JP2007533847A - 貴金属の磁気ナノ粒子 - Google Patents
貴金属の磁気ナノ粒子 Download PDFInfo
- Publication number
- JP2007533847A JP2007533847A JP2007504428A JP2007504428A JP2007533847A JP 2007533847 A JP2007533847 A JP 2007533847A JP 2007504428 A JP2007504428 A JP 2007504428A JP 2007504428 A JP2007504428 A JP 2007504428A JP 2007533847 A JP2007533847 A JP 2007533847A
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- JP
- Japan
- Prior art keywords
- magnetic
- magnetic nanoparticles
- nanoparticles
- nanoparticles according
- noble metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- QBVXKDJEZKEASM-UHFFFAOYSA-M tetraoctylammonium bromide Chemical compound [Br-].CCCCCCCC[N+](CCCCCCCC)(CCCCCCCC)CCCCCCCC QBVXKDJEZKEASM-UHFFFAOYSA-M 0.000 description 2
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- JAJIPIAHCFBEPI-UHFFFAOYSA-N 9,10-dioxoanthracene-1-sulfonic acid Chemical compound O=C1C2=CC=CC=C2C(=O)C2=C1C=CC=C2S(=O)(=O)O JAJIPIAHCFBEPI-UHFFFAOYSA-N 0.000 description 1
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- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 1
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- NRUVOKMCGYWODZ-UHFFFAOYSA-N sulfanylidenepalladium Chemical compound [Pd]=S NRUVOKMCGYWODZ-UHFFFAOYSA-N 0.000 description 1
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Images
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Abstract
Description
a)磁気記録中の情報密度の増大、
b)生体臨床医学における診断技術の開発、
c)薬剤の制御放出、
d)過温症の処置、
e)核磁気共鳴における画像の改良、
f)バイオセンサー及びバイオチップ、
g)磁気印刷、
h)磁気光学的用途、及び
i)符号化。
図1は、a)ドデカンチオールで機能化された金のナノ粒子、及びb)ドデカンチオールで機能化されたパラジウムのナノ粒子の透過型電子顕微鏡によって得られた顕微鏡写真である。
i)R−SH(式中、Rは一般に脂肪族鎖を示す)型の種々の有機化合物のチオール誘導体の存在下での金又はパラジウムの還元。還元剤はホウ化水素である。所望の微細構造を得るためには、この反応は過剰のチオール誘導体の存在下でおこなう。
ii)水溶性チオール誘導体の存在下における水性媒体中での金塩又はパラジウム塩の還元。この方法は、上記の方法i)と類似する。
本発明によるナノ粒子は、薬剤放出用トレーサーとして使用される放射性物質の代わりに使用することができる。放射性物質の代わりにこの種のナノ粒子を使用する場合には、磁気的特性の変化を測定することにより薬剤の放出を監視することができ、これによって放射線の有害な効果を回避することが可能となる。
磁性ナノ粒子が付着又は蓄積した領域(例えば、腫瘍部位)を局部的に加熱するために外部AC磁場が印加される。供与される製剤も、金属製芯と同様に、特定のリガンドを含んでおり、該リガンドは医薬であってもよく、あるいは、該リガンドは特定の組織中でのナノ粒子の蓄積を支援することができる。
処置や腫瘍等の種類に応じた測定がおこなわれるような機能化の実施の可能性に起因する。
