JP2007085969A - バイオセンサー - Google Patents
バイオセンサー Download PDFInfo
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- JP2007085969A JP2007085969A JP2005277340A JP2005277340A JP2007085969A JP 2007085969 A JP2007085969 A JP 2007085969A JP 2005277340 A JP2005277340 A JP 2005277340A JP 2005277340 A JP2005277340 A JP 2005277340A JP 2007085969 A JP2007085969 A JP 2007085969A
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- Prior art keywords
- substance
- compound
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- Prior art date
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- 239000000758 substrate Substances 0.000 claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 239000013543 active substance Substances 0.000 claims abstract description 31
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- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-M triflate Chemical compound [O-]S(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-M 0.000 description 1
- CCIDWXHLGNEQSL-UHFFFAOYSA-N undecane-1-thiol Chemical compound CCCCCCCCCCCS CCIDWXHLGNEQSL-UHFFFAOYSA-N 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000012991 xanthate Substances 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
- 229940102001 zinc bromide Drugs 0.000 description 1
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 1
- ZMLPZCGHASSGEA-UHFFFAOYSA-M zinc trifluoromethanesulfonate Chemical compound [Zn+2].[O-]S(=O)(=O)C(F)(F)F ZMLPZCGHASSGEA-UHFFFAOYSA-M 0.000 description 1
- CITILBVTAYEWKR-UHFFFAOYSA-L zinc trifluoromethanesulfonate Substances [Zn+2].[O-]S(=O)(=O)C(F)(F)F.[O-]S(=O)(=O)C(F)(F)F CITILBVTAYEWKR-UHFFFAOYSA-L 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
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Abstract
【解決手段】 化学反応により電子吸引性が増加する置換基を有するフェニルエステル基で修飾された基板からなるバイオセンサー。
【選択図】 なし
Description
好ましくは、基板は、金、銀、銅、白金、及びアルミニウムからなる群より選ばれる自由電子金属からなる金属表面あるいは金属膜である。
好ましくは、本発明のバイオセンサーは、非電気化学的検出に使用され、さらに好ましくは表面プラズモン共鳴分析に使用される。
好ましくは、化学反応はアルキル化反応、錯体化反応、又はジアゾ化反応である。
好ましくは、アミノ基を有する化合物は生理活性物質である。
本発明のバイオセンサーは、化学反応により電子吸引性が増加する置換基を有するフェニルエステル基で修飾された基板からなることを特徴とする。
核酸としては、測定の対象とする核酸と相補的にハイブリダイズするものを使用することができる。核酸は、DNA(cDNAを含む)、RNAのいずれも使用できる。DNAの種類は特に限定されず、天然由来のDNA、遺伝子組換え技術により調製した組換えDNA、又は化学合成DNAの何れでもよい。
低分子有機化合物としては通常の有機化学合成の方法で合成することができる任意の化合物が挙げられる。
免疫グロブリン結合性蛋白質としては、例えばプロテインAあるいはプロテインG、リウマチ因子(RF)等を使用することができる。
糖結合性蛋白質としては、レクチン等が挙げられる。
