采用纳米磁珠固液萃取的技术实现对传统和有机蔬菜中拟除虫菊酯农药的检测.pdf
《采用纳米磁珠固液萃取的技术实现对传统和有机蔬菜中拟除虫菊酯农药的检测.pdf》由会员分享,可在线阅读,更多相关《采用纳米磁珠固液萃取的技术实现对传统和有机蔬菜中拟除虫菊酯农药的检测.pdf(8页珍藏版)》请在咨信网上搜索。
1、Analytical MethodsPyrethroid residue determination in organic and conventionalvegetables using liquid-solid extraction coupled with magnetic solidphase extraction based on polystyrene-coated magnetic nanoparticlesXi Yu,Hongshun YangFood Science and Technology Programme,c/o Department of Chemistry,Na
2、tional University of Singapore,117543 Singapore,SingaporeNational University of Singapore(Suzhou)Research Institute,377 Lin Quan Street,Suzhou Industrial Park,Suzhou,Jiangsu 215123,PR Chinaa r t i c l ei n f oArticle history:Received 26 September 2015Received in revised form 24 May 2016Accepted 27 A
3、ugust 2016Available online 29 August 2016Keywords:VegetablesOrganicNanoparticlesHPLCPyrethroidsExtraction techniquea b s t r a c tA detection method using polystyrene-coated magnetic nanoparticles based extraction technique cou-pled to HPLC was developed for trace amount of pyrethroids residue detec
4、tion in vegetable matrixes.The recoveries for five kinds of commonly used pyrethroids were in the range of 91.6%116.2%.Thesensitivity and precision of the method were satisfactory with the limits of detection and limits of quan-tification in the range of 0.02000.0392 ng g?1and 0.0720.128 ng g?1,resp
5、ectively.The intra-day andinter-day relative standard deviations for the recoveries of the analytes were lower than 6.8%and10.7%,respectively.The nanoparticles can be washed and recycled after use.The results indicate thatthe developed method was efficient,fast,economical and environmentally friendl
6、y.The method wassuccessfully applied to detect the pyrethroids residue in ten pairs of commonly consumed organic andconventional fresh vegetables in Singapore.Pyrethroids residue was detected in four kinds of conven-tional vegetables and one kind of organic vegetable.?2016 Elsevier Ltd.All rights re
7、served.1.IntroductionVegetables are a very important category of food materials dueto their high contents of dietary fiber,vitamins,antioxidants,min-erals and diverse beneficial phytochemicals(Demmig-Adams&Adams,2002;Ren et al.,2014).Regular consumption of vegetablesbrings great health beneficial ef
8、fect for human beings by enhancinghuman immunity and preventing diseases such as diabetes,consti-pation,cardiovascular diseases,and even colon cancer(Fu et al.,2015;Murphy et al.,2012;Ren,Perera,&Hemar,2012).However,pesticides residue in vegetables,especially leafy vegetables hasbeen a concern due t
9、o the high reliance on the synthetic pesticidesin order to boost crop yields(Wilkowska&Biziuk,2011).Longterm over dose exposure to synthetic pesticides can lead to severehealth problems since most of these chemicals are teratogenetic oreven carcinogenic(Walorczyk et al.,2013).Even worse,theyusually
10、cannot be metabolised thoroughly in short term in humanbody and will thus be accumulated in the form of prototype ormetabolite to a dangerous level(Bhn et al.,2014).Pyrethroids are widely applied synthetic pesticides derivedfromnaturallyoccurredchrysanthemumesters(Radford,Panuwet,Hunter,Barr,&Ryan,2
11、014).Although pyrethroids aremainly applied to crops,they can be accumulated in soil andspread to every link of food production and every part of our dailydiet via contamination(Bayen,Zhang,Desai,Ooi,&Kelly,2013;Farajzadeh,Khoshmaram,&Nabil,2014;Yu,Sun,Jiang,Gaoet al.,2012).Moreover,according to vas
12、t research,the contamina-tion of pyrethroids can diffuse to the environment through watercirculation such as irrigation and rainfall(Bayen,Yi,Segovia,Zhou,&Kelly,2014;Bayen et al.,2014;Fernndez-Ramos,atnsky,&Solich,2014).Therefore,it is important to develop accurateand effective technique to detect
