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JP3910183B2 - Immobilization method of colloidal gold - Google Patents
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JP3910183B2 - Immobilization method of colloidal gold - Google Patents

Immobilization method of colloidal gold Download PDF

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JP3910183B2
JP3910183B2 JP2004084761A JP2004084761A JP3910183B2 JP 3910183 B2 JP3910183 B2 JP 3910183B2 JP 2004084761 A JP2004084761 A JP 2004084761A JP 2004084761 A JP2004084761 A JP 2004084761A JP 3910183 B2 JP3910183 B2 JP 3910183B2
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秀一 浅倉
篤 穂積
章雄 不破
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Tanaka Kikinzoku Kogyo KK
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Description

本発明は、ガラス、電極等の基材へ金コロイド粒子を固定する方法に関する。   The present invention relates to a method for fixing gold colloid particles to a substrate such as glass or an electrode.

コロイドとは、金属、セラミックス等からなる直径数十〜数百nmの微小粒子が水等の媒体中を懸濁している状態をいうが、近年、このコロイドを利用して各種の材料、装置を製造する試みがなされている。例えば、バイオチップ(バイオセンサー)の製造への適用が検討されているものとして金コロイド粒子がある。バイオチップとは、生体反応測定に供される機能性デバイスであって、抗体、酵素等の機能タンパク質を実装し、その物理的もしくは化学的信号の有無を検知するためのものである。   Colloid means a state in which fine particles of several tens to several hundreds of nanometers in diameter such as metals and ceramics are suspended in a medium such as water. In recent years, various materials and devices have been utilized using this colloid. Attempts have been made to manufacture. For example, colloidal gold particles are being studied for application to the production of biochips (biosensors). A biochip is a functional device used for biological reaction measurement, and is for mounting functional proteins such as antibodies and enzymes and detecting the presence or absence of physical or chemical signals.

金コロイド粒子をかかる用途に適用するためには、金コロイド粒子を基材へ固定化することが必要となる。ここで、従来、金コロイド粒子への基材への固定化技術として、自己組織化単分子膜(Self−assembled monolayer:以下、SAMと称する。)を金コロイド粒子の下地層として形成する方法が知られている。SAMとは、アミノ(NH)基やチオール(SH)基あるいは、フルオロアルキル(CF)基やメチル(CH)基等の非結合性官能基等を持った長鎖アルキル分子からなる膜であり、アルキル鎖間の相互作用により自発的に配向性の高い単分子層を形成するものをいう。このSAMは、高い密度と秩序化された構造を有することを特徴としており、コロイド粒子の固定化においても高密度で秩序化された層を容易に形成することができることからセンサーや電子デバイス等の製造に好適である。 In order to apply the gold colloidal particles to such a use, it is necessary to fix the gold colloidal particles to the base material. Here, conventionally, as a technique for immobilizing gold colloid particles on a base material, there is a method of forming a self-assembled monolayer (hereinafter referred to as SAM) as an underlayer of gold colloid particles. Are known. SAM is a film composed of long-chain alkyl molecules having non-binding functional groups such as amino (NH 2 ) groups, thiol (SH) groups, fluoroalkyl (CF 3 ) groups, and methyl (CH 3 ) groups. And which spontaneously forms a highly oriented monomolecular layer by interaction between alkyl chains. This SAM is characterized by having a high density and an ordered structure, and can easily form a high-order ordered layer even in the fixation of colloidal particles. Suitable for manufacturing.

図5は、SAMを用いて金コロイド粒子を固定化したバイオチップ1の構造を示す。図5において、バイオチップは、必要に応じてITO透明電極を備えたガラス等からなる基材10と、基材上に形成されたSAM層11と、金コロイド粒子層12とを備え、金コロイド層12上に酵素等の検出目的に応じた機能タンパク質13が配置されている。このバイオチップでは、測定対象となる検体に対し、機能タンパク質13が反応し、その際の電流が金コロイド粒子層12、SAM層11を通じて検出されるようになっている。   FIG. 5 shows the structure of the biochip 1 on which colloidal gold particles are immobilized using SAM. In FIG. 5, the biochip includes a base material 10 made of glass or the like with an ITO transparent electrode as necessary, a SAM layer 11 formed on the base material, and a gold colloid particle layer 12. A functional protein 13 corresponding to the detection purpose such as an enzyme is disposed on the layer 12. In this biochip, the functional protein 13 reacts with the specimen to be measured, and the current at that time is detected through the gold colloid particle layer 12 and the SAM layer 11.

