JP4741477B2 - 増大表面積用ナノファイバー表面 - Google Patents
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- JP4741477B2 JP4741477B2 JP2006514298A JP2006514298A JP4741477B2 JP 4741477 B2 JP4741477 B2 JP 4741477B2 JP 2006514298 A JP2006514298 A JP 2006514298A JP 2006514298 A JP2006514298 A JP 2006514298A JP 4741477 B2 JP4741477 B2 JP 4741477B2
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- B01J20/28004—Sorbent size or size distribution, e.g. particle size
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Description
本願はUSSN 10/792,402(出願日2004年3月2日)と、米国仮出願第60/468,606号(出願日2003年5月5日)及び60/468,390号(出願日2003年5月6日)(いずれも発明の名称“NANOFIBER SURFACES FOR USE IN ENHANCE SURFACE AREA APPLICATIONS”)の一部継続出願であり、その特典と優先権を主張する。これらの原出願はその全開示を全目的で参考資料として本明細書に組込む。
(発明の技術分野)
I)ナノファイバー表面基板の特徴
II)ナノファイバー及びナノファイバー作製
A)ナノファイバー
B)機能化
C)密度及び関連事項
D)ナノファイバー作製
III)ナノファイバー増大表面積基板の典型的態様
A)増大表面積基板のマイクロパターニング
i)パターン化マイクロアレー及びデバイス
ii)ラテラルフローアッセイ用基板としてのナノファイバートラック/チャネル
ii)ナノファイバー増大表面積マイクロアレーのコンポーネントと作製
iii)パターン化増大表面積マイクロアレーにおける構造因子及び表面化学種
iv)増大表面積マイクロアレーにおける基板最適化
v)典型的ナノファイバー増大表面積マイクロアレーの特性決定
vi)典型的増大表面積マイクロアレーと質量分析の併用
B)増大表面積基板におけるシリコンとの近接による非特異的結合蛍光分子の消光
C)分離用途
i)ナノファイバー増大表面積の各種構成の分離態様
D)生体材料とナノファイバー増大表面積基板の相互作用
i)医療装置の細菌汚染の現行防止手段
ii)ナノファイバー増大表面積によるバイオフィルム形成の防止
iii)ナノファイバー表面への細胞外蛋白質の付着
E)キット/システム
F)実施例
平坦シリコン表面と本発明のナノファイバー増大表面積基板の液体(ここでは水)のウィッキングの比較を例証するために、1uL水滴を各々に加えた。図28Aは平坦シリコン表面と本発明のナノファイバー増大表面積基板の水のウィッキング(図28では蒸発率の比較として測定)を比較するグラフを示す。図から明らかなように、ウィッキング(従って、図28に「水分減少率%」により表す蒸発)は本発明の基板のほうが著しく迅速に生じる。図28Bは図28Aのグラフのデータを示す。
図29はフローアッセイスキームに組み立てたナノファイバー増大スライドの模式図である。図29では、ビオチン化BSA(即ちプローブ)2900をスライド2940上のナノファイバートラック(この場合にはナノワイヤートラック)2910に沿う既知位置に吸着させた。トラックは基板上のナノファイバー領域をガラススライドの縁部で擦ることにより作製した。蛍光標識ストレプトアビジン(即ちターゲット)を含む溶液をトラックの上に加えた。SAv−647のPBS/0.1% BSA溶液15ulを加えた後、合計300ulのPBS/0.1% BSAを加えた。液体はこうしてナノファイバー間の間隙を満たすまでナノファイバートラックにウィッキングした。液体流を持続し、未結合ラベルが存在する場合には液浸させるために、付加液体をトラックの上に添加し、濾紙ウィック2920をトラックの下端に配置した。濾紙はトラックを流れた液体のレザバーとして機能した。図29参照。無標識溶液20容量がトラックを流れた後、スライドを乾燥し、次いで蛍光アレースキャナーで走査し、トラック上の特定位置に固定化したBSAと結合した標識ストレプトアビジンを検出した。