13、pyrethroids residue in variousmatrixes,especially vegetables(Zhu et al.,2014).Many efforts have been paid to determine pyrethroids in foodmatrixes since they started to be widely used(Ling&Huang,1995;Watanabe&Baba,2015).Due to the complexity of the foodmatrixes,in the determination the most affectiv
14、e step is the pre-concentration since it is decisive in achieving high accuracy andlow limit of detection(Bidari,Ganjali,Norouzi,Hosseini,&Assadi,2011).Acompetitiveenzyme-linkedimmunosorbentmethod was developed to extract pyrethroids residue from lettuceand peach(Park et al.,2004)then a clean-up rou
15、tine using solidphase extraction cartridges to facilitate analysis of pyrethroidshttp:/dx.doi.org/10.1016/j.foodchem.2016.08.1150308-8146/?2016 Elsevier Ltd.All rights reserved.Corresponding author at:Food Science and Technology Programme,c/oDepartment of Chemistry,National University of Singapore,3
16、 Science Drive 3,117543 Singapore,Singapore.E-mail address:chmynghsnus.edu.sg(H.Yang).Food Chemistry 217(2017)303310Contents lists available at ScienceDirectFood Chemistryjournal homepage: in grape,orange,tomato,carrot and green mustard wasdeveloped(Sharif,Man,Hamid,&Keat,2006).However,all thesetrad
17、itional methods had limitations including long operation hourswith multi steps,high cost and large consumption of organic sol-vent,which make them hard to be used on a large scale for batchdetection(Bayen,2012;Zainudin,Salleh,Mohamed,Yap,&Muhamad,2015).Most recently,magnetic solid phase extraction(M
18、SPE)has drawn much attention due to its unique advantagesof high efficiency,low cost and environmental friendliness(Caoet al.,2012).With the introduction of magnetic adsorbents,sometedious filtration and centrifugation steps are not needed(Weiet al.,2013).In addition,various coatings of different af
19、finities onthe magnetic core for targeted analytes greatly improved the selec-tivity of the extraction and enhanced signal-to-noise ratio whileanalysing complex samples(Yu,Sun,Jiang,Sun et al.,2012).Recently,nanoparticles were applied for pyrethroids extractionfrom tea drinks and other beverages(Wan
20、g,Sun,Gao et al.,2014;Zhao,Lu,&Feng,2013).Although these recent methods haveadvantages,they are mostly confined to liquid samples(Jiang et al.,2014;Wang,Sun,Xu,et al.,2014).There is a need to broaden theapplicability of magnetic solid phase extraction thus it can be usedfor detecting pesticides resi
21、due in vegetables,where pesticideswere most accumulated(Xie,Guo,Zhang,&Shi,2014).In the present work,we successfully developed polystyrene-coatedmagneticnanoparticles(PSt/MNPs)basedextractiontechnique for the preconcentration of trace amount of pyrethroidsresidue in vegetable matrixes.In this method
22、,magnetic solid phaseextraction was coupled to solidliquid phase extraction for thehigh efficiency preconcentration of pyrethroids residue in vegeta-bles.The polystyrene coating of the MNPs showed strong affinityforbeta-cyhalothrin,bifenthrin,fenvalerate,permethrinanddecamethrin,which was inspired b
23、y the unique separating powerfor conjugated compounds of chromatographic columns withpolystyrene as functional groups of packing material.The presentmethod was proved to be highly efficient,fast,low cost andenvironmentally friendly for the detection of trace amount ofpyrethroids residue in various v
24、egetable matrixes.2.Materials and methods2.1.Organic and conventional vegetable samplesTenpairsoforganicandconventionalvegetableswerepurchased from local supermarkets in Singapore,which includedcabbage(Brassica oleraceacapitata),pakchoi(Brassica rapachinensis),Chinese kale(Brassica oleraceaalboglabr
25、a),rape(Brassica napus),Chinese chive(Allium schoenoprasum),lettuce(Lactuca sativa),amaranth(Amaranthuscruentus),broccoli(Brassica aleraceaitalica),cauliflower(Brassicaoleraceabotrytis)andChinesecabbage(Brassica rapapekinensis).One batch of organic Chinese cabbagewas checked to be free of any target
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