また、図6は、SAMを用いた金コロイド粒子の固定化方法の概略を示すものである。この従来の金コロイド粒子の固定化法では、基材の洗浄後、SAMの原料となる有機化合物から気相で成長(SAMの種類によっては液相で浸漬により製造するものもある)させ、形成したSAMを備える基材を金コロイド溶液に浸漬させることで金コロイド粒子の固定化がなされる。   FIG. 6 shows an outline of a method for immobilizing gold colloid particles using SAM. In this conventional method for fixing colloidal gold particles, after the substrate is washed, it is grown in the gas phase from an organic compound that is the raw material of the SAM (some SAMs are produced by immersion in the liquid phase) and formed. The base material provided with the SAM is immersed in a gold colloid solution to fix the gold colloid particles.

ところで、従来、金コロイドの固定化において適用されるSAMとしては、例えば、SH基終端のメルカプトプロピルトリメトキシシラン(以下、MPTMSと称する。)や、NH基終端のアミノプロピルトリメトキシシラン(以下、APTMSと称する。)等を用いたものが知られている。
Jen−Yung Tsengら,Colloid and Surfaces A182(2001),239−245. YongDong Jin and Shaojun Dong、CHEM COMMUN.,(2002),1780−1781.
By the way, conventional SAMs applied in the fixation of colloidal gold include, for example, SH group-terminated mercaptopropyltrimethoxysilane (hereinafter referred to as MPTMS) and NH 2 group-terminated aminopropyltrimethoxysilane (hereinafter referred to as MPTMS). , APTMS, etc.) are known.
Jen-Yung Tseng et al., Colloid and Surfaces A182 (2001), 239-245. YongDong Jin and Shaojung Dong, CHEM COMMUN. , (2002), 1780-1781.

上記したSAMを適用する金コロイド粒子の固定化技術では、確かに金コロイドを高密度で固定化することができる。しかし、これらの方法では次のような問題がある。即ち、MPTMSからなるSAMによる場合、この化合物はチオール基を含有することから人体適合性の問題がある。金コロイド粒子は上記したバイオチップの他、特定の薬物(ドラッグ)捕獲した状態で人体内へ搬送するドラッグデリバリーシステムへも応用可能であるが、かかる用途へ適用する場合、チオール基は生体内の鉛と結合しやすく、その結果、酵素・タンパク質等の働きを阻害するため、これを使用することは好ましくない。一方、NH2終端のAPTMSを適用する場合には、かかる人体適合性の問題は少ないが、SAMを使用することの共通の問題として、バイオチップ、電子デバイスへの応答性への影響が懸念される。これは、図5で示したように、バイオチップでは先端の機能性タンパク質の反応による電気信号は、金コロイド粒子からSAMを経由して基材へ到達するため、SAMがある分の応答性の低下が懸念されるのである。   In the gold colloid particle immobilization technology to which the above SAM is applied, the gold colloid can surely be immobilized at a high density. However, these methods have the following problems. That is, in the case of SAM composed of MPTMS, this compound has a problem of human compatibility because it contains a thiol group. In addition to the biochip described above, colloidal gold particles can be applied to drug delivery systems in which a specific drug (drug) is captured and transported to the human body. It is not preferable to use this because it easily binds to lead and consequently inhibits the action of enzymes, proteins and the like. On the other hand, when NH2-terminated APTMS is applied, the human compatibility problem is small. However, as a common problem of using the SAM, there is a concern about the influence on the responsiveness to the biochip and the electronic device. . As shown in FIG. 5, in the biochip, the electrical signal generated by the reaction of the functional protein at the tip reaches the base material from the colloidal gold particles via the SAM. There is concern about the decline.

本発明は、以上のような背景のもとになされたものであり、金コロイド粒子を基材上へ固定化する方法であって、上記のような問題を考慮することなく、かつ、高密度で良好な結合性でもって金コロイド粒子を固定化するものを提供することを目的とする。   The present invention has been made based on the background as described above, and is a method for immobilizing gold colloidal particles on a substrate, without considering the above-described problems, and with a high density. An object of the present invention is to provide a method for immobilizing colloidal gold particles with good binding properties.