規定直径及び長さのナノメートルスケールワイヤーを各種表面上に成長できることを図7に示す。図7は表面積対体積比を増加させるための他のより伝統的なストラテジーの複雑なエッチングアーキテクチャー(例えばシリコンのエッチング)を使用せずに非常に大きい表面積対体積比をもつ「高度」表面の1例を示す。図7はパターニングしたものとしないものの典型的ナノファイバー表面の平面図と側面図のSEM図を示す。シリコンナノファイバーはシリコンウェーハから成長させ、従って表面は標準ガラス修飾化学種等に適合可能であった。上記に詳細に説明したように、本明細書の記載はナノワイヤー成長用基板として主にシリコンウェーハを対象とするが、平坦又は複雑な形状をとり得る広範な基板で方法を潜在的に実施できる。
本発明のサンプルナノファイバーアレーを示すために、真核細胞培養液又は予め購入したRNAサンプル(例えばClontech製品)からの標準mRNA調製物を場合により鋳型として使用し、アレーフォーマットでハイブリダイゼーション用Cy3又はCy5標識cDNAを合成した。該当サンプル中で発現されることが分かっている十分に特性決定された遺伝子の選択パネルに対してオリゴヌクレオチドプローブを作製することができ、ナノファイバー増大基板の相対性能を従来のガラスアレーと比較することができる。分析はスポットマイクロアレーの分析に広く使用されている慣用蛍光アレースキャナー(例えばPerkin Elmer ScanArray等)で実施することができる。図32及び33は現在の市販アレーで使用されている典型的マイクロアレースキャナーによるシステムのナノファイバーアレーの分析/測定と、システムのナノファイバーアレーを使用した2色アッセイを示す。図32から明らかなように、本発明のナノファイバーアレーは慣用アレースキャナーで読み取ることができる。表示データはAxon 4100Aで読み取った。他の同様のアレースキャナー(例えばPerkin Elmers ScanArray)も使用することができる。スキャナーのレーザー出力は典型的平面分析で使用される出力よりも著しく減衰させることができるので、アレーの光退色が生じにくくなる。図32はスライドをアレースキャナーで走査できることと、データが蛍光顕微鏡/CCD分析と同等であるが、検出限界が1桁改善することを示す。図32中、シリーズ1はナノファイバー表面の走査を表し、シリーズ2は平坦表面の走査を表す。図33は本発明のナノファイバーアレーを使用した2色アッセイを示す。ナノファイバーアレーに手で直接スポットし、異なるプローブを異なる突起に吸着させた後に多重(2色)アッセイを行った。Aは可視ナノファイバー領域3300の暗視野画像を示し、Bはナノファイバーアレーの蛍光画像を示す。アレーのナノファイバー突起上にBSA、ビオチンBSA又はマウスIgGをスポットした。alexa 647(赤,3310)標識ストレプトアビジンとalexa 488(緑,3320)標識抗マウスIgGで同時標識後に検出を実施した。
