張建平 黃朝章 余志強(qiáng) 謝衛(wèi) 劉澤春 許寒春 藍(lán)洪橋 鄧其馨 黃延俊
摘 ?要:為降低煙草中噁霉靈檢測中的基質(zhì)干擾,提高檢測靈敏度和和穩(wěn)定性,通過試驗建立了以QuEChERS為樣品前處理方法、液相色譜串聯(lián)質(zhì)譜儀為檢測儀器的煙草中噁霉靈殘留檢測方法。樣品加水浸潤后,經(jīng)丙酮提取、鹽析試劑包除水、石墨化炭黑除雜后,采用Agilent ZORBAX 300SB-C8液相色譜柱(2.1 mm×100 mm,1.8 μm)分離,甲醇-水程序洗脫,ESI霧化,串聯(lián)質(zhì)譜MRM檢測。結(jié)果發(fā)現(xiàn),該方法在0.0025~0.0500 mg/L范圍內(nèi)線性良好,決定系數(shù)r2=0.9996,定量檢測限1.06 μg/L,回收率在90.8%~92.0%之間,相對標(biāo)準(zhǔn)偏差為5.1%。運用該方法測定煙草中的噁霉靈,操作簡單,檢測精度高,滿足CORESTA對煙草農(nóng)殘檢測的要求。
關(guān)鍵詞:煙草;噁霉靈;超高效液相色譜串聯(lián)質(zhì)譜法
Abstract: In order to reduce matrix interference and improve detection sensitivity and stability, a method for determination of hymexazol residues in tobacco was established using QuEChERS as sample pretreatment method and liquid chromatography tandem mass spectrometer as detection instrument. The samples were extracted by acetone after moistened with water, then bytreated with salting-out reagent to remove water and purified by graphitized carbon black (GCB). After separated by Agilent ZORBAX 300SB- C8 column (2.1 mm×100 mm, 1.8 μm) with methanol-water as the mobile phase,the extracts were detected by an electrospray ionization (ESI) tandem mass spectrometry in the multiplereaction-monitoring (MRM) mode. The results showed that good linearity was obtained in the range of 0.0025-0.0500 mg/L, the linear correlation coefficient (r2) was 0.9996, the quantitative detection limit was 1.06 μg/L, the recovery ratio was between 90.8%-92.0%, and the relative stantdard deviation was 5.1%. With simple operation and high detection accuracy, this method is suitable for hymexazol determination in tobacco, which meets CORESTA's requirements for tobacco pesticide residue detection.
Keywords: tobacco; hymexazol; ultra performance liquid chromatography-tandem mass spectrometry
隨著消費者對健康問題的關(guān)注,農(nóng)藥殘留成為卷煙安全性的重點關(guān)注指標(biāo)之一。噁霉靈(3-羥基-5-甲基異惡唑)作為土壤殺菌劑,在煙草、水稻、黃瓜、西瓜、甜菜等作物中廣泛使用。噁霉靈毒性雖較低,但也存在農(nóng)藥殘留問題,《食品中農(nóng)藥最大殘留限量》國家標(biāo)準(zhǔn)明確要求噁霉靈在糙米和甜菜中的殘留量不得高于0.50 mg/kg[1-2];煙草行業(yè)標(biāo)準(zhǔn)《煙葉農(nóng)藥最大殘留限量》中規(guī)定噁霉靈在煙草中的最大殘留(MRL)值為0.50 mg/kg,然而配套的YC/T405系列檢測標(biāo)準(zhǔn)[3-7]中卻缺少了噁霉靈相關(guān)檢測方法。
目前報道的噁霉靈檢測主要有氣相色譜法[8-11]、電化學(xué)分析法[12-13]和液相色譜-紫外檢測法[14-16]。其中氣相色譜法因噁霉靈具有熱不穩(wěn)定性,需經(jīng)衍生化才能進(jìn)入氣相色譜儀分析,且操作復(fù)雜、檢測誤差大;采用電化學(xué)分析法測定噁霉靈時選擇性差,檢測靈敏度低,多用于工藝跟蹤和成品的定量分析;而液相色譜-紫外檢測法測定噁霉靈時雜質(zhì)干擾較大,不適用于煙草等復(fù)雜基質(zhì)樣品的檢測。
鑒于現(xiàn)有檢測手段的不足,本文嘗試對傳統(tǒng)液相色譜檢測方法進(jìn)行改進(jìn),建立一種以QuEChERS樣品前處理結(jié)合液相色譜串聯(lián)質(zhì)譜儀檢測為核心的煙草中噁霉靈殘留量檢測方法。
1 ?材料與方法
1.1 ?儀器和試劑
高效液相色譜儀(Agilent1290,美國Agilent公司);三重四級桿串接質(zhì)譜儀(API5500,美國AB SCIEX公司);超純水儀(Milli-Q,美國Millipore公司);漩渦混合振蕩儀(VX-200,美國Labnet公司);高速離心機(jī)(Sigma1-14,德國Sartorius公司);電子天平(AG104型,感量:0.0001 g,瑞士Mettler Toledo公司)。
標(biāo)準(zhǔn)品:噁霉靈(Hymexazol),純度>99.5%,國家標(biāo)物中心,磷酸三苯酯(Triphenyl phosphate,TPP),純度>92%,德國Dr. Ehrenstorfer GmbH公司);N-丙基乙二胺鍵合固相(PSA)吸附劑、碳18(C18E)吸附劑、石墨化炭黑(GCB)吸附劑均購自美國Supelco公司;丙酮、乙腈、乙酸乙酯、甲醇為色譜純;無水硫酸鎂、氯化鈉、檸檬酸鈉、檸檬酸氫二鈉為分析純。
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