本発明者等は、本件課題を解決すべく検討を行い、その過程でSAMを適用することなく金コロイドを基材へ固定化する手法に想到した。この方法は、OH基終端又はCOOH基の親水性に修飾された基材表面に対し金コロイド粒子が効果的に固定化できるとの発見により完成されたものである。   The inventors of the present invention have studied to solve this problem, and have come up with a technique for immobilizing gold colloid to a substrate without applying SAM in the process. This method has been completed by the discovery that colloidal gold particles can be effectively immobilized on the surface of a substrate modified with OH group termination or COOH group hydrophilicity.

本発明は、金コロイド粒子を基材表面に固定化する方法において、前記基材表面をOH基終端又はCOOH基終端で覆われた親水性とする表面修飾処理を行った後、基材表面と金コロイド粒子とを接触させることを特徴とする金コロイドの固定化法である。   The present invention relates to a method for immobilizing gold colloid particles on a substrate surface, after performing a surface modification treatment to make the substrate surface hydrophilic with an OH group-terminated or COOH-terminated end, A method for immobilizing gold colloid characterized by contacting with gold colloid particles.

以下、本発明につき詳細に説明する。本発明では、まず、基材を修飾処理し、基材表面をOH基終端又はとCOOH基終端する。金コロイドを固定化する基材には特に制限はなく、ガラス基材、Si/SiO基材、ITOのような透明電極を備えたものや、PET、PMMA、PS等のポリマー基材にも本発明は適用可能である。また、後述するように、まずMPTMS等のSAMを形成した後に行なっても金コロイドの固定化は可能である。紫外光照射によりSAMは分解、除去され、基材表面はOH基終端となるからである。表面修飾処理の手法としては、X線、電子線、ガンマ線、化学処理、紫外光照射のいずれかにより可能であり、例えば、基材を純水中で超音波洗浄するような処理のみでも可能である。但し、金コロイド粒子の固定をより確実なものとする特に好ましい方法としては、紫外光照射を行なうことによるものである。この紫外光照射による表面修飾処理の際の紫外光波長は、126〜254nmとするのが好ましい。また、紫外光の照射時間は、金属又は半導体基材の場合は、10分以上照射すれば十分に親水化される。一方、ポリマー基材の場合、紫外光によってポリマーが分解され、長時間の照射は基材の変形、黄変が生じるため、30分以内とするのが好ましい。 Hereinafter, the present invention will be described in detail. In the present invention, first, the base material is modified, and the surface of the base material is terminated with an OH group or a COOH group. There are no particular limitations on the base material on which the colloidal gold is immobilized, including glass base materials, Si / SiO 2 base materials, those equipped with transparent electrodes such as ITO, and polymer base materials such as PET, PMMA, and PS. The present invention is applicable. Also, as will be described later, the colloidal gold can be immobilized even after the SAM such as MPTMS is first formed. This is because the SAM is decomposed and removed by irradiation with ultraviolet light, and the surface of the base material is terminated with an OH group. As a surface modification treatment method, X-ray, electron beam, gamma ray, chemical treatment, or ultraviolet light irradiation can be used. For example, the substrate can be treated only by ultrasonic cleaning in pure water. is there. However, a particularly preferable method for ensuring the fixation of the colloidal gold particles is by performing ultraviolet light irradiation. The ultraviolet light wavelength in the surface modification treatment by ultraviolet light irradiation is preferably 126 to 254 nm. Further, in the case of a metal or semiconductor substrate, the irradiation time of ultraviolet light is sufficiently hydrophilized by irradiation for 10 minutes or more. On the other hand, in the case of a polymer substrate, since the polymer is decomposed by ultraviolet light and long-time irradiation causes deformation of the substrate and yellowing, it is preferably within 30 minutes.

