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        基于液相色譜串聯(lián)高分辨質(zhì)譜的動(dòng)物源農(nóng)產(chǎn)品獸藥殘留檢測(cè)研究綜述

        2020-04-17 09:53:15王卉劉慶菊韓平
        江蘇農(nóng)業(yè)科學(xué) 2020年2期
        關(guān)鍵詞:獸藥液相質(zhì)譜

        王卉 劉慶菊 韓平

        摘要:液相色譜-高分辨質(zhì)譜(LC-HRMS)具有高分辨率、高通量、高精確度等優(yōu)勢(shì),在動(dòng)物源農(nóng)產(chǎn)品的獸藥殘留檢測(cè)研究中顯示出極大的潛力。本文綜述了2014—2018年LC-HRMS檢測(cè)動(dòng)物源農(nóng)產(chǎn)品中獸藥殘留的應(yīng)用研究進(jìn)展。其中,QuEChERS方法和有機(jī)溶劑提取法是常用的獸藥殘留提取方法,提取液用PSA、C18和氧化鋁等吸附劑凈化,綠色的樣品前處理方法是未來(lái)的發(fā)展趨勢(shì);液相系統(tǒng)和色譜柱的改良,使獸藥化合物得到更好的分離,提高了質(zhì)譜檢測(cè)的靈敏度;HRMS分辨率和靈敏度的提高,增強(qiáng)了LC-HRMS定性定量分析動(dòng)物源農(nóng)產(chǎn)品中獸藥殘留的能力;數(shù)據(jù)處理軟件的開(kāi)發(fā)和應(yīng)用,提高了LC-HRMS在獸藥殘留檢測(cè)中的工作效率。盡管LC-HRMS在獸藥殘留檢測(cè)中取得了進(jìn)展,但仍存在不足和發(fā)展空間。

        關(guān)鍵詞:液相色譜(LC)-高分辨質(zhì)譜(HRMS);動(dòng)物源農(nóng)產(chǎn)品;獸藥殘留;樣品前處理;色譜分離;質(zhì)譜檢測(cè);數(shù)據(jù)處理

        中圖分類(lèi)號(hào): TS207.5+3

        文獻(xiàn)標(biāo)志碼: A

        文章編號(hào):1002-1302(2020)02-0057-08

        收稿日期:2018-11-08

        作者簡(jiǎn)介:王 卉(1982—),女,內(nèi)蒙古鄂倫春人,博士,助理研究員,主要從事農(nóng)產(chǎn)品安全檢測(cè)工作。E-mail:wangh@brcast.org.cn。

        通信作者:韓 平,副研究員,主要從事農(nóng)產(chǎn)品安全檢測(cè)工作。E-mail:hanp@brcast.org.cn。

        獸藥殘留是畜禽產(chǎn)品質(zhì)量的主要監(jiān)控指標(biāo),獸藥的不科學(xué)使用會(huì)導(dǎo)致動(dòng)物體內(nèi)藥物蓄積,對(duì)人類(lèi)及環(huán)境產(chǎn)生慢性、長(zhǎng)遠(yuǎn)和積累性的影響。獸藥經(jīng)畜禽代謝后,通常以原藥的形式進(jìn)入環(huán)境中,引起土壤污染、水污染和植物蓄積,環(huán)境中的獸藥殘留再通過(guò)食物鏈進(jìn)入人體,影響人體健康[1]。當(dāng)人體中的獸藥殘留蓄積到一定量時(shí),會(huì)引起人體毒性反應(yīng),導(dǎo)致癌變、畸變、基因突變等不良后果[2]。因此,動(dòng)物源農(nóng)產(chǎn)品的獸藥殘留問(wèn)題已經(jīng)成為國(guó)際上公認(rèn)的農(nóng)業(yè)和環(huán)境問(wèn)題[3]。

        液相色譜(LC)-高分辨質(zhì)譜(HRMS)檢測(cè)技術(shù)是動(dòng)物源農(nóng)產(chǎn)品中獸藥殘留檢測(cè)分析的常規(guī)技術(shù)手段[4],LC能夠分離非揮發(fā)性化合物和大部分揮發(fā)性化合物[5],HRMS具有高精確度、高通量、全掃描等優(yōu)勢(shì),LC與HRMS聯(lián)用可全面獲取樣品中化合物[6]的精確分子質(zhì)量和碎片離子信息,區(qū)分同分異構(gòu)體和同重化合物,鑒定未知物[7]。