脂肪酸あるいは脂肪酸エステルとしては、ステアリン酸、アラキジン酸、ベヘン酸、ステアリン酸エチル、アラキジン酸エチル、ベヘン酸エチル等が挙げられる。
被験物質としては例えば、上記した生理活性物質と相互作用する物質を含む試料などを使用することができる。
以下の実施例により本発明を更に具体的に説明するが、本発明の範囲はこれらの実施例に限定されるものではない。
本実施例は、m-N,N-ジメチルアミノフェニルエステルと比較して、そのアルキル化体(4級化体)が生理活性物質の結合能に優れることを示すものである。蛍光色素Cy5がラベル化されたタンパク質(CA:カルボニックアンヒドラーゼ)を用いて、実験を行った。
以下の方法で、本発明のセンサーチップを作成した。
(1)プラスチックプリズム上への金製膜
ゼオネックス(日本ゼオン社製)を射出成型して得られたプラスチックプリズムの上面に以下の方法で金薄膜を製膜した。
(1−1)金製膜
スパッタ装置の基板ホルダにプリズムを取付け、真空(ベースプレッシャー1×10-3Pa以下)に引いてからArガスを導入し(1Pa)、基板ホルダを回転(20rpm)させながら、基板ホルダにRFパワー(0.5kW)を約9分間印加してプリズム表面をプラズマ処理する。次に、Arガスを止めて真空に引き、Arガスを再び導入し(0.5Pa)、基板ホルダを回転(10〜40rpm)させながら、8inchのCrターゲットにDCパワー(0.2kW)を約30秒間印加して2nmのCr薄膜を成膜する。次に。Arガスを止めて再び真空に引き、Arガスを再び導入し、(0.5Pa)、基板ホルダを回転(20rpm)させながら、8inchのAuターゲットにDCパワー(1kW)を約50秒間印加して50nm程度のAu薄膜を成膜する。得られた試料をチップAと呼ぶ。
チップAの金薄膜上に以下の方法でポリマー薄膜を製膜した。
(2−1)ポリマー溶液Aの調製
ポリマー(F-1) 1.5gを脱水MiBK(メチルイソブチルケトン)100mLに溶解し、孔径0.45μmのミクロフィルターで濾過する。脱水MiBKの含水率は20ppmであった。
チップAをスピンコーター(SC-408S試料密閉型スピンコータ−、有限会社押鐘製)にセットする。チップAはスピンコーターの中心から135mmの位置に固定する。ポリマー溶液A 200μLをチップAの金膜全面を覆うようにキャストする。次に、チップAを完全に覆うように風よけカバーをセットする。その後、200rpmで60秒間スピンする。回転が停止した後、5分間そのまま静置する。
ポリマーをスピンコートしたチップAを16時間真空乾燥する。得られた試料をチップBと呼ぶ。
以下の方法で、チップBのポリマー薄膜表面を加水分解して、最表面にCOOH基を発生させた。
(3−1)加水分解
1N NaOH溶液にチップBを浸漬し、60℃の恒温槽で16時間保管する。
(3−2)洗浄
60℃の恒温槽から取り出した後、15分間自然冷却し、その後、超純水で洗浄する。得られた試料をチップCと呼ぶ。
以下の方法で、チップCの表面に存在するCOOH基に5アミノ吉草酸反応を共有結合させた。
(4−1)活性化液、5アミノ吉草酸溶液の調製
0.1M NHS溶液: 1.16gのNHS(N-hydroxysulfosuccinimide)を超純水で溶解し100mLにする。
0.4M EDC溶液: 7.7gのEDC(1-Ethyl-3-[3-Dimethylaminopropyl]carbodiimide Hydrochloride)を超純水で溶解し100mLにする。
1M 5アミノ吉草酸溶液: 11.7gの5アミノ吉草酸を超純水80mLで溶解し、1N NaOHを用いてpH8.5に調整する。さらに超純水を加え100mLにする。
エアガンでチップCの水切りを行う。チップCを湿箱(濡れ布を敷いたタイトボックス、密封した状態で湿度90%RH以上に保つ)にセットし、0.1M NHS溶液100μLと0.4M EDC溶液100μLの混合液200μLをキャストする。その上に120mm×8.5mmに切った厚さ175μmのPETフイルムをのせて液を拡げつつ表面をカバーする。この反応時の液の空気と接しない部分の表面積と空気と接する部分の表面積の比は26である。湿箱を密閉して、25℃で60分静置する。
湿箱から取り出した試料からPETフイルムを取り外し、純水で洗浄する。得られた試料をチップDと呼ぶ。
5アミノ吉草酸反応は活性化反応終了後1時間以内に開始する。先ずエアガンでチップDの水切りを行う。チップDを湿箱にセットし、1M 5アミノ吉草酸溶液200μLをキャストする。その上に120mm×8.5mmに切った厚さ175μmのPETフイルムをのせて液を拡げつつ表面をカバーする。この反応時の液の空気と接しない部分の表面積と空気と接する部分の表面積の比は24である。湿箱を密閉して、25℃で90分静置する。
湿箱から取り出した試料からPETフイルムを取り外し、純水で洗浄する。得られた試料をチップEと呼ぶ。
0.1M NHS溶液: 1.16gのNHSを超純水で溶解し100mLにする。
0.1M m-DMAP溶液: 1.37gのm-DMAP(m-N,N-ジメチルアミノフェノール)を超純水で溶解し100mLにする。
0.4M EDC溶液: 7.7gのEDCを超純水で溶解し100mLにする。
エアガンでチップEの水切りを行い、武蔵エンジニアリング社製ディスペンサーの台座に固定する。次に、シリンジに0.1M NHS溶液2mLと0.4M EDC溶液2mLの混合液を投入する。チップEに18mm間隔で15μLづつ8点、前記混合液をスポッティングする。液滴の直径は約3.5mmとなる。スポッティングを行ったチップEを湿箱にセットし、湿箱を密閉して、25℃で60分静置する。得られた試料をチップFと呼ぶ。
