混合液100μlを、Biacore社センサーチップCM5(Research Grade)表面に接触させ水洗後、0.1mgのオレイルアミンを1mlのDMFに溶解した液と室温で10分間反応させ、水洗乾燥した。この表面に対して2.8mMのHODhbt(3,4-ジヒドロ-3-ヒドロキシ-4-オキソ-1,2,3-ベンゾトリアジン)水溶液と0.4MのWSC水溶液の1:1(v/v)混合液100μl を反応させ水洗後、真空乾燥機を用いて室温で10分間乾燥させた。次ぎに、1,2-ビス(2-アミノエトキシ)エタン100μlを接触させ、室温で10分間反応させた後、水洗した。さらに0.1mgのアセチルクロリドの1mlDMF溶液をこの表面に反応させ、室温で1時間静置した後、DMF洗浄後、水洗してチップを作製した。
2.8mM のHODhbt水溶液と0.4M のEDC水溶液の1:1混合溶液100μlを、Biacore社センサーチップCM-5表面に接触させ、室温で10分間反応させた。水洗後、真空乾燥機を用いて室温で10分間乾燥させた。この表面に対し、1,2-ビス(2-アミノエトキシ)エタン100μlを接触させ、室温で10分間反応させた後、水洗した。次ぎに、1.0gのステアリン酸を1.0mlのDMFに溶解した溶液に0.1M N-ヒドロキシコハク酸イミドの水溶液を0.5ml、0.4M 1-エチル-3-(3-ジメチルアミノプロピル)カルボジイミド塩酸塩水溶液0.5mlを添加し混合して、室温で10分間反応させた後、DMFで洗浄後、続いて水洗した。さらに0.1mgのアセチルクロリドの1mlDMF溶液をこの表面に反応させ、室温で1時間静置した後、DMF洗浄後、水洗してチップを作製した。
実施例1のチップと、比較例としてBiacore社センサーチップL1(基板表面に設けられたデキストランを長鎖アルカンで修飾したもの)をBiacore社製の表面プラズモン共鳴装置であるBiacore3000にセットし、カチオン、アニオン、ノニオンの3種リポソーム(コートソーム:日本油脂(株)製)の吸着量を測定した。得られたセンサーグラムを図5および図6に示す。
実施例1〜4のチップと、比較例としてBiacore社センサーチップL1をBiacore社製の表面プラズモン共鳴装置であるBiacore3000にセットし、メチレンブルーの吸着により汚染防止性能を測定した。0〜200RU以下の吸着を○、200RUより大きい吸着を×として評価した。結果を表1に示す。
Claims (11)
- 基板と、該基板表面上に配置されたカルボキシル基を有するポリマーと、該ポリマー表面に前記カルボキシル基と直接または間接に結合したポリアミノ基と、前記カルボキシル基と直接または間接に結合した長鎖アルキル基とを備えてなることを特徴とするバイオセンサー用チップ。
- 前記ポリアミノ基が末端にアシル基を有することを特徴とする請求項1記載のバイオセンサー用チップ。
- 前記長鎖アルキル基が、前記ポリマー表面に結合したポリアミノ基と結合していることを特徴とする請求項1記載のバイオセンサー用チップ。
- 前記ポリマー表面に、さらに直接または間接に結合したポリアミノ基を備えてなることを特徴とする請求項3記載のバイオセンサー用チップ。
- 前記ポリアミノ基がジアミノアルキレン基またはジ(アミノアルキル)エーテル基であることを特徴とする請求項1〜4いずれか1項記載のバイオセンサー用チップ。
- 前記長鎖アルキル基が炭素数10〜22のアルキル鎖であることを特徴とする請求項1〜5いずれか1項記載のバイオセンサー用チップ。
- 前記カルボキシル基を有するポリマーがカルボキシメチルデキストランであることを特徴とする請求項1〜6いずれか1項記載のバイオセンサー用チップ。
- 前記カルボキシル基を有するポリマーが金属膜を介して前記基板上に配置されていることを特徴とする請求項1〜7いずれか1項記載のバイオセンサー用チップ。
- 前記金属膜が、金、銀、銅、白金、またはアルミニウムから選択される少なくとも1つの金属からなることを特徴とする請求項8記載のバイオセンサー用チップ。
- 基板表面上に配置されたカルボキシル基を有するポリマーの前記カルボキシル基を活性化し、該活性化したカルボキシル基にポリアミノ基を有する化合物を結合させ、その後、長鎖アルキル基を有する化合物を結合させることを特徴とするバイオセンサー用チップの製造方法。
- 請求項1〜9記載のバイオセンサー用チップを備えていることを特徴とする表面プラズモン共鳴分析用センサー。
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EP3036102A4 (en) * | 2013-08-19 | 2017-01-25 | Queen's University At Kingston | Carbene functionalized composite materials |
CN104805509A (zh) * | 2015-04-08 | 2015-07-29 | 南京普东兴生物科技有限公司 | 一种羧基修饰的基因芯片基片及其制备方法 |
US10088447B2 (en) * | 2016-09-30 | 2018-10-02 | Seung Ik Jun | Biosensor |
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AU5815886A (en) | 1985-05-29 | 1986-12-24 | Kurt Tiefenthaler | Optical sensor for selectively determining the presence of substances and the variation of the refraction index in the measured substances |
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