        在LC-HRMS檢測(cè)動(dòng)物源農(nóng)產(chǎn)品中獸藥殘留的研究中,首先通過(guò)樣品前處理來(lái)提取和凈化樣品中的獸藥化合物,前處理方法的選擇直接影響檢測(cè)結(jié)果。經(jīng)前處理后的樣品,通過(guò)液相色譜進(jìn)行分離,以降低基質(zhì)的復(fù)雜程度,獲得高質(zhì)量的質(zhì)譜數(shù)據(jù)[8-9]。然后再用HRMS進(jìn)行檢測(cè)分析,常用HRMS有飛行時(shí)間(TOF)質(zhì)譜、四級(jí)桿飛行時(shí)間(QTOF)質(zhì)譜、軌道阱質(zhì)譜(Orbitrap)、線性離子阱-軌道阱質(zhì)譜(LTQ-Orbitrap)、四級(jí)桿-軌道阱質(zhì)譜(Q-Orbitrap)等[10-13],隨著HRMS分辨率和靈敏度的不斷提高[14-17]和質(zhì)譜采集數(shù)據(jù)量的增大,需不斷開(kāi)發(fā)和優(yōu)化相應(yīng)軟件來(lái)處理數(shù)據(jù)。

        本文概述了2014—2018年LC-HRMS在動(dòng)物源農(nóng)產(chǎn)品的檢測(cè)研究中,涉及樣品前處理、液相分離、質(zhì)譜檢測(cè)、數(shù)據(jù)處理等方面的研究現(xiàn)狀,并對(duì)該技術(shù)未來(lái)的發(fā)展趨勢(shì)進(jìn)行展望,旨在為此類(lèi)研究提供參考。

        1 樣品前處理

        提取和凈化是LC-HRMS檢測(cè)動(dòng)物源農(nóng)產(chǎn)品中獸藥殘留的主要步驟,溶劑提取法和QuEChERS(quick,easy,cheap,effective,rugged,safe)方法是獸藥殘留常用的提取方法[18-26]。提取后得到的樣品中可能存在共提物,會(huì)增加檢測(cè)噪聲,因此須進(jìn)一步凈化處理將其去除,以降低檢測(cè)的檢測(cè)限和定量限。

        當(dāng)采用溶劑提取法提取動(dòng)物源農(nóng)產(chǎn)品中的獸藥殘留時(shí),單一溶劑提取可能無(wú)法取得滿意效果,此時(shí)可采用多種溶劑混合提取,如Chiesa等用有機(jī)溶劑提取魚(yú)中的21種抗生素時(shí)發(fā)現(xiàn),單獨(dú)使用濃度為70%的甲醇(含0.1%甲酸)提取,或者單獨(dú)使用乙腈(含0.1%甲酸)對(duì)樣品進(jìn)行提取,均不能使所有目標(biāo)化合物取得滿意的回收率,因此將試驗(yàn)分為2步,首先用酸化甲醇提取,再用酸化乙腈提取,最終獲得了滿意的回收率[27]。此外,可以在提取過(guò)程中應(yīng)用其他提取方法輔助提取來(lái)降低檢測(cè)限,如2015年,Cepurnieks等用5%三氯乙酸 (TCA)溶液提取牛奶中的26種抗生素[28],檢測(cè)濃度<100 ng/mL。2018年,Saluti等用0.25%TCA水溶液提取牛奶中14種抗生素時(shí),引入超聲來(lái)輔助提取,使檢測(cè)限≤33 μg/kg[29]。

        QuEChERS方法是一種通用的前處理方法[30],可同時(shí)提取樣品中的多種獸藥殘留。根據(jù)化合物的不同性質(zhì),可改變QuEChERS方法中溶劑、酸、鹽、吸附劑等的種類(lèi)和用量,提高獸藥殘留提取回收率[31],除方法的改進(jìn)外,QuEChERS方法提取自動(dòng)前處理平臺(tái)的應(yīng)用是此項(xiàng)術(shù)進(jìn)步的重要表現(xiàn),自動(dòng)化處理不僅減少了試劑對(duì)環(huán)境的污染,同時(shí)減少了人為因素對(duì)試驗(yàn)的影響,如Jia等應(yīng)用QuEChERS自動(dòng)前處理平臺(tái)提取了鱸魚(yú)中的24種大環(huán)內(nèi)酯類(lèi)藥物及其代謝產(chǎn)物[32-45]。

