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      QuEChERS方法在食品中多組分農(nóng)殘檢測(cè)中的研究進(jìn)展

      2016-02-05 15:37:15任水英
      中國(guó)釀造 2016年9期
      關(guān)鍵詞:極性吸附劑乙腈

      鹿 劍,任水英

      (1.新疆特種設(shè)備檢驗(yàn)研究院,新疆 烏魯木齊 830011;2.國(guó)家農(nóng)副產(chǎn)品監(jiān)督檢驗(yàn)中心(新疆),新疆 烏魯木齊 830011;3.新疆大學(xué) 石油天然氣精細(xì)化工教育部和自治區(qū)重點(diǎn)實(shí)驗(yàn)室,新疆 烏魯木齊 830046)

      QuEChERS方法在食品中多組分農(nóng)殘檢測(cè)中的研究進(jìn)展

      鹿劍1,任水英2,3

      (1.新疆特種設(shè)備檢驗(yàn)研究院,新疆 烏魯木齊 830011;2.國(guó)家農(nóng)副產(chǎn)品監(jiān)督檢驗(yàn)中心(新疆),新疆 烏魯木齊 830011;3.新疆大學(xué) 石油天然氣精細(xì)化工教育部和自治區(qū)重點(diǎn)實(shí)驗(yàn)室,新疆 烏魯木齊 830046)

      QuEChERS技術(shù)自推出以來(lái),因快速、簡(jiǎn)單、便宜、有效、可靠和安全等特點(diǎn)在農(nóng)殘分析中得以迅速發(fā)展和廣泛應(yīng)用。本文針對(duì)QuEChERS法在不同基質(zhì)農(nóng)殘分析中的改進(jìn),就其在農(nóng)殘檢測(cè)中的應(yīng)用進(jìn)行了綜述,并對(duì)QuEChERS法在今后的應(yīng)用前景以及發(fā)展方向進(jìn)行了展望。

      QuEChERS;樣品前處理;農(nóng)藥殘留;研究進(jìn)展

      農(nóng)殘分析中,由于樣品基質(zhì)復(fù)雜、待測(cè)組分含量極微,前處理方法在檢測(cè)過(guò)程中起著至關(guān)重要的作用。針對(duì)復(fù)雜樣品體系,常用的樣品前處理技術(shù)有固相萃取法[1-2]、固相微萃取法[3]、分散固相萃取法[4]、基質(zhì)分散固相萃取法(matrix solid-phase dispersion,MSPD)[5]、攪拌棒吸附萃?。?]、分散液液微萃?。?]、凝膠滲透色譜[8]、QuEChERS(Quickly,Easy,Cheap,Effective,Rugged,Safe)技術(shù)[9]等,其中QuECh-ERS技術(shù)因快速、簡(jiǎn)單、便宜、有效、可靠和安全等特點(diǎn)在農(nóng)殘分析中引起了廣泛關(guān)注并得以迅速發(fā)展。本文主要針對(duì)QuEChERS法在不同基質(zhì)中農(nóng)殘分析的改進(jìn),綜述了近年來(lái)QuEChERS法在多組分農(nóng)殘檢測(cè)方面的應(yīng)用研究進(jìn)展。

      QuEChERS法于2002年由美國(guó)農(nóng)業(yè)部東部地區(qū)研究中心的學(xué)者在第四屆歐洲農(nóng)藥殘留工作組會(huì)議上首次提出,是在固相萃取技術(shù)和MSPD技術(shù)基礎(chǔ)上發(fā)展起來(lái)的一種針對(duì)水果和蔬菜中農(nóng)藥殘留檢測(cè)的樣品前處理方法[10]。其過(guò)程可歸納為三步:(1)提?。河蒙倭恳译嫒軇⒎治鑫飶膭驖{樣品中提取出來(lái);(2)分離:加入鹽析鹽無(wú)水硫酸鎂和氯化鈉(或乙酸鈉),促使液液分離;(3)凈化:依據(jù)分散固相萃取原理,向乙腈層中加入凈化粉,除去提取液中的共萃雜質(zhì),以減少基質(zhì)效應(yīng)。

