Ultrasensitive colorimetric assay melamine based on in situ reductionto formation of CQDs-silver nanocomposite | |
Department | 中科院西北特色植物资源化学重点实验室/甘肃省天然药物重点实验室 |
Wang WF(王伟峰)1,2; Qiang, Yin2; Meng XH(孟宪华)1; Yang JL(杨军丽)1; Shi YP(师彦平)1; Yang JL(杨军丽) | |
2018 | |
Source Publication | Sensors and Actuators B: Chemical |
ISSN | 0925-4005 |
Volume | 260Issue:0Pages:808-815 |
Abstract | In this work, the in situ reduction of Ag+by carbon quantum dots (CQDs) to the formation of CQDs-silvernanocomposite (CQDs-silver NPs) was exploited to develop a facile and ultrasensitive colorimetric sensorplatform. Due to the high affinity between Ag and melamine, melamine could significantly induce thewell-dispersed CQDs-silver NPs aggregation. Consequently, the solution color of CQDs-silver NPs changedfrom bright yellow to red. Based on this finding, we proposed a new colorimetric method to qualitativelyand quantitatively detect melamine by the naked eyes and UV–vis spectroscopy, respectively. Under theoptimum conditions, the linearity of melamine with the solution absorbance (_R) was plotted in the con-centration range of 1 × 10−10–1 × 10−8g/mL (y = 0.55 + 0.049x, R = 0.9596) and 2.5 × 10−8–5 × 10−7g/mL(y = 3.43 + 0.42x, R = 0.9961). The developed method showed excellent detection sensitivity for melaminewith the detection limit as low as 7.9 × 10−12g/mL (eq. 65.3 pmol L−1). Finally, the developed method wasemployed to detect the amount of melamine in cow milk and milk powderand a recovery of 87.6–116%,and RSD of 1.6–3.9% was achieved. |
Keyword | Ultrasensitive Colorimetric Detection Melamine Cqds-silver Nanocomposite |
Subject Area | 分析化学与药物化学 |
DOI | 10.1016/j.snb.2018.01.108 |
Funding Organization | National Natural Science Foundation of China (No. 81673325 ; 81711540311 ; 21705156) ; the CAS Pioneer Hundred Talents Program |
Indexed By | SCI |
If | 5.667 |
Language | 英语 |
Funding Project | 药物化学成分研究组 |
compositor | 第一作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/22960 |
Collection | 中科院西北特色植物资源化学重点实验室/甘肃省天然药物重点实验室 |
Corresponding Author | Yang JL(杨军丽) |
Affiliation | 1.CAS Key Laboratory of Chemistry of Northwestern Plant Resources, Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of ChemicalPhysics, Chinese Academy of Sciences (CAS), Lanzhou 730000, PR China 2.School of Pharmacy, Lanzhou University, Lanzhou 730000, PR China |
Recommended Citation GB/T 7714 | Wang WF,Qiang, Yin,Meng XH,et al. Ultrasensitive colorimetric assay melamine based on in situ reductionto formation of CQDs-silver nanocomposite[J]. Sensors and Actuators B: Chemical,2018,260(0):808-815. |
APA | Wang WF,Qiang, Yin,Meng XH,Yang JL,Shi YP,&Yang JL.(2018).Ultrasensitive colorimetric assay melamine based on in situ reductionto formation of CQDs-silver nanocomposite.Sensors and Actuators B: Chemical,260(0),808-815. |
MLA | Wang WF,et al."Ultrasensitive colorimetric assay melamine based on in situ reductionto formation of CQDs-silver nanocomposite".Sensors and Actuators B: Chemical 260.0(2018):808-815. |
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