        凈化處理是提高獸藥檢測(cè)靈敏度的重要方法。常用的吸附劑有N-丙基乙二胺(PSA)、C18、氧化鋁和硅酸鎂等。近年來(lái),科研人員對(duì)吸附劑凈化效果的研究不斷細(xì)化,如Chen等用QuEChERS方法提取雞肉中的16種β-內(nèi)酰胺類(lèi)藥物,試驗(yàn)用QuEChERS凈化管(150 mg C18,300 mg PSA 和900 mg 無(wú)水硫酸鎂)凈化提取液,上機(jī)檢測(cè)的檢測(cè)限(LOD)為0.01~0.35 μg/kg,定量限(LOQ)為003~1.16 μg/kg[23],Lopez-Garcia等也采用QuEChERS方法來(lái)提取雞肉中的獸藥殘留[22],并評(píng)價(jià)了 PSA、硅酸鎂、C18鍵合鋯膠(Z-Sep+)、氧化鋁和C18等吸附劑的凈化效果,發(fā)現(xiàn)經(jīng)硅酸鎂和氧化鋁凈化后的檢測(cè)靈敏度最好,而其他的吸附劑對(duì)目標(biāo)化合物有吸附,導(dǎo)致靈敏度低。

        動(dòng)物源農(nóng)產(chǎn)品中獸藥殘留提取和凈化方法的選擇,要基于樣品基質(zhì)的理化性質(zhì)和研究目的,如果前處理方式不當(dāng),可能導(dǎo)致基質(zhì)干擾嚴(yán)重,有些重要的化合物未被提取,或在提取過(guò)程中丟失,進(jìn)而影響研究結(jié)果。

        2 色譜分離

        在LC-HRMS檢測(cè)動(dòng)物源農(nóng)產(chǎn)品的獸藥殘留研究中,LC分離能夠降低樣品的復(fù)雜程度,利于質(zhì)譜對(duì)樣品進(jìn)行準(zhǔn)確全面的檢測(cè)。與HRMS串聯(lián)使用的LC,已經(jīng)從高效液相色譜(HPLC)改進(jìn)為超高效液相色譜(UPLC),UPLC的分辨率、靈敏度和穩(wěn)定性都優(yōu)于HPLC。同時(shí),色譜柱的改良也有力地推動(dòng)了LC-HRMS在動(dòng)物源農(nóng)產(chǎn)品獸藥殘留檢測(cè)中的應(yīng)用。

        在獸藥殘留的液相色譜分析研究中,以硅膠為基質(zhì)的反相色譜柱在獸藥檢測(cè)中的應(yīng)用最為廣泛[46]。其中,反相C18色譜柱可保留非極性化合物,而苯基柱適合分析親水性化合物[47]。與反相色譜柱相比,親水相互作用色譜柱(HILIC)對(duì)極性強(qiáng)的獸藥化合物的保留效果更好[48-49]。而且色譜柱填料的改進(jìn)使色譜柱性能更加優(yōu)異,具體表現(xiàn)在填料顆粒的體積變小,超高效液相色譜柱的填料顆粒小于2 μm,因此分離效果更好,峰寬變窄[50],色譜的峰容量得到提高,分離效果得到改善,減少了質(zhì)譜中的離子抑制。液相色譜柱可承受的壓力增加,高達(dá) 1 500 bar[51],對(duì)樣品的洗脫速度加快,縮短了樣品的分析時(shí)間[52]。Zhao等在應(yīng)用LC-Q-Orbitrap測(cè)定斑石鯛中的80種獸藥殘留(獸殘)的研究中,對(duì)6種反相色譜柱分離樣品的效果進(jìn)行了比較,其中色譜柱直徑和填料孔徑尺寸最小的亞乙基雜化橋顆粒(BEH) C18色譜柱的分離能力、效率和靈敏度優(yōu)于其他5種色譜柱[36]。