      QuEChERS方法適用范圍廣,可同時(shí)提取結(jié)構(gòu)相差很大的非極性、中等極性、極性物質(zhì),包括農(nóng)藥[11-12]、獸藥[13]、生物毒素[14]等。除了用于檢測(cè)水果、蔬菜和農(nóng)作物外,QuECh-ERS法還被用于蜂蜜[15]、牛奶、果汁中的農(nóng)藥殘留檢測(cè)。

      1 QuEChERS的改進(jìn)

      QuEChERS靈活性強(qiáng),已經(jīng)成為世界各國(guó)殘留分析技術(shù)的模板。根據(jù)目標(biāo)化合物性質(zhì)、樣品基質(zhì)、設(shè)備、分析技術(shù)的不同,研究者對(duì)QuEChERS法進(jìn)行了改進(jìn),主要包括:(1)提取溶劑的改進(jìn);(2)分散固相萃取中吸附劑的選擇;(3)輔助提取方式的引入。根據(jù)這些改進(jìn),QuEChERS法被發(fā)展出不同的版本,其中兩個(gè)版本被定義為官方方法:(1)LEHOTAY S J等[16]采用含0.1%乙酸的乙腈為提取劑,以無(wú)水乙酸鈉代替氯化鈉作為鹽析劑,借助乙酸-乙酸鈉緩沖溶液(pH=4.8)來(lái)調(diào)節(jié)水相及有機(jī)相的酸度,提高了對(duì)酸性或堿性基質(zhì)較敏感的農(nóng)藥的回收率,該方法被定義為AOAC法2007.01;(2)有學(xué)者[17]以乙腈為萃取劑,采用酸性較弱的檸檬酸鈉-檸檬酸二鈉緩沖溶液來(lái)調(diào)節(jié)提取過(guò)程中溶液的pH(5.0~5.5),經(jīng)無(wú)水硫酸鎂和氯化鈉鹽析離心分層,該方法被定義為EN 15662法。

      1.1提取溶劑的選擇

      檢測(cè)食品基質(zhì)中多組分農(nóng)藥殘留時(shí),提取劑的選擇非常關(guān)鍵。QuEChERS方法常用的提取溶劑包括乙腈、甲醇、乙酸乙酯、酸化甲醇、酸化乙腈。

      ZHANG W等[18]以價(jià)格低廉、毒性較小的乙酸乙酯和環(huán)己烷(V/V=1∶1)為提取劑,以乙二胺N-丙基硅烷(primary secondary amine,PSA)凈化粉和石墨化炭黑(graphitiacxi carhon black,GCB)為吸附劑,氣相色譜-串聯(lián)質(zhì)譜法分析檢測(cè)了黃瓜、蘋(píng)果、番茄、葡萄等水果蔬菜中的啶氧菌酯、醚菌酯和肟菌酯等三種殺菌劑,并被用于土壤基質(zhì)的檢測(cè)中。UGARE B等[19]采用含體積分?jǐn)?shù)1%甲酸的甲醇提取,建立了同時(shí)檢測(cè)葡萄中的氯吡脲等4種植物生長(zhǎng)調(diào)節(jié)劑高效液相色譜-串聯(lián)質(zhì)譜方法。FLORES M I等[20]以含體積分?jǐn)?shù)1%乙酸的乙腈為提取劑,以超高效液相色譜-串聯(lián)質(zhì)譜(ultra performance liquid chromatography-tandern mass spectrometry,UPLC-MS/MS)法同時(shí)分析檢測(cè)蔬菜中的萘乙酸等6種植物生長(zhǎng)調(diào)節(jié)劑。GOLGE O等[21]以含體積分?jǐn)?shù)1%乙酸的乙腈為提取劑,采用液相色譜-質(zhì)譜聯(lián)用法分析檢測(cè)了番茄中2,4-氯苯乙酸(2,4-D)等109種農(nóng)藥。LEHOTAY S J等[22]采用含1%乙酸的乙腈為提取劑,分析檢測(cè)了蔬菜、水果中200多種農(nóng)藥,提高了酸性物質(zhì)及易受基質(zhì)干擾物質(zhì)的回收率。LACINA O等[23]采用甲酸化乙腈為提取劑,建立了同時(shí)測(cè)定了果蔬中棒曲霉毒素等38種毒素和萘氧乙酸等288種農(nóng)藥的HPLC-MS/MS檢測(cè)方法,提高了極性較強(qiáng)的酸性物質(zhì)的回收率。