ナノファイバー増大表面積マイクロアレーの概念を例証するために、限定しないが、多数の例証アッセイを実施した。これらの例証アッセイの結果を図34−37に示す。図34は本発明の方法と装置を使用して実施することができるアッセイのサンプルハイブリダイゼーションアッセイシステムの模式図を示す。図34では、基板3410に付着したナノファイバー3400を修飾し、結合の蛍光モニターが可能なターゲット/プローブシステムを構成した。図34では、プローブは5’−ビオチン−TTTTGCCTACGATCA−3’とし、ターゲットは5’−CY5−TTGATCGTAGGCA−3’とした。図34では、例証アッセイに含まれるサンプルステップを示すフロースキームは場合により(平坦又はナノファイバーをもつ)APTES修飾SiO2表面、NHS−PEG−ビオチン、ストレプトアビジン、ビオチン−オリゴプローブ(即ちプローブ結合)、Cy−5−オリゴターゲット(即ちハイブリダイズ)、洗浄及びエピ蛍光顕微鏡による結合蛍光の測定を順次含むことができる。本実施例及び典型的ナノファイバー増大表面積マイクロアレーの特性決定に関する上記関連セクションを例証する他の図面でも同様のシステムを利用した。同図では、「ナノファイバー」はナノファイバー増大表面積基板を表し、「平坦」は表面にナノファイバーをもたないことを意味する。図35はナノファイバー基板と平坦基板のシグナル強度を比較する。なお、蛍光の増加倍率(即ち、蛍光の増加を示す)は図中の各種基板間で正規化している(即ち括弧内に示す強度は20秒露光時間に正規化した飽和結合である)。このような正規化はサンプル間の輝度の差と対応する露光時間の差により必要であった。図面から明らかなように、NFS表面(即ちナノファイバー増大表面積から構成される表面)はプローブとガラススライドの所定の一般的な非特異的結合を示す平坦SiO2に比較して顕著な蛍光強度の増加を示す。自明の通り、単位面積当たりのナノファイバーが多いほど増大表面は大きくなり、結合可能なプローブも増えるので、強度差は場合により各種基板上のナノファイバー密度の差に相関させることができる。図36はナノファイバー基板と平坦表面基板のシグナル強度とダイナミックレンジを比較する。BはAの最下線(即ち平坦表面を示す線)の拡大図である。同図から明らかなように、ナノファイバー表面は未修飾平坦表面よりも広いダイナミックレンジを示す。ダイナミックレンジは(非常に低レベルのプローブで発生する)低レベルの蛍光強度と(プローブの可能な結合/相互作用部位の全部又は実質的に全部が満たされている場合に発生する)最高レベルの蛍光強度の間の範囲の指標とみなすことができる。従って、ダイナミックレンジの増加は高感度が必要である反応又は広範囲の値にわたって発生する反応で有用であると思われる。ナノファイバー表面は表面積の増加によりフットプリント面積当たりのプローブ結合を増すことができるので、平坦非増大表面よりも広い範囲の実験条件等で使用することができる。蛍光消光に関連するダイナミックレンジの更に詳細については下記参照。
質量分析で使用されるナノファイバー増大表面積に関する本発明の各種概念を例証するために、ナノファイバー増大表面(本実施例ではナノワイヤー表面)のDIOS−MS活性を各種条件下で試験し、最適化した。使用した表面はパターン化ナノワイヤー表面(200um平方構造)と、圧縮及び引き伸ばしたナノワイヤー(即ち予め押し潰したナノワイヤー)と、低密度ナノワイヤー表面(即ち単層ナノワイヤー表面)から構成した。これらの典型的態様では、ナノファイバーはかなり高密度の短いファイバーを含む。このようなナノファイバーは表面上にin situ成長又は堆積することができる。所定側面では、ファイバーを予め押し潰して短いファイバーの成長と同様の表面を作る。ナノワイヤー表面はBSTFA(3,3,4,4,5,5,6,6,6−ノナフルオロヘキシル)クロロシランと(3−ペンタフルオロフェニル)プロピルジメチルクロロシラン(夫々別々に試験)で誘導体化した(誘導体化と機能化のその他の詳細については上記参照)。図51は前記化合物の化学構造を示す。ナノワイヤー表面をパターニングし、顕微鏡スライドで予め押し潰し、オゾンで酸化し、上記試薬で化学修飾した。質量分析に使用した検体は小分子3種、標準ペプチド2種(MRFAとブラジキニン)、及び蛋白質消化産物2種(ヘモグロビンとBSA)とした。図52は分析した3種の小分子の化学構造を示す。図53A及び53Bは過フッ素化パターン化ナノワイヤー表面上の夫々5fmolブラジキニンと50fmolヘモグロビンの質量分析結果を示す。