JP4927319B2 - 高密度カーボンナノチューブフィルムまたはパターンを用いたバイオチップの製造方法 - Google Patents
高密度カーボンナノチューブフィルムまたはパターンを用いたバイオチップの製造方法 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
- G01N33/54353—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals with ligand attached to the carrier via a chemical coupling agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Description
本発明で用いられるCNTは特に限定するのではなく、市販の製品を購入して用いることはもとより、通常の方法によって製造して用いることもできる。純粋なCNTを本発明に用いるためにはCNTの表面及び/または両末端をカルボキシル化する必要がある。
本発明では、シリコーン、ガラス、溶融シリカ、プラスチック、 PDMS(ポリジメチルシロキサン)などの基質表面上にアミンアルキルオキシランで変形してアミン基を基質表面に露出させて使用したが、市販の、アミンで表面処理された基質を購入して使用することも可能である。
実施例1で準備したカルボキシル基が露出されたCNTを、実施例2で準備したアミン基が露出された基質と反応させ、前記カルボキシル基と前記アミン基間のアミド結合によって基質上にCNT単層を形成した(図1(a))。
基質上にパターン状のアミン基を露出させるために2つの方法を使用することができる。第1方法は、シリコーン、ガラス、溶融シリカ、プラスチック、PDMS(ポリジメチルシロキサン)などの基質上に高分子、フォトレジストまたは有機超分子パターンを形成した後、前記パターンをマスクとしてアミノアルキルオキシランを表面に固定してアミン基を基質表面にパターン状に露出させる方法であり、第2方法は、基質表面をアミノアルキルオキシランで処理した後、高分子、フォトレジストまたは有機超分子パターンを形成してアミン基を基質表面にパターン状に露出させる方法である。前記アミノアルキルオキシランとしてはアミノプロピルトリエトキシシランを使用することが好ましい。
実施例3で作製されたカルボキシル基が露出されたCNTフィルムにDNAのアミン基を結合させてCNT−DNAチップを作製した(図2)。本実施例では、前記カルボキシル基とアミン基とのアミド結合のためにカップリング剤としてEDCを使用し、ベースとしてNHSを使用した。また、本実施例では、末端にアミン基を有する下記配列1のオリゴヌクレオチドを使用してCNT−DNAチップを作製した。
本実施例では、実施例4で作製されたカルボキシル基が露出されたCNTパターンにDNAのアミン基を結合させてDNAチップを作製した(図2)。他の方法として、実施例4で作製されたカルボキシル基が露出されたCNTパターンを、両側にアミノ作用基を有するジアミン系有機化合物で改質してアミノ作用基を露出させた後、前記アミン基にDNAのカルボキシル基を結合させてDNAチップを作製することもできる(図3)。
実施例6で作製されたDNAチップを混成化チェンバー(hybridization chamber)の中に置いた後、CNTが固定された部位に混成化溶液を落とし、その上部をカバースライドで覆った。この時、混成化溶液は、32μlの相補的な塩基配列のオリゴヌクレオチドを有する溶液に入れ、最終濃度3XSSC(0.45M NaCl、0.045M クエン酸ナトリウム)及び0.3%のSDS(ドデジル硫酸ナトリウム)になるように作って、総容積を40μlとした。前記相補的なオリゴヌクレオチド塩基配列は、末端にFITC(フルオレセイン イソチオシアネート)が付着された下記配列2を使用した。
Claims (5)
- 表面にアミン基、アルデヒド基、水酸基、チオール基及びハロゲンからなる群から選ばれた化学的な作用基が露出された高密度CNTフィルムまたはパターンに前記化学的な作用基と結合する作用基を有するバイオリセプターを化学的または物理化学的に結合させることを特徴とするCNT−バイオチップの製造方法であって、
(a)〈1〉基質をアミノアルキルオキシシランで処理して得られる表面にアミン基が露出された基質;〈2〉基質をアミノアルキルオキシシランで処理して得られる表面にアミン基が露出された基質にフォトレジストパターンまたは有機超分子パターンを形成して得られる、アミン基がパターン状に露出された基質;または〈3〉基質上にフォトレジストパターンまたは有機超分子パターンを形成した上で、アミノアルキルオキシシランで処理して得られる、アミン基がパターン状に露出された基質と、
カルボキシル基が露出されたCNTを反応させ、前記アミン基と前記カルボキシル基間のアミド化反応によって基質表面にCNT単層または単層パターンを形成する段階、
(b)前記CNT単層または単層パターンと両末端にアミン基を有する有機化合物を反応させて前記CNT単層上に有機アミン基を形成し、前記有機アミンとカルボキシル基が露出されたCNTとを反応させてCNTを積層する段階、
(c)前記(b)段階をn回繰り返してCNT層と有機アミン基とをn回交互に積層して、カルボキシル基が露出された、反複的に積層して高い表面密度を有する高密度のCNTフィルムまたはパターンを形成する段階および、
(d)前記カルボキシル基が露出された高密度CNTフィルムまたはパターンをH2N-R1-NH2、H2N-R2-CHO、H2N-R3-OH、H2N-R4-SH及びH2N-R5-X(ここで、R1、R2、R3、R4及びR5は独立的にC1-20である飽和炭化水素類、不飽和炭化水素類または芳香族有機基であって、Xはハロゲン元素である)からなる群より選ばれる化学物質で改質する段階、及び
(e)前記アミン基、アルデヒド基、水酸基、チオール基、及びハロゲンからなる群から選ばれた化学的な作用基が露出された高密度CNTフィルムまたはパターンに前記化学的な作用基と結合する作用基を有するバイオリセプターを化学的または物理化学的に結合させる段階を含み;
基質はシリコン、ガラス、溶融シリカ、プラスチックおよびポリジメチルシロキサンからなる群から選択された材質であることを特徴とする製造方法。 - 請求項1に記載の方法によって製造され、アミン基、アルデヒド基、水酸基、チオール基及びハロゲンからなる群から選ばれた化学的な作用基が露出された高密度CNTフィルムまたはパターンに前記化学的な作用基と結合する作用基を有するバイオリセプターを化学的または物理化学的な結合によって付着させることを特徴とするCNT−バイオチップ。
- バイオリセプターは酵素基質、リガンド、アミノ酸、ペプチド、蛋白質、DNA、RAN、PNA、脂質、または炭水化物であることを特徴とする請求項2に記載の製造CNT−バイオチップ。
- バイオリセプターはDNAであることを特徴とする請求項3に記載の製造CNT−バイオチップ。
- 請求項4に記載のCNT−バイオチップを用いることを特徴とするDNA混成化反応の検出方法。
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