      MOL H G J等[24]比較了三種提取劑:水-有機(jī)溶劑(乙腈、甲醇、丙酮,均含1%甲酸),從飼料及基質(zhì)中同時(shí)提取農(nóng)藥、獸藥、毒素、植物生長(zhǎng)調(diào)節(jié)劑等172種化合物,結(jié)果表明,選擇水-乙腈(1%甲酸)為提取劑時(shí),回收率高,基質(zhì)效應(yīng)較低,可作為日常檢測(cè)方法使用,省時(shí)省力;LEHOTAY S J等[25]比較了同時(shí)測(cè)定果蔬中多種種類農(nóng)藥的QuEChERS方法的三個(gè)版本,并試圖用乙酸乙酯代替乙腈作為提取劑。結(jié)果表明,首創(chuàng)版本對(duì)受pH影響較大的物質(zhì)回收率較低;采用乙酸乙酯作為提取劑時(shí),提取的雜質(zhì)較多,且吡蚜酮等多種物質(zhì)回收率較低。CAMINO-SáNCHEZ F J等[26]參照CEN版本,調(diào)整了樣品與溶劑的比例,在采用氣相色譜-串聯(lián)質(zhì)譜法同時(shí)檢測(cè)果蔬中121種農(nóng)藥時(shí),得到了更高的靈敏度,方法完全滿足歐盟關(guān)于農(nóng)藥殘留檢測(cè)的要求。COSTA F P等[27]比較了QuEChERS法三個(gè)版本在提取桃罐頭食品中10種農(nóng)藥時(shí)的效率,結(jié)果表明,三個(gè)版本在回收率方面無(wú)顯著的區(qū)別,這可能因?yàn)閷?duì)于成熟的桃子,有機(jī)酸含量降低,糖含量增加,即便未使用緩沖溶液,提取液的pH范圍也在4~5之間,與使用緩沖溶液的方法(pH4.8~5.5)相差不大;該方法用基質(zhì)標(biāo)液和內(nèi)標(biāo)法解決了基質(zhì)效應(yīng)較大的問(wèn)題。

      乙腈是最常用的提取溶劑,對(duì)農(nóng)藥的極性要求不高,可在較寬泛的pH范圍內(nèi)獲得較高的回收率,且溶解的非極性物質(zhì)如脂肪及極性較大化合物如蛋白質(zhì)、鹽類、糖較少[28];同時(shí),通過(guò)鹽析作用,乙腈易與水層分離。實(shí)驗(yàn)中,為了延長(zhǎng)不穩(wěn)定化合物的穩(wěn)定性,提高酸性物質(zhì)及易受基質(zhì)干擾物質(zhì)的回收率,常用乙酸或甲酸將乙腈酸化。酸性萃取劑使目標(biāo)化合物呈分子狀態(tài),避免了酸性化合物的水解,提高了酸性化合物及易受基質(zhì)干擾物質(zhì)的回收率。采用酸化乙腈作為提取溶劑拓展了QuEChERS技術(shù)的使用范圍。