修飾処理後の金コロイドの固定化は、溶媒に金コロイド粒子が分散するコロイド溶液を用い、これに処理後の基材を浸漬するものが好ましい。ここで、金コロイド溶液には、溶媒、金コロイド粒子に加えて保護剤が添加されているのが一般的である。保護剤とは、コロイド溶液中でコロイド粒子の周辺に化学的又は物理的に結合、吸着する化合物であって、コロイド粒子同志の凝集を抑制し粒径分布を適性範囲に制御し安定化させるものをいう。この保護剤としては、金コロイド粒子に対して化学的又は物理的に結合、吸着することができる有機化合物であれば、特に、限定はなく、ポリビニルピロリドン(以下、PVPという。)、ポリエチレンイミン(以下、PEIという。)、ポリアクリル酸(以下、PAAという。)、カルボキシメチルセルロース(以下、CMCという。)、ポリビニルアルコール(以下、PVAという。)の他、クエン酸、アスコルビン酸、酒石酸、コハク酸、シュウ酸、マレイン酸等の有機酸又はそのアルカリ金属塩若しくはそのアンモニウム塩、更には、ポリ(N−カルボキシメチル)アリルアミン、ポリ(N,N−ジカルボキシメチル)アリルアミン、ポリ(N−カルボキシメチル)エチレンイミン等の有機化合物が適用できる。また、金コロイド溶液中の金コロイド粒子の含有量は、0.004〜0.01重量%のものが好ましい。   The gold colloid after the modification treatment is preferably immobilized by using a colloidal solution in which gold colloid particles are dispersed in a solvent and immersing the treated substrate in this. Here, the colloidal gold solution generally contains a protective agent in addition to the solvent and colloidal gold particles. A protective agent is a compound that chemically or physically binds and adsorbs around colloidal particles in a colloidal solution, and suppresses agglomeration of colloidal particles and controls the particle size distribution within an appropriate range for stabilization. Say. The protective agent is not particularly limited as long as it is an organic compound that can be chemically or physically bonded to and adsorbed on colloidal gold particles. Polyvinylpyrrolidone (hereinafter referred to as PVP), polyethyleneimine ( Hereinafter, in addition to PEI), polyacrylic acid (hereinafter referred to as PAA), carboxymethylcellulose (hereinafter referred to as CMC), polyvinyl alcohol (hereinafter referred to as PVA), citric acid, ascorbic acid, tartaric acid, succinic acid. Organic acids such as oxalic acid and maleic acid or alkali metal salts or ammonium salts thereof, poly (N-carboxymethyl) allylamine, poly (N, N-dicarboxymethyl) allylamine, poly (N-carboxymethyl) ) Organic compounds such as ethyleneimine are applicable. Further, the content of gold colloid particles in the gold colloid solution is preferably 0.004 to 0.01% by weight.

金コロイド溶液に基材を浸漬する際の浸漬時間は、10〜70分間とするのが好ましい。10分未満では金コロイド粒子が完全に固定化されないからである。また、70分を超えて浸漬すると、金コロイドが凝集して単層で固定化されないからである。   The immersion time when the substrate is immersed in the gold colloid solution is preferably 10 to 70 minutes. This is because the colloidal gold particles are not completely immobilized in less than 10 minutes. Moreover, it is because a gold colloid will aggregate and it will not be fix | immobilized by a single layer when immersed for more than 70 minutes.

更に、本発明ではコロイド溶液のpHの調整が重要である。好ましいpHの範囲は、2.0〜6.0であり、特に好ましいpHは3.5〜4.5である。コロイド溶液のpHが2.0未満及び6.0を超える場合、金コロイド粒子の固定化は生じないからである。   Furthermore, in the present invention, it is important to adjust the pH of the colloidal solution. A preferable pH range is 2.0 to 6.0, and a particularly preferable pH is 3.5 to 4.5. This is because when the pH of the colloidal solution is less than 2.0 and more than 6.0, the gold colloid particles are not fixed.

上記した、表面修飾処理、金コロイド粒子の接触の2工程で金コロイドの固定化は完了する。後は基材を取り出し、乾燥等の適宜の後処理を行い、表面に機能タンパク質を固定するなどして利用に供することができる。   Immobilization of the gold colloid is completed in the above-described two steps of surface modification treatment and contact with the colloidal gold particles. Thereafter, the base material can be taken out and subjected to appropriate post-treatment such as drying, and the functional protein can be immobilized on the surface and used.