図54A〜54Cは過フッ素化パターン化ナノワイヤー表面上の夫々500fmolミダゾラム、500fmolベラパミル、及び2.5pmolプロパフェノンの質量分析結果を示す。最後に、図55は過フッ素化単層ナノワイヤー表面上の5fmolヘモグロビン消化産物の質量分析結果を示す。これらの結果から明らかなように、本発明のナノファイバー増大表面は化合物の質量分析(ここではDIOS−MS)に有用である。共役過フッ素化ナノワイヤー表面は良好なDIOS−MS性能を実現すると思われる。当然のことながら、共役表面の使用は限定的ではない。即ち、他の表面も場合により及び/又は代用として使用できる。更に、単層ナノワイヤー表面では質量分析で高レベルの感度が得られる(例えば5fmolペプチド量と25fmol小分子量について上記図の結果参照)。非常に高感度の所定態様では、短いナノファイバー又はその単層が一般に好ましい。しかし、著しく高感度が必要でない場合には、もっと厚い層を場合により使用することができる。更に、他の態様では、質量分析の前に薄層クロマトグラフィーを実施するためには深いワイヤーセクションが特に有用である。各種質量分析用途で使用する本発明の他の態様では、例えば検出する特定分子等に応じて各種パラメーターを場合により変更する。例えば、使用するレーザーエネルギーを場合により調節することができる(例えば小分子よりもペプチドのレーザーエネルギーレベルを高くする等)。この場合も各種質量分析技術に典型的な変更と最適化は当業者に自明である。図56A−Dはナノファイバー基板上の質量分析の他の例を示し、本発明の方法/装置の無数の可能な使用例の1例を例証する(ここでは規制物質、例えばコカイン、3,4−メチレンジオキシメタムフェタミン、3,4−メチレンジオキシ−N−エチルアムフェタミン、d−メタムフェタミン等の検出及び/又は同定)。図56で検出/特性決定される薬剤の濃度はコカインを500fmolとした以外は全て5pmolとした。
ナノファイバー表面(ここではナノワイヤー)上の自然酸化物と成長酸化物の非特異的結合蛍光の消光の比較を図63に示す。同図は自然酸化物表面によるシリコンの消光効果を示す。酸化した2個のウェーハセグメントはバックグラウンドシグナルの約5倍であったが、特異的結合シグナルの増加は約2.3倍に過ぎなかった。特異的シグナルの増加はナノファイバー密度が高いためであると考えられる。図63の表面の蛍光はPerkin Elmer ScanArray express scannerに633nmレーザーを装備して検出した。バックグラウンド強度(利得45及びレーザー出力70で平均強度として測定)は自然酸化物4080、熱酸化物(部分)21523、及び熱酸化物(完全)18396であった。飽和結合強度(利得33及びレーザー出力70で平均強度として測定)は自然酸化物23245、熱酸化物(部分)54245、及び熱酸化物(完全) 51783であった。蛍光顕微鏡を使用して同様の表面を分析した処、同様の結果であった(図示せず)。図64はシリコン(平坦及びナノファイバー表面)上の自然酸化物と成長酸化物の非特異的結合蛍光の消光を詳細に示す。図64から明らかなように、熱成長酸化物平坦表面のバックグラウンドシグナルは自然酸化物表面のシグナルの4倍を上回る。他方、特異的シグナルは1.75倍に過ぎない。このような差は自然酸化物表面上の非特異的結合の消光の増加を示す。同様に、自然酸化物表面をもつナノファイバー表面(ここではナノワイヤー)は平坦熱酸化物表面の9倍のバックグラウンドであるが、特異的シグナルの増加は35倍である。従って、表面積増加と消光増加が相俟ってダイナミックレンジが増加する。特定メカニズムに結び付けるものではないが、これはフルオロフォアから自然酸化物を経てシリコン基板に至る蛍光のエネルギー伝達に起因すると考えられる。非特異的結合フルオロフォアが平均して特異的結合フルオロフォアよりも表面に接近しているならば、非特異的結合フルオロフォアからの蛍光の選択的消光が生じ、従って、ダイナミックレンジは拡がる。図64ではバックグラウンド強度(利得80及びレーザー出力80で平均強度として測定)は平坦(熱)4640、平坦(自然酸化物)1119及びナノファイバー(ここではナノワイヤー)(自然酸化物)41556であった。飽和結合強度(利得40及びレーザー出力70で平均強度として測定)は平坦(熱)945、平坦(自然酸化物)551及びナノファイバー(自然酸化物)32756であった。利得80及びレーザー出力80で測定した場合には、平坦(熱)12,230、平坦(自然酸化物)6,930であり、ナノファイバー(ナノワイヤー)(自然酸化物)は飽和した。