貴金属のナノ粒子は、MRにおける画像改良のために使用することができる。MR画像は、腫瘍等の組織構造の効率的な観察を可能にするために十分なコントラストを欠く場合がある。この種の画像は、例えば、小さなサイズの腫瘍の検知とより良い処置の可能性をもたらす磁性ナノ粒子をコントラスト媒体として使用することによって改良することができる。AuやPdのような貴金属を芯に含有する本発明による磁性ナノ粒子はこのような用途に対して特に有用である。この理由は、元素状態の金属は、同じ金属の酸化物よりも良好な造影剤だからである。さらに、この種のナノ粒子は、その他のナノ粒子(例えば、芯にAuとFeを含むナノ粒子)よりも良好な生体適合性を示す。
図7は、A型リガンド(1)で機能化された磁性ナノ粒子に基づくバイオセンサー器具の模式図である。A型リガンドが生体分子(2)を認識すると、ナノ粒子が付着して信号が磁気センサー(3)内で検知される。この場合、該磁気センサーは保護不動態層(4)によって分離される。模式図に示すような器具のアレイ(array)は、バイオチップ型ユニットが形成されるように配設され、該ユニット内においては、各々の磁気抵抗性センサーは、生体分子アレイの1種の成分に対応する信号を読み取る。
支持体上に所定状態で分布された貴金属のナノ粒子は、データ記憶用磁場を使用することによるコンパクトディスクの製造用基材として利用することができる。情報の読み取りは、磁気センサー(磁気抵抗性型)又はレーザーを用いるカー効果によっておこなうことができる。
貴金属の磁性ナノ粒子は、粉状形態に加工して貯蔵される。コロイド溶液(強磁性流体)調製においては、前駆体の粉末が使用される。ナノ粒子の機能化の態様を変化させることによって、強磁性流体は異なる種類の溶剤(有機溶剤又は水性溶剤)中で調製される。磁性インクは、バーコード等の磁性印刷や筆記等において加工される。
98%のテトラオクチルアンモニウムブロミド[N(C8H17)4Br](アルドリッチ社製)0.11gをトルエン(予め乾燥処理と脱ガス処理に付したトルエン)20ml中に溶解させた溶液中へ、99%テトラクロロ金酸(HAuCl4;アルドリッチ社製)0.075gをミリ−Q水7.5ml中に溶解させた溶液を添加した(金塩に対するアンモニウム塩のモル比:2)。この混合物を室温で30分間の強い電磁撹拌処理に付すことによって、全ての金前駆体を水性相から有機相へ抽出した。水性相はデカント用漏斗内で分離させた後、廃棄した。激しい電磁撹拌下において、有機相へドデカンチオール(0.1ml)を添加し(金前駆体に対するドデカンチオールのモル比:2)、次いで99%ホウ化水素ナトリウム(NaH4B;アルドリッチ社製)0.09gをミリ−Q水6.25mlに溶解させた溶液を滴下した[該還元剤は、金前駆体に対して過剰量(11.7モル)添加した]。数秒後、オレンジ色の溶液は、金属製芯の形成に起因して濃黒色に変色した。強い電磁撹拌を1時間おこなった後、デカント用漏斗を用いて水性相を廃棄した。
98%のテトラオクチルアンモニウムブロミド[N(C8H17)4Br](アルドリッチ社製)0.55gをトルエン(予め乾燥処理と脱ガス処理に付したトルエン)20ml中に溶解させた溶液中へ、99%硝酸パラジウム(Pd(NO3)2;アルドリッチ社製)0.050gを、ミリ−Q水を溶媒とする0.5N塩酸溶液10ml中に溶解させた溶液を添加した。この混合物を室温で30分間の強い電磁撹拌処理に付すことによって、全てのパラジウム前駆体を水性相から有機相へ抽出した。水性相はデカント用漏斗内で分離させた後、廃棄した。激しい電磁撹拌下において、有機相へドデカンチオール(0.1ml)を添加し(パラジウム前駆体に対するドデカンチオールのモル比:2)、次いで電磁撹拌を15分間おこなった後、99%ホウ化水素ナトリウム(NaH4B;アルドリッチ社製)0.10gをミリ−Q水5mlに溶解させた溶液を素早く添加した[該還元剤は、パラジウム前駆体1モルに対して過剰量(12モル)添加した]。数秒後、オレンジ色の溶液は、金属製芯の形成に起因して鈍い色に変色した。この反応は、パラジウムの再酸化を回避するために、窒素雰囲気下でおこなった。強い電磁撹拌を30分間おこなった後、デカント用漏斗を用いて水性相を廃棄した。
2 生体分子
3 磁気センサー
4 保護不動態層
Claims (22)
- 塊状状態では非磁性の貴金属の磁性ナノ粒子(粒径:5nm未満)であって、(a)貴金属から形成される芯、及び(b)少なくとも1つの金属−硫黄共有結合を含む化合物から形成される異方性外層を含む該磁性ナノ粒子。
- 芯用貴金属がAu、Pd、Pt、Ag又は塊状状態で非強磁性のいずれかの他の金属である請求項1記載の磁性ナノ粒子。
- 粒径が1.0〜2.0nm(好ましくは1.2〜1.4nm)である請求項1又は2記載の磁性ナノ粒子。