本発明では微細なパターンニングも可能である。即ち、基材への表面修飾処理を部分的、局所的に行った後に基材とコロイド粒子とを接触させることで、所望のパターンで固定化することができる。例えば、図1(a)のように、パターン以外の箇所をマスキングして紫外光照射を行なうことで、OH基終端のパターンを形成することパターンニングできる。また、本発明者等によれば、金コロイド粒子の固定化はSH終端の表面でも生じるが、OH基終端部とSH基終端部とが共存する場合には、OH基終端部に優先的に固定化されることが確認されている。従って、図1(b)のように、先ず基材全体にSAMを形成しSH基終端となるようにした後に、マスキングを行って紫外光照射することで、SAMを分解、除去し、OH基終端部のパターンを形成した後に金コロイド粒子を固定化してもパターン形成が可能である。   In the present invention, fine patterning is also possible. In other words, the substrate can be fixed in a desired pattern by bringing the substrate into contact with the colloidal particles after the surface modification treatment on the substrate is partially or locally performed. For example, as shown in FIG. 1A, patterning can be performed by forming a pattern having an OH group terminal by masking a portion other than the pattern and performing ultraviolet light irradiation. According to the present inventors, the fixation of colloidal gold particles also occurs on the surface of the SH terminal, but when the OH group terminal part and the SH group terminal part coexist, the OH group terminal part is preferentially used. It has been confirmed that it is immobilized. Therefore, as shown in FIG. 1 (b), first, SAM is formed on the entire substrate to be the SH group end, and then masked and irradiated with ultraviolet light to decompose and remove SAM, The pattern can be formed even if the colloidal gold particles are fixed after the pattern of the terminal portion is formed.

本発明によれば、金コロイド粒子を基材に直接的に固定化することができる。従って、従来法のように、基材にSAMを形成する工程が不要となり、固定化のための工程数を削減し、バイオチップ等の生産効率を向上させることができる。   According to the present invention, colloidal gold particles can be directly immobilized on a substrate. Therefore, unlike the conventional method, the step of forming the SAM on the substrate becomes unnecessary, the number of steps for immobilization can be reduced, and the production efficiency of biochips and the like can be improved.

本発明の適用例としては、バイオチップの機能タンパク質の下地層形成が先ず挙げられるが、本発明によれば、基材に直接的に金コロイド粒子層を形成することができるため、従来のようにSAMが介在している場合に比べて応答性が良好なチップを製造することができる。これは、バイオチップ以外の電子デバイスの製造にも有用である。   As an application example of the present invention, formation of a base layer of a functional protein of a biochip is first mentioned. However, according to the present invention, a colloidal gold particle layer can be directly formed on a substrate. As compared with the case where SAM is interposed in the chip, it is possible to manufacture a chip having better responsiveness. This is also useful for manufacturing electronic devices other than biochips.

また、上記のように本発明による金コロイド粒子の固定化法では、金コロイドの固定化にpH感応性がある。この特性を利用すれば、本発明は特定の薬剤、酵素、タンパク質を人体へ輸送するドラッグデリバリーシステムへの応答も有望である。即ち、本発明により固定化される金コロイドは、雰囲気のpHが2.0〜6.0を外れると、基材からの拘束を解かれ基材から離脱する。従って、ドラッグ調整時のpHを上記範囲で行い、これを人体へ投与することで所定のpHとなる部位でドラッグを放出するようにすることでドラッグの集中的、効果的投与が可能となる。この点、従来用いられていたMPTMSも用いる金コロイド粒子の固定化法でも、pH感応性はあるが、MPTMSは人体にとって好ましくない物質であることからかかる用途への適用は問題があるが、本発明ではこのような物質を利用することなく、また、金は人体への適合性も良好であることから、本発明はかかる用途への応用について有望である。尚、これらの用途に供するため、本発明では、基材に金コロイド粒子を単層で固定化したものが好ましい。   Further, as described above, in the method for immobilizing gold colloid particles according to the present invention, the gold colloid is immobilized with pH sensitivity. If this characteristic is utilized, the present invention has a promising response to a drug delivery system that transports a specific drug, enzyme, or protein to the human body. That is, the colloidal gold immobilized according to the present invention is released from the substrate by releasing the constraint from the substrate when the pH of the atmosphere deviates from 2.0 to 6.0. Therefore, the drug can be intensively and effectively administered by adjusting the drug in the above-mentioned range and releasing the drug at a predetermined pH by administering it to the human body. In this respect, the conventional gold colloid particle immobilization method using MPTMS is also pH-sensitive, but MPTMS is an unfavorable substance for the human body. The present invention is promising for application to such uses without using such substances in the invention and because gold has good compatibility with the human body. In addition, in order to use for these uses, in this invention, what fixed the gold colloid particle to the base material by the single layer is preferable.

以下、本発明の好適な実施形態を図面と共に説明する。   Preferred embodiments of the present invention will be described below with reference to the drawings.

