JP5865396B2 - 生体適合温度内でキュリー温度を有する磁性ナノ粒子の製造方法及びそれを含む標的物質探知用組成物 - Google Patents
生体適合温度内でキュリー温度を有する磁性ナノ粒子の製造方法及びそれを含む標的物質探知用組成物 Download PDFInfo
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Description
図2は、検出手段が結合されている本発明の一具体例による磁性ナノ粒子を示す図である。
図3は、検出手段が結合されている本発明の他の具体例によるナノ複合体を示す図である。
図4は、本発明の一具体例による標的物質探知用組成物を利用した標的物質の探知過程を示す模式図である。
図5は、本発明の一具体例による磁性ナノ粒子の高分解能透過電子顕微鏡(TEM)の写真を示す。
図6は、本発明の一具体例による磁性ナノ粒子のX−線回折(XRD)パターンを示すグラフである。
図7は、本発明の一具体例による磁性ナノ粒子の磁化値−温度(M-T)のグラフである。
本発明の磁性ナノ粒子は、下記のように熱分解法に基づいて改良されたナノエマルジョン方法で製造された。
希土類金属の前駆体であるランタンアセテルアセトナート(La(acac)3、Aldrich社製)0.45 mmol、2価金属の前駆体であるストロンチウムアセチルアセトナート(Sr(acac)3、Aldrich社製)0.15 mmol、転移金属酸化物の前駆体であるマンガンアセチルアセトナート(Mn(acac)3、Aldrich社製)0.6 mmol及び還元剤である1,2−ヘキサデカンジオール(1,2-hexadecanediol、Aldrich社製)0.1294gを、15 Mlのジオクチルエーテル(Wako社製)があるアルゴンガス雰囲気の容器に入れて溶解させた。その後、前記溶液を100℃に加熱し、前記100℃で1.5時間の間均一に撹拌することで、混合溶液を製造した。
前記製造された混合溶液を280℃に加熱し、前記280℃で1.5時間の間維持させることで、ランタンアセテルアセトナート、 ストロンチウムアセテルアセトナート及びマンガンアセテルアセトナートを、各々1,2−ヘキサデカンジオールとの酸化−還元反応を通じてランタム金属(La)、ストロンチウム金属(Sr)及びマンガン酸化物(MnO3)に還元させた。
前記のように前駆体成分が全て還元された混合溶液を常温で冷却させることで、ランタン金属、ストロンチウム金属及びマンガン酸化物が凝集された磁性ナノ粒子(LaSrMnO3)を形成した。前記磁性ナノ粒子の平均直径は、約30 nmであった。
前記形成された磁性ナノ粒子を無水エチルアルコールに添加し、遠心分離及び磁性分離を利用して洗浄することで、不純物を除去した。
前記洗浄された磁性ナノ粒子をセラミックス容器内に入れて800℃に加熱し、前記800℃で12時間の間維持することで、熱処理を実行した。
前記(1)混合溶液の製造過程で、生体適合性高分子であるポリエチレングリコール−ポリプロピレングリコール−ポリエチレングリコールのブロック共重合体(Aldrich社製)0.1576gを溶媒であるジオクチルエーテル(Wako社製)15 Mlに追加で溶解させたことの以外は、実施例1と同一な方法で、図1のようなナノ複合体を製造した。
前記実施例1で製造された磁性ナノ粒子の形態を測定するために、前記実施例1で製造された磁性ナノ粒子をヘキサンに分散させて、これをcarbon-supperted copper grids上に落としてTEM測定用試片を製造した。その後、EDS(energy-dispersive X-ray spectroscopy)が具備された透過電子顕微鏡(TEM)(Tecnai F20、FEI社製)を使用して、前記試片を観察した。図5は、本発明の一具体例による磁性ナノ粒子の高分解能透過電子顕微鏡(TEM)写真を示す。図5に示したように、スケールバー(Scale bar)は、5nmを示し、実施例1の磁性ナノ粒子は、約30 nmの平均直径を有する。
前記実施例1で製造された磁性ナノ粒子の構造的分析のために、X−線回折分析器を利用して前記実験例1で製造された試片に対するX−線回折分析を実行した。図6は、本発明の一具体例による磁性ナノ粒子のX−線回折(XRD)パターンを示すグラフである。図6に示したように、本発明の磁性ナノ粒子は結晶性が優れることが分かる。
前記実施例1で製造された磁性ナノ粒子の磁性特性を測定するために、VSM(vibrating sample magnetometer)(VSM7300、Lakeshore社製)及びPPMS(physical property measurement system)(Quantum Design社製)を利用して前記実験例1で製造された試片に対する温度による磁化値変化を測定した。図7は、本発明の一具体例による100O e下での磁性ナノ粒子の磁化値−温度(M-T)グラフである。図7に示したように、希土類金属、2価金属及び転移金属酸化物を含む本発明の磁性ナノ粒子(La0.75Sr0.25(MnO3)1)は、310K(37℃)以上で磁化値が0になることが分かる。
10、25: 磁性ナノ粒子
11:生物製剤
12、26:検出手段
20:基板
21:標的物質
22:不純物
23:抗体
24:磁性体
27:巨大複合体
Claims (15)
- 希土類金属、2価金属及び転移金属酸化物を含み、−80℃〜41℃の温度範囲でキュリー温度(curie temperature)を有する磁性ナノ粒子の製造方法であって、
(a)希土類金属の前駆体、2価金属の前駆体及び転移金属酸化物の前駆体を還元させて磁性ナノ粒子を形成する段階と、
(b)前記磁性ナノ粒子をナノ枠に充填して熱処理する段階と、を含むことを特徴とする磁性ナノ粒子の製造方法。 - (a)段階の以前に、希土類金属の前駆体、2価金属の前駆体、転移金属酸化物の前駆体及び還元剤を溶媒に溶解させて、80℃〜130℃の温度で加熱し、前記温度で1時間〜2時間の間均一に混合する段階をさらに含むことを特徴とする請求項1に記載の磁性ナノ粒子の製造方法。
- 混合溶液の製造段階で、希土類金属の前駆体、2価金属の前駆体、転移金属酸化物の前駆体及び還元剤と共に界面活性剤を溶媒に追加で溶解させることを特徴とする請求項2に記載の磁性ナノ粒子の製造方法。