        近年來(lái),微流液相色譜(μLC)、毛細(xì)管液相色譜(CLC)及納升液相色譜(nano LC)與HRMS的聯(lián)用提高了HRMS的檢測(cè)靈敏度[53-54],是未來(lái)LC-HRMS檢測(cè)發(fā)展的重要方向。Alcantara-Duran等應(yīng)用nano LC-HRMS定量檢測(cè)蜂蜜、牛奶、牛肉和雞蛋等樣品中的87種獸藥,將前處理后的樣品稀釋100倍,nano LC-HRMS仍能夠檢測(cè)到溶液中的目標(biāo)化合物[37],極大地提高了檢測(cè)靈敏度。Mirabelli等用nano LC-HRMS檢測(cè)殺蟲(chóng)劑的檢測(cè)限可達(dá)到10 pg/mL[55]。

        3 質(zhì)譜檢測(cè)

        電噴霧電離(ESI)源是液相色譜-質(zhì)譜(LC-MS)應(yīng)用中最常用的接口之一。ESI電離是一種軟電離方式,電離效率高。Araceli等采用ESI、大氣壓化學(xué)電離(APCI)和大氣壓光電離(APPI)3種電離方式對(duì)5種化合物的電離效果進(jìn)行比較研究,結(jié)果表明,化合物經(jīng)ESI電離后,產(chǎn)生的峰面積和信噪比明顯高于APCI和APPI[56]。在LC-MS的應(yīng)用研究中,超過(guò)80%的研究選用了ESI離子源,而APCI和APPI電離方式報(bào)道較少[57]。

        樣品經(jīng)離子源電離后,進(jìn)入質(zhì)譜檢測(cè)。HRMS具有高分辨率,能提供高精確度的全掃描數(shù)據(jù),有良好的定性能力[11,58-60]。特別是當(dāng)檢測(cè)的同分異構(gòu)體或同重化合物的保留時(shí)間和精確質(zhì)量數(shù)相同而無(wú)法區(qū)分時(shí),可以通過(guò)碎片離子信息的差異作進(jìn)一步的區(qū)分。因此,碎片離子信息采集的是否全面,是評(píng)價(jià)高分辨質(zhì)譜性能的重要評(píng)價(jià)指標(biāo)。目前,常用的HRMS數(shù)據(jù)采集模式主要分為數(shù)據(jù)依賴型采集(DDA)和數(shù)據(jù)非依賴型采集(DIA)。DDA采集時(shí),質(zhì)譜自動(dòng)從全掃描一級(jí)質(zhì)譜(FS MS)轉(zhuǎn)換成全掃描二級(jí)質(zhì)譜(FS MS/MS),后者是在前者的基礎(chǔ)上開(kāi)發(fā)出來(lái)的,包括離子碎片采集(AIF)和MSE采集模式等,能夠獲得所檢測(cè)質(zhì)量范圍內(nèi)所有的母離子和碎片離子信息。此外,離子淌度技術(shù)也是HRMS分離同分異構(gòu)體和同重化合物的重要技術(shù),該技術(shù)在電場(chǎng)中根據(jù)離子的大小、結(jié)構(gòu)和電荷對(duì)其進(jìn)行分離[61-62]。