第1実施形態:Si/SiO基材(寸法1.0×1.0cm)を前処理として、アセトン中での10分間の超音波洗浄を3回繰り返し、更に超純水中での10分間の超音波洗浄を3回繰り返した。そして、この基材に真空紫外光(光源:エキシマランプ)を大気圧雰囲気で15分間照射して基材表面の修飾処理を行なった。 First embodiment : Si / SiO 2 substrate (size: 1.0 × 1.0 cm) as a pretreatment, ultrasonic cleaning for 10 minutes in acetone is repeated three times, and further for 10 minutes in ultrapure water. The ultrasonic cleaning was repeated 3 times. Then, the substrate surface was modified by irradiating the substrate with vacuum ultraviolet light (light source: excimer lamp) in an atmospheric pressure atmosphere for 15 minutes.

表面修飾処理後、基材を金コロイド溶液に浸漬した。この金コロイド溶液は、保護剤をクエン酸ナトリウムとし、金濃度0.007重量%のものを用いた。ここでは、コロイド溶液のpHを1.5、2.0、3.5、4.0、4.5、5.0、5.5、6.5と調整したものを用意し、それぞれについて複数用意した基材を浸漬した。浸漬時間は全て60分間とした。   After the surface modification treatment, the substrate was immersed in a colloidal gold solution. The colloidal gold solution used was sodium citrate as the protective agent and a gold concentration of 0.007% by weight. Here, prepared are prepared by adjusting the pH of the colloidal solution to 1.5, 2.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.5, and a plurality of each. The prepared base material was immersed. All immersion times were 60 minutes.

以上の金コロイド粒子の固定化工程を図2に示す。そして、異なるpHのコロイド溶液について行なった金コロイド粒子固定化の良否を表1に示す。また、図3は、pH3.5、5.0としたときの基材表面の形態を示す原子間力顕微鏡の像である。   FIG. 2 shows the fixing process of the colloidal gold particles. Table 1 shows the quality of gold colloid particle immobilization performed on colloidal solutions having different pHs. FIG. 3 is an atomic force microscope image showing the form of the substrate surface when pH is 3.5 and 5.0.

Figure 0003910183
Figure 0003910183

表1から、金コロイド粒子は、pH2.0〜5.5まででは固定化が可能であり、特に3.5〜4.5の範囲では良好な状態で固定化できることがわかる。また、この範囲を超えると固定化が不可能となることがわかる。   From Table 1, it can be seen that the colloidal gold particles can be immobilized at a pH of 2.0 to 5.5, and can be immobilized in a good state particularly in the range of 3.5 to 4.5. It can also be seen that immobilization becomes impossible beyond this range.

第2実施形態:ここでは、上記で説明した金コロイド粒子固定化によるパターンニングの確認を行なった。先ず、第1実施形態と同様のSi/SiO基材を第1実施形態と同様の工程で洗浄し、真空紫外光(光源:エキシマランプ)を大気圧雰囲気で15分間照射した。そして、この基材をPTFE容器(容量180cm)に、MPTMS200μLを脱水トルエン700μLで希釈したものと共に封入し、PTFE容器を炉に入れ、80℃で3時間加熱し、MPTMS−SAMを形成した。 Second Embodiment : Here, the patterning confirmation by the gold colloid particle immobilization described above was confirmed. First, the same Si / SiO 2 substrate as in the first embodiment was washed in the same process as in the first embodiment, and irradiated with vacuum ultraviolet light (light source: excimer lamp) in an atmospheric pressure atmosphere for 15 minutes. And this base material was enclosed with a PTFE container (capacity 180 cm 3 ) together with 200 μL of MPTMS diluted with 700 μL of dehydrated toluene, and the PTFE container was placed in a furnace and heated at 80 ° C. for 3 hours to form MPTMS-SAM.

次に、この基材にフォトマスクでパターン形成し、その上に基板とフォトマスクとの密着性を高めるための重しとして石英ガラスを載置し、これに真空紫外光(光源:エキシマランプ)を1.0×10Paの雰囲気中で30分間照射し、パターン上のSAMを分解、除去した。   Next, a pattern is formed on the base material with a photomask, and quartz glass is placed thereon as a weight for improving the adhesion between the substrate and the photomask, and vacuum ultraviolet light (light source: excimer lamp) is placed thereon. Was irradiated in an atmosphere of 1.0 × 10 Pa for 30 minutes to decompose and remove the SAM on the pattern.