- 還元は、混合溶液を220℃〜300℃で加熱して、前記温度で1時間〜2時間の間維持させることで実行されることを特徴とする請求項2又は3に記載の磁性ナノ粒子の製造方法。
- 磁性ナノ粒子の形成は、混合溶液を常温で冷却させることで実行させることを特徴とする請求項2〜4のいずれかに記載の磁性ナノ粒子の製造方法。
- (a)段階の以後、遠心分離及び磁性分離を利用して磁性ナノ粒子を洗浄する段階をさらに含むことを特徴とする請求項1〜5のいずれかに記載の磁性ナノ粒子の製造方法。
- (b)段階は、磁性ナノ粒子を300℃〜1000℃に加熱し、前記温度で1時間〜13時間の間維持することで実行させることを特徴とする請求項1〜6のいずれかに記載の磁性ナノ粒子の製造方法。
- (b)段階は、非活性気体雰囲気下で実行されることを特徴とする請求項7に記載の磁性ナノ粒子の製造方法。
- (b)段階は、外部磁場下で実行されることを特徴とする請求項7又は8に記載の磁性ナノ粒子の製造方法。
- (b)段階の以前に、磁性ナノ粒子をセラミックス物質または半導体物質でコーティングする段階をさらに含むことを特徴とする請求項1〜9のいずれかに記載の磁性ナノ粒子の製造方法。
- 標的物質に特異的に結合することができる磁性体−抗体複合体と、
前記磁性体−抗体複合体に結合され、希土類金属、2価金属及び転移金属酸化物を含み、−80℃〜41℃の温度範囲でキュリー温度(curie temperature)を有する磁性ナノ粒子と、
前記磁性ナノ粒子の表面に結合した検出手段とを有し、
前記磁性ナノ粒子はキュリー温度未満で前記磁性体と凝集されることを特徴とする標的物質探知用組成物。 - 検出手段は、蛍光物質または量子ドット(quantum dot)であることを特徴とする請求項11に記載の標的物質探知用組成物。
- 蛍光物質は、ローダミンとその誘導体、フルオレセインとその誘導体、クマリンとその誘導体、アクリジンとその誘導体、ピレンとその誘導体、エリトロシンとその誘導体、エオシンとその誘導体及び、4−アセトアミド−4’−イソチオシアナトスチルベン−2,2’−ジスルフォン酸からなる群より選択される一つ以上の物質であることを特徴とする請求項12に記載の標的物質探知用組成物。
- 標的物質は、タンパク質、DNA及びRNAからなる群より選択される一つ以上の物質であることを特徴とする請求項11〜13のいずれかに記載の標的物質探知用組成物。
- タンパク質は、PSA(prostate specific antigen)、CEA(carcinoembryonic antigen)MUC1、AFP(alpha fetoprotein)、CA15-3(carbohydrate antigen15-3)、CA19-9(carbohydrate antigen19-9)、CA125(carbohydrate antigen125)、PSAF(free prostate specific antigen)、PSAC(prostate specific antigen-a1-anticymotrypsin comple)、PAP(prostatic acid phosphatase)、hTG(human thyroglobulin)、HCGb(human chorionic gonadotropin beta)、Ferr(ferritin)、NSE(neuron specific enolase)、IL-2(interleukin2)、IL-6(interleukin6)、B2M(beta2 macroglobulin)及びA2M(alpha2 macroglobulin)からなる群より選択される一つ以上の物質であることを特徴とする請求項14に記載の標的物質探知用組成物。
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| EP3131488A1 (en) | 2014-04-17 | 2017-02-22 | Boston Scientific Scimed, Inc. | Medical devices for therapeutic heat treatments |
| CN104345155A (zh) * | 2014-10-29 | 2015-02-11 | 深圳市第二人民医院 | 甲胎蛋白含量的检测方法 |
| FR3027532A1 (fr) * | 2015-04-10 | 2016-04-29 | Commissariat Energie Atomique | Procede d’elaboration de nanoparticules d’oxyde fonctionnalisees. |
| EP3359141B1 (en) | 2015-10-07 | 2022-02-16 | Boston Scientific Scimed, Inc. | Mixture of lafesih magnetic nanoparticles with different curie temperatures to improve inductive heating efficiency for hyperthermia therapy |
| CN106769162B (zh) * | 2017-02-20 | 2023-06-06 | 广西大学 | 一种透射电镜磁性样品预处理器 |
| US20180292478A1 (en) * | 2017-04-05 | 2018-10-11 | Howard Hughes Medical Institute | Magnetic apparatus |
| CN108241064A (zh) * | 2017-12-21 | 2018-07-03 | 江苏泽成生物技术有限公司 | 一种测定甲状腺球蛋白抗体含量的试剂盒及其测试方法 |
| CN110323056A (zh) * | 2019-06-28 | 2019-10-11 | 武汉理工大学 | 一种解决磁性纳米颗粒在磁性纳米复合材料中团聚的方法 |
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| US20180003676A1 (en) | 2018-01-04 |
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