張帆++白珊 王美玲 張瑩 黃志強



摘要建立了分散固相萃取凈化氣相色譜串聯質譜測定茶油中11種有機磷農藥殘留的分析方法.樣品采用乙腈提取,羧基化多壁碳納米管和中性氧化鋁混合吸附劑富集和凈化,能夠有效去除茶油中脂肪等雜質對測定結果的影響.本方法中11種有機磷農藥在0.01~0.5 mg/L范圍內,線性良好,相關系數為0.999 61~0999 96;在0.02~0.1 mg/kg范圍內,11種目標物的回收率為86.2%~112.6%,RSD為3.2%~11.2%.
關鍵詞多壁碳納米管;分散固相萃取;氣相色譜串聯質譜;茶油;有機磷農藥
中圖分類號TS227;O65763文獻標識碼A文章編號10002537(2017)02004907
Determination of 11 Organophosphorus Pesticide Residues in Camellia Oil by
Gas ChromatographyTandem Mass Spectrometry with Dispersive Solidphase
Extraction Using Multiwalled Carbon Nanotubes as Adsorbent
ZHANG Fan1,2 , BAI Shan1, WANG Meiling2, ZHANG Ying2,
HUANG Zhiqiang2*, LI Zhonghai3, ZHONG Haiyan3
(1. Changsha Environmental Protection College, Changsha 410004, China;
2. Hunan Academy of Science and Technology for Inspection and Quarantine, Changsha 410004, China;
3. Faculty of Food Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China)
AbstractAn analytical method has been developed for the determination of 11 organophosphorus pesticide residues in camellia oil by gas chromatographytandem mass spectrometry with dispersive solidphase extraction. The samples were extracted with acetonitrile and purified using carboxylated multiwalled carbon nanotubes and neutral alumina sorbent, which could be used to remove fats and other impurities from the camellia oil that would affect the effectiveness of measurement results. Our results showed that the 11 organophosphorus pesticides had a good linearity in the range of 0.01~0.5 mg/L and the correlation coefficients were between 0.999 61 to 0999 96. The recoveries at spiked levels of 0.02, 0.05, and 0.1 mg/kg for the 11 targets were 86.2%~1126%,with their relative standard deviations in the range of 3.2%~11.2%.
Key wordsmultiwalled carbon nanotubes; dispersive solidphase extraction; GCMS/MS; camellia oil; organophosphorus pesticide
茶油原料來源于我國特有的一種常綠灌木——油茶,其與油棕、油橄欖和椰子各占據了世界上四大木本油料作物一席之位.茶油含有豐富的不飽和脂肪酸和維生素、山茶甙和角鯊烯等生物活性成分,是既具有食用價值又具有藥用價值的高檔植物油,具有廣闊的開發應用前景[1].在油茶的種植過程中,如果沒有進行有效的病蟲害防治,油茶的產量將受到嚴重影響.因此,油茶種植農戶大量使用高效、易降解的有機磷農藥,容易在茶油原料中造成農藥殘留.這些受到有機磷農藥污染的茶油原料加工成茶油后,通過食物鏈長時間作用于人體,器官易發生病變,嚴重時會產生“致畸、致癌、致突變”作用[2].
氣相色譜法[3]、氣相色譜串聯質譜法[4]以及液相色譜串聯質譜法[5]等都是有機磷農藥殘留分析中常用的檢測方法,這些分析方法往往要求有效去除樣品基質中的雜質,從而降低對譜圖的干擾,減少分析結果的誤差.通常使用較多的前處理手段有固相萃取[6]、凝膠滲透色譜[7]、分散固相萃取[89],近年來,分散固相萃取憑借其快速、操作簡單、成本低廉等優勢在農藥殘留分析中受到歡迎.
多壁碳納米管(MWCNT)作為一種新型的吸附劑材料,其超強的吸附能力和超大的吸附容量使得MWCNT在食品農藥殘留的前處理中運用廣泛[1012].本研究考慮到茶油基質凈化的難度,選用多壁碳納米管和中性氧化鋁的混合物作為吸附劑,替代傳統的分散固相萃取的吸附劑,能夠更有效地去除茶油中的大量脂肪和有機酸等大分子干擾雜質,建立一種快速、準確、經濟的茶油中11種有機磷農藥殘留的分析方法.