Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots

CORC > 烟台海岸带研究所 > 中国科学院烟台海岸带研究所 > 中科院海岸带环境过程与生态修复重点实验室

	Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots
	Xu, Lizhou 1; Xu, Xiahong 1; Xiong, Hua 2; Chen, Lingxin3 ; Li, Yanbin 1,4
刊名	SENSORS AND ACTUATORS B-CHEMICAL
	2014-11-01
卷号	203 页码:697-704
关键词	Fluorescence quenching Oil adulteration Vegetable oils Used oils CdSe/ZnS CTAB
ISSN号	0925-4005
通讯作者	Li, YB (reprint author), Zhejiang Univ, C523 Nong Sheng Huan Bldg,Zijingang Campus,866 Y, Hangzhou 310058, Zhejiang, Peoples R China. yanbinli@zju.edu.cn
产权排序	[Xu, Lizhou; Xu, Xiahong; Li, Yanbin] Zhejiang Univ, Coll Biosyst Engn & Food Sci, Hangzhou 310058, Zhejiang, Peoples R China; [Xiong, Hua] Nanchang Univ, State Key Lab Food Sci & Technol, Nanchang 330047, Peoples R China; [Chen, Lingxin] Chinese Acad Sci, Yantai Inst Coastal Zone Res, Shandong Prov Key Lab Coastal Zone Environm Proc, Key Lab Coastal Zone Environm Proc, Yantai 264003, Peoples R China; [Li, Yanbin] Univ Arkansas, Dept Biol & Agr Engn, Fayetteville, AR 72701 USA
中文摘要	Vegetable cooking oils adulterated with inedible used oils or impure oils have posed a severe food safety problem. Current detection methods cannot meet the needs for rapid detection of adulterated oils on line or in field. Therefore, the objective of this research was to develop a rapid optical sensing method based on fluorescence quenching of CdSe/ZnS quantum dots (QDs) for identification of adulterated vegetable cooking oils. High quality hydrophilic photoluminescent nanoparticles were synthesized by encapsulating hydrophobic QDs into the micellar structure of an amphiphilic surfactant cetyltrimethyl ammonium bromide (CTAB) via phase transfer method. TEM, AFM, and fluorescence spectroscopy were used to characterize the prepared CTAB-coated QDs. Oil samples were first captured into the core of the two-layer-structural micelle and then the fluorescence of CTAB-coated QDs, working as fluorescence probes, was selectively quenched by components of the adulterated oils. Heavy metal ions and free radicals were presumed to be main quenchers. After quenching for 1 min, fluorescence intensity was measured and converted to quenching percentage to determine the adulteration concentration. The results showed that in comparison with oil-soluble QDs, water-soluble CTAB-coated QDs had a greater ability to identify oil adulteration. A good quantitative relationship between quenching percentage and adulteration concentration (y = 5.96x + 14.99; R-2 =0.94) was obtained. The sensitive, simple and low-cost sensing method did not require sample pretreatment and could detect refined used oils at 0.4% or higher concentrations in soybean oil within 2 min, showing great potentials for rapid screening of used oils and quantitative analysis of used oil adulteration in field. (C) 2014 Elsevier B.V. All rights reserved.
英文摘要	Vegetable cooking oils adulterated with inedible used oils or impure oils have posed a severe food safety problem. Current detection methods cannot meet the needs for rapid detection of adulterated oils on line or in field. Therefore, the objective of this research was to develop a rapid optical sensing method based on fluorescence quenching of CdSe/ZnS quantum dots (QDs) for identification of adulterated vegetable cooking oils. High quality hydrophilic photoluminescent nanoparticles were synthesized by encapsulating hydrophobic QDs into the micellar structure of an amphiphilic surfactant cetyltrimethyl ammonium bromide (CTAB) via phase transfer method. TEM, AFM, and fluorescence spectroscopy were used to characterize the prepared CTAB-coated QDs. Oil samples were first captured into the core of the two-layer-structural micelle and then the fluorescence of CTAB-coated QDs, working as fluorescence probes, was selectively quenched by components of the adulterated oils. Heavy metal ions and free radicals were presumed to be main quenchers. After quenching for 1 min, fluorescence intensity was measured and converted to quenching percentage to determine the adulteration concentration. The results showed that in comparison with oil-soluble QDs, water-soluble CTAB-coated QDs had a greater ability to identify oil adulteration. A good quantitative relationship between quenching percentage and adulteration concentration (y = 5.96x + 14.99; R-2 =0.94) was obtained. The sensitive, simple and low-cost sensing method did not require sample pretreatment and could detect refined used oils at 0.4% or higher concentrations in soybean oil within 2 min, showing great potentials for rapid screening of used oils and quantitative analysis of used oil adulteration in field. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation
研究领域[WOS]	Chemistry ; Electrochemistry ; Instruments & Instrumentation
关键词[WOS]	OPTICAL-PROPERTIES ; MASS-SPECTROMETRY ; FOOD ANALYSIS ; QUANTIFICATION ; WATER ; SPECTROSCOPY ; PROBE ; CORE ; CHROMATOGRAPHY ; NANOPARTICLES
收录类别	SCI
语种	英语
WOS记录号	WOS:000341455400092
内容类型	期刊论文
源URL	[http://ir.yic.ac.cn/handle/133337/8699]
专题	烟台海岸带研究所_中科院海岸带环境过程与生态修复重点实验室
作者单位	1.Zhejiang Univ, Coll Biosyst Engn & Food Sci, Hangzhou 310058, Zhejiang, Peoples R China 2.Nanchang Univ, State Key Lab Food Sci & Technol, Nanchang 330047, Peoples R China 3.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Shandong Prov Key Lab Coastal Zone Environm Proc, Key Lab Coastal Zone Environm Proc, Yantai 264003, Peoples R China 4.Univ Arkansas, Dept Biol & Agr Engn, Fayetteville, AR 72701 USA
推荐引用方式 GB/T 7714	Xu, Lizhou,Xu, Xiahong,Xiong, Hua,et al. Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots[J]. SENSORS AND ACTUATORS B-CHEMICAL,2014,203:697-704.
APA	Xu, Lizhou,Xu, Xiahong,Xiong, Hua,Chen, Lingxin,&Li, Yanbin.(2014).Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots.SENSORS AND ACTUATORS B-CHEMICAL,203,697-704.
MLA	Xu, Lizhou,et al."Rapid detection of vegetable cooking oils adulterated with inedible used oil using fluorescence quenching method with aqueous CTAB-coated quantum dots".SENSORS AND ACTUATORS B-CHEMICAL 203(2014):697-704.