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基于離子型銥配合物電致化學(xué)發(fā)光-電聚合分子印跡識(shí)別檢測(cè)可待因的新型方法

文檔序號(hào):9785376閱讀:530來(lái)源:國(guó)知局
基于離子型銥配合物電致化學(xué)發(fā)光-電聚合分子印跡識(shí)別檢測(cè)可待因的新型方法
【技術(shù)領(lǐng)域】
[0001]本發(fā)明公開(kāi)了一種基于離子型銥配合物電致化學(xué)發(fā)光-電聚合分子印跡識(shí)別的可待因新型檢測(cè)方法,涉及材料學(xué)、光化學(xué)、電化學(xué)等領(lǐng)域。
【背景技術(shù)】
[0002]可待因,又稱磷酸甲基嗎啡。在病理和生理方面得到廣泛的應(yīng)用,如治愈咳嗽、鎮(zhèn)靜、緩解疼痛;但又被列入毒品的范疇,是查禁的重要對(duì)象。對(duì)該物質(zhì)常用的檢測(cè)方法有氣相色譜-紫外可見(jiàn)聯(lián)用、氣相色譜-質(zhì)譜聯(lián)用、高效液相-質(zhì)譜聯(lián)用法,但這些分析方法檢測(cè)水平局限于微摩爾級(jí)別[1—4],而且儀器龐大,耗時(shí)較長(zhǎng),在某些方面使用受到限制。近來(lái),陳曦課題組用電化學(xué)發(fā)光法檢測(cè)可待因,檢測(cè)限可達(dá)到5.0X10—9H1l.L—1[5]。
[0003]早在上世紀(jì)七十年代電化學(xué)發(fā)光發(fā)展的初期,三聯(lián)吡啶釕體系一直是人們的研究熱點(diǎn)[6—7],但由于應(yīng)用在水溶液體系中,浪費(fèi)試劑,價(jià)格昂貴。人們便另辟蹊徑,將三聯(lián)吡啶釕固定化制得電化學(xué)發(fā)光傳感器[8—1()]。又因三聯(lián)吡啶釕易溶于水,固定化中容易脫落,則用金屬銥配合物取而代之。金屬銥配合物與釕配合物化學(xué)性質(zhì)相似,其不溶于水,發(fā)光效率較高,在電化學(xué)發(fā)光中具有潛在的應(yīng)用價(jià)值。Bae YJ等人利用硅納米粒子包埋技術(shù)將銥配合物固定在ITO電極表面[11]。董永平等人利用離子交換技術(shù)將銥配合物和Naf1n制成復(fù)合膜材料對(duì)電極進(jìn)行修飾,該電極成功用于檢測(cè)水溶液中的草酸根離子[12]。將銥配合物固定化具有廣泛的應(yīng)用前景。
[0004]僅僅將銥配合物固定化制備的傳感器靈敏度高,重現(xiàn)性佳,但選擇性略微不足。分子印跡技術(shù)可以提供分析方法的特異性,除去印跡分子,生成具有與印跡分子大小、形狀、結(jié)構(gòu)相匹配的空穴,因此可以有選擇性地識(shí)別印跡分子。以其顯著的特點(diǎn),分子印跡技術(shù)現(xiàn)已廣泛用于化學(xué)傳感器、生物傳感器和分離技術(shù)等方面[13—15]。因此,將電致化學(xué)發(fā)光與分子印跡技術(shù)聯(lián)合使用可以消除背景干擾,提高傳感器的靈敏度和選擇性。分子印跡技術(shù)最重要的步驟就是制備分子印跡膜,目前的方法有原位引發(fā)聚合法、電化學(xué)聚合法、涂附法、自組裝法[16—18]。電聚合法具有耗時(shí)短,直接成膜的優(yōu)點(diǎn),而且電聚合的時(shí)間長(zhǎng)短、電壓、電流參數(shù)可以控制成膜的厚度,實(shí)現(xiàn)成膜的可控性。
[0005]本發(fā)明首次基于離子型銥配合物電致化學(xué)發(fā)光和可待因分子印跡識(shí)別兩種技術(shù)聯(lián)用檢測(cè)可待因,靈敏度較高,選擇性好,在1.0 X 10—n-5.0 X 10—9H1l.L—1有很好的線性,線性方程為Iecl=I1.211og C+127.98,r = 0.9962,檢出限達(dá)到9.23 X 10—12mol.L—HS/N =3)0
[0006]參考文獻(xiàn)
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【發(fā)明內(nèi)容】

[0025]本發(fā)明的目的是提供一種基于電致化學(xué)發(fā)光-分子印跡識(shí)別技術(shù)聯(lián)用快速檢測(cè)可待因的新型方法。該方法具有低檢測(cè)限、較高靈敏度和選擇性。其特征在于:
[0026]首先制備第一層,將一定量的Naf1n溶液、多壁碳納米管、離子型銥配合物按比例加入到SOOuL異丙醇中用混旋儀攪勻,取少量以上分散液滴涂于裸玻碳電極表面,室溫干燥111,待電極自然瞭干即可制得[(^9-0013)211'((1(^7)]+??6—/]\^01'/似:[>;!_011電致化學(xué)發(fā)光電極。
[0027]其次,在制備好的第一層基礎(chǔ)上,采用電聚合方法將溶膠-凝膠膜聚合到電極表面,溶膠混合液由75uL苯基三甲氧基硅烷(PTMOS)、75uL四乙氧基硅烷(TEOS)、700uL H2O,IlOOyL無(wú)水乙醇、50yL HC1(1.0X 10—Vol.L—O組成,超聲兩小時(shí)后加入模板分子可待因溶液50yL(l.0 X 10—Vol.L—O,超聲
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