JP7100857B2 - 生体イメージング用半導体swcnt分散液及びその検査方法 - Google Patents
生体イメージング用半導体swcnt分散液及びその検査方法 Download PDFInfo
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- A61K49/0065—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres the luminescent/fluorescent agent having itself a special physical form, e.g. gold nanoparticle
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Description
(1)大気中で直接紫外線を照射することにより酸化処理された半導体単層カーボンナノチューブと、前記半導体単層カーボンナノチューブの表面をコーティングする両親媒性物質からなる分散剤とを含む半導体SWCNT分散液について、
吸収分光法、フォトルミネッセンス法及び粒子径測定からなる群から選択される少なくとも2種類の方法を用いて、前記半導体単層カーボンナノチューブの平均粒子径が10nmより小さいこと、前記半導体単層カーボンナノチューブの孤立分散性が高いこと、及び/又は前記半導体単層カーボンナノチューブが酸化されていることが確認された前記半導体SWCNT分散液のみから構成される、生体イメージング用半導体SWCNT分散液。
(2)前記粒子径測定が、遠心沈降法による測定である上記(1)に記載の生体イメージング用半導体SWCNT分散液。
(3)大気中で直接紫外線を照射することにより酸化処理された半導体単層カーボンナノチューブと、前記半導体単層カーボンナノチューブの表面をコーティングする両親媒性物質からなる分散剤とを含む生体イメージング用半導体SWCNT分散液の検査方法であって、
吸収分光法、フォトルミネッセンス法及び粒子径測定からなる群から選択される少なくとも2種類の方法を用いて、前記半導体単層カーボンナノチューブの平均粒子径が10nmより小さいこと、前記半導体単層カーボンナノチューブの孤立分散性が高いこと、及び/又は前記半導体単層カーボンナノチューブが酸化されていることを確認する、生体イメージング用半導体SWCNT分散液の検査方法。
(4)前記粒子径測定が、遠心沈降法による測定である上記(3)に記載の生体イメージング用半導体SWCNT分散液の検査方法。
(製造例1)
カーボンナノチューブ(CoMoCAT SG65i、平均直径0.8nm、以下「半導体SWCNT」という)1mgをエタノール10mlに加え、バスソニケーションに5分ほどかけて半導体SWCNTをエタノールに分散させた。続いて、減圧濾過器にオムニポアメンブレン(φ47mm、5μmポアをセットし、半導体SWCNT/エタノール分散液を入れてろ過し、フィルター上に半導体SWCNTを均一に載せた。次に、半導体SWCNTをフィルターに載せたまま薬包紙で挟み、フィルターが丸まらないよう軽く重石をしながら60℃で30分乾燥させた。そして、フィルターに載せた半導体SWCNTをフィルターごと60~70秒オゾン処理した(光源は水銀ランプ、半導体SWCNT上での紫外線強度は約19mW/cm2)。
(製造例2)
カーボンナノチューブ(CoMoCAT SG65i、平均直径0.8nm、以下「半導体SWCNT」という)1mgをエタノール10mlに加え、バスソニケーションに5分ほどかけて半導体SWCNTをエタノールに分散させた。続いて、減圧濾過器にオムニポアメンブレン(φ47mm、5μmポアをセットし、半導体SWCNT/エタノール分散液を入れてろ過し、フィルター上に半導体SWCNTを均一に載せた。次に、半導体SWCNTをフィルターに載せたまま薬包紙で挟み、フィルターが丸まらないよう軽く重石をしながら60℃で30分乾燥させた。そして、フィルターに載せた半導体SWCNTをフィルターごと60~70秒オゾン処理した(光源は水銀ランプ、半導体SWCNT上での紫外線強度は約19mW/cm2)。