        HRMS的分辨率隨硬件的發(fā)展不斷提高。如Qtof是四級(jí)桿與飛行時(shí)間質(zhì)譜串聯(lián)的儀器,它在實(shí)際檢測(cè)中的分辨率<30 000,主要用來(lái)做定性試驗(yàn),可提供一級(jí)和二級(jí)質(zhì)譜數(shù)據(jù)作為定性判斷依據(jù),Nacher-Mestre等用UPLC- Xevo G2 Qtof定性篩查了動(dòng)物加工副產(chǎn)品中的150種獸藥,當(dāng)基質(zhì)加標(biāo)量為0.2 mg/kg時(shí)可檢測(cè)出75%獸藥,當(dāng)基質(zhì)加標(biāo)量為0.1 mg/kg 時(shí)可檢測(cè)出65%的獸藥,當(dāng)加標(biāo)量為0.02 mg/kg時(shí)可檢測(cè)出30%的獸藥[42]。而 LTQ-Orbitrap 的分辨率高于Qtof,分辨率設(shè)置范圍為7 500~100 000,可以提供多級(jí)質(zhì)譜數(shù)據(jù)作定性定量研究。Saito-Shida等對(duì)146種化合物進(jìn)行定量測(cè)定時(shí),比較了應(yīng)用LC-Orbitrap-MS建立的方法和應(yīng)用LC-QTOF-MS建立方法的線性、回收率、精密度和基質(zhì)效應(yīng),結(jié)果表明Orbitrap-MS的選擇性和靈敏度優(yōu)于QTOF-MS[63],而且LTQ-Orbitrap的多級(jí)質(zhì)譜(MSn)數(shù)據(jù)采集模式可以為獸藥及其代謝物的鑒定提供更豐富的碎片離子信息。比LTQ-Orbitrap性能更好的Q-Orbitrap分辨率可以達(dá)到140 000,Jia等應(yīng)用UHPLC-Q-Orbitrap對(duì)鱸魚(yú)中的24種大環(huán)內(nèi)酯類(lèi)藥物及其代謝產(chǎn)物做定性定量檢測(cè),其中確定限(CCα)為 0.12~3.61 μg/kg,檢測(cè)容量(CCβ)為0.20~6.02 μg/kg[32],具體檢測(cè)結(jié)果見(jiàn)表1。

        HRMS最初主要被應(yīng)用于定性篩查研究中,目前隨著HRMS硬件的不斷進(jìn)步,HRMS的分辨率和靈敏度得到提高,使基質(zhì)干擾問(wèn)題得以解決[5,64],HRMS在全掃描模式下的選擇性與三重四級(jí)桿在選擇反應(yīng)監(jiān)測(cè)(selected reaction monitoring,SRM)模式下的選擇性一樣好,因此被越來(lái)越多地應(yīng)用于獸藥定量研究中。4 數(shù)據(jù)分析

        在LC-HRMS檢測(cè)動(dòng)物源農(nóng)產(chǎn)品獸藥殘留的研究中,根據(jù)研究目的不同,可分為靶向檢測(cè)數(shù)據(jù)處理和非靶向檢測(cè)數(shù)據(jù)處理。在靶向檢測(cè)研究中,數(shù)據(jù)處理步驟包括原始數(shù)據(jù)采集、生成參考數(shù)據(jù)庫(kù)(自建數(shù)據(jù)庫(kù)或在線數(shù)據(jù)庫(kù))、化合物的分離鑒定、數(shù)據(jù)的標(biāo)準(zhǔn)化和量化、數(shù)據(jù)分析步驟一體化(自動(dòng)處理工具)。其中,數(shù)據(jù)的采集主要采用儀器供應(yīng)商提供的軟件[39-41,44],如Thermo Fisher Scientific公司的Xcalibur軟件、Waters公司的MassLynx軟件、AB公司的Multiquant軟件、Agilent公司的Mass Hunter等,常用的數(shù)據(jù)處理軟件見(jiàn)表2。數(shù)據(jù)分析所用數(shù)據(jù)庫(kù)主要有2類(lèi),一類(lèi)是由科研人員自己建立的數(shù)據(jù)庫(kù),另一類(lèi)是在線數(shù)據(jù)庫(kù),如Chemspider、Metlin、Drug Bank等。通過(guò)搜索化合物的精確質(zhì)量數(shù),可以得到與之對(duì)應(yīng)的化合物,但是存在以下問(wèn)題:數(shù)據(jù)庫(kù)中所含化合物不夠全面;對(duì)給定的精確質(zhì)量數(shù)不能提供準(zhǔn)確的分子結(jié)構(gòu);或?qū)ν痪_質(zhì)量數(shù)給出多個(gè)化合物。因此,須根據(jù)元素組成,對(duì)化合物分子式進(jìn)行推斷,并結(jié)合特征碎片離子信息鑒定化合物,最后通過(guò)檢測(cè)標(biāo)準(zhǔn)品來(lái)確證。在使用數(shù)據(jù)處理軟件時(shí),參數(shù)設(shè)置會(huì)影響研究結(jié)果,例如,若質(zhì)量提取窗口設(shè)置范圍過(guò)寬,可能有假陽(yáng)性檢出。為避免假陽(yáng)性或假陰性,須要對(duì)質(zhì)量提取窗口的寬度范圍進(jìn)行試驗(yàn),如Jia等試驗(yàn)了質(zhì)量提取窗口設(shè)置成1~10 μg/kg時(shí),數(shù)據(jù)處理軟件對(duì)羅非魚(yú)中獸藥及其代謝物的選擇性,發(fā)現(xiàn)當(dāng)質(zhì)量提取窗口為3 μg/kg時(shí),目標(biāo)分析物的提取效果最好[39]。

