張帆++白珊 王美玲 張瑩 黃志強(qiáng)
摘要建立了分散固相萃取凈化氣相色譜串聯(lián)質(zhì)譜測定茶油中11種有機(jī)磷農(nóng)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(zhì)對(duì)測定結(jié)果的影響.本方法中11種有機(jī)磷農(nóng)藥在0.01~0.5 mg/L范圍內(nèi),線性良好,相關(guān)系數(shù)為0.999 61~0999 96;在0.02~0.1 mg/kg范圍內(nèi),11種目標(biāo)物的回收率為86.2%~112.6%,RSD為3.2%~11.2%.
關(guān)鍵詞多壁碳納米管;分散固相萃取;氣相色譜串聯(lián)質(zhì)譜;茶油;有機(jī)磷農(nóng)藥
中圖分類號(hào)TS227;O65763文獻(xiàn)標(biāo)識(shí)碼A文章編號(hào)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(jù)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(jià)值又具有藥用價(jià)值的高檔植物油,具有廣闊的開發(fā)應(yīng)用前景[1].在油茶的種植過程中,如果沒有進(jìn)行有效的病蟲害防治,油茶的產(chǎn)量將受到嚴(yán)重影響.因此,油茶種植農(nóng)戶大量使用高效、易降解的有機(jī)磷農(nóng)藥,容易在茶油原料中造成農(nóng)藥殘留.這些受到有機(jī)磷農(nóng)藥污染的茶油原料加工成茶油后,通過食物鏈長時(shí)間作用于人體,器官易發(fā)生病變,嚴(yán)重時(shí)會(huì)產(chǎn)生“致畸、致癌、致突變”作用[2].
氣相色譜法[3]、氣相色譜串聯(lián)質(zhì)譜法[4]以及液相色譜串聯(lián)質(zhì)譜法[5]等都是有機(jī)磷農(nóng)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(zhì)中的雜質(zhì),從而降低對(duì)譜圖的干擾,減少分析結(jié)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(yōu)勢在農(nóng)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(qiáng)的吸附能力和超大的吸附容量使得MWCNT在食品農(nóng)藥殘留的前處理中運(yùn)用廣泛[1012].本研究考慮到茶油基質(zhì)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(tǒng)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(jī)酸等大分子干擾雜質(zhì),建立一種快速、準(zhǔn)確、經(jīng)濟(jì)的茶油中11種有機(jī)磷農(nóng)藥殘留的分析方法.