キャピラリーチューブ内のナノファイバー増大表面積基板の1例を図68〜71に示す。このような増大表面積キャピラリーを作製するために、内径約1mm及び長さ約50mmの石英キャピラリーチューブを作製した。チューブを0.001%ポリ−L−リジンで20分間処理し、N2でブロー乾燥した。次にチューブを150℃に30分間加熱した後、冷却した。チューブのごく先端を40nm金コロイドに浸漬し、毛管作用によりチューブ内に吸引した。コロイドをチューブの内壁に15−20分間付着させ、N2でブロー乾燥した。ナノファイバー(この場合はナノワイヤー)を470℃で30分間30T及び1.5T SiH4下に成長させた。ナノファイバー成長はチューブの全長に進行した。図68及び69はチューブの末端から約1.5mmで切断したチューブ内面の断片の写真を示す。図70及び71はチューブの末端開口から撮影した上から下を見た写真である。
ナノファイバーを成長させる基板上の絶対表面積は増加するが、ファイバーは固体表面積対体積比が低く、連続性がなく、ナノスケールであるため、細胞が付着しにくいと考えられる。本発明のこれらの例証で使用するナノファイバー表面はエレクトロニクス用途に作製しており、本実施例での使用に最適化していないが、自明の通り、このような表面はバイオフィルム蓄積も低減した。使用したシリコンワイヤーは直径〜40nm及び長さ50〜100umのものを4インチシリコン基板上で成長させた。ナノワイヤー作製方法を以下に記載する。本実施例では、本実験で使用したナノワイヤー断片は約0.25cm2とした。培地に導入する直前に100%エタノールに浸漬し、窒素流でブロー乾燥した。シリコンウェーハ対照(即ちナノワイヤーなし)もエタノールに浸漬し、ブロー乾燥した。S.epidermidisを35mmペトリ皿でLBブロスに入れ、6時間37℃で温和に振盪しながら増殖させた。次にウェーハ断片を培養液に入れ、24時間37℃で元の培地に放置した。24時間インキュベーション後にウェーハスライスを取り出し、新鮮な培地で短時間洗浄し、迅速に水に浸漬した後、30秒間熱固定した後に0.2%クリスタルバイオレット溶液で染色した。ウェーハセグメントを水で十分に濯いだ。ウェーハに付着した微生物を従来の明視野顕微鏡により可視化した。画像をディジタルカメラで撮影した。図72の画像はシリコンウェーハ対照に比較してナノワイヤー基板上の細菌の約10分の1の減少を示す。ナノワイヤー層の厚さは顕微鏡の視野深度よりも大きいので、ナノワイヤー内に焦点を合わせることにより顕微鏡で定量を行った。図72では1000倍の倍率で撮影した。黒点が染色したS.epidermidisである。左上の写真は24時間後のナノファイバー(ここではナノワイヤー)表面を示す。左下の写真は72時間後のナノファイバーを示す。右上の写真は24時間後の平坦シリコン表面を示し、右下の写真は72時間後のシリコンを示す。72時間後の平坦シリコンは厚いバイオフィルムで覆われている。ナノファイバー上のぼやけた領域は表面組織が顕微鏡の焦点深度よりも大きいためである。
Claims (13)
- 対象の体内で医療デバイスにバイオフィルムが形成されるのを抑制する医療デバイスの製造方法であって、医療デバイスの1個以上の表面を提供する段階と医療デバイスの1個以上の表面の少なくとも一部に複数の半導体ナノファイバーを成長させる段階を含み、前記ナノファイバーの外面は、ナノファイバーの外面を疎水性にする1種以上の官能基により機能化され、医療デバイスの前記表面が対象と接触し、前記複数のナノファイバーのメンバーが平均長約1ミクロン〜少なくとも約200ミクロンであり、平均直径約5nm〜少なくとも約1ミクロンであり、平均密度約1本/平方ミクロン〜少なくとも約1000本/平方ミクロンである前記医療デバイスの製造方法。