- 芯がAuから形成され、異方性外層がAu−S化合物とAu−S−R化合物を1/1000〜1000/1(Au−S/Au−S−R)割合で含有する請求項1から3いずれかに記載の磁性ナノ粒子。
- 芯がPdから形成され、異方性外層がPd−S化合物とPd−S−R化合物を1/1000〜1000/1(Pd−S/Pd−S−R)割合で含有する請求項1から3いずれかに記載の磁性ナノ粒子。
- Rが脂肪族鎖若しくは他の分子(特に蛋白質又は他の生体分子)へ結合した脂肪族鎖であり、また、Rがマーカー、蛍光性基又は放射性同位体を含むことができる請求項4又は5記載の磁性ナノ粒子。
- 強磁性挙動を示す請求項1から6いずれかに記載の磁性ナノ粒子。
- 低保磁場を伴う強磁性挙動を示す請求項7記載の磁性ナノ粒子。
- 常磁性挙動を示す請求項1から6いずれかに記載の磁性ナノ粒子。
- 非磁性貴金属の前駆体及び化学量論的に過剰量の一般式HS−Rで表されるチオール誘導体を還元剤の存在下で反応させることを含む請求項1から9いずれかに記載の磁性ナノ粒子の製造方法。
- 非磁性貴金属が金のときに、該前駆体が、テトラクロロ金酸に化学量論的に過剰量のいずれかの第四アンモニウム塩を反応させることによって調製される請求項10記載の方法。
- 非磁性貴金属がパラジウムのときに、該前駆体が、いずれかのパラジウム塩(特に硝酸塩、硫酸塩又は塩化物)に化学量論的に過剰量のいずれかの第四アンモニウム塩を反応させることによって調製される請求項10記載の方法。
- 磁気記録中の情報密度を増大させるために請求項1から9いずれかに記載の磁気ナノ粒子を使用する方法。
- 薬剤の制御放出用器具において請求項1から9いずれかに記載の磁気ナノ粒子を使用する方法。
- 過温症の処置のために請求項1から9いずれかに記載の磁気ナノ粒子を使用する方法。
- 核磁気共鳴における画像の改良のために請求項1から9いずれかに記載の磁気ナノ粒子を使用する方法。
- バイオセンサーとして請求項1から9いずれかに記載の磁気ナノ粒子を使用する方法。
- 磁気印刷において請求項1から9いずれかに記載の磁気ナノ粒子を使用する方法。
- 磁気光学的用途において請求項1から9いずれかに記載の磁気ナノ粒子を使用する方法。
- 符号化において請求項1から9いずれかに記載の磁気ナノ粒子を使用する方法。
- 請求項1から9いずれかに記載の1種若しくは複数種の磁気ナノ粒子の個体群を含むシステム。
- 異なる官能基を有する複数種の磁気ナノ粒子を含む請求項20記載のシステム。
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WO2003025035A2 (de) * | 2001-09-14 | 2003-03-27 | Merck Patent Gmbh | Formkörper aus kern-mantel-partikeln |
WO2003035829A2 (en) * | 2001-10-09 | 2003-05-01 | Nanosphere, Inc. | Nanoparticles having oligonucleotides attached thereto and uses therefor |
JP2003288812A (ja) * | 2001-12-29 | 2003-10-10 | Samsung Electronics Co Ltd | 金属ナノ粒子クラスターインクおよびこれを用いた金属パターン形成方法 |
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WO2005091704A2 (es) | 2005-10-06 |
CA2560892C (en) | 2012-10-16 |
JP5478015B2 (ja) | 2014-04-23 |
AU2005226898A1 (en) | 2005-10-06 |
EP1746610A2 (en) | 2007-01-24 |
ES2242528B1 (es) | 2006-12-01 |
CA2560892A1 (en) | 2005-10-06 |
ES2242528A1 (es) | 2005-11-01 |
US20070151631A1 (en) | 2007-07-05 |
US7960025B2 (en) | 2011-06-14 |
WO2005091704A3 (es) | 2005-12-29 |
ES2401149T3 (es) | 2013-04-17 |
AU2005226898B2 (en) | 2010-05-27 |
EP1746610B1 (en) | 2012-12-19 |
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