(製造例3)
カーボンナノチューブ(CoMoCAT SG65i、平均直径0.8nm、以下「半導体SWCNT」という)1mgをエタノール10mlに加え、バスソニケーションに5分ほどかけて半導体SWCNTをエタノールに分散させた。続いて、減圧濾過器にオムニポアメンブレン(φ47mm、5μmポアをセットし、半導体SWCNT/エタノール分散液を入れてろ過し、フィルター上に半導体SWCNTを均一に載せた。次に、半導体SWCNTをフィルターに載せたまま薬包紙で挟み、フィルターが丸まらないよう軽く重石をしながら60℃で30分乾燥させた。そして、フィルターに載せた半導体SWCNTをフィルターごと60~70秒オゾン処理した(光源は水銀ランプ、半導体SWCNT上での紫外線強度は約19mW/cm2)。
(吸収分光法及びフォトルミネッセンス法による測定)
製造例1~3で得られた生体イメージング用半導体SWCNT分散液について、島津製作所紫外可視近赤外分光光度計UV-3100を用い、吸収スペクトルを測定した。また、980nmを励起波長として、堀場製作所Fluorolog-3-2-iHR320を用いて発光スペクトルを測定した。測定結果をそれぞれ図1及び図2に示す。なお、図1及び図2における吸光度及び発光強度は、分散液の濃度を規格化している。
(粒子径測定)
製造例1~3で得られた生体イメージング用半導体SWCNT分散液について、CPS社製ディスク遠心式粒子径分布測定装置DC24000UHRを用い、遠心沈降法による粒子径測定を行った。その結果を図3に示す。図3の結果から、製造例1~3の生体イメージング用半導体SWCNT分散液における半導体SWCNTの平均粒子径はそれぞれ、8nm、10nm、及び6.5nmであった。また、それぞれの生体イメージング用半導体SWCNT分散液における粒子径が10nmより小さいものの割合はそれぞれ44%、30%、84%であった。遠心分離を1時間行った製造例2に比べて、遠心分離を3時間行った製造例3における半導体SWCNTは、より孤立分散であることが確認された。
(in vivoイメージング)
製造例3及び製造例1で得られた生体イメージング用半導体SWCNT分散液を、SWCNT濃度が200μg/mlになるように0.3%のDSPE-PEG2000溶液で調製した後、0.1mlマウスに投与し、0~6時間後の蛍光を島津製作所SAI-1000装置を用いて観察した。その結果を図4(製造例3)及び図5(製造例1)に示す。
Claims (4)
- 生体イメージング用半導体SWCNT分散液の製造方法であって、
半導体単層カーボンナノチューブに大気中で直接紫外線を照射することにより酸化処理する工程と、
酸化処理した半導体単層カーボンナノチューブを、界面活性剤の溶液中に分散させる工程と、
得られた分散液に、両親媒性物質からなる分散剤を溶解させる工程と、
得られた溶液から、透析によって界面活性剤を除去する工程と、
吸収分光法及び/又はフォトルミネッセンス法と、粒子径測定とを用いて、前記半導体単層カーボンナノチューブの平均粒子径が10nmより小さいことと、前記半導体単層カーボンナノチューブの孤立分散性が、前記界面活性剤の溶液中に分散させる工程を経ずに前記酸化処理した半導体単層カーボンナノチューブを前記両親媒性物質からなる分散剤に直接溶解させたときの前記半導体単層カーボンナノチューブの孤立分散性に比べて高いこと、及び/又は前記半導体単層カーボンナノチューブが酸化されていることを検査する工程と、
を含む生体イメージング用半導体SWCNT分散液の製造方法。 - 前記粒子径測定が、遠心沈降法による測定である請求項1に記載の生体イメージング用半導体SWCNT分散液の製造方法。
- 前記界面活性剤が、アルキルベンゼンスルホン酸塩である請求項1又は2に記載の生体イメージング用半導体SWCNT分散液の製造方法。
- 前記分散剤が、ポリエチレングリコール脂質誘導体である請求項1~3のいずれか一項に記載のイメージング用半導体SWCNT分散液の製造方法。
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