      1.2分散固相萃取中吸附劑的選擇

      對(duì)于基質(zhì)較復(fù)雜的樣品檢測(cè),凈化步驟非常重要。干擾物質(zhì)的去除有利于降低檢出限,增加結(jié)果準(zhǔn)確率。凈化效果主要決定于吸附劑的選擇。根據(jù)待測(cè)組分以及樣品中干擾基質(zhì)的不同,研究者需選擇不同的吸附劑。MANTZOS N等[29]以PSA為吸附劑,建立了土壤、向日葵、油菜中吡草胺、乙氧氟草醚、精喹禾靈、喹草酸、氯氰菊酯等的分析方法。WANG P等[30]以GCB為分散固相萃取吸附劑,分析檢測(cè)橘子、綠茶等植物源性食品中的除草劑,當(dāng)樣品為杏仁和花生油時(shí),吸附劑替換為弗洛里硅土。KOESUKWIWAT U等[31]以C18和中性鋁為吸附劑,采用超高效液相色譜-電噴霧二級(jí)質(zhì)譜聯(lián)用技術(shù)法分析檢測(cè)了大米中的13種苯氧基酸類除草劑。ZHAO H等[32]以弗洛里硅土、石墨化炭黑為吸附劑,以QuEChERS-液相色譜串聯(lián)質(zhì)譜法分析檢測(cè)了水果蔬菜中的酞酰替苯胺酸,此方法可用于日常的檢測(cè)中。KOESULWIWAT U等[33]采用MgSO4、PSA和C18為吸附劑,成功地從富含脂肪的谷物、亞麻籽、花生和面團(tuán)中提取了莠去津等34種常用農(nóng)藥,凈化效果優(yōu)于凝膠滲透色譜及冷凍實(shí)驗(yàn)。ARIAS J L等[34]在用QuEChERS-液相色譜串聯(lián)質(zhì)譜法檢測(cè)水稻土樣中的16種農(nóng)藥時(shí),比較了甲殼素,殼聚糖,硅藻土和PSA等吸附劑的提取效率和基體效應(yīng),結(jié)果表明,殼聚糖最好。BEYER A等[35]比較了不同吸附劑在檢測(cè)低脂食品中多氯聯(lián)苯和農(nóng)藥時(shí)的凈化效果,結(jié)果表明,弗羅里硅土、氧化鋁和NH2柱凈化效果好,去除干擾物質(zhì)的量最大,可保證大多數(shù)化合物的回收率高于70%;而非多孔石墨化炭黑和C18柱并沒(méi)有消除基體干擾。

      除了選擇現(xiàn)有的吸附劑,自制選擇性吸附劑也成為研究者的研究方向。WANG F等[36]以自制的四環(huán)素-芳烴-三嗪修飾的環(huán)芳烴超大分子為吸附劑,采用液相色譜技術(shù),分析了水果中氯吡脲六種植物生長(zhǎng)調(diào)節(jié)劑。ZHAO P等[37]以自制的多壁碳納米管凈化劑,分析檢測(cè)了番茄及番茄制品中的乙草胺等186種殘留農(nóng)藥。WANG Z H等[38]以自制備的多壁碳納米管為固相萃取吸附劑,分析檢測(cè)了植物樣品中的萘乙酸、吲哚丁酸,結(jié)果表明,用該物質(zhì)做吸附劑比C18效果好。

      綜上,PSA、C18、GCB在農(nóng)藥殘留檢測(cè)前處理方法中是效果較好的凈化吸附劑。PSA兼具極性相互作用和較弱的陰離子交換作用,可有效從非極性樣品中除去極性物質(zhì)如色素、糖、有機(jī)酸等。C18產(chǎn)生強(qiáng)非極性相互作用,主要用來(lái)從極性樣品中提取非極性、中等極性化合物,如脂肪酸、烯烴類、色素等大分子干擾物質(zhì)。GCB主要用來(lái)除去疏水性物質(zhì)如葉綠素、類胡蘿卜素等[39]。實(shí)際分析中,可根據(jù)目標(biāo)化合物及樣品基質(zhì)的不同進(jìn)行選擇或者配合使用。