- 1種以上の物質を対象に導入するための薬剤送達デバイスであって、前記デバイスが第1の材料から作られた基板を含み、前記基板が少なくとも第1の表面と、第1の材料とは組成上異なる第2の材料から作られ第1の表面に付着した複数の半導体ナノファイバーと、複数のナノファイバーのメンバー間に構成される1種以上の物質のレザバーと、前記デバイスが対象に導入されたとき対象内の体液に直接さらされないよう少なくとも部分的に保護されるようにレザバーに入れられた前記1種以上の物質を含む前記デバイス。
- レザバーが更に1個以上の貯蔵マトリックスを含む請求項2に記載のデバイス。
- 貯蔵マトリックスが1種以上のポリマーを含む請求項3に記載のデバイス。
- 前記ナノファイバーがシリコンを含んだナノワイヤーからなる請求項2に記載の薬剤送達デバイス。
- 前記ナノワイヤーが、シリコンから作られたコアと前記コアの周りに配置された1個以上のシェル層とを備える請求項5に記載の薬剤送達デバイス。
- 前記1個以上のシェル層が窒化物又は炭化物コーティングを含む請求項6に記載の薬剤送達デバイス。
- 前記複数のナノファイバーを少なくとも第2の表面上で成長させ、第1の表面に移す請求項2に記載の薬剤送達デバイス。
- 前記複数のナノファイバーを第1の表面上で成長させる請求項2に記載の薬剤送達デバイス。
- 前記ナノファイバーが第1の表面の面に対してほぼ平行である請求項2に記載の薬剤送達デバイス。
- 前記ナノファイバーが第1の表面の面に対してほぼ垂直である請求項2に記載の薬剤送達デバイス。
- 第1の表面及び/又はナノファイバーが、シリコン、ガラス、石英、プラスチック、セラミック、金属、ポリマー、TiO、ZnO、ZnS、ZnSe、ZnTe、CdS、CdSe、CdTe、HgS、HgSe、HgTe、MgS、MgSe、MgTe、CaS、CaSe、CaTe、SrS、SrSe、SrTe、BaS、BaSe、BaTe、GaN、GaP、GaAs、GaSb、InN、InP、InAs、InSb、PbS、PbSe、PbTe、AlS、AlP、AlSb、SiO 1 、SiO 2 、炭化ケイ素、窒化ケイ素、ポリアクリロニトリル(PAN)、ポリエーテルケトン、ポリイミド、芳香族ポリマー、及び脂肪族ポリマーからなる群から独立に選択される請求項2に記載の薬剤送達デバイス。
- 前記複数のナノファイバーの間に分散させた複数のナノ粒子を更に含む請求項2に記載の薬剤送達デバイス。
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- 2004-05-05 WO PCT/US2004/014006 patent/WO2004099068A2/en active Application Filing
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CA2522872C (en) | 2014-04-29 |
EP1620256A4 (en) | 2013-09-25 |
JP2007526439A (ja) | 2007-09-13 |
TWI427709B (zh) | 2014-02-21 |
EP1620256A2 (en) | 2006-02-01 |
WO2004099068A2 (en) | 2004-11-18 |
AU2004236260B2 (en) | 2010-04-01 |
WO2004099068A3 (en) | 2005-04-21 |
US20100285972A1 (en) | 2010-11-11 |
AU2004236260A1 (en) | 2004-11-18 |
CA2522872A1 (en) | 2004-11-18 |
TW200501277A (en) | 2005-01-01 |
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