        在動(dòng)物源農(nóng)產(chǎn)品的非靶向檢測(cè)研究中,數(shù)據(jù)分析步驟為原始數(shù)據(jù)采集、數(shù)據(jù)保存和轉(zhuǎn)化、數(shù)據(jù)導(dǎo)入、數(shù)據(jù)壓縮和矩陣建立、數(shù)據(jù)歸一化、特征檢測(cè)、生物標(biāo)志物篩查、鑒定。多元統(tǒng)計(jì)分析方法如主成分分析(PCA)和正交偏最小二乘判別分析(OPLS-DA)等可識(shí)別動(dòng)物源樣品中的獸藥及其代謝產(chǎn)物,通用的商業(yè)軟件可能無(wú)法直接處理LC-HRMS檢測(cè)的原始數(shù)據(jù),因此須要對(duì)原始數(shù)據(jù)進(jìn)行格式轉(zhuǎn)換,轉(zhuǎn)換成開(kāi)放性的數(shù)據(jù)格式之后便可進(jìn)行數(shù)據(jù)處理[65-66]。近年來(lái),隨著數(shù)據(jù)處理軟件的升級(jí),自動(dòng)化處理的程度越來(lái)越高。如Morales-Gutierrez等應(yīng)用UPLC-LTQ-Qrbitrap MS檢測(cè)雞的肉、肝、腎中的阿莫西林及其代謝產(chǎn)物時(shí),用PCA方法對(duì)數(shù)據(jù)進(jìn)行處理,獲得了區(qū)分用藥組和非用藥組的化合物,試驗(yàn)測(cè)得的原始數(shù)據(jù)首先經(jīng)Xcalibur軟件轉(zhuǎn)化成mzXML文件,再用MzMine軟件和XCMS軟件來(lái)處理此數(shù)據(jù),得到可以用Matlab處理的數(shù)據(jù)矩陣,最后用PCA法處理的數(shù)據(jù)矩陣,得到組間差異化合物[35]。而在Arias等用OPLS-DA模型識(shí)別用藥豬與未用藥豬之間差異的研究[67]中,數(shù)據(jù)前處理僅使用了TransOmics軟件[沃特世科技(上海)有限公司],經(jīng)歸一化、標(biāo)準(zhǔn)化的數(shù)據(jù)直接導(dǎo)入SIMCA軟件(德國(guó)賽多利斯集團(tuán))進(jìn)行多元統(tǒng)計(jì)分析。自動(dòng)處理軟件的開(kāi)發(fā),簡(jiǎn)化了處理過(guò)程,縮短了處理時(shí)間。

        5 展望

        動(dòng)物源農(nóng)產(chǎn)品中的獸藥殘留直接危害公眾健康,因此受到消費(fèi)者和監(jiān)管部門(mén)的重視。高效準(zhǔn)確地檢測(cè)動(dòng)物源農(nóng)產(chǎn)品中的獸藥殘留情況,對(duì)保證動(dòng)物源農(nóng)產(chǎn)品的質(zhì)量安全具有重要意義?;贚C-HRMS的獸藥殘留檢測(cè)方法已經(jīng)發(fā)展成為一項(xiàng)非常重要的檢測(cè)手段,綠色、高效的提取方法是未來(lái) LC-HRMS 前處理方法的發(fā)展方向,色譜系統(tǒng)和色譜柱填料的進(jìn)步,特別是將新型的色譜分離技術(shù)如nanoLC、μLC和CLC等與HRMS相結(jié)合是減少基質(zhì)效應(yīng)、提高分離效率的發(fā)展方向,HRMS分辨率的不斷提高以及應(yīng)用軟件的優(yōu)化會(huì)進(jìn)一步促進(jìn)LC-HRMS技術(shù)在動(dòng)物源農(nóng)產(chǎn)品獸藥殘留檢測(cè)中的應(yīng)用研究。

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