エアガンでチップEの水切りを行い、武蔵エンジニアリング社製ディスペンサーの台座に固定する。次に、シリンジに0.1M m-DMAP溶液2mLと0.4M EDC溶液2mLの混合液を投入する。チップEに18mm間隔で15μLづつ8点、前記混合液をスポッティングする。液滴の直径は約3.5mmとなる。スポッティングを行ったチップEを湿箱にセットし、湿箱を密閉して、25℃で60分静置する。得られた試料をチップGと呼ぶ。
上記操作に従い、m-DMAPエステルを形成する。チップ表面を超純水で洗浄後、チップEに18mm間隔で8μLづつ8点、1.0ccのジメチル硫酸と4.0ccの超純水と5.0ccのエタノールの混合溶液をスポッティングする。液滴の直径は約3.5mmとなる。スポッティングを行ったチップEを湿箱にセットし、湿箱を密閉して、25℃で60分静置する。得られた試料をチップHと呼ぶ。
(6−1)Cy5化CAの合成
Cy5 Mono-reactive Dye Pack(アマシャム社)を購入し、その標準プロトコルに従い、CA(カルボニックアンヒドラーゼ:Sigma社)とCy5 NHSエステルを反応/精製することで、Cy5化CAを得た。1分子のCAに対し、4.7分子のCy5が導入されたことを確認した。
Cy5化CAを50μg/mlになるよう、所定の緩衝液を用いて調液した。pH4.0は酢酸緩衝液、pH7.4はHBS-N緩衝液、pH8.5はホウ酸緩衝液、pH9.4炭酸緩衝液を用いて調液した。
チップF,G,Hのエステル化されている部分に対し、所定のpHのCy5化CAをスポッティングする。液滴の直径は約3.5mmとなる。スポッティングを行ったチップEを湿箱にセットし、湿箱を密閉して、25℃で60分静置する。
フルオロイメージアナライザー(FLA8000、富士写真フイルム社製)を用いて、上記センサーチップ表面の蛍光強度の相対値を比較した(励起波長635nm、測定波長675nm)。センサーチップ表面のエステルがCy5化CAと反応した場合にのみ、センサーチップ表面の蛍光が観察されるため、本手法はエステルの活性化能を評価する有効な手法となる。得られた結果を表2に示す。
Claims (13)
- 化学反応により電子吸引性が増加する置換基を有するフェニルエステル基で修飾された基板からなるバイオセンサー。
- 化学反応により電子吸引性が増加する置換基がジアルキルアミノ基である、請求項1に記載のバイオセンサー。
- 基板が、金、銀、銅、白金、及びアルミニウムからなる群より選ばれる自由電子金属からなる金属表面あるいは金属膜である、請求項1又は2に記載のバイオセンサー。
- 非電気化学的検出に使用される、請求項1から3の何れかに記載のバイオセンサー。
- 表面プラズモン共鳴分析に使用される、請求項1から4の何れかに記載のバイオセンサー。
- 基板上に存在する化学反応により電子吸引性が増加する置換基を有するフェニルエステル基を化学反応により活性化した後に、活性化されたフェニルエステル基をアミノ基を有する化合物と反応させることを含む、アミノ基を有する化合物を基板に固定する方法。
- 化学反応により電子吸引性が増加する置換基がジアルキルアミノ基である、請求項6に記載の方法。
- 化学反応がアルキル化反応、錯体化反応、又はジアゾ化反応である、請求項6又は7に記載の方法。
- アミノ基を有する化合物が生理活性物質である、請求項6から8の何れかに記載の方法。
- アミノ基を有する化合物が請求項6から8の何れかに記載の方法により固定化されている、請求項1から5の何れかに記載のバイオセンサー。
- アミノ基を有する化合物が結合している請求項1から5の何れかに記載のバイオセンサーと被験物質とを接触させる工程を含む、該生理活性物質と相互作用する物質を検出または測定する方法。
- アミノ基を有する化合物と相互作用する物質を非電気化学的方法により検出または測定する、請求項11に記載の方法。
- アミノ基を有する化合物と相互作用する物質を表面プラズモン共鳴分析により検出または測定する、請求項11又は12に記載の方法。
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WO2008143110A1 (ja) * | 2007-05-15 | 2008-11-27 | Andes Electric Co., Ltd. | 抗原検出用センサーチップとその作製方法および抗原検出用センサー |
JP2008309782A (ja) * | 2007-05-15 | 2008-12-25 | Andes Denki Kk | 抗原検出用センサーチップとその作製方法および抗原検出用センサー |
JP2008309783A (ja) * | 2007-05-15 | 2008-12-25 | Andes Denki Kk | 抗原検出用センサーチップとその作製方法および抗原検出用センサー |
JP2013002817A (ja) * | 2011-06-10 | 2013-01-07 | Kyushu Univ | 残留農薬検出方法および表面プラズモン共鳴センサ |
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US20070071642A1 (en) | 2007-03-29 |
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