以上の処理がなされた基材を第1実施形態と同様の金コロイド溶液(pH3.5)に60分間浸漬した。   The base material subjected to the above treatment was immersed in the same colloidal gold solution (pH 3.5) as in the first embodiment for 60 minutes.

図4は、コロイド溶液に浸漬後の基材表面の形態を示す原子間力顕微鏡の平面及び断面画像写真である。図から明らかなように、この実施形態では明瞭な金微粒子のパターン(段差約20nm)が形成できたことが確認できる。   FIG. 4 is a plane and cross-sectional image photograph of an atomic force microscope showing the form of the substrate surface after being immersed in the colloidal solution. As is apparent from the figure, it can be confirmed that a clear gold fine particle pattern (step difference of about 20 nm) was formed in this embodiment.

本発明を適用して金コロイド粒子のパターンニングを行う工程を説明する図。The figure explaining the process of patterning a gold colloid particle by applying this invention. 本発明を適用して金コロイド粒子のパターンニングを行う工程を説明する図(SAM形成経由)。The figure explaining the process of patterning gold colloid particles by applying the present invention (via SAM formation). 第1実施形態の金コロイド粒子固定化工程の概略を示す図。The figure which shows the outline of the colloidal gold particle fixed process of 1st Embodiment. 第1実施形態の金コロイド粒子固定化後の基材表面の形態を示す写真。The photograph which shows the form of the base-material surface after gold colloid particle fixation of 1st Embodiment. 第2実施形態の金コロイド粒子をパターン化して固定化した後の基材表面の形態を示す写真。The photograph which shows the form of the base-material surface after patterning and fixing the gold colloid particle of 2nd Embodiment. SAMを適用するバイオチップの構造を示す図。The figure which shows the structure of the biochip to which SAM is applied. SAMを用いた金コロイド粒子の固定化方法の概略を示す図。The figure which shows the outline of the fixing method of the gold colloid particle using SAM.

符号の説明Explanation of symbols

10 基材
11 SAM層
12 金コロイド粒子層
13 機能タンパク質
DESCRIPTION OF SYMBOLS 10 Base material 11 SAM layer 12 Gold colloid particle layer 13 Functional protein

Claims (4)

金コロイド粒子を基材表面に直接的に固定化する方法において、
前記基材表面の少なくとも一部に波長126〜254nmの紫外光を照射し、基材表面の少なくとも一部をOH基終端又はCOOH基終端で覆われた親水性とする表面修飾処理を行った後、
前記基材を、溶媒に金コロイド粒子が分散するpH3.5〜4.5のコロイド溶液に10〜70分間浸漬して金コロイド粒子を固定化することを特徴とする金コロイドの固定化法。
In the method of directly immobilizing colloidal gold particles on the substrate surface,
After performing a surface modification treatment that irradiates at least a part of the substrate surface with ultraviolet light having a wavelength of 126 to 254 nm and makes at least a part of the substrate surface hydrophilic with an OH group terminal or a COOH group terminal. ,
A method for immobilizing gold colloid, wherein the substrate is immersed in a colloidal solution having a pH of 3.5 to 4.5 in which gold colloid particles are dispersed in a solvent for 10 to 70 minutes to immobilize the gold colloid particles .
基材への表面修飾処理を部分的に行った後、基材を金コロイド溶液に浸漬し、所望のパターンで金コロイド粒子を固定化する請求項1記載の金コロイドの固定化法。 The gold colloid immobilization method according to claim 1, wherein after the surface modification treatment is partially performed on the base material , the base material is immersed in a colloidal gold solution to fix the gold colloid particles in a desired pattern. 基材への部分的な表面修飾処理として、フォトマスク、TEMグリッドのパターンマスクを形成した後、紫外光を照射して基材表面の少なくとも一部をOH基終端又はCOOH基終端で覆われた親水性とする請求項2記載の金コロイドの固定化法。 As a partial surface modification treatment for the substrate, a photomask and a TEM grid pattern mask were formed, and then ultraviolet light was irradiated to cover at least part of the substrate surface with an OH group terminal or a COOH group terminal. The method for immobilizing gold colloid according to claim 2, wherein the method is hydrophilic . 金コロイド粒子を単層で固定化する請求項1〜請求項3のいずれか1項に記載の金コロイドの固定化法。 The method for immobilizing gold colloid according to any one of claims 1 to 3, wherein the colloidal gold particles are immobilized in a single layer.
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