      另外,在以下兩種情況下,可省去凈化過(guò)程:一是采用消耗溶劑少、富集倍數(shù)及提取效率高的液相微萃取技術(shù)處理樣品時(shí),與QuEChERS技術(shù)相結(jié)合,可省去凈化過(guò)程;二是樣品本身干擾相對(duì)較少,且采用準(zhǔn)確度和精密度較高的色譜-串聯(lián)質(zhì)譜作為分析平臺(tái)時(shí),可省去凈化過(guò)程。

      1.3輔助提取方式的引入

      MAO X等[40]在微波輔助模式下,以乙酸乙酯為提取劑,濃縮近干后以乙腈復(fù)溶,再采用MgSO4和PSA凈化粉凈化,用液相色譜串聯(lián)質(zhì)譜技術(shù)分析了梨中的吲哚乙酸等6種植物生長(zhǎng)調(diào)節(jié)劑,微波輔助提取技術(shù)第一次被應(yīng)用在果蔬中植物生長(zhǎng)調(diào)節(jié)劑的檢測(cè)。PORORTO-FIGUEIRAP等[41]采用超聲輔助QuEChERS前處理方法,采用超高效液相色譜-熒光檢測(cè)器分析檢測(cè)了谷物中典型的玉米赤霉烯酮,與傳統(tǒng)的QuEChERS法相比,該方法沉析鹽用量少、樣品量少、提取溶劑少。ZHANG F等[42]在超聲輔助條件下,以乙腈水為提取劑,以修正的QuChERS法處理樣品,分析檢測(cè)了豆芽中的6-芐氨基嘌呤等4種植物生長(zhǎng)調(diào)節(jié)劑。CHO S K等[43]采用低溫冷凍(-80℃)的方式使乙腈相、水相分離,以HPLC-MS/MS技術(shù)同時(shí)檢測(cè)了豆芽中的多菌靈、噻菌靈、6-BA等化合物。MORENO C M等[44]將大蒜樣品用液氮冷凍,研磨成粉,再用甲醇在低溫(22~25℃)條件下提取,然后將提取液在-20℃的冰箱內(nèi)放置3 h,分析檢測(cè)了樣品中的青鮮素。ESPARZA X等[45]將蘋(píng)果樣品冷凍貯存,以乙酸乙酯在超聲浴條件下提出,濃縮復(fù)溶,檢測(cè)了蘋(píng)果樣品中的α-萘乙酸、α-萘氧乙酸、β-萘乙酸、β-萘氧乙酸、萘乙酰胺等萘乙酸類植物生長(zhǎng)調(diào)節(jié)劑。

      輔助方法包括微波輔助提取、超聲波輔助提取的引入,可提高目標(biāo)化合物的提取效率;而對(duì)樣品的冷凍處理減少了提取液中的基質(zhì),為后續(xù)的凈化處理及分析檢測(cè)提供了方便。

      2 QuEChERS方法的優(yōu)勢(shì)

      與傳統(tǒng)方法相比,QuEChERS方法彰顯出明顯的優(yōu)勢(shì)[46-48]:(1)檢測(cè)對(duì)象范圍廣,可同時(shí)檢測(cè)極性、中等極性及非極性物質(zhì);(2)基質(zhì)適用范圍廣,不但適用于水果、蔬菜,也被應(yīng)用于蜂蜜、牛奶、果汁等樣本的農(nóng)藥殘留檢測(cè);(3)凈化過(guò)程可使用不同種類吸附劑,減少基質(zhì)效應(yīng);(4)凈化過(guò)程中有機(jī)酸可被除去,對(duì)精密儀器影響較?。唬?)回收率高,對(duì)大量極性和揮發(fā)性農(nóng)藥都有較高的回收率;(6)穩(wěn)定性好,精密度可滿足歐洲法典對(duì)食品和飼料中農(nóng)藥殘留分析方法控制及驗(yàn)證程序的控制[49]。(7)省時(shí)省力,處理速度塊,每30~40min可完成10~20個(gè)預(yù)先稱重樣品的處理;(8)提取過(guò)程消耗溶劑少,分析成本低;使用溶劑毒性小,廢液少,減少環(huán)境污染;(9)樣品處理過(guò)程無(wú)需特殊裝置,可廣泛用于小型實(shí)驗(yàn)室甚至可移動(dòng)的實(shí)驗(yàn)室;(10)操作簡(jiǎn)便、步驟少,無(wú)需較多的培訓(xùn)和較高的技能。

      3 展望

      QuEChERS方法作為一種新型的廣譜多殘留提取凈化技術(shù),自問(wèn)世以來(lái)得到迅速發(fā)展和廣泛應(yīng)用。與常規(guī)樣品前處理技術(shù)相比,QuEChERS方法較大程度地解決了傳統(tǒng)方法所需時(shí)間長(zhǎng)、有毒溶劑使用量大、共存物易干擾定性和定量等問(wèn)題,尤其在多殘留檢測(cè)方面優(yōu)勢(shì)明顯。其提取凈化介質(zhì)已經(jīng)滲透到各個(gè)領(lǐng)域,涉及水果、蔬菜、谷物、各類深加工食品以及土壤、水等。

      QuEChERS靈活性強(qiáng),已經(jīng)成為世界各國(guó)殘留分析技術(shù)的模板。由于一個(gè)分析方法可能不適用于不同的基質(zhì),實(shí)驗(yàn)人員可以根據(jù)分析物、基質(zhì)成分不同,通過(guò)改變提取溶劑、調(diào)整不同吸附劑及其用量等手段靈活改進(jìn)優(yōu)化方法,達(dá)到實(shí)驗(yàn)?zāi)康?。另外,QuEChERS和氣相色譜串聯(lián)質(zhì)譜、液相色譜串聯(lián)質(zhì)譜聯(lián)用法發(fā)展迅速,在環(huán)境樣品及生物樣品的前處理領(lǐng)域會(huì)有廣闊的發(fā)展空間。

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      [49]Document No SANTE/11945/2015 European Union.2015.Guidence document on analytical quality control and method validation procedures for pesticides residues analysis in food and feed.Accessed 01. 11.16.

      Research progress of QuEChERS method in multi-pesticides residue analysis in food

      LU Jian1,REN Shuiying2,3
      (1.Xinjiang Uygur Autonomous Region Inspection Institute of Special Equipment,Urumqi 830011,China;2.National Quality Supervision Test Center of Agricultural Byproducts(Xinjiang),Urumqi 830011,China;3.Ministry Key Laboratory of Oil and Gas Fine Chemicals,College of Chemistry and Chemical Engineering,Xinjiang University,Urumqi 830046,China)

      As a quick,easy,cheap,effective,reliable and safe sample preparation method,QuEChERS method has developed rapidly and used widely in pesticide residue analysis since its inception.The article focused on the improvement of QuEChERS method in the analysis of pesticide residues in different matrix,and summarized its application in multi-residue determination of pesticides and forecasted the bright prospect of QuEChERS method.

      QuEChERS;sample preparation;pesticide residues;research progress

      O656

      0254-5071(2016)09-0028-05doi:10.11882/j.issn.0254-5071.2016.09.007

      2016-06-08

      鹿劍(1975-),男,高級(jí)工程師,本科,主要從事特種設(shè)備檢驗(yàn)工作。

      任水英(1981-),女,高級(jí)工程師,博士研究生,主要從事食品檢測(cè)及相